EasyExcel 填充+写入

使用 EasyExcel 导出 Excel 时，有时会遇到如下情况：

既要根据模板填充某些 sheet
又要根据业务写入某些 sheet

EasyExcel 官方没有提供这样的示例，经过自己的研究和实验，得到了如下步骤：

定义导出文件名

String fileName = "测试.xlsx";

获取模板文件

InputStream templateFile = ResourceUtil.getResourceObj("templates/template.xlsx").getStream();

此时读取的模板文件默认为压缩文件，是不能在后续进行填充的，所以需要在 pom.xml 中进行配置：

<build><plugins><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-resources-plugin</artifactId><version>2.6</version><configuration><!-- 配置不需要压缩的文件 --><nonFilteredFileExtensions><nonFilteredFileExtension>xls</nonFilteredFileExtension><nonFilteredFileExtension>xlsx</nonFilteredFileExtension></nonFilteredFileExtensions></configuration></plugin></plugins>
</build>

定义填充页数据

@Data
public class FillData {private String name;private double number;
}

FillData fillData = new FillData();
fillData.setName("张三");
fillData.setNumber(5.2);

定义业务页数据

@Data
public class BusinessData {@ExcelProperty("字符串标题")private String string;@ExcelProperty("日期标题")private Date date;@ExcelProperty("数字标题")private Double doubleData;/*** 忽略这个字段*/@ExcelIgnoreprivate String ignore;
}

BusinessData businessData = new BusinessData();
businessData.setString("测试");
businessData.setDate(new Date());
businessData.setDoubleData(1.0);
List<BusinessData> businessDataList = Collections.singletonList(businessData);

定义写入器

ExcelWriter excelWriter = EasyExcel.write(fileName).withTemplate(templateFile).build();

定义填充页 sheet

WriteSheet writeSheet0 = EasyExcel.writerSheet().registerWriteHandler(new CustomTemplateSheetStrategy("动态命名sheet")).build();

这里使用了 CustomTemplateSheetStrategy。

之所以要使用该拦截器，是因为填充时默认是只能取模板定义的 sheet 名称作为填充页的 sheet 名称，但业务中往往是需要动态命名 sheet 的，所以使用拦截器进行拦截处理后命名。

CustomTemplateSheetStrategy代码如下：

import com.alibaba.excel.write.handler.SheetWriteHandler;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteWorkbookHolder;/*** 自定义模板导出sheet拦截器* * @author 天航星* @date 2024-07-03 13:48*/
public class CustomTemplateSheetStrategy implements SheetWriteHandler {private Integer sheetNo;private String sheetName;public CustomTemplateSheetStrategy(String sheetName) {this.sheetName = sheetName;}public CustomTemplateSheetStrategy(Integer sheetNo, String sheetName) {this.sheetNo = sheetNo;this.sheetName = sheetName;}@Overridepublic void beforeSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {}/*** 功能：动态修改模板中sheet的名称* sheet创建完成后调用* @param writeWorkbookHolder* @param writeSheetHolder*/@Overridepublic void afterSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {if (sheetName == null) {return;}if (sheetNo == null) {sheetNo = 0;}writeWorkbookHolder.getCachedWorkbook().setSheetName(sheetNo, sheetName);}
}

定义业务页 sheet

WriteSheet writeSheet1 = EasyExcel.writerSheet("Sheet1").head(BusinessData.class).build();

填充数据

excelWriter.fill(fillData, writeSheet0);

**注意：**这里一定要传入对象，不能传入列表，否则填充的内容会变为空白。

写入数据

excelWriter.write(businessDataList, writeSheet1);

关闭写入器

excelWriter.finish();

**注意：**这里必须要关闭写入器，不然写入的文件为空。

根据以上步骤即可以填充+写入的方式导出 Excel，以下是完整代码：

import cn.hutool.core.io.resource.ResourceUtil;
import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.ExcelWriter;
import com.alibaba.excel.annotation.ExcelIgnore;
import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.write.metadata.WriteSheet;
import com.sevnce.pop.customer.handler.CustomTemplateSheetStrategy;
import lombok.Data;
import org.junit.jupiter.api.Test;
import java.io.InputStream;
import java.util.Collections;
import java.util.Date;
import java.util.List;/*** 测试用例** @author 天航星* @date 2024-07-03 10:55*/
public class TestDemo {@Datapublic class FillData {/*** 名称*/private String name;/*** 数字*/private double number;}@Datapublic class BusinessData {@ExcelProperty("字符串标题")private String string;@ExcelProperty("日期标题")private Date date;@ExcelProperty("数字标题")private Double doubleData;/*** 忽略这个字段*/@ExcelIgnoreprivate String ignore;}@Testpublic void test() {// 定义导出文件名String fileName = "测试.xlsx";// 获取模板文件InputStream templateFile = ResourceUtil.getResourceObj("templates/template.xlsx").getStream();// 定义填充页数据FillData fillData = new FillData();fillData.setName("张三");fillData.setNumber(5.2);// 定义业务页数据BusinessData businessData = new BusinessData();businessData.setString("测试");businessData.setDate(new Date());businessData.setDoubleData(1.0);List<BusinessData> businessDataList = Collections.singletonList(businessData);// 定义写入器ExcelWriter excelWriter = EasyExcel.write(fileName).withTemplate(templateFile).build();// 定义填充页 sheetWriteSheet writeSheet0 = EasyExcel.writerSheet().registerWriteHandler(new CustomTemplateSheetStrategy("动态命名sheet")).build();// 定义业务页 sheetWriteSheet writeSheet1 = EasyExcel.writerSheet("Sheet1").head(BusinessData.class).build();// 填充数据excelWriter.fill(fillData, writeSheet0);// 写入数据excelWriter.write(businessDataList, writeSheet1);// 关闭写入器excelWriter.finish();}
}