简单介绍一下Java中的Excel文件导出功能（基于HttpServletResponse实现下载）

首先，引入需要依赖的jar包：

<dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>3.14</version></dependency><dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml</artifactId> <version>3.14</version></dependency>

编写一个工具类：

package exceloutput;import org.apache.commons.lang3.StringUtils;import org.apache.poi.ss.usermodel.Cell;import org.apache.poi.ss.usermodel.Row;import org.apache.poi.ss.usermodel.Workbook;import org.apache.poi.xssf.streaming.SXSSFSheet;import org.apache.poi.xssf.streaming.SXSSFWorkbook;import javax.servlet.http.HttpServletResponse;import java.io.IOException;import java.io.UnsupportedEncodingException;import java.util.List;import java.util.UUID;/** * @author haozz * @date 2018/6/6 9:57 * @description excel导出抽象工具类 **/public abstract class ExportAbstractUtil { public void write(HttpServletResponse response, Workbook workbook){ String fileName = UUID.randomUUID().toString()+".xls"; pwrite(response,workbook,fileName); } public void write(HttpServletResponse response,Workbook workbook,String fileName){ if(StringUtils.isEmpty(fileName)){ fileName = UUID.randomUUID().toString()+".xls"; } pwrite(response,workbook,fileName); } public void write(HttpServletResponse response, List<List<String>> lists,String fileName){ if(StringUtils.isEmpty(fileName)){ fileName = UUID.randomUUID().toString()+".xls"; } SXSSFWorkbook workbook = new SXSSFWorkbook(lists.size()); SXSSFSheet sheet = workbook.createSheet(fileName.substring(0,fileName.indexOf(".xls"))); Integer rowIndex = 0; Row row = null; Cell cell = null; for(List<String> rowData: lists ){ Integer columnIndex = 0; row = sheet.createRow(rowIndex++); for(String columnVal:rowData){ cell = row.createCell(columnIndex++); cell.setCellValue(columnVal); } } pwrite(response,workbook,fileName); } private void pwrite(HttpServletResponse response,Workbook workbook,String fileName){ response.setCharacterEncoding("UTF-8"); response.setContentType("application/vnd.ms-excel;charset=UTF-8"); try { response.addHeader("Content-Disposition", "attachment; filename="+new String(fileName.getBytes("UTF-8"),"ISO8859-1")); } catch (UnsupportedEncodingException e) { e.printStackTrace(); fileName= UUID.randomUUID().toString()+".xls"; response.addHeader("Content-Disposition", "attachment; filename="+fileName); } try { workbook.write(response.getOutputStream()); } catch (IOException e) { e.printStackTrace(); } }}

有了这个工具类就可以实现Excel导出了，代码不难，这里就不多解释了。

在SpringBoot项目中编写一个导出Excel的Controller，并继承上面的ExportAbstractUtil，给出一个接口用作测试：

package com.csdn.myboot.controller;import com.csdn.myboot.utils.ExportAbstractUtil;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;import javax.servlet.http.HttpServletResponse;import java.util.ArrayList;import java.util.Arrays;import java.util.List;/** * @author haozz * @date 2018/6/6 10:14 * @description **/@Controller@RequestMapping(value = "/index")public class HelloCtrl extends ExportAbstractUtil{ @RequestMapping(value = "/testExcelOutPut") @ResponseBody public void testExcelOutPut(HttpServletResponse response){ //拼接数据start List<List<String>> lists = new ArrayList<List<String>>(); String rows[] = {"year","month","day"}; List<String> rowsTitle = Arrays.asList(rows); lists.add(rowsTitle); for(int i = 0; i<=9;i++){ String [] rowss = {"1","2","3"}; List<String> rowssList = Arrays.asList(rowss); lists.add(rowssList); } //拼接数据end write(response,lists,"导出Excel.xls"); }}

浏览器输入链接：

http://localhost:8099/index/testExcelOutPut

即可自动下载测试数据组成的Excel：

总结

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