文件导出下载

////文件导出
       //@ResponseBody
       @GetMapping("/execl")
       @RequiresPermissions("studentmanage:studentinfo:execl")
       public void execl(@RequestParam Map<String, Object> params ,
               HttpServletRequest request, HttpServletResponse response) throws Exception{
           //查询列表数据
       UserDO user=getUser();
   String hallId=user.getHallId();
   if(1!=getUserId().intValue()) {
       if(hallId != null&&hallId!="") {
           params.put("hallId", hallId);
       }else {
           //return null;
       }
   }
   params.put("flag", "1");
           params.put("limit", "40");
           params.put("offset", "0");
           Query query = new Query(params);
           List<StudentVO> financeList = studentService.list(query);
           //
           String fileName="学生信息";
//           response.setContentType("application/excel");
//           response.setHeader("Content-disposition","attachment;filename=" + fileName +";filename*=utf-8''"+ URLEncoder.encode(fileName,"UTF-8"));
           HSSFWorkbook wb = new HSSFWorkbook();
       // 第二步，在webbook中添加一个sheet,对应Excel文件中的sheet
       HSSFSheet sheet = wb.createSheet("学生信息");
       // 第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制short
       HSSFRow row = sheet.createRow((int) 0);
       // 第四步，创建单元格，并设置值表头设置表头居中
       HSSFCellStyle style = wb.createCellStyle();
       //style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 创建一个居中格式
       HSSFCell cell = row.createCell((short) 0);
       cell.setCellValue("序号");
       cell = row.createCell((short) 1);
       cell.setCellValue("学员姓名");
       cell = row.createCell((short) 2);
       cell.setCellValue("道馆名称");
       cell = row.createCell((short) 3);
       cell.setCellValue("班级名称");
       cell = row.createCell((short) 4);
       cell.setCellValue("级别名称");
       cell = row.createCell((short) 5);
       cell.setCellValue("性别");
       cell = row.createCell((short) 6);
       cell.setCellValue("联系方式");
       cell = row.createCell((short) 7);
       cell.setCellValue("协议人");
       cell = row.createCell((short) 8);
       cell.setCellValue("报名日期");
       cell = row.createCell((short) 9);
       cell.setCellValue("加入方式");
       cell = row.createCell((short) 10);
       cell.setCellValue("所属学校");

       // 第五步，写入实体数据实际应用中这些数据从数据库得到，
       for(int i=0;i<financeList.size();i++){
           StudentVO map =(StudentVO)financeList.get(i);
       // 第四步，创建单元格，并设置值
       row = sheet.createRow((int) i+1);
       HSSFCell celli = row.createCell((short) 0);
       row.createCell((short) 0).setCellValue(i);
       if(map.getStudentName()!=null)//学员姓名
       row.createCell((short) 1).setCellValue((String) map.getStudentName());
       if(map.getHallName()!=null)//道馆名称
       row.createCell((short) 2).setCellValue((String) map.getHallName());
       if(map.getClassName()!=null)//班级名称
       row.createCell((short) 3).setCellValue((String) map.getClassName());
       if(map.getLevelName()!=null)//级别名称
       row.createCell((short) 4).setCellValue((String) map.getLevelName());
       if(map.getStudentSex()!=null)//性别
           row.createCell((short) 5).setCellValue((String) map.getStudentSex()=="0"?"男":"女");
       if(map.getStudentContact()!=null)//联系方式
           row.createCell((short) 6).setCellValue((String) map.getStudentContact());
           if(map.getStudentFiduciary()!=null)//协议人
           row.createCell((short) 7).setCellValue((String) map.getStudentFiduciary());
           if(map.getStudentRegistDate()!=null)//报名时间
           row.createCell((short) 8).setCellValue( map.getStudentRegistDate().toLocaleString());
           if(map.getStudentJoinMethod()!=null)//加入方式
           row.createCell((short) 9).setCellValue((String) map.getStudentJoinMethod());
           if(map.getStudentSchool()!=null)//所属学校
               row.createCell((short) 10).setCellValue((String) map.getStudentSchool());
       }



       ByteArrayOutputStream os = new ByteArrayOutputStream();
   try {
   wb.write(os);
   } catch (IOException e) {
   e.printStackTrace();
   }
   byte[] content = os.toByteArray();
   InputStream is = new ByteArrayInputStream(content);
   // 设置response参数，可以打开下载页面
   response.reset();
   response.setContentType("application/vnd.ms-excel;charset=utf-8");
   response.setHeader("Content-Disposition", "attachment;filename="+ new String((fileName + ".xls").getBytes(), "iso-8859-1"));
   ServletOutputStream out = response.getOutputStream();
   BufferedInputStream bis = null;
   BufferedOutputStream bos = null;
   try {
   bis = new BufferedInputStream(is);
   bos = new BufferedOutputStream(out);
   byte[] buff = new byte[2048];
   int bytesRead;
   // Simple read/write loop.
   while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
   bos.write(buff, 0, bytesRead);
   }
   } catch (final IOException e) {
   throw e;
   } finally {
   if (bis != null)
   bis.close();
   if (bos != null)
   bos.close();
   }


       }

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