上传下载文件的两个servlet

这是自己之前做文件上传的例子，写给自己看的:

upload:

 

  public void doService(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
     response.setCharacterEncoding("UTF-8");
  request.setCharacterEncoding("UTF-8");

  PrintWriter out = response.getWriter();
  
        try {
      String fileValidateClass = request.getParameter("fileValidateClass");
      String fileUploadPath = request.getParameter("fileUploadPath");

      if (fileUploadPath == null || fileUploadPath.equals("")) {
       ConfigurationService c = (ConfigurationService) Context.getBean("configurationService");
       String uploadPath = c.getConfigtationValue("configuration.file.upload.path");
       
       fileUploadPath = FileUtils.getRealPath(request, "/" + uploadPath);
      }

   File fileParent = new File(fileUploadPath);
   if (!fileParent.exists()) {
    fileParent.mkdirs();
   }
   
   DiskFileItemFactory dfif = new DiskFileItemFactory();
   dfif.setSizeThreshold(DEFAULT_SIZE_THRESHOLD);
   dfif.setRepository(new File(fileUploadPath));

   
   ServletFileUpload sfu = new ServletFileUpload(dfif);
   sfu.setSizeMax(DEFAULT_SIZE_MAX);
   List<FileItem> fileItems = sfu.parseRequest(request);
      
   
      if (fileValidateClass != null && !fileValidateClass.equals("")) {
    UploadValidation fileValidate = null;
    try {
     fileValidate = (UploadValidation) Class.forName(
       fileValidateClass).newInstance();
    } catch (ClassNotFoundException e) {
     throw new ClassNotFoundException("Can't find Class:" + fileValidateClass);
    }
    
    String validateinfo = fileValidate.validateFilename(fileItems, fileUploadPath);
    if (validateinfo == null || validateinfo.equals("")) {
     throw new Exception(validateinfo);
    }
   }
           
            String realFile = null;
   String shortName = null;
   String fileNameInSession = "";
   
            for (FileItem fileItem : fileItems) {
    shortName = fileItem.getName().substring(
      fileItem.getName().lastIndexOf("\\") + 1,
      fileItem.getName().length());
    fileNameInSession = request.getSession().getId() + System.currentTimeMillis();
    realFile = fileUploadPath + System.getProperty("file.separator") + fileNameInSession + "_" + shortName;
    fileItem.write(new java.io.File(realFile));
    
    request.getSession().setAttribute("fileNameInSession", fileNameInSession);
            }
           
            out.print("{success:true,realFile:'"+fileNameInSession+"'}");
        } catch (Exception e) {
            logger.error(e);
            out.print("{error:'"+e.getMessage()+"'}");
        }
        out.close();
    }

 

 

download:

 

public void doService(HttpServletRequest request,
   HttpServletResponse response) throws ServletException, IOException {
  
  response.setCharacterEncoding("UTF-8");
  request.setCharacterEncoding("UTF-8");

  OutputStream o = response.getOutputStream();

  String fileName = request.getParameter("fileName");
  String romotefileInfo = request.getParameter("romotefileInfo");

  if (fileName != null) {
   try {
    String uploadPath = request.getParameter("uploadPath");
    String downloadPath = "";
    if (uploadPath == null || uploadPath.trim().equals("")) {
     ConfigurationService c = (ConfigurationService) Context.getBean("configurationService");
     uploadPath = c.getConfigtationValue("configuration.file.upload.path");
     downloadPath = FileUtils.getRealPath(request, "/" + uploadPath);
    } else {
     downloadPath = uploadPath;
    }
    
    //download file from hard driver
    String pathname = downloadPath + fileName;
    File fileLoad = new File(pathname);

    int index = fileName.indexOf("_");
    String name = fileName.substring(index + 1);

    response.setHeader("Content-disposition", "attachment;filename=" + "" + name + "");
    response.setContentType("text/plain");
    
    long fileLength = fileLoad.length();
    String length = String.valueOf(fileLength);
    response.setHeader("Content_Length", length);
    
    // download the file.
    FileInputStream in = new FileInputStream(fileLoad);
    int n = 0;
    byte b[] = new byte[1024];
    while ((n = in.read(b)) != -1) {
     o.write(b, 0, n);
    }
   } catch (Exception e) {
    logger.error(e);
    o.write(new String("errro to download file").getBytes());
   }
   o.close();
  } else if (romotefileInfo != null) {
   try {
    //download file from database
    String filedownRemoteClass = request
      .getParameter("filedownClass");
    DownLoadFromRemote downLoadFromRemote = (DownLoadFromRemote) Class
      .forName(filedownRemoteClass).newInstance();
    byte[] filecontents = downLoadFromRemote
      .getFileFromRemote(romotefileInfo);
    String[] filelist = romotefileInfo.split(";");
    String remotefileName = filelist[2];

    //get the short name
    int index = remotefileName.indexOf("_");
    String name = remotefileName.substring(index + 1);

    BufferedOutputStream stream = null;
    File file = new File(name);
    FileOutputStream fstream = new FileOutputStream(file);
    stream = new BufferedOutputStream(fstream);
    stream.write(filecontents);
    stream.flush();
    
    response.setHeader("Content-disposition", "attachment;filename=" + "" + name + "");
    response.setContentType("text/plain");
    
    // get the file length.
    long fileLength = file.length();
    String length = String.valueOf(fileLength);
    response.setHeader("Content_Length", length);
    
    // download the file.
    FileInputStream in = new FileInputStream(file);
    byte b[] = new byte[1024];
    int n = 0;
    while ((n = in.read(b)) != -1) {
     o.write(b, 0, n);
    }
   } catch (ClassNotFoundException e) {
    logger.error(e);
    o.write(new String("errro to download file: " + e.getMessage()).getBytes());
   } catch (InstantiationException e) {
    logger.error(e);
    o.write(new String("errro to download file: " + e.getMessage()).getBytes());
   } catch (IllegalAccessException e) {
    logger.error(e);
    o.write(new String("errro to download file: " + e.getMessage()).getBytes());
   } catch (Exception e) {
    logger.error(e);
    o.write(new String("errro to download file: " + e.getMessage()).getBytes());
   }
   
   o.close();
  }
 }