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# easyexcel核心功能
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## *读任意大小的03、07版Excel不会OO]<br />
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## *读Excel自动通过注解，把结果映射为java模型<br />
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## *读Excel支持多sheet<br />
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## *读Excel时候是否对Excel内容做trim()增加容错<br />
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## *写小量数据的03版Excel（不要超过2000行）<br />
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## *写任意大07版Excel不会OOM<br />
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## *写Excel通过注解将表头自动写入Excel<br />
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## *写Excel可以自定义Excel样式 如：字体，加粗，表头颜色，数据内容颜色<br />
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## *写Excel到多个不同sheet<br />
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## *写Excel时一个sheet可以写多个Table<br />
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## *写Excel时候自定义是否需要写表头<br />
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## 二方包依赖
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使用前最好咨询下最新版，或者到mvn仓库搜索先easyexcel的最新版
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```
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<dependency>
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<groupId>com.alibaba</groupId>
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<artifactId>easyexcel</artifactId>
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<version>1.0.0-RELEASE</version>
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</dependency>
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```
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## 读Excel
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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。
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### 无java模型直接把excel解析的每行结果以List<String>返回 在ExcelListener获取解析结果
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读excel代码示例如下：
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```
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@Test
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public void testExcel2003NoModel() {
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InputStream inputStream = getInputStream("loan1.xls");
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try {
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// 解析每行结果在listener中处理
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ExcelListener listener = new ExcelListener();
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ExcelReader excelReader = new ExcelReader(inputStream, ExcelTypeEnum.XLS, null, listener);
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excelReader.read();
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} catch (Exception e) {
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} finally {
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try {
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inputStream.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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```
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ExcelListener示例代码如下：
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```
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/* 解析监听器，
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* 每解析一行会回调invoke()方法。
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* 整个excel解析结束会执行doAfterAllAnalysed()方法
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*
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* 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。
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* @author jipengfei
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* @date 2017/03/14
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*/
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public class ExcelListener extends AnalysisEventListener {
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//自定义用于暂时存储data。
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//可以通过实例获取该值
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private List<Object> datas = new ArrayList<Object>();
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public void invoke(Object object, AnalysisContext context) {
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System.out.println("当前行："+context.getCurrentRowNum());
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System.out.println(object);
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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。
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doSomething(object);//根据自己业务做处理
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}
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private void doSomething(Object object) {
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//1、入库调用接口
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}
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public void doAfterAllAnalysed(AnalysisContext context) {
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// datas.clear();//解析结束销毁不用的资源
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}
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public List<Object> getDatas() {
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return datas;
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}
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public void setDatas(List<Object> datas) {
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this.datas = datas;
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}
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}
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```
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### 有java模型映射
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java模型写法如下：
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```
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public class LoanInfo extends BaseRowModel {
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@ExcelProperty(index = 0)
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private String bankLoanId;
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@ExcelProperty(index = 1)
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private Long customerId;
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@ExcelProperty(index = 2,format = "yyyy/MM/dd")
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private Date loanDate;
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@ExcelProperty(index = 3)
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private BigDecimal quota;
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@ExcelProperty(index = 4)
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private String bankInterestRate;
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@ExcelProperty(index = 5)
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private Integer loanTerm;
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@ExcelProperty(index = 6,format = "yyyy/MM/dd")
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private Date loanEndDate;
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@ExcelProperty(index = 7)
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private BigDecimal interestPerMonth;
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@ExcelProperty(value = {"一级表头","二级表头"})
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private BigDecimal sax;
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}
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```
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@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。
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```
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@Test
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public void testExcel2003WithReflectModel() {
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InputStream inputStream = getInputStream("loan1.xls");
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try {
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// 解析每行结果在listener中处理
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AnalysisEventListener listener = new ExcelListener();
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ExcelReader excelReader = new ExcelReader(inputStream, ExcelTypeEnum.XLS, null, listener);
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excelReader.read(new Sheet(1, 2, LoanInfo.class));
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} catch (Exception e) {
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} finally {
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try {
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inputStream.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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```
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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。
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## 写Excel
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### 每行数据是List<String>无表头
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```
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OutputStream out = new FileOutputStream("/Users/jipengfei/77.xlsx");
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try {
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ExcelWriter writer = new ExcelWriter(out, ExcelTypeEnum.XLSX,false);
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//写第一个sheet, sheet1 数据全是List<String> 无模型映射关系
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Sheet sheet1 = new Sheet(1, 0);
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sheet1.setSheetName("第一个sheet");
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writer.write(getListString(), sheet1);
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writer.finish();
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} catch (Exception e) {
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e.printStackTrace();
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} finally {
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try {
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out.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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```
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### 每行数据是一个java模型有表头----表头层级为一
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生成Excel格式如下图
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模型写法如下：
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```
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public class ExcelPropertyIndexModel extends BaseRowModel {
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@ExcelProperty(value = "姓名" ,index = 0)
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private String name;
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@ExcelProperty(value = "年龄",index = 1)
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private String age;
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@ExcelProperty(value = "邮箱",index = 2)
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private String email;
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@ExcelProperty(value = "地址",index = 3)
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private String address;
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@ExcelProperty(value = "性别",index = 4)
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private String sax;
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@ExcelProperty(value = "高度",index = 5)
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private String heigh;
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@ExcelProperty(value = "备注",index = 6)
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private String last;
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}
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```
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@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。
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```
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@Test
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public void test1() throws FileNotFoundException {
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OutputStream out = new FileOutputStream("/Users/jipengfei/78.xlsx");
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try {
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ExcelWriter writer = new ExcelWriter(out, ExcelTypeEnum.XLSX);
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//写第一个sheet, sheet1 数据全是List<String> 无模型映射关系
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Sheet sheet1 = new Sheet(1, 0,ExcelPropertyIndexModel.class);
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writer.write(getData(), sheet1);
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writer.finish();
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} catch (Exception e) {
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e.printStackTrace();
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} finally {
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try {
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out.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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```
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### 每行数据是一个java模型有表头----表头层级为多层级
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生成Excel格式如下图：
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java模型写法如下：
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```
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public class MultiLineHeadExcelModel extends BaseRowModel {
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@ExcelProperty(value = {"表头1","表头1","表头31"},index = 0)
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private String p1;
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@ExcelProperty(value = {"表头1","表头1","表头32"},index = 1)
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private String p2;
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@ExcelProperty(value = {"表头3","表头3","表头3"},index = 2)
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private int p3;
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@ExcelProperty(value = {"表头4","表头4","表头4"},index = 3)
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private long p4;
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@ExcelProperty(value = {"表头5","表头51","表头52"},index = 4)
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private String p5;
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@ExcelProperty(value = {"表头6","表头61","表头611"},index = 5)
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private String p6;
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@ExcelProperty(value = {"表头6","表头61","表头612"},index = 6)
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private String p7;
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@ExcelProperty(value = {"表头6","表头62","表头621"},index = 7)
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private String p8;
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@ExcelProperty(value = {"表头6","表头62","表头622"},index = 8)
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private String p9;
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}
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```
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写Excel写法同上，只需将ExcelPropertyIndexModel.class改为MultiLineHeadExcelModel.class
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### 一个Excel多个sheet写法
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```
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@Test
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public void test1() throws FileNotFoundException {
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OutputStream out = new FileOutputStream("/Users/jipengfei/77.xlsx");
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try {
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ExcelWriter writer = new ExcelWriter(out, ExcelTypeEnum.XLSX,false);
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//写第一个sheet, sheet1 数据全是List<String> 无模型映射关系
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Sheet sheet1 = new Sheet(1, 0);
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sheet1.setSheetName("第一个sheet");
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writer.write(getListString(), sheet1);
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//写第二个sheet sheet2 模型上打有表头的注解，合并单元格
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Sheet sheet2 = new Sheet(2, 3, MultiLineHeadExcelModel.class, "第二个sheet", null);
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sheet2.setTableStyle(getTableStyle1());
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writer.write(getModeldatas(), sheet2);
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//写sheet3 模型上没有注解，表头数据动态传入
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List<List<String>> head = new ArrayList<List<String>>();
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List<String> headCoulumn1 = new ArrayList<String>();
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List<String> headCoulumn2 = new ArrayList<String>();
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List<String> headCoulumn3 = new ArrayList<String>();
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headCoulumn1.add("第一列");
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headCoulumn2.add("第二列");
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headCoulumn3.add("第三列");
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head.add(headCoulumn1);
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head.add(headCoulumn2);
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head.add(headCoulumn3);
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Sheet sheet3 = new Sheet(3, 1, NoAnnModel.class, "第三个sheet", head);
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writer.write(getNoAnnModels(), sheet3);
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writer.finish();
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} catch (Exception e) {
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e.printStackTrace();
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} finally {
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try {
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out.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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```
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### 一个sheet中有多个表格
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```
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@Test
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public void test2() throws FileNotFoundException {
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OutputStream out = new FileOutputStream("/Users/jipengfei/77.xlsx");
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try {
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ExcelWriter writer = new ExcelWriter(out, ExcelTypeEnum.XLSX,false);
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//写sheet1 数据全是List<String> 无模型映射关系
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Sheet sheet1 = new Sheet(1, 0);
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sheet1.setSheetName("第一个sheet");
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Table table1 = new Table(1);
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writer.write(getListString(), sheet1, table1);
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writer.write(getListString(), sheet1, table1);
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//写sheet2 模型上打有表头的注解
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Table table2 = new Table(2);
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table2.setTableStyle(getTableStyle1());
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table2.setClazz(MultiLineHeadExcelModel.class);
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writer.write(getModeldatas(), sheet1, table2);
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//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
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List<List<String>> head = new ArrayList<List<String>>();
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List<String> headCoulumn1 = new ArrayList<String>();
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List<String> headCoulumn2 = new ArrayList<String>();
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List<String> headCoulumn3 = new ArrayList<String>();
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headCoulumn1.add("第一列");
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headCoulumn2.add("第二列");
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headCoulumn3.add("第三列");
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|
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head.add(headCoulumn1);
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|
|
head.add(headCoulumn2);
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|
|
head.add(headCoulumn3);
|
|
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|
|
Table table3 = new Table(3);
|
|
|
|
|
table3.setHead(head);
|
|
|
|
|
table3.setClazz(NoAnnModel.class);
|
|
|
|
|
table3.setTableStyle(getTableStyle2());
|
|
|
|
|
writer.write(getNoAnnModels(), sheet1, table3);
|
|
|
|
|
writer.write(getNoAnnModels(), sheet1, table3);
|
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|
|
writer.finish();
|
|
|
|
|
} catch (Exception e) {
|
|
|
|
|
e.printStackTrace();
|
|
|
|
|
} finally {
|
|
|
|
|
try {
|
|
|
|
|
out.close();
|
|
|
|
|
} catch (IOException e) {
|
|
|
|
|
e.printStackTrace();
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
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|
|
```
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## 测试数据分析
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从上面的性能测试可以看出easyexcel在解析耗时上比poiuserModel模式弱了一些。主要原因是我内部采用了反射做模型字段映射，中间我也加了cache，但感觉这点差距可以接受的。但在内存消耗上差别就比较明显了，easyexcel在后面文件再增大，内存消耗几乎不会增加了。但poi userModel就不一样了，简直就要爆掉了。想想一个excel解析200M，同时有20个人再用估计一台机器就挂了。
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