SpringBoot 实现用户下载Excel文件

项目中经常会使用到导出各种报表之类的操作，java中POI能够帮助我们操作Excel表格，实现对数据的写入和计算操作，最终导出到用户本地机器上。下面就给大家介绍一下SpringBoot中导出Excel的具体实现！

首先导入POI依赖

<!-- 导入POI，操作excel需要的依赖 -->
<dependency>
	 <groupId>org.apache.poi</groupId>
	 <artifactId>poi-ooxml</artifactId>
	 <version>3.9</version>
</dependency>

导出Excel帮助类

public class ExportHelper {
     
    /**
     * 导出浏览器
     *
     * @param fileName 文件名
     * @param workbook HSSFWorkbook对象
     */
    public void WriteResponse(String fileName, HSSFWorkbook workbook,
                              HttpServletRequest request, HttpServletResponse response) throws IOException {
     
        SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");//设置日期格式
        fileName = fileName + df.format(new Date());//获取当前系统时间
        fileName += ".xls";

        //解决下载文件时文件名乱码问题    给名称加上编码格式UTF-8
        byte[] fileNameBytes = fileName.getBytes(StandardCharsets.UTF_8);
        fileName = new String(fileNameBytes, 0, fileNameBytes.length, StandardCharsets.ISO_8859_1);
        
        //下载文件的默认名称
        response.setHeader("content-Type", "application/vnd.ms-excel");
        //告诉浏览器用什么软件可以打开此文件
        response.setHeader("content-disposition", "attachment; filename=" + fileName);
        workbook.write(response.getOutputStream());
    }


    /// 

    /// 导出Excel  将数据写入到workbook中
    /// 
    /// 
    public HSSFWorkbook ExportExcel(List<UserInfo> list) {
     
        try {
     
			//Excel实例
            HSSFWorkbook workbook = new HSSFWorkbook();
       		//表实例
            Sheet sheet1 = workbook.createSheet("Sheet1");
			
			 //创建行  标题行  下标（索引） 0
            Row row0 = sheet1.createRow(0);
            row0.createCell(0).setCellValue("序号");
            row0.createCell(1).setCellValue("姓名");
            row0.createCell(2).setCellValue("性别");
            row0.createCell(3).setCellValue("年龄");
            row0.createCell(4).setCellValue("身高");
            row0.createCell(5).setCellValue("爱好");


            //每一行数据
            for (int i = 0; i < list.size(); i++) {
     //行
            	//创建行  i+1是因为第一行已经被标题占了，所以这里从第二行开始，对应的下标为1
                Row row = sheet1.createRow(i + 1); 
                //创建单元格
                row.createCell(0).setCellValue(i+1);
                row.createCell(1).setCellValue(list.get(i).getUserName);
                row.createCell(2).setCellValue(list.get(i).getUserSex);
                row.createCell(3).setCellValue(list.get(i).getUserAge);
                row.createCell(4).setCellValue(list.get(i).getUserRise);
                row.createCell(5).setCellValue(list.get(i).getUserLike);
            }
            return workbook;
        } catch (Exception e) {
     
            e.printStackTrace();
            System.out.println("导出Excel错误信息：" + e.getMessage());
            throw e;
        }
    }
}

Controller调用 Excel导出实例

	/**
     * PanSatImage导出所有页数据
     * @param request
     * @param response
     * @throws IOException
     */
    @GetMapping(value = "/ExportPages")
    public void ExportPages(HttpServletRequest request,HttpServletResponse response) throws IOException {
     
        try
        {
     
            List<UserInfo> list = new ArrayList<>();
            UserInfo userInfo=new UserInfo();
            userInfo.setUserName("张三");
            userInfo.setUserSex("男");
            userInfo.setUserAge("20");
            userInfo.setUserRise("176");
            userInfo.setUserLike("唱歌");
			list.add(userInfo);
			UserInfo userInfo2=new UserInfo();
            userInfo2.setUserName("李四");
            userInfo.setUserSex("女");
            userInfo22.setUserAge("21");
            userInfo2.setUserRise("170");
            userInfo2.setUserLike("跳舞");
			list.add(userInfo2);
			UserInfo userInfo3=new UserInfo();
            userInfo3.setUserName("王五");
            userInfo3.setUserSex("男");
            userInfo3.setUserAge("23");
            userInfo3.setUserRise("178");
            userInfo3.setUserLike("打篮球");
			list.add(userInfo3);
            ExportHelper exportHelper=new ExportHelper();
            exportHelper.WriteResponse("文件名", exportHelper.ExportExcel(list),
            request,response);
        }
        catch (Exception e)
        {
     
            e.printStackTrace();
            throw e;
        }
    }