优化读写逻辑

README.md

@@ -15,8 +15,8 @@
 # JAVA解析Excel工具easyexcel
 Java解析、生成Excel比较有名的框架有Apache poi、jxl。但他们都存在一个严重的问题就是非常的耗内存，poi有一套SAX模式的API可以一定程度的解决一些内存溢出的问题，但POI还是有一些缺陷，比如07版Excel解压缩以及解压后存储都是在内存中完成的，内存消耗依然很大。easyexcel重写了poi对07版Excel的解析，能够原本一个3M的excel用POI sax依然需要100M左右内存降低到几M，并且再大的excel不会出现内存溢出，03版依赖POI的sax模式。在上层做了模型转换的封装，让使用者更加简单方便
 ## 相关文档
-* [关于软件](/abouteasyexcel.md)
 * [快速使用](/quickstart.md)
+* [关于软件](/abouteasyexcel.md)
 * [常见问题](/problem.md)
 * [更新记事](/update.md)
 * [English-README](/easyexcel_en.md)
@@ -74,7 +74,7 @@ DEMO代码地址：[https://github.com/alibaba/easyexcel/blob/master/src/test/ja
      * 文件下载
      * <li>1. 创建excel对应的实体对象 参照{@link DownloadData}
      * <li>2. 设置返回的 参数
-     * <li>3. 直接写，这里注意，finish的时候会自动关闭OutputStream,当然你外面再关闭异常问题不大
+     * <li>3. 直接写，这里注意，finish的时候会自动关闭OutputStream,当然你外面再关闭流问题不大
      */
     @GetMapping("download")
     public void download(HttpServletResponse response) throws IOException {

quickstart.md

@@ -1,4 +1,10 @@
 # easyexcel核心功能
+## 目录
+### 读
+DEMO代码地址：[https://github.com/alibaba/easyexcel/blob/master/src/test/java/com/alibaba/easyexcel/demo/read/ReadTest.java](/src/test/java/com/alibaba/easyexcel/test/demo/read/ReadTest.java)
+* [最简单的读](#simpleRead)
+
+### 写
 
 ## *读任意大小的03、07版Excel不会OO]<br />
 ## *读Excel自动通过注解，把结果映射为java模型<br />
@@ -12,343 +18,304 @@
 ## *写Excel时一个sheet可以写多个Table<br />
 ## *写Excel时候自定义是否需要写表头<br />
 
-## 读Excel
-
-使用easyexcel解析03、07版本的Excel只是ExcelTypeEnum不同，其他使用完全相同，使用者无需知道底层解析的差异。
-
-### 无java模型直接把excel解析的每行结果以List&lt;String&gt;返回 在ExcelListener获取解析结果
 
-读excel代码示例如下：
+## 读excel样例
+### 最简单的读<span id="simpleRead" />
+#### excel示例<span id="simpleReadExcel" />
+![img](img/readme/quickstart/read/demo.png)
+#### 对象<span id="simpleReadObject" />
+```java
+@Data
+public class DemoData {
+    private String string;
+    private Date date;
+    private Double doubleData;
+}
 ```
-    @Test
+#### 监听器<span id="simpleReadListener" />
-    public void testExcel2003NoModel() {
+```java
-        InputStream inputStream = getInputStream("loan1.xls");
+public class DemoDataListener extends AnalysisEventListener<DemoData> {
-        try {
+    private static final Logger LOGGER = LoggerFactory.getLogger(DemoDataListener.class);
-            // 解析每行结果在listener中处理
+    /**
-            ExcelListener listener = new ExcelListener();
+     * 每隔5条存储数据库，实际使用中可以3000条，然后清理list ，方便内存回收
-
+     */
-            ExcelReader excelReader = new ExcelReader(inputStream, ExcelTypeEnum.XLS, null, listener);
+    private static final int BATCH_COUNT = 5;
-            excelReader.read();
+    List<DemoData> list = new ArrayList<DemoData>();
-        } catch (Exception e) {
+
-
+    @Override
-        } finally {
+    public void invoke(DemoData data, AnalysisContext context) {
-            try {
+        LOGGER.info("解析到一条数据:{}", JSON.toJSONString(data));
-                inputStream.close();
+        list.add(data);
-            } catch (IOException e) {
+        if (list.size() >= BATCH_COUNT) {
-                e.printStackTrace();
+            saveData();
-            }
+            list.clear();
         }
     }
-```
-ExcelListener示例代码如下：
-```
- /* 解析监听器，
- * 每解析一行会回调invoke()方法。
- * 整个excel解析结束会执行doAfterAllAnalysed()方法
- *
- * 下面只是我写的一个样例而已，可以根据自己的逻辑修改该类。
- * @author jipengfei
- * @date 2017/03/14
- */
-public class ExcelListener extends AnalysisEventListener {
 
-    //自定义用于暂时存储data。
+    @Override
-    //可以通过实例获取该值
-    private List<Object> datas = new ArrayList<Object>();
-    public void invoke(Object object, AnalysisContext context) {
-        System.out.println("当前行："+context.getCurrentRowNum());
-        System.out.println(object);
-        datas.add(object);//数据存储到list，供批量处理，或后续自己业务逻辑处理。
-        doSomething(object);//根据自己业务做处理
-    }
-    private void doSomething(Object object) {
-        //1、入库调用接口
-    }
     public void doAfterAllAnalysed(AnalysisContext context) {
-       // datas.clear();//解析结束销毁不用的资源
+        saveData();
-    }
+        LOGGER.info("所有数据解析完成！");
-    public List<Object> getDatas() {
-        return datas;
     }
-    public void setDatas(List<Object> datas) {
+
-        this.datas = datas;
+    /**
+     * 加上存储数据库
+     */
+    private void saveData() {
+        LOGGER.info("{}条数据，开始存储数据库！", list.size());
+        LOGGER.info("存储数据库成功！");
     }
 }
 ```
-### 有java模型映射 
+#### 代码
-java模型写法如下：
+```java
+    /**
+     * 最简单的读
+     * <li>1. 创建excel对应的实体对象 参照{@link DemoData}
+     * <li>2. 由于默认异步读取excel，所以需要创建excel一行一行的回调监听器，参照{@link DemoDataListener}
+     * <li>3. 直接读即可
+     */
+    @Test
+    public void simpleRead() {
+        // 写法1：
+        String fileName = TestFileUtil.getPath() + "demo" + File.separator + "demo.xlsx";
+        // 这里 需要指定读用哪个class去读，然后读取第一个sheet 文件流会自动关闭
+        EasyExcelFactory.read(fileName, DemoData.class, new DemoDataListener()).sheet().doRead();
+
+        // 写法2：
+        fileName = TestFileUtil.getPath() + "demo" + File.separator + "demo.xlsx";
+        ExcelReader excelReader = EasyExcelFactory.read(fileName, DemoData.class, new DemoDataListener()).build();
+        ReadSheet readSheet = EasyExcelFactory.readSheet(0).build();
+        excelReader.read(readSheet);
+        // 这里千万别忘记关闭，读的时候会创建临时文件，到时磁盘会崩的
+        excelReader.finish();
+    }
 ```
-public class LoanInfo extends BaseRowModel {
-    @ExcelProperty(index = 0)
-    private String bankLoanId;
-    
-    @ExcelProperty(index = 1)
-    private Long customerId;
-    
-    @ExcelProperty(index = 2,format = "yyyy/MM/dd")
-    private Date loanDate;
-    
-    @ExcelProperty(index = 3)
-    private BigDecimal quota;
-    
-    @ExcelProperty(index = 4)
-    private String bankInterestRate;
-    
-    @ExcelProperty(index = 5)
-    private Integer loanTerm;
-    
-    @ExcelProperty(index = 6,format = "yyyy/MM/dd")
-    private Date loanEndDate;
-    
-    @ExcelProperty(index = 7)
-    private BigDecimal interestPerMonth;
 
-    @ExcelProperty(value = {"一级表头","二级表头"})
+### 指定列的下标或者列名<span id="indexOrNameRead" />
-    private BigDecimal sax;
+#### excel示例
+参照：[excel示例](#simpleReadExcel)
+#### 对象
+```java
+@Data
+public class IndexOrNameData {
+    /**
+     * 强制读取第三个 这里不建议 index 和 name 同时用，要么一个对象只用index，要么一个对象只用name去匹配
+     */
+    @ExcelProperty(index = 2)
+    private Double doubleData;
+    /**
+     * 用名字去匹配，这里需要注意，如果名字重复，会导致只有一个字段读取到数据
+     */
+    @ExcelProperty("字符串标题")
+    private String string;
+    @ExcelProperty("日期标题")
+    private Date date;
 }
 ```
-@ExcelProperty(index = 3)数字代表该字段与excel对应列号做映射，也可以采用 @ExcelProperty(value = {"一级表头","二级表头"})用于解决不确切知道excel第几列和该字段映射，位置不固定，但表头的内容知道的情况。
+#### 监听器
-```
+参照：[监听器](#simpleReadListener) 只是泛型变了而已
+#### 代码
+```java
+    /**
+     * 指定列的下标或者列名
+     *
+     * <li>1. 创建excel对应的实体对象,并使用{@link ExcelProperty}注解. 参照{@link IndexOrNameData}
+     * <li>2. 由于默认异步读取excel，所以需要创建excel一行一行的回调监听器，参照{@link IndexOrNameDataListener}
+     * <li>3. 直接读即可
+     */
     @Test
-    public void testExcel2003WithReflectModel() {
+    public void indexOrNameRead() {
-        InputStream inputStream = getInputStream("loan1.xls");
+        String fileName = TestFileUtil.getPath() + "demo" + File.separator + "demo.xlsx";
-        try {
+        // 这里默认读取第一个sheet
-            // 解析每行结果在listener中处理
+        EasyExcelFactory.read(fileName, IndexOrNameData.class, new IndexOrNameDataListener()).sheet().doRead();
-            AnalysisEventListener listener = new ExcelListener();
-
-            ExcelReader excelReader = new ExcelReader(inputStream, ExcelTypeEnum.XLS, null, listener);
-
-            excelReader.read(new Sheet(1, 2, LoanInfo.class));
-        } catch (Exception e) {
-
-        } finally {
-            try {
-                inputStream.close();
-            } catch (IOException e) {
-                e.printStackTrace();
-            }
-        }
-
     }
 ```
-带模型解析与不带模型解析主要在构造new Sheet(1, 2, LoanInfo.class)时候包含class。Class需要继承BaseRowModel暂时BaseRowModel没有任何内容，后面升级可能会增加一些默认的数据。
-
-## 写Excel
-
-### 每行数据是List&lt;String&gt;无表头
-
-```
-  OutputStream out = new FileOutputStream("/Users/jipengfei/77.xlsx");
-        try {
-            ExcelWriter writer = new ExcelWriter(out, ExcelTypeEnum.XLSX,false);
-            //写第一个sheet, sheet1  数据全是List<String> 无模型映射关系
-            Sheet sheet1 = new Sheet(1, 0);
-            sheet1.setSheetName("第一个sheet");
-            writer.write(getListString(), sheet1);
-            writer.finish();
-        } catch (Exception e) {
-            e.printStackTrace();
-        } finally {
-            try {
-                out.close();
-            } catch (IOException e) {
-                e.printStackTrace();
-            }
-        }
-```
 
-### 每行数据是一个java模型有表头----表头层级为一
+### 读多个sheet<span id="repeatedRead" />
-
+#### excel示例
-生成Excel格式如下图
+参照：[excel示例](#simpleReadExcel)
-![屏幕快照 2017-06-02 上午9.49.39.png](http://ata2-img.cn-hangzhou.img-pub.aliyun-inc.com/dfcb44d05380e2e26bce93f850d9fc99.png)
+#### 对象
-
+参照：[对象](#simpleReadObject)
-模型写法如下：
+#### 监听器
+参照：[监听器](#simpleReadListener)
+#### 代码
+```java
+    /**
+     * 读多个sheet,这里注意一个sheet不能读取多次，一定要多次需要重新读取文件
+     * <li>1. 创建excel对应的实体对象 参照{@link DemoData}
+     * <li>2. 由于默认异步读取excel，所以需要创建excel一行一行的回调监听器，参照{@link DemoDataListener}
+     * <li>3. 直接读即可
+     */
+    @Test
+    public void repeatedRead() {
+        String fileName = TestFileUtil.getPath() + "demo" + File.separator + "demo.xlsx";
+        ExcelReader excelReader = EasyExcelFactory.read(fileName, DemoData.class, new DemoDataListener()).build();
+        ReadSheet readSheet1 = EasyExcelFactory.readSheet(0).build();
+        ReadSheet readSheet2 = EasyExcelFactory.readSheet(1).build();
+        excelReader.read(readSheet1);
+        excelReader.read(readSheet2);
+        // 这里千万别忘记关闭，读的时候会创建临时文件，到时磁盘会崩的
+        excelReader.finish();
+    }
 ```
-public class ExcelPropertyIndexModel extends BaseRowModel {
-
-    @ExcelProperty(value = "姓名" ,index = 0)
-    private String name;
-
-    @ExcelProperty(value = "年龄",index = 1)
-    private String age;
-
-    @ExcelProperty(value = "邮箱",index = 2)
-    private String email;
-
-    @ExcelProperty(value = "地址",index = 3)
-    private String address;
 
-    @ExcelProperty(value = "性别",index = 4)
+### 日期、数字或者自定义格式转换<span id="converterRead" />
-    private String sax;
+#### excel示例
-
+参照：[excel示例](#simpleReadExcel)
-    @ExcelProperty(value = "高度",index = 5)
+#### 对象
-    private String heigh;
+```java
-
+@Data
-    @ExcelProperty(value = "备注",index = 6)
+public class ConverterData {
-    private String last;
+    /**
+     * 我自定义 转换器，不管数据库传过来什么 。我给他加上“自定义：”
+     */
+    @ExcelProperty(converter = CustomStringStringConverter.class)
+    private String string;
+    /**
+     * 这里用string 去接日期才能格式化。我想接收年月日格式
+     */
+    @DateTimeFormat("yyyy年MM月dd日HH时mm分ss秒")
+    private String date;
+    /**
+     * 我想接收百分比的数字
+     */
+    @NumberFormat("#.##%")
+    private String doubleData;
 }
 ```
-   @ExcelProperty(value = "姓名",index = 0) value是表头数据，默认会写在excel的表头位置，index代表第几列。
+#### 监听器
-```
+参照：[监听器](#simpleReadListener) 只是泛型变了
- @Test
+#### 自定义转换器
-    public void test1() throws FileNotFoundException {
+````java
-        OutputStream out = new FileOutputStream("/Users/jipengfei/78.xlsx");
+public class CustomStringStringConverter implements Converter<String> {
-        try {
+    @Override
-            ExcelWriter writer = new ExcelWriter(out, ExcelTypeEnum.XLSX);
+    public Class supportJavaTypeKey() {
-            //写第一个sheet, sheet1  数据全是List<String> 无模型映射关系
+        return String.class;
-            Sheet sheet1 = new Sheet(1, 0,ExcelPropertyIndexModel.class);
-            writer.write(getData(), sheet1);
-            writer.finish();
-        } catch (Exception e) {
-            e.printStackTrace();
-        } finally {
-            try {
-                out.close();
-            } catch (IOException e) {
-                e.printStackTrace();
-            }
-        }
     }
-```
-
-### 每行数据是一个java模型有表头----表头层级为多层级
-
-生成Excel格式如下图：
-![屏幕快照 2017-06-02 上午9.53.07.png](http://ata2-img.cn-hangzhou.img-pub.aliyun-inc.com/0cdb1673665e7940cd670871afb4b3d7.png)
-java模型写法如下：
-```
-public class MultiLineHeadExcelModel extends BaseRowModel {
-
-    @ExcelProperty(value = {"表头1","表头1","表头31"},index = 0)
-    private String p1;
 
-    @ExcelProperty(value = {"表头1","表头1","表头32"},index = 1)
+    @Override
-    private String p2;
+    public CellDataTypeEnum supportExcelTypeKey() {
-
+        return CellDataTypeEnum.STRING;
-    @ExcelProperty(value = {"表头3","表头3","表头3"},index = 2)
+    }
-    private int p3;
-
-    @ExcelProperty(value = {"表头4","表头4","表头4"},index = 3)
-    private long p4;
-
-    @ExcelProperty(value = {"表头5","表头51","表头52"},index = 4)
-    private String p5;
-
-    @ExcelProperty(value = {"表头6","表头61","表头611"},index = 5)
-    private String p6;
 
-    @ExcelProperty(value = {"表头6","表头61","表头612"},index = 6)
+    /**
-    private String p7;
+     * 这里读的时候会调用
+     *
+     * @param cellData
+     *            NotNull
+     * @param contentProperty
+     *            Nullable
+     * @param globalConfiguration
+     *            NotNull
+     * @return
+     */
+    @Override
+    public String convertToJavaData(CellData cellData, ExcelContentProperty contentProperty,
+        GlobalConfiguration globalConfiguration) {
+        return "自定义：" + cellData.getStringValue();
+    }
 
-    @ExcelProperty(value = {"表头6","表头62","表头621"},index = 7)
+    /**
-    private String p8;
+     * 这里是写的时候会调用 不用管
+     *
+     * @param value
+     *            NotNull
+     * @param contentProperty
+     *            Nullable
+     * @param globalConfiguration
+     *            NotNull
+     * @return
+     */
+    @Override
+    public CellData convertToExcelData(String value, ExcelContentProperty contentProperty,
+        GlobalConfiguration globalConfiguration) {
+        return new CellData(value);
+    }
 
-    @ExcelProperty(value = {"表头6","表头62","表头622"},index = 8)
-    private String p9;
 }
-```
+````
-写Excel写法同上，只需将ExcelPropertyIndexModel.class改为MultiLineHeadExcelModel.class
+#### 代码
-
+```java
-
+    /**
-### 一个Excel多个sheet写法
+     * 日期、数字或者自定义格式转换
-
+     * <p>
-```
+     * 默认读的转换器{@link DefaultConverterLoader#loadDefaultReadConverter()}
- @Test
+     * <li>1. 创建excel对应的实体对象 参照{@link ConverterData}.里面可以使用注解{@link DateTimeFormat}、{@link NumberFormat}或者自定义注解
-    public void test1() throws FileNotFoundException {
+     * <li>2. 由于默认异步读取excel，所以需要创建excel一行一行的回调监听器，参照{@link ConverterDataListener}
-
+     * <li>3. 直接读即可
-        OutputStream out = new FileOutputStream("/Users/jipengfei/77.xlsx");
+     */
-        try {
+    @Test
-            ExcelWriter writer = new ExcelWriter(out, ExcelTypeEnum.XLSX,false);
+    public void converterRead() {
-            //写第一个sheet, sheet1  数据全是List<String> 无模型映射关系
+        String fileName = TestFileUtil.getPath() + "demo" + File.separator + "demo.xlsx";
-            Sheet sheet1 = new Sheet(1, 0);
+        // 这里 需要指定读用哪个class去读，然后读取第一个sheet 然后千万别忘记 finish
-            sheet1.setSheetName("第一个sheet");
+        EasyExcelFactory.read(fileName, ConverterData.class, new ConverterDataListener())
-            writer.write(getListString(), sheet1);
+            // 这里注意 我们也可以registerConverter来指定自定义转换器， 但是这个转换变成全局了， 所有java为string,excel为string的都会用这个转换器。
-
+            // 如果就想单个字段使用请使用@ExcelProperty 指定converter
-            //写第二个sheet sheet2  模型上打有表头的注解，合并单元格
+            // .registerConverter(new CustomStringStringConverter())
-            Sheet sheet2 = new Sheet(2, 3, MultiLineHeadExcelModel.class, "第二个sheet", null);
+            // 读取sheet
-            sheet2.setTableStyle(getTableStyle1());
+            .sheet().doRead();
-            writer.write(getModeldatas(), sheet2);
-
-            //写sheet3  模型上没有注解，表头数据动态传入
-            List<List<String>> head = new ArrayList<List<String>>();
-            List<String> headCoulumn1 = new ArrayList<String>();
-            List<String> headCoulumn2 = new ArrayList<String>();
-            List<String> headCoulumn3 = new ArrayList<String>();
-            headCoulumn1.add("第一列");
-            headCoulumn2.add("第二列");
-            headCoulumn3.add("第三列");
-            head.add(headCoulumn1);
-            head.add(headCoulumn2);
-            head.add(headCoulumn3);
-            Sheet sheet3 = new Sheet(3, 1, NoAnnModel.class, "第三个sheet", head);
-            writer.write(getNoAnnModels(), sheet3);
-            writer.finish();
-        } catch (Exception e) {
-            e.printStackTrace();
-        } finally {
-            try {
-                out.close();
-            } catch (IOException e) {
-                e.printStackTrace();
-            }
-        }
     }
 ```
 
-### 一个sheet中有多个表格
+### 多行头<span id="complexHeaderRead" />
-
+#### excel示例
+参照：[excel示例](#simpleReadExcel)
+#### 对象
+参照：[对象](#simpleReadObject)
+#### 监听器
+参照：[监听器](#simpleReadListener)
+#### 代码
+```java
+    /**
+     * 多行头
+     *
+     * <li>1. 创建excel对应的实体对象 参照{@link DemoData}
+     * <li>2. 由于默认异步读取excel，所以需要创建excel一行一行的回调监听器，参照{@link DemoDataListener}
+     * <li>3. 设置headRowNumber参数，然后读。 这里要注意headRowNumber如果不指定， 会根据你传入的class的{@link ExcelProperty#value()}里面的表头的数量来决定行数，
+     * 如果不传入class则默认为1.当然你指定了headRowNumber不管是否传入class都是以你传入的为准。
+     */
+    @Test
+    public void complexHeaderRead() {
+        String fileName = TestFileUtil.getPath() + "demo" + File.separator + "demo.xlsx";
+        // 这里 需要指定读用哪个class去读，然后读取第一个sheet 然后千万别忘记 finish
+        EasyExcelFactory.read(fileName, DemoData.class, new DemoDataListener()).sheet()
+            // 这里可以设置1，因为头就是一行。如果多行头，可以设置其他值。不传入也可以，因为默认会根据DemoData 来解析，他没有指定头，也就是默认1行
+            .headRowNumber(1).doRead();
+    }
 ```
-@Test
-    public void test2() throws FileNotFoundException {
-        OutputStream out = new FileOutputStream("/Users/jipengfei/77.xlsx");
-        try {
-            ExcelWriter writer = new ExcelWriter(out, ExcelTypeEnum.XLSX,false);
-
-            //写sheet1  数据全是List<String> 无模型映射关系
-            Sheet sheet1 = new Sheet(1, 0);
-            sheet1.setSheetName("第一个sheet");
-            Table table1 = new Table(1);
-            writer.write(getListString(), sheet1, table1);
-            writer.write(getListString(), sheet1, table1);
-
-            //写sheet2  模型上打有表头的注解
-            Table table2 = new Table(2);
-            table2.setTableStyle(getTableStyle1());
-            table2.setClazz(MultiLineHeadExcelModel.class);
-            writer.write(getModeldatas(), sheet1, table2);
 
-            //写sheet3  模型上没有注解，表头数据动态传入,此情况下模型field顺序与excel现实顺序一致
+### 同步的返回<span id="synchronousRead" />
-            List<List<String>> head = new ArrayList<List<String>>();
+#### excel示例
-            List<String> headCoulumn1 = new ArrayList<String>();
+参照：[excel示例](#simpleReadExcel)
-            List<String> headCoulumn2 = new ArrayList<String>();
+#### 对象
-            List<String> headCoulumn3 = new ArrayList<String>();
+参照：[对象](#simpleReadObject)
-            headCoulumn1.add("第一列");
+#### 代码
-            headCoulumn2.add("第二列");
+```java
-            headCoulumn3.add("第三列");
+    /**
-            head.add(headCoulumn1);
+     * 同步的返回，不推荐使用，如果数据量大会把数据放到内存里面
-            head.add(headCoulumn2);
+     */
-            head.add(headCoulumn3);
+    @Test
-            Table table3 = new Table(3);
+    public void synchronousRead() {
-            table3.setHead(head);
+        String fileName = TestFileUtil.getPath() + "demo" + File.separator + "demo.xlsx";
-            table3.setClazz(NoAnnModel.class);
+        // 这里 需要指定读用哪个class去读，然后读取第一个sheet 同步读取会自动finish
-            table3.setTableStyle(getTableStyle2());
+        List<Object> list = EasyExcelFactory.read(fileName).head(DemoData.class).sheet().doReadSync();
-            writer.write(getNoAnnModels(), sheet1, table3);
+        for (Object obj : list) {
-            writer.write(getNoAnnModels(), sheet1, table3);
+            DemoData data = (DemoData)obj;
+            LOGGER.info("读取到数据:{}", JSON.toJSONString(data));
+        }
 
-            writer.finish();
+        // 这里 也可以不指定class，返回一个list，然后读取第一个sheet 同步读取会自动finish
-        } catch (Exception e) {
+        list = EasyExcelFactory.read(fileName).sheet().doReadSync();
-            e.printStackTrace();
+        for (Object obj : list) {
-        } finally {
+            // 返回每条数据的键值对 表示所在的列 和所在列的值
-            try {
+            Map<Integer, String> data = (Map<Integer, String>)obj;
-                out.close();
+            LOGGER.info("读取到数据:{}", JSON.toJSONString(data));
-            } catch (IOException e) {
-                e.printStackTrace();
-            }
         }
     }
 ```
-## 测试数据分析
 
+## 测试数据分析
 ![POI usermodel PK easyexcel(Excel 2003).png](http://ata2-img.cn-hangzhou.img-pub.aliyun-inc.com/02c4bfbbab99a649788523d04f84a42f.png)
 ![POI usermodel PK easyexcel(Excel 2007).png](http://ata2-img.cn-hangzhou.img-pub.aliyun-inc.com/f6a8a19ec959f0eb564e652de523fc9e.png)
 ![POI usermodel PK easyexcel(Excel 2003) (1).png](http://ata2-img.cn-hangzhou.img-pub.aliyun-inc.com/26888f7ea1cb8dc56db494926544edf7.png)

src/main/java/com/alibaba/excel/context/WriteContextImpl.java

@@ -13,7 +13,6 @@ import org.apache.poi.ss.util.CellRangeAddress;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import com.alibaba.excel.enums.WriteLastRowType;
 import com.alibaba.excel.exception.ExcelGenerateException;
 import com.alibaba.excel.metadata.Head;
 import com.alibaba.excel.util.WorkBookUtil;
@@ -198,18 +197,13 @@ public class WriteContextImpl implements WriteContext {
         if (!currentWriteHolder.needHead() || !currentWriteHolder.excelWriteHeadProperty().hasHead()) {
             return;
         }
-        int lastRowNum = writeSheetHolder.getSheet().getLastRowNum();
+        int newRowIndex = writeSheetHolder.getNewRowIndexAndStartDoWrite();
-        // 'lastRowNum' doesn't matter if it has one or zero,is's zero
+        newRowIndex += currentWriteHolder.relativeHeadRowIndex();
-        if (WriteLastRowType.HAVE_DATA == writeSheetHolder.getWriteLastRowType()) {
-            lastRowNum++;
-        }
-        writeSheetHolder.setWriteLastRowType(WriteLastRowType.HAVE_DATA);
-        int rowIndex = lastRowNum + currentWriteHolder.relativeHeadRowIndex();
         // Combined head
-        addMergedRegionToCurrentSheet(excelWriteHeadProperty, rowIndex);
+        addMergedRegionToCurrentSheet(excelWriteHeadProperty, newRowIndex);
-        for (int relativeRowIndex = 0, i = rowIndex; i < excelWriteHeadProperty.getHeadRowNumber() + rowIndex;
+        for (int relativeRowIndex = 0, i = newRowIndex; i < excelWriteHeadProperty.getHeadRowNumber() + newRowIndex;
             i++, relativeRowIndex++) {
-            beforeRowCreate(rowIndex, relativeRowIndex);
+            beforeRowCreate(newRowIndex, relativeRowIndex);
             Row row = WorkBookUtil.createRow(writeSheetHolder.getSheet(), i);
             afterRowCreate(row, relativeRowIndex);
             addOneRowOfHeadDataToExcel(row, excelWriteHeadProperty.getHeadMap(), relativeRowIndex);

src/main/java/com/alibaba/excel/converters/DefaultConverterLoader.java

@@ -40,28 +40,34 @@ import com.alibaba.excel.converters.string.StringStringConverter;
  * @author Jiaju Zhuang
  */
 public class DefaultConverterLoader {
+    private static Map<String, Converter> defaultWriteConverter;
+    private static Map<String, Converter> allConverter;
+
     /**
      * Load default write converter
      *
      * @return
      */
     public static Map<String, Converter> loadDefaultWriteConverter() {
-        Map<String, Converter> converterMap = new HashMap<String, Converter>(16);
+        if (defaultWriteConverter != null) {
-        putWriteConverter(converterMap, new BigDecimalNumberConverter());
+            return defaultWriteConverter;
-        putWriteConverter(converterMap, new BooleanBooleanConverter());
+        }
-        putWriteConverter(converterMap, new ByteNumberConverter());
+        defaultWriteConverter = new HashMap<String, Converter>(16);
-        putWriteConverter(converterMap, new DateStringConverter());
+        putWriteConverter(new BigDecimalNumberConverter());
-        putWriteConverter(converterMap, new DoubleNumberConverter());
+        putWriteConverter(new BooleanBooleanConverter());
-        putWriteConverter(converterMap, new FloatNumberConverter());
+        putWriteConverter(new ByteNumberConverter());
-        putWriteConverter(converterMap, new IntegerNumberConverter());
+        putWriteConverter(new DateStringConverter());
-        putWriteConverter(converterMap, new LongNumberConverter());
+        putWriteConverter(new DoubleNumberConverter());
-        putWriteConverter(converterMap, new ShortNumberConverter());
+        putWriteConverter(new FloatNumberConverter());
-        putWriteConverter(converterMap, new StringStringConverter());
+        putWriteConverter(new IntegerNumberConverter());
-        return converterMap;
+        putWriteConverter(new LongNumberConverter());
+        putWriteConverter(new ShortNumberConverter());
+        putWriteConverter(new StringStringConverter());
+        return defaultWriteConverter;
     }
 
-    private static void putWriteConverter(Map<String, Converter> converterMap, Converter converter) {
+    private static void putWriteConverter(Converter converter) {
-        converterMap.put(ConverterKeyBuild.buildKey(converter.supportJavaTypeKey()), converter);
+        defaultWriteConverter.put(ConverterKeyBuild.buildKey(converter.supportJavaTypeKey()), converter);
     }
 
     /**
@@ -70,51 +76,63 @@ public class DefaultConverterLoader {
      * @return
      */
     public static Map<String, Converter> loadDefaultReadConverter() {
-        Map<String, Converter> converterMap = new HashMap<String, Converter>(64);
+        return loadAllConverter();
-        putReadConverter(converterMap, new BigDecimalBooleanConverter());
+    }
-        putReadConverter(converterMap, new BigDecimalNumberConverter());
+
-        putReadConverter(converterMap, new BigDecimalStringConverter());
+    /**
-
+     * Load all converter
-        putReadConverter(converterMap, new BooleanBooleanConverter());
+     *
-        putReadConverter(converterMap, new BooleanNumberConverter());
+     * @return
-        putReadConverter(converterMap, new BooleanStringConverter());
+     */
-
+    public static Map<String, Converter> loadAllConverter() {
-        putReadConverter(converterMap, new ByteBooleanConverter());
+        if (allConverter != null) {
-        putReadConverter(converterMap, new ByteNumberConverter());
+            return allConverter;
-        putReadConverter(converterMap, new ByteStringConverter());
+        }
-
+        allConverter = new HashMap<String, Converter>(64);
-        putReadConverter(converterMap, new DateNumberConverter());
+        putAllConverter(new BigDecimalBooleanConverter());
-        putReadConverter(converterMap, new DateStringConverter());
+        putAllConverter(new BigDecimalNumberConverter());
-
+        putAllConverter(new BigDecimalStringConverter());
-        putReadConverter(converterMap, new DoubleBooleanConverter());
+
-        putReadConverter(converterMap, new DoubleNumberConverter());
+        putAllConverter(new BooleanBooleanConverter());
-        putReadConverter(converterMap, new DoubleStringConverter());
+        putAllConverter(new BooleanNumberConverter());
-
+        putAllConverter(new BooleanStringConverter());
-        putReadConverter(converterMap, new FloatBooleanConverter());
+
-        putReadConverter(converterMap, new FloatNumberConverter());
+        putAllConverter(new ByteBooleanConverter());
-        putReadConverter(converterMap, new FloatStringConverter());
+        putAllConverter(new ByteNumberConverter());
-
+        putAllConverter(new ByteStringConverter());
-        putReadConverter(converterMap, new IntegerBooleanConverter());
+
-        putReadConverter(converterMap, new IntegerNumberConverter());
+        putAllConverter(new DateNumberConverter());
-        putReadConverter(converterMap, new IntegerStringConverter());
+        putAllConverter(new DateStringConverter());
-
+
-        putReadConverter(converterMap, new LongBooleanConverter());
+        putAllConverter(new DoubleBooleanConverter());
-        putReadConverter(converterMap, new LongNumberConverter());
+        putAllConverter(new DoubleNumberConverter());
-        putReadConverter(converterMap, new LongStringConverter());
+        putAllConverter(new DoubleStringConverter());
-
+
-        putReadConverter(converterMap, new ShortBooleanConverter());
+        putAllConverter(new FloatBooleanConverter());
-        putReadConverter(converterMap, new ShortNumberConverter());
+        putAllConverter(new FloatNumberConverter());
-        putReadConverter(converterMap, new ShortStringConverter());
+        putAllConverter(new FloatStringConverter());
-
+
-        putReadConverter(converterMap, new StringBooleanConverter());
+        putAllConverter(new IntegerBooleanConverter());
-        putReadConverter(converterMap, new StringNumberConverter());
+        putAllConverter(new IntegerNumberConverter());
-        putReadConverter(converterMap, new StringStringConverter());
+        putAllConverter(new IntegerStringConverter());
-        putReadConverter(converterMap, new StringErrorConverter());
+
-        return converterMap;
+        putAllConverter(new LongBooleanConverter());
+        putAllConverter(new LongNumberConverter());
+        putAllConverter(new LongStringConverter());
+
+        putAllConverter(new ShortBooleanConverter());
+        putAllConverter(new ShortNumberConverter());
+        putAllConverter(new ShortStringConverter());
+
+        putAllConverter(new StringBooleanConverter());
+        putAllConverter(new StringNumberConverter());
+        putAllConverter(new StringStringConverter());
+        putAllConverter(new StringErrorConverter());
+        return allConverter;
     }
 
-    private static void putReadConverter(Map<String, Converter> converterMap, Converter converter) {
+    private static void putAllConverter(Converter converter) {
-        converterMap.put(ConverterKeyBuild.buildKey(converter.supportJavaTypeKey(), converter.supportExcelTypeKey()),
+        allConverter.put(ConverterKeyBuild.buildKey(converter.supportJavaTypeKey(), converter.supportExcelTypeKey()),
             converter);
     }
 }

src/main/java/com/alibaba/excel/enums/WriteLastRowType.java

@@ -7,11 +7,15 @@ package com.alibaba.excel.enums;
  **/
 public enum WriteLastRowType {
     /**
-     * Tables are created without templates ,And any data has been written;
+     * Excel are created without templates ,And any data has been written;
      */
-    EMPTY,
+    COMMON_EMPTY,
     /**
-     * It's supposed to have data in it.Tables are created with templates ,or any data has been written;
+     * Excel are created with templates ,And any data has been written;
      */
-    HAVE_DATA,;
+    TEMPLATE_EMPTY,
+    /**
+     * Any data has been written;
+     */
+    HAS_DATA,;
 }

src/main/java/com/alibaba/excel/util/WorkBookUtil.java

@@ -25,11 +25,20 @@ public class WorkBookUtil {
     public static Workbook createWorkBook(WriteWorkbookHolder writeWorkbookHolder)
         throws IOException, InvalidFormatException {
         if (ExcelTypeEnum.XLSX.equals(writeWorkbookHolder.getExcelType())) {
+            XSSFWorkbook xssfWorkbook = null;
             if (writeWorkbookHolder.getTemplateFile() != null) {
-                return new SXSSFWorkbook(new XSSFWorkbook(writeWorkbookHolder.getTemplateFile()));
+                xssfWorkbook = new XSSFWorkbook(writeWorkbookHolder.getTemplateFile());
             }
             if (writeWorkbookHolder.getTemplateInputStream() != null) {
-                return new SXSSFWorkbook(new XSSFWorkbook(writeWorkbookHolder.getTemplateInputStream()));
+                xssfWorkbook = new XSSFWorkbook(writeWorkbookHolder.getTemplateInputStream());
+            }
+            // When using SXSSFWorkbook, you can't get the actual last line.But we need to read the last line when we
+            // are using the template, so we cache it
+            if (xssfWorkbook != null) {
+                for (int i = 0; i < xssfWorkbook.getNumberOfSheets(); i++) {
+                    writeWorkbookHolder.getTemplateLastRowMap().put(i, xssfWorkbook.getSheetAt(i).getLastRowNum());
+                }
+                return new SXSSFWorkbook(xssfWorkbook);
             }
             return new SXSSFWorkbook(500);
         }

src/main/java/com/alibaba/excel/write/ExcelBuilderImpl.java

@@ -10,14 +10,12 @@ import java.util.Set;
 
 import org.apache.poi.ss.usermodel.Cell;
 import org.apache.poi.ss.usermodel.Row;
-import org.apache.poi.ss.usermodel.Sheet;
 import org.apache.poi.ss.util.CellRangeAddress;
 
 import com.alibaba.excel.context.WriteContext;
 import com.alibaba.excel.context.WriteContextImpl;
 import com.alibaba.excel.converters.Converter;
 import com.alibaba.excel.converters.ConverterKeyBuild;
-import com.alibaba.excel.enums.WriteLastRowType;
 import com.alibaba.excel.exception.ExcelDataConvertException;
 import com.alibaba.excel.exception.ExcelGenerateException;
 import com.alibaba.excel.metadata.BaseRowModel;
@@ -64,22 +62,14 @@ public class ExcelBuilderImpl implements ExcelBuilder {
             return;
         }
         WriteSheetHolder writeSheetHolder = context.writeSheetHolder();
-        Sheet currentSheet = writeSheetHolder.getSheet();
+        int newRowIndex = writeSheetHolder.getNewRowIndexAndStartDoWrite();
-        int lastRowNum = currentSheet.getLastRowNum();
-        // 'lastRowNum' doesn't matter if it has one or zero,is's zero
-        if (lastRowNum == 0 && WriteLastRowType.EMPTY == writeSheetHolder.getWriteLastRowType()) {
-            lastRowNum--;
-        }
-        if (!data.isEmpty()) {
-            writeSheetHolder.setWriteLastRowType(WriteLastRowType.HAVE_DATA);
-        }
         if (writeSheetHolder.isNew() && !writeSheetHolder.getExcelWriteHeadProperty().hasHead()) {
-            lastRowNum += context.currentWriteHolder().relativeHeadRowIndex();
+            newRowIndex += context.currentWriteHolder().relativeHeadRowIndex();
         }
-        // Beanmap is out of order,so use fieldList
+        // BeanMap is out of order,so use fieldList
         List<Field> fieldList = new ArrayList<Field>();
         for (int relativeRowIndex = 0; relativeRowIndex < data.size(); relativeRowIndex++) {
-            int n = relativeRowIndex + lastRowNum + 1;
+            int n = relativeRowIndex + newRowIndex;
             addOneRowOfDataToExcel(data.get(relativeRowIndex), n, relativeRowIndex, fieldList);
         }
     }

src/main/java/com/alibaba/excel/write/merge/LoopMergeStrategy.java

@@ -13,21 +13,24 @@ import com.alibaba.excel.metadata.Head;
  */
 public class LoopMergeStrategy extends AbstractMergeStrategy {
     private int eachRow;
-    private int eachColumn;
+    private int columnIndex;
 
-    public LoopMergeStrategy(int eachRow, int eachColumn) {
+    public LoopMergeStrategy(int eachRow, int columnIndex) {
-        if (eachRow < 1 || eachColumn < 1) {
+        if (eachRow < 1) {
-            throw new IllegalArgumentException("All parameters must be greater than 1");
+            throw new IllegalArgumentException("EachRows must be greater than 1");
+        }
+        if (columnIndex < 0) {
+            throw new IllegalArgumentException("ColumnIndex must be greater than 0");
         }
         this.eachRow = eachRow;
-        this.eachColumn = eachColumn;
+        this.columnIndex = columnIndex;
     }
 
     @Override
     protected void merge(Sheet sheet, Cell cell, Head head, int relativeRowIndex) {
-        if (relativeRowIndex % eachRow == 0 && head.getColumnIndex() % eachColumn == 0) {
+        if (head.getColumnIndex() == columnIndex && relativeRowIndex % eachRow == 0) {
             CellRangeAddress cellRangeAddress = new CellRangeAddress(cell.getRowIndex(),
-                cell.getRowIndex() + eachRow - 1, cell.getColumnIndex(), cell.getColumnIndex() + eachColumn - 1);
+                cell.getRowIndex() + eachRow - 1, cell.getColumnIndex(), cell.getColumnIndex());
             sheet.addMergedRegion(cellRangeAddress);
         }
     }

src/main/java/com/alibaba/excel/write/metadata/holder/WriteSheetHolder.java

@@ -7,6 +7,7 @@ import org.apache.poi.ss.usermodel.Sheet;
 
 import com.alibaba.excel.enums.HolderEnum;
 import com.alibaba.excel.enums.WriteLastRowType;
+import com.alibaba.excel.support.ExcelTypeEnum;
 import com.alibaba.excel.write.metadata.WriteSheet;
 
 /**
@@ -60,9 +61,9 @@ public class WriteSheetHolder extends AbstractWriteHolder {
         this.parentWriteWorkbookHolder = writeWorkbookHolder;
         this.hasBeenInitializedTable = new HashMap<Integer, WriteTableHolder>();
         if (writeWorkbookHolder.getTemplateInputStream() == null && writeWorkbookHolder.getTemplateFile() == null) {
-            writeLastRowType = WriteLastRowType.EMPTY;
+            writeLastRowType = WriteLastRowType.COMMON_EMPTY;
         } else {
-            writeLastRowType = WriteLastRowType.HAVE_DATA;
+            writeLastRowType = WriteLastRowType.TEMPLATE_EMPTY;
         }
     }
 
@@ -122,6 +123,36 @@ public class WriteSheetHolder extends AbstractWriteHolder {
         this.writeLastRowType = writeLastRowType;
     }
 
+    /**
+     * Get the last line of index,you have to make sure that the data is written next
+     *
+     * @return
+     */
+    public int getNewRowIndexAndStartDoWrite() {
+        // 'getLastRowNum' doesn't matter if it has one or zero,is's zero
+        int newRowIndex = 0;
+        switch (writeLastRowType) {
+            case TEMPLATE_EMPTY:
+                if (parentWriteWorkbookHolder.getExcelType() == ExcelTypeEnum.XLSX) {
+                    if (parentWriteWorkbookHolder.getTemplateLastRowMap().containsKey(sheetNo)) {
+                        newRowIndex = parentWriteWorkbookHolder.getTemplateLastRowMap().get(sheetNo);
+                    }
+                } else {
+                    newRowIndex = sheet.getLastRowNum();
+                }
+                newRowIndex++;
+                break;
+            case HAS_DATA:
+                newRowIndex = sheet.getLastRowNum();
+                newRowIndex++;
+                break;
+            default:
+                break;
+        }
+        writeLastRowType = WriteLastRowType.HAS_DATA;
+        return newRowIndex;
+    }
+
     @Override
     public HolderEnum holderType() {
         return HolderEnum.SHEET;

src/main/java/com/alibaba/excel/write/metadata/holder/WriteWorkbookHolder.java

@@ -72,6 +72,11 @@ public class WriteWorkbookHolder extends AbstractWriteHolder {
      * prevent duplicate creation of sheet objects
      */
     private Map<Integer, WriteSheetHolder> hasBeenInitializedSheet;
+    /**
+     * When using SXSSFWorkbook, you can't get the actual last line.But we need to read the last line when we are using
+     * the template, so we cache it
+     */
+    private Map<Integer, Integer> templateLastRowMap;
 
     public WriteWorkbookHolder(WriteWorkbook writeWorkbook) {
         super(writeWorkbook, null, writeWorkbook.getConvertAllFiled());
@@ -114,6 +119,7 @@ public class WriteWorkbookHolder extends AbstractWriteHolder {
             this.mandatoryUseInputStream = writeWorkbook.getMandatoryUseInputStream();
         }
         this.hasBeenInitializedSheet = new HashMap<Integer, WriteSheetHolder>();
+        this.templateLastRowMap = new HashMap<Integer, Integer>(8);
     }
 
     public Workbook getWorkbook() {
@@ -196,6 +202,14 @@ public class WriteWorkbookHolder extends AbstractWriteHolder {
         this.mandatoryUseInputStream = mandatoryUseInputStream;
     }
 
+    public Map<Integer, Integer> getTemplateLastRowMap() {
+        return templateLastRowMap;
+    }
+
+    public void setTemplateLastRowMap(Map<Integer, Integer> templateLastRowMap) {
+        this.templateLastRowMap = templateLastRowMap;
+    }
+
     @Override
     public HolderEnum holderType() {
         return HolderEnum.WORKBOOK;

src/main/java/com/alibaba/excel/write/property/ExcelWriteHeadProperty.java

@@ -7,9 +7,13 @@ import java.util.List;
 import java.util.Map;
 import java.util.Set;
 
+import com.alibaba.excel.annotation.format.NumberFormat;
 import com.alibaba.excel.annotation.write.style.ColumnWidth;
 import com.alibaba.excel.annotation.write.style.ContentRowHeight;
 import com.alibaba.excel.annotation.write.style.HeadRowHeight;
+import com.alibaba.excel.converters.ConverterKeyBuild;
+import com.alibaba.excel.converters.DefaultConverterLoader;
+import com.alibaba.excel.enums.CellDataTypeEnum;
 import com.alibaba.excel.enums.HeadKindEnum;
 import com.alibaba.excel.metadata.CellRange;
 import com.alibaba.excel.metadata.Head;
@@ -48,8 +52,16 @@ public class ExcelWriteHeadProperty extends ExcelHeadProperty {
                 columnWidth = parentColumnWidth;
             }
             headData.setColumnWidthProperty(ColumnWidthProperty.build(columnWidth));
-        }
 
+            // If have @NumberFormat, 'NumberStringConverter' is specified by default
+            if (excelContentPropertyData.getConverter() == null) {
+                NumberFormat numberFormat = field.getAnnotation(NumberFormat.class);
+                if (numberFormat != null) {
+                    excelContentPropertyData.setConverter(DefaultConverterLoader.loadAllConverter()
+                        .get(ConverterKeyBuild.buildKey(field.getType(), CellDataTypeEnum.STRING)));
+                }
+            }
+        }
     }
 
     public RowHeightProperty getHeadRowHeightProperty() {

src/test/java/com/alibaba/easyexcel/test/core/template/TemplateDataTest.java

@@ -42,14 +42,14 @@ public class TemplateDataTest {
         EasyExcel.write(file, TemplateData.class)
             .withTemplate(TestFileUtil.readFile("template" + File.separator + "template07.xlsx")).sheet()
             .doWrite(data());
-        EasyExcel.read(file, TemplateData.class, new TemplateDataListener()).headRowNumber(2).sheet().doRead();
+        EasyExcel.read(file, TemplateData.class, new TemplateDataListener()).headRowNumber(3).sheet().doRead();
     }
 
     private void readAndWrite03(File file) {
         EasyExcel.write(file, TemplateData.class)
             .withTemplate(TestFileUtil.readFile("template" + File.separator + "template03.xls")).sheet()
             .doWrite(data());
-        EasyExcel.read(file, TemplateData.class, new TemplateDataListener()).headRowNumber(2).sheet().doRead();
+        EasyExcel.read(file, TemplateData.class, new TemplateDataListener()).headRowNumber(3).sheet().doRead();
     }
 
     private List<TemplateData> data() {

src/test/java/com/alibaba/easyexcel/test/demo/poi/PoiTest.java

@@ -0,0 +1,54 @@
+package com.alibaba.easyexcel.test.demo.poi;
+
+import java.io.File;
+import java.io.IOException;
+
+import org.apache.poi.xssf.streaming.SXSSFRow;
+import org.apache.poi.xssf.streaming.SXSSFSheet;
+import org.apache.poi.xssf.streaming.SXSSFWorkbook;
+import org.apache.poi.xssf.usermodel.XSSFRow;
+import org.apache.poi.xssf.usermodel.XSSFSheet;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
+import org.junit.Ignore;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.alibaba.easyexcel.test.util.TestFileUtil;
+
+/**
+ * 测试poi
+ *
+ * @author Jiaju Zhuang
+ **/
+@Ignore
+public class PoiTest {
+    private static final Logger LOGGER = LoggerFactory.getLogger(PoiTest.class);
+
+    @Test
+    public void lastRowNum() throws IOException {
+        String file = TestFileUtil.getPath() + "demo" + File.separator + "demo.xlsx";
+        SXSSFWorkbook xssfWorkbook = new SXSSFWorkbook(new XSSFWorkbook(file));
+        SXSSFSheet xssfSheet = xssfWorkbook.getSheetAt(0);
+        LOGGER.info("一共行数:{}", xssfSheet.getLastRowNum());
+        SXSSFRow row = xssfSheet.getRow(0);
+        LOGGER.info("第一行数据:{}", row);
+        xssfSheet.createRow(20);
+        LOGGER.info("一共行数:{}", xssfSheet.getLastRowNum());
+    }
+
+    @Test
+    public void lastRowNumXSSF() throws IOException {
+        String file = TestFileUtil.getPath() + "demo" + File.separator + "demo.xlsx";
+        XSSFWorkbook xssfWorkbook = new XSSFWorkbook(file);
+        LOGGER.info("一共:{}个sheet", xssfWorkbook.getNumberOfSheets());
+        XSSFSheet xssfSheet = xssfWorkbook.getSheetAt(0);
+        LOGGER.info("一共行数:{}", xssfSheet.getLastRowNum());
+        XSSFRow row = xssfSheet.getRow(0);
+        LOGGER.info("第一行数据:{}", row);
+        xssfSheet.createRow(20);
+        LOGGER.info("一共行数:{}", xssfSheet.getLastRowNum());
+
+
+    }
+}

src/test/java/com/alibaba/easyexcel/test/demo/read/ReadTest.java

@@ -13,6 +13,8 @@ import com.alibaba.easyexcel.test.util.TestFileUtil;
 import com.alibaba.excel.EasyExcelFactory;
 import com.alibaba.excel.ExcelReader;
 import com.alibaba.excel.annotation.ExcelProperty;
+import com.alibaba.excel.annotation.format.DateTimeFormat;
+import com.alibaba.excel.annotation.format.NumberFormat;
 import com.alibaba.excel.converters.DefaultConverterLoader;
 import com.alibaba.excel.read.metadata.ReadSheet;
 import com.alibaba.fastjson.JSON;
@@ -50,7 +52,10 @@ public class ReadTest {
 
     /**
      * 指定列的下标或者列名
-     * <li>使用{@link com.alibaba.excel.annotation.ExcelProperty}注解即可
+     *
+     * <li>1. 创建excel对应的实体对象,并使用{@link ExcelProperty}注解. 参照{@link IndexOrNameData}
+     * <li>2. 由于默认异步读取excel，所以需要创建excel一行一行的回调监听器，参照{@link IndexOrNameDataListener}
+     * <li>3. 直接读即可
      */
     @Test
     public void indexOrNameRead() {
@@ -78,10 +83,10 @@ public class ReadTest {
     }
 
     /**
-     * 日期、数字或者自定义格式转换。
+     * 日期、数字或者自定义格式转换
      * <p>
      * 默认读的转换器{@link DefaultConverterLoader#loadDefaultReadConverter()}
-     * <li>1. 创建excel对应的实体对象 参照{@link ConverterData}.里面可以使用注解.
+     * <li>1. 创建excel对应的实体对象 参照{@link ConverterData}.里面可以使用注解{@link DateTimeFormat}、{@link NumberFormat}或者自定义注解
      * <li>2. 由于默认异步读取excel，所以需要创建excel一行一行的回调监听器，参照{@link ConverterDataListener}
      * <li>3. 直接读即可
      */
@@ -98,7 +103,7 @@ public class ReadTest {
     }
 
     /**
-     * 多行头.
+     * 多行头
      *
      * <li>1. 创建excel对应的实体对象 参照{@link DemoData}
      * <li>2. 由于默认异步读取excel，所以需要创建excel一行一行的回调监听器，参照{@link DemoDataListener}
@@ -134,7 +139,6 @@ public class ReadTest {
             Map<Integer, String> data = (Map<Integer, String>)obj;
             LOGGER.info("读取到数据:{}", JSON.toJSONString(data));
         }
-
     }
 
 }

src/test/java/com/alibaba/easyexcel/test/demo/web/WebTest.java

@@ -26,7 +26,7 @@ public class WebTest {
      * 文件下载
      * <li>1. 创建excel对应的实体对象 参照{@link DownloadData}
      * <li>2. 设置返回的 参数
-     * <li>3. 直接写，这里注意，finish的时候会自动关闭OutputStream,当然你外面再关闭异常问题不大
+     * <li>3. 直接写，这里注意，finish的时候会自动关闭OutputStream,当然你外面再关闭流问题不大
      */
     @GetMapping("download")
     public void download(HttpServletResponse response) throws IOException {

src/test/java/com/alibaba/easyexcel/test/demo/write/ComplexHeadData.java

@@ -0,0 +1,22 @@
+package com.alibaba.easyexcel.test.demo.write;
+
+import java.util.Date;
+
+import com.alibaba.excel.annotation.ExcelProperty;
+
+import lombok.Data;
+
+/**
+ * 复杂头数据.这里最终效果是第一行就一个主标题，第二行分类
+ *
+ * @author Jiaju Zhuang
+ **/
+@Data
+public class ComplexHeadData {
+    @ExcelProperty({"主标题", "字符串标题"})
+    private String string;
+    @ExcelProperty({"主标题", "日期标题"})
+    private Date date;
+    @ExcelProperty({"主标题", "数字标题"})
+    private Double doubleData;
+}

src/test/java/com/alibaba/easyexcel/test/demo/write/ConverterData.java

@@ -0,0 +1,35 @@
+package com.alibaba.easyexcel.test.demo.write;
+
+import java.util.Date;
+
+import com.alibaba.excel.annotation.ExcelProperty;
+import com.alibaba.excel.annotation.format.DateTimeFormat;
+import com.alibaba.excel.annotation.format.NumberFormat;
+
+import lombok.Data;
+
+/**
+ * 基础数据类.这里的排序和excel里面的排序一致
+ *
+ * @author Jiaju Zhuang
+ **/
+@Data
+public class ConverterData {
+    /**
+     * 我想所有的 字符串起前面加上"自定义："三个字
+     */
+    @ExcelProperty(value = "字符串标题", converter = CustomStringStringConverter.class)
+    private String string;
+    /**
+     * 我想写到excel 用年月日的格式
+     */
+    @DateTimeFormat("yyyy年MM月dd日HH时mm分ss秒")
+    @ExcelProperty("日期标题")
+    private Date date;
+    /**
+     * 我想写到excel 用百分比表示
+     */
+    @NumberFormat("#.##%")
+    @ExcelProperty(value = "数字标题")
+    private Double doubleData;
+}

src/test/java/com/alibaba/easyexcel/test/demo/write/CustomStringStringConverter.java

@@ -0,0 +1,59 @@
+package com.alibaba.easyexcel.test.demo.write;
+
+import com.alibaba.excel.converters.Converter;
+import com.alibaba.excel.enums.CellDataTypeEnum;
+import com.alibaba.excel.metadata.CellData;
+import com.alibaba.excel.metadata.GlobalConfiguration;
+import com.alibaba.excel.metadata.property.ExcelContentProperty;
+
+/**
+ * String and string converter
+ *
+ * @author Jiaju Zhuang
+ */
+public class CustomStringStringConverter implements Converter<String> {
+    @Override
+    public Class supportJavaTypeKey() {
+        return String.class;
+    }
+
+    @Override
+    public CellDataTypeEnum supportExcelTypeKey() {
+        return CellDataTypeEnum.STRING;
+    }
+
+    /**
+     * 这里是读的时候会调用 不用管
+     *
+     * @param cellData
+     *            NotNull
+     * @param contentProperty
+     *            Nullable
+     * @param globalConfiguration
+     *            NotNull
+     * @return
+     */
+    @Override
+    public String convertToJavaData(CellData cellData, ExcelContentProperty contentProperty,
+        GlobalConfiguration globalConfiguration) {
+        return cellData.getStringValue();
+    }
+
+    /**
+     * 这里是写的时候会调用 不用管
+     *
+     * @param value
+     *            NotNull
+     * @param contentProperty
+     *            Nullable
+     * @param globalConfiguration
+     *            NotNull
+     * @return
+     */
+    @Override
+    public CellData convertToExcelData(String value, ExcelContentProperty contentProperty,
+        GlobalConfiguration globalConfiguration) {
+        return new CellData("自定义：" + value);
+    }
+
+}

src/test/java/com/alibaba/easyexcel/test/demo/write/IndexData.java

@@ -0,0 +1,25 @@
+package com.alibaba.easyexcel.test.demo.write;
+
+import java.util.Date;
+
+import com.alibaba.excel.annotation.ExcelProperty;
+
+import lombok.Data;
+
+/**
+ * 基础数据类
+ *
+ * @author Jiaju Zhuang
+ **/
+@Data
+public class IndexData {
+    @ExcelProperty(value = "字符串标题", index = 0)
+    private String string;
+    @ExcelProperty(value = "日期标题", index = 1)
+    private Date date;
+    /**
+     * 这里设置3 会导致第二列空的
+     */
+    @ExcelProperty(value = "数字标题", index = 3)
+    private Double doubleData;
+}

src/test/java/com/alibaba/easyexcel/test/demo/write/WidthAndHeightData.java

@@ -0,0 +1,32 @@
+package com.alibaba.easyexcel.test.demo.write;
+
+import java.util.Date;
+
+import com.alibaba.excel.annotation.ExcelProperty;
+import com.alibaba.excel.annotation.write.style.ColumnWidth;
+import com.alibaba.excel.annotation.write.style.ContentRowHeight;
+import com.alibaba.excel.annotation.write.style.HeadRowHeight;
+
+import lombok.Data;
+
+/**
+ * 基础数据类
+ *
+ * @author Jiaju Zhuang
+ **/
+@Data
+@ContentRowHeight(10)
+@HeadRowHeight(20)
+@ColumnWidth(25)
+public class WidthAndHeightData {
+    @ExcelProperty("字符串标题")
+    private String string;
+    @ExcelProperty("日期标题")
+    private Date date;
+    /**
+     * 宽度为50
+     */
+    @ColumnWidth(50)
+    @ExcelProperty("数字标题")
+    private Double doubleData;
+}

src/test/java/com/alibaba/easyexcel/test/demo/write/WriteTest.java

@@ -1,16 +1,30 @@
 package com.alibaba.easyexcel.test.demo.write;
 
+import java.io.File;
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.List;
 
+import org.apache.poi.ss.usermodel.FillPatternType;
+import org.apache.poi.ss.usermodel.IndexedColors;
 import org.junit.Ignore;
 import org.junit.Test;
 
 import com.alibaba.easyexcel.test.util.TestFileUtil;
 import com.alibaba.excel.EasyExcelFactory;
 import com.alibaba.excel.ExcelWriter;
+import com.alibaba.excel.annotation.ExcelProperty;
+import com.alibaba.excel.annotation.format.DateTimeFormat;
+import com.alibaba.excel.annotation.format.NumberFormat;
+import com.alibaba.excel.annotation.write.style.ColumnWidth;
+import com.alibaba.excel.annotation.write.style.ContentRowHeight;
+import com.alibaba.excel.annotation.write.style.HeadRowHeight;
+import com.alibaba.excel.write.merge.LoopMergeStrategy;
 import com.alibaba.excel.write.metadata.WriteSheet;
+import com.alibaba.excel.write.metadata.WriteTable;
+import com.alibaba.excel.write.metadata.style.WriteCellStyle;
+import com.alibaba.excel.write.metadata.style.WriteFont;
+import com.alibaba.excel.write.style.HorizontalCellStyleStrategy;
 
 /**
  * 写的常见写法
@@ -21,19 +35,19 @@ import com.alibaba.excel.write.metadata.WriteSheet;
 public class WriteTest {
     /**
      * 最简单的写
-     * <li>1. 创建excel对应的实体对象 参照{@link com.alibaba.easyexcel.test.demo.write.DemoData}
+     * <li>1. 创建excel对应的实体对象 参照{@link DemoData}
      * <li>2. 直接写即可
      */
     @Test
     public void simpleWrite() {
         // 写法1
-        String fileName = TestFileUtil.getPath() + "write" + System.currentTimeMillis() + ".xlsx";
+        String fileName = TestFileUtil.getPath() + "simpleWrite" + System.currentTimeMillis() + ".xlsx";
         // 这里 需要指定写用哪个class去读，然后写到第一个sheet，名字为模板 然后文件流会自动关闭
         // 如果这里想使用03 则 传入excelType参数即可
         EasyExcelFactory.write(fileName, DemoData.class).sheet("模板").doWrite(data());
 
         // 写法2
-        fileName = TestFileUtil.getPath() + "write" + System.currentTimeMillis() + ".xlsx";
+        fileName = TestFileUtil.getPath() + "simpleWrite" + System.currentTimeMillis() + ".xlsx";
         // 这里 需要指定写用哪个class去读
         ExcelWriter excelWriter = EasyExcelFactory.write(fileName, DemoData.class).build();
         WriteSheet writeSheet = EasyExcelFactory.writerSheet("模板").build();
@@ -42,12 +56,175 @@ public class WriteTest {
         excelWriter.finish();
     }
 
+    /**
+     * 指定写入的列
+     * <li>1. 创建excel对应的实体对象 参照{@link IndexData}
+     * <li>2. 使用{@link ExcelProperty}注解指定写入的列
+     * <li>3. 直接写即可
+     */
+    @Test
+    public void indexWrite() {
+        String fileName = TestFileUtil.getPath() + "indexWrite" + System.currentTimeMillis() + ".xlsx";
+        // 这里 需要指定写用哪个class去读，然后写到第一个sheet，名字为模板 然后文件流会自动关闭
+        EasyExcelFactory.write(fileName, IndexData.class).sheet("模板").doWrite(data());
+    }
+
+    /**
+     * 复杂头写入 指定写入的列
+     * <li>1. 创建excel对应的实体对象 参照{@link ComplexHeadData}
+     * <li>2. 使用{@link ExcelProperty}注解指定复杂的头
+     * <li>3. 直接写即可
+     */
+    @Test
+    public void complexHeadWrite() {
+        String fileName = TestFileUtil.getPath() + "complexHeadWrite" + System.currentTimeMillis() + ".xlsx";
+        // 这里 需要指定写用哪个class去读，然后写到第一个sheet，名字为模板 然后文件流会自动关闭
+        EasyExcelFactory.write(fileName, ComplexHeadData.class).sheet("模板").doWrite(data());
+    }
+
+    /**
+     * 重复多次写入
+     * <li>1. 创建excel对应的实体对象 参照{@link ComplexHeadData}
+     * <li>2. 使用{@link ExcelProperty}注解指定复杂的头
+     * <li>3. 直接调用二次写入即可
+     */
+    @Test
+    public void repeatedWrite() {
+        String fileName = TestFileUtil.getPath() + "repeatedWrite" + System.currentTimeMillis() + ".xlsx";
+        // 这里 需要指定写用哪个class去读
+        ExcelWriter excelWriter = EasyExcelFactory.write(fileName, DemoData.class).build();
+        WriteSheet writeSheet = EasyExcelFactory.writerSheet("模板").build();
+        // 第一次写入会创建头
+        excelWriter.write(data(), writeSheet);
+        // 第二次写入会在上一次写入的最后一行后面写入
+        excelWriter.write(data(), writeSheet);
+        /// 千万别忘记finish 会帮忙关闭流
+        excelWriter.finish();
+
+    }
+
+    /**
+     * 日期、数字或者自定义格式转换。
+     * <li>1. 创建excel对应的实体对象 参照{@link ConverterData}
+     * <li>2. 使用{@link ExcelProperty}配合使用注解{@link DateTimeFormat}、{@link NumberFormat}或者自定义注解
+     * <li>3. 直接写即可
+     */
+    @Test
+    public void converterWrite() {
+        String fileName = TestFileUtil.getPath() + "converterWrite" + System.currentTimeMillis() + ".xlsx";
+        // 这里 需要指定写用哪个class去读，然后写到第一个sheet，名字为模板 然后文件流会自动关闭
+        EasyExcelFactory.write(fileName, ConverterData.class).sheet("模板").doWrite(data());
+    }
+
+    /**
+     * 指定写入的列
+     * <li>1. 创建excel对应的实体对象 参照{@link IndexData}
+     * <li>2. 使用{@link ExcelProperty}注解指定写入的列
+     * <li>3. 使用withTemplate 读取模板
+     * <li>4. 直接写即可
+     */
+    @Test
+    public void templateWrite() {
+        String templateFileName = TestFileUtil.getPath() + "demo" + File.separator + "demo.xlsx";
+        String fileName = TestFileUtil.getPath() + "templateWrite" + System.currentTimeMillis() + ".xlsx";
+        // 这里 需要指定写用哪个class去读，然后写到第一个sheet，名字为模板 然后文件流会自动关闭
+        EasyExcelFactory.write(fileName, DemoData.class).withTemplate(templateFileName).sheet().doWrite(data());
+    }
+
+    /**
+     * 列宽、行高
+     * <li>1. 创建excel对应的实体对象 参照{@link WidthAndHeightData}
+     * <li>2. 使用注解{@link ColumnWidth}、{@link HeadRowHeight}、{@link ContentRowHeight}指定宽度或高度
+     * <li>3. 直接写即可
+     */
+    @Test
+    public void widthAndHeightWrite() {
+        String fileName = TestFileUtil.getPath() + "widthAndHeightWrite" + System.currentTimeMillis() + ".xlsx";
+        // 这里 需要指定写用哪个class去读，然后写到第一个sheet，名字为模板 然后文件流会自动关闭
+        EasyExcelFactory.write(fileName, WidthAndHeightData.class).sheet("模板").doWrite(data());
+    }
+
+    /**
+     * 自定义样式
+     * <li>1. 创建excel对应的实体对象 参照{@link DemoData}
+     * <li>2. 创建一个style策略 并注册
+     * <li>3. 直接写即可
+     */
+    @Test
+    public void styleWrite() {
+        String fileName = TestFileUtil.getPath() + "styleWrite" + System.currentTimeMillis() + ".xlsx";
+        // 头的策略
+        WriteCellStyle headWriteCellStyle = new WriteCellStyle();
+        // 背景设置为红色
+        headWriteCellStyle.setFillForegroundColor(IndexedColors.RED.getIndex());
+        WriteFont headWriteFont = new WriteFont();
+        headWriteFont.setFontHeightInPoints((short)20);
+        headWriteCellStyle.setWriteFont(headWriteFont);
+        // 内容的策略
+        WriteCellStyle contentWriteCellStyle = new WriteCellStyle();
+        // 这里需要指定 FillPatternType 为FillPatternType.SOLID_FOREGROUND 不然无法显示背景颜色.头默认了 FillPatternType所以可以不指定
+        contentWriteCellStyle.setFillPatternType(FillPatternType.SOLID_FOREGROUND);
+        // 背景绿色
+        contentWriteCellStyle.setFillForegroundColor(IndexedColors.GREEN.getIndex());
+        WriteFont contentWriteFont = new WriteFont();
+        // 字体大小
+        contentWriteFont.setFontHeightInPoints((short)20);
+        contentWriteCellStyle.setWriteFont(contentWriteFont);
+        // 这个策略是 头是头的样式 内容是内容的样式 其他的策略可以自己实现
+        HorizontalCellStyleStrategy horizontalCellStyleStrategy =
+            new HorizontalCellStyleStrategy(headWriteCellStyle, contentWriteCellStyle);
+
+        // 这里 需要指定写用哪个class去读，然后写到第一个sheet，名字为模板 然后文件流会自动关闭
+        EasyExcelFactory.write(fileName, DemoData.class).registerWriteHandler(horizontalCellStyleStrategy).sheet("模板")
+            .doWrite(data());
+    }
+
+    /**
+     * 合并单元格
+     * <li>1. 创建excel对应的实体对象 参照{@link DemoData}
+     * <li>2. 创建一个merge策略 并注册
+     * <li>3. 直接写即可
+     */
+    @Test
+    public void mergeWrite() {
+        String fileName = TestFileUtil.getPath() + "mergeWrite" + System.currentTimeMillis() + ".xlsx";
+        // 每隔2行会合并 把eachColumn 设置成 3 也就是我们数据的长度，所以就第一列会合并。当然其他合并策略也可以自己写
+        LoopMergeStrategy loopMergeStrategy = new LoopMergeStrategy(2, 0);
+        // 这里 需要指定写用哪个class去读，然后写到第一个sheet，名字为模板 然后文件流会自动关闭
+        EasyExcelFactory.write(fileName, DemoData.class).registerWriteHandler(loopMergeStrategy).sheet("模板")
+            .doWrite(data());
+    }
+
+    /**
+     * 使用table去写入
+     * <li>1. 创建excel对应的实体对象 参照{@link DemoData}
+     * <li>2. 然后写入table即可
+     */
+    @Test
+    public void tableWrite() {
+        String fileName = TestFileUtil.getPath() + "tableWrite" + System.currentTimeMillis() + ".xlsx";
+        // 这里直接写多个table的案例了，如果只有一个 也可以直一行代码搞定，参照其他案例
+        // 这里 需要指定写用哪个class去读
+        ExcelWriter excelWriter = EasyExcelFactory.write(fileName, DemoData.class).build();
+        // 把sheet设置为不需要头 不然会输出sheet的头 这样看起来第一个table 就有2个头了
+        WriteSheet writeSheet = EasyExcelFactory.writerSheet("模板").needHead(Boolean.FALSE).build();
+        // 这里必须指定需要头，table 会继承sheet的配置，sheet配置了不需要，table 默认也是不需要
+        WriteTable writeTable0 = EasyExcelFactory.writerTable(0).needHead(Boolean.TRUE).build();
+        WriteTable writeTable1 = EasyExcelFactory.writerTable(1).needHead(Boolean.TRUE).build();
+        // 第一次写入会创建头
+        excelWriter.write(data(), writeSheet, writeTable0);
+        // 第二次写如也会创建头，然后在第一次的后面写入数据
+        excelWriter.write(data(), writeSheet, writeTable1);
+        /// 千万别忘记finish 会帮忙关闭流
+        excelWriter.finish();
+
+    }
 
     private List<DemoData> data() {
         List<DemoData> list = new ArrayList<DemoData>();
         for (int i = 0; i < 10; i++) {
             DemoData data = new DemoData();
-            data.setString("字符串" + 0);
+            data.setString("字符串" + i);
             data.setDate(new Date());
             data.setDoubleData(0.56);
             list.add(data);

update.md

@@ -3,6 +3,8 @@
 * 优化读写对外接口
 * 加入转换器，方便格式转换
 * 极大优化读大文件的内存和效率
+* sheetNo 改成0开始
+* 读支持指定列名
 # 1.2.4
 修复read()方法存在的bug
 # 1.2.1