Java中实现简单的Excel导出

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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