JAVA批量下载

1.  根据数据库数据批量生成文件。

2. 通过poi包生成excel

3. 通过word模版，替换参数，生成word

4. 将文件打包下载

5. workspace: UTF-8

@Override
   protected void doPost(HttpServletRequest request, HttpServletResponse response)
      throws IOException
   {
      try
      {
         Cred cred = validate(request);
         
         int confId = validateConfId(request);

         List<Object[]> exportPartsData = null;
         List<Object[]> exportUsersData = null;
         ConferenceDAO confDao = getConfById(confId);
         if(confDao != null)
         {
            exportPartsData = this.getExportParticipantData(request, cred, confDao);
            exportUsersData = this.getExportUsersData(request, cred, confDao);
         }
         //excel file
         String exportExcelFileName = this.getExportExcelFileName(confDao.getConfName(), confDao.getStartTime());
         generateExcel(response, exportPartsData, exportUsersData, exportExcelFileName);
         //word file
         String exportWrodFileName = this.getExportWordFileName(confDao.getConfName(), confDao.getStartTime());
         generateWord(response, confDto, exportWrodFileName);
         //zip file
         String fileName = getExportFileName(confDao.getConfName());
         downloadZipFile(request, response, fileName, exportExcelFileName, exportWrodFileName);
      }
      catch (Throwable ex)
      {
         String msg = "Failed to export data from video system";
         log.error(msg, ex);
         response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
               "Failed to export data from video system.");
         return;
      }
   }

protected void generateExcel(HttpServletResponse response, List<Object[]> parts, List<Object[]> users, String fileName)
      throws IOException
   {

//import org.apache.poi.hssf.usermodel.HSSFCell;
//import org.apache.poi.hssf.usermodel.HSSFRow;
//import org.apache.poi.hssf.usermodel.HSSFSheet;
//import org.apache.poi.hssf.usermodel.HSSFWorkbook;
//import org.apache.poi.xwpf.usermodel.XWPFDocument;
      HSSFWorkbook wb = new HSSFWorkbook();
      HSSFSheet sheet1 = wb.createSheet("会场参数");
      if(parts != null && parts.size() > 0)
      {
         for(int i=0; i<parts.size(); i++ )
         {
            HSSFRow row = sheet1.createRow(i);
            for(int j=0; j<7; j++)
            {
               HSSFCell cell = row.createCell(j);
               cell.setCellValue(parts.get(i)[j] == null ? "" : parts.get(i)[j].toString());
            }
         }
      }
      
      HSSFSheet sheet2 = wb.createSheet("通讯录");
      if(users != null && users.size() > 0)
      {
         for(int i=0; i<users.size(); i++ )
         {
            HSSFRow row = sheet2.createRow(i);
            for(int j=0; j<5; j++)
            {
               HSSFCell cell = row.createCell(j);
               cell.setCellValue(users.get(i)[j] == null ? "" : users.get(i)[j].toString());
            }
         }
      }
      
      FileOutputStream xls = new FileOutputStream(fileName);
      try
      {
         wb.write(xls);
         xls.flush();
      }
      catch (Exception e)
      {
         String msg = "generate excel fail the fileName: " + fileName;
         log.error(msg, e);
         throw new RuntimeException(e);
      }
      finally
      {
         xls.close();
      }
   }

protected void generateWord(HttpServletResponse response, ConferenceDTO confDto, String fileName)
         throws IOException
   {
      Map<String, Object> param = new HashMap<String, Object>();
      param.put("${dept}", confDto.getDepartment() == null ? "" : confDto.getDepartment().getName());
      param.put("${confName}", confDto.getConfName());
      param.put("${startTime}", TimeUtil.format(confDto.getStartTime()));
      param.put("${speakParty}", confDto.getSpeakParty());

      //................................................

      if(confDto.isIncludePT())
      {
         if(confDto.getInteractive() == 0)
         {
            param.put("${confMode1}", "有");
         }
         else if(confDto.getInteractive() == 1)
         {
            param.put("${confMode3}", "有");
         }
         else
         {
            param.put("${confMode1}", "");
         }
      }
 
      XWPFDocument doc = null;
      OutputStream xls = null;
      try
      {
         doc = WordUtil.generateWord(param,"d:/technicalSupportNotice.docx");
         xls = new FileOutputStream(fileName);
         doc.write(xls);
         xls.flush();
      }
      catch (Exception e)
      {
         String msg = "generate word fail the fileName: " + fileName;
         log.error(msg, e);
         throw new RuntimeException(e);
      }
      finally
      {
         xls.close();
      }
   }

private void downloadZipFile(HttpServletRequest request, HttpServletResponse response, String fileName, String fileName1, String fileName2)
   {  

      //import org.apache.tools.zip.ZipEntry;
      //import org.apache.tools.zip.ZipOutputStream;
      ZipOutputStream zos = null;
      ByteArrayOutputStream baos = null;
      try
      {  
         baos = new ByteArrayOutputStream();
         
         zos = new ZipOutputStream(baos);
         zos.setEncoding("gbk");// very import
         Zip(fileName1, fileName2, zos);
         
         zos.closeEntry();
         zos.flush();
         zos.close();
         
         byte[] tba = baos.toByteArray();
         baos.flush();
         baos.close();
         
         response.reset();
         response.setContentType(DEFAULT_CONTENT_TYPE);
         response.addHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
         
         ServletOutputStream servletOS = response.getOutputStream();
         servletOS.write(tba);
         
         servletOS.flush();
         servletOS.close();
      }
      catch (FileNotFoundException e)
      {
         throw new UnsupportedOperationException("FileNotFoundException Exception", e);
      }
      catch (IOException e)
      {
         throw new UnsupportedOperationException("IOException Exception", e);
      }
      catch (Exception e)
      {
         throw new UnsupportedOperationException("Exception", e);
      }
      
   }
   
   private void Zip(String fileName1, String fileName2, ZipOutputStream out) throws IOException
   {
      File file1 = new File(fileName1);
      File file2 = new File(fileName2);
      if(file1.exists())
      {
         out.putNextEntry(new ZipEntry(file1.getName()));
         
         BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file1));
         
         int readLine = 0;
         int bufferSize = 1024 * 8;
         byte[] buffer = new byte[bufferSize];
         while((readLine = bis.read(buffer, 0 , bufferSize)) != -1)
         {
            out.write(buffer, 0, readLine);
         }
         
         bis.close();
      }
      
      if(file2.exists())
      {
         out.putNextEntry(new ZipEntry(file2.getName()));
         
         BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file2));
         
         int readLine = 0;
         int bufferSize = 1024 * 8;
         byte[] buffer = new byte[bufferSize];
         while((readLine = bis.read(buffer, 0 , bufferSize)) != -1)
         {
            out.write(buffer, 0, readLine);
         }
         
         bis.close();
      }
      
      //delete temp file
      if(file1.exists())
      {
         file1.delete();
      }
      
      if(file2.exists())
      {
         file2.delete();
      }
   }