mirror of https://github.com/alibaba/easyexcel
Ling Hengqian
2 years ago
committed by
GitHub
41 changed files with 1201 additions and 221 deletions
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# 建议先去看文档 |
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[快速开始](https://easyexcel.opensource.alibaba.com/docs/current/) 、[常见问题](https://easyexcel.opensource.alibaba.com/qa/) |
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# 异常代码 |
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```java |
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这里写你的代码 |
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``` |
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# 异常提示 |
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大家尽量把问题一次性描述清楚，然后贴上全部异常，这样方便把问题一次性解决掉。 |
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# 其他描述 |
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# 通过 Github action， 在仓库的每一次 commit 后自动同步到 Gitee 上 |
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name: Mirror the Github organization repos to Gitee |
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on: [push, pull_request] |
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jobs: |
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repo-sync: |
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runs-on: ubuntu-latest |
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steps: |
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- uses: actions/checkout@main |
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with: |
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persist-credentials: false |
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- name: Mirror the Github organization repos to Gitee. |
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uses: Yikun/hub-mirror-action@master |
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with: |
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# 必选，需要同步的 Github 这里记住选择的是仓库 或者账号 而不是具体的项目 |
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src: github/alibaba |
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# 必选，需要同步到的 Gitee 这里记住选择的是仓库 或者账号 而不是具体的项目 |
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dst: gitee/easyexcel |
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# 必选，Gitee公钥对应的私钥，https://gitee.com/profile/sshkeys |
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dst_key: ${{ secrets.GITEE_PRIVATE_KEY }} |
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# 必选，Gitee对应的用于创建仓库的token，https://gitee.com/profile/personal_access_tokens |
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dst_token: ${{ secrets.GITEE_TOKEN }} |
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# 如果是组织，指定组织即可，默认为用户 user |
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account_type: org |
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# 需要同步的仓库里面的项目 |
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static_list: "easyexcel" |
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package com.alibaba.excel.constant; |
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import java.math.MathContext; |
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import java.math.RoundingMode; |
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/** |
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* Used to store constant |
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* |
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* @author Jiaju Zhuang |
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*/ |
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public class EasyExcelConstants { |
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/** |
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* Excel by default with 15 to store Numbers, and the double in Java can use to store number 17, led to the accuracy |
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* will be a problem. So you need to set up 15 to deal with precision |
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*/ |
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public static final MathContext EXCEL_MATH_CONTEXT = new MathContext(15, RoundingMode.HALF_UP); |
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} |
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package com.alibaba.excel.enums; |
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import java.math.BigDecimal; |
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import java.time.LocalDateTime; |
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import java.util.HashMap; |
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import java.util.Map; |
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import com.alibaba.excel.metadata.data.CellData; |
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import com.alibaba.excel.util.StringUtils; |
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/** |
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* Read not to {@code com.alibaba.excel.metadata.BasicParameter#clazz} value, the default will return type. |
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* |
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* @author Jiaju Zhuang |
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*/ |
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public enum ReadDefaultReturnEnum { |
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/** |
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* default.The content of cells into string, is the same as you see in the excel. |
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*/ |
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STRING, |
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/** |
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* Returns the actual type. |
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* Will be automatically selected according to the cell contents what return type, will return the following class: |
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* <ol> |
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* <li>{@link BigDecimal}</li> |
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* <li>{@link Boolean}</li> |
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* <li>{@link String}</li> |
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* <li>{@link LocalDateTime}</li> |
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* </ol> |
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*/ |
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ACTUAL_DATA, |
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/** |
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* Return to {@link com.alibaba.excel.metadata.data.ReadCellData}, can decide which field you need. |
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*/ |
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READ_CELL_DATA, |
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; |
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} |
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package com.alibaba.easyexcel.test.demo.rare; |
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import java.io.File; |
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import java.util.Date; |
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import java.util.List; |
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import com.alibaba.easyexcel.test.demo.write.DemoData; |
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import com.alibaba.easyexcel.test.util.TestFileUtil; |
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import com.alibaba.excel.EasyExcel; |
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import com.alibaba.excel.ExcelWriter; |
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import com.alibaba.excel.util.FileUtils; |
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import com.alibaba.excel.util.ListUtils; |
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import com.alibaba.excel.write.handler.RowWriteHandler; |
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import com.alibaba.excel.write.handler.SheetWriteHandler; |
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import com.alibaba.excel.write.handler.WorkbookWriteHandler; |
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import com.alibaba.excel.write.handler.context.RowWriteHandlerContext; |
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import com.alibaba.excel.write.handler.context.SheetWriteHandlerContext; |
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import com.alibaba.excel.write.handler.context.WorkbookWriteHandlerContext; |
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import com.alibaba.excel.write.metadata.WriteSheet; |
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import lombok.extern.slf4j.Slf4j; |
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import org.apache.poi.ss.usermodel.Cell; |
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import org.apache.poi.ss.usermodel.Row; |
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import org.apache.poi.ss.usermodel.Sheet; |
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import org.apache.poi.ss.usermodel.Workbook; |
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import org.apache.poi.xssf.streaming.SXSSFWorkbook; |
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import org.junit.Ignore; |
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import org.junit.Test; |
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/** |
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* 记录一些不太常见的案例 |
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* |
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* @author Jiaju Zhuang |
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*/ |
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@Ignore |
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@Slf4j |
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public class WriteTest { |
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/** |
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* 压缩临时文件 |
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* 在导出Excel且格式为xlsx的时候会生成一个临时的xml文件，会比较大，再磁盘不太够的情况下，可以压缩。 |
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* 当然压缩式耗费性能的 |
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*/ |
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@Test |
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public void compressedTemporaryFile() { |
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log.info("临时的xml存储在:{}", FileUtils.getPoiFilesPath()); |
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File file = TestFileUtil.createNewFile("rare/compressedTemporaryFile" + System.currentTimeMillis() |
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+ ".xlsx"); |
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// 这里 需要指定写用哪个class去写
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try (ExcelWriter excelWriter = EasyExcel.write(file, DemoData.class).registerWriteHandler( |
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new WorkbookWriteHandler() { |
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/** |
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* 拦截Workbook创建完成事件 |
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* @param context |
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*/ |
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@Override |
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public void afterWorkbookCreate(WorkbookWriteHandlerContext context) { |
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// 获取到Workbook对象
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Workbook workbook = context.getWriteWorkbookHolder().getWorkbook(); |
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// 只有SXSSFWorkbook模式才会生成临时文件
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if (workbook instanceof SXSSFWorkbook) { |
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SXSSFWorkbook sxssfWorkbook = (SXSSFWorkbook)workbook; |
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// 设置临时文件压缩，当然这个会浪费cpu性能 但是临时文件会变小
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sxssfWorkbook.setCompressTempFiles(true); |
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} |
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} |
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}).build()) { |
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// 这里注意 如果同一个sheet只要创建一次
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WriteSheet writeSheet = EasyExcel.writerSheet("模板").build(); |
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// 10万数据 确保有足够的空间
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for (int i = 0; i < 10000; i++) { |
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// 分页去数据库查询数据 这里可以去数据库查询每一页的数据
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List<DemoData> data = data(); |
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excelWriter.write(data, writeSheet); |
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} |
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log.info("写入完毕，开始准备迁移压缩文件。"); |
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} |
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} |
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/** |
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* 在指定单元格写入数据 |
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*/ |
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@Test |
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public void specifiedCellWrite() { |
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File file = TestFileUtil.createNewFile("rare/specifiedCellWrite" + System.currentTimeMillis() |
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+ ".xlsx"); |
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// 需要区分是在 最后一行之前 还是之后
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// 区分的原因是：excel只能一直向前，而且内存里面只存储100条，而afterRowDispose是在每一行写入完成的时候调用，所以修改一行需要拦截这个事件
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// 如果是在最后一行之后，由于后面不会再有数据了，所以只要拦截afterWorkbookDispose，在整个excel快写完的时候调用，继续写入数据即可
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EasyExcel.write(file, DemoData.class) |
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// 写入的值在最后一行之前
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.registerWriteHandler(new RowWriteHandler() { |
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@Override |
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public void afterRowDispose(RowWriteHandlerContext context) { |
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if (context.getRow().getRowNum() == 2) { |
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Cell cell = context.getRow().getCell(2); |
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if (cell == null) { |
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cell = context.getRow().createCell(2); |
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} |
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cell.setCellValue("测试的第二行数据呀"); |
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} |
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} |
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}) |
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// 写入的值 在最后一一行之后
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.registerWriteHandler(new WorkbookWriteHandler() { |
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@Override |
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public void afterWorkbookDispose(WorkbookWriteHandlerContext context) { |
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Workbook workbook = context.getWriteWorkbookHolder().getWorkbook(); |
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Sheet sheet = workbook.getSheetAt(0); |
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Row row = sheet.getRow(99); |
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if (row == null) { |
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row = sheet.createRow(99); |
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} |
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Cell cell = row.getCell(2); |
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if (cell == null) { |
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cell = row.createCell(2); |
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} |
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cell.setCellValue("测试地99行数据呀"); |
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} |
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}) |
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.sheet("模板") |
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.doWrite(data()); |
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log.info("写入到文件完成:{}", file); |
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} |
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private List<DemoData> data() { |
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List<DemoData> list = ListUtils.newArrayList(); |
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for (int i = 0; i < 10; i++) { |
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DemoData data = new DemoData(); |
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data.setString("字符串" + i); |
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data.setDate(new Date()); |
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data.setDoubleData(0.56); |
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list.add(data); |
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} |
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return list; |
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} |
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} |
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package com.alibaba.easyexcel.test.temp; |
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import java.math.BigDecimal; |
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import java.util.Date; |
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import com.alibaba.excel.annotation.ExcelIgnore; |
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import com.alibaba.excel.annotation.ExcelProperty; |
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import lombok.EqualsAndHashCode; |
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import lombok.Getter; |
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import lombok.Setter; |
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/** |
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* 基础数据类 |
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* |
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* @author Jiaju Zhuang |
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**/ |
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@Getter |
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@Setter |
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@EqualsAndHashCode |
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public class DemoData2 { |
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@ExcelProperty("字符串标题") |
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private String string; |
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@ExcelProperty("日期标题") |
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private Date date; |
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@ExcelProperty("数字标题") |
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private Double doubleData; |
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@ExcelProperty("数字标题2") |
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private BigDecimal bigDecimal; |
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/** |
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* 忽略这个字段 |
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*/ |
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@ExcelIgnore |
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private String ignore; |
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} |
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package com.alibaba.easyexcel.test.temp; |
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import java.time.LocalDateTime; |
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import java.util.Date; |
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import com.alibaba.excel.annotation.ExcelIgnore; |
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import com.alibaba.excel.annotation.ExcelProperty; |
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import lombok.EqualsAndHashCode; |
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import lombok.Getter; |
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import lombok.Setter; |
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/** |
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* 基础数据类 |
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* |
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* @author Jiaju Zhuang |
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**/ |
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@Getter |
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@Setter |
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@EqualsAndHashCode |
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public class DemoData3 { |
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@ExcelProperty("日期时间标题") |
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private LocalDateTime localDateTime; |
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} |
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