FTPClient 下载文件

   
    /**
     * 下载文件到指定目录
     * @param filePath String
     * @param response HttpServletResponse
     * @throws ApplicationException
     */
    public void downloadFileToClient(String fileName,String webDirectoryAndFileName) throws Exception{
       FTPClient ftpClient = new FTPClient();

       InputStream is = null;
       FileOutputStream os = null;
      
       try {
          /*建立连接*/
       server = SystemParameter.getParameterValue("SYS_IDC_FTP_HOST");
           user = SystemParameter.getParameterValue("SYS_IDC_FTP_USER");
           password = SystemParameter.getParameterValue("SYS_IDC_FTP_PASSWORD");
          port = SystemParameter.getParameterValue("SYS_IDC_FTP_PORT");
          String workHome = SystemParameter.getParameterValue("SYS_IDC_FTP_WORK_HOME");
          ftpClient.connect(server);
          ftpClient.login(user, password); 

          String remoteFileName = workHome+"/"+fileName;
        
          boolean Flag= findName(remoteFileName);
          if(!Flag)
          {
             throw new ApplicationException("没找到您所下载的文件，请检查文件名是否正确");
          }
          // 设置文件的传输类型，默认是ASCII，修改为二进制 
          ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
          ftpClient.enterLocalPassiveMode(); 
         
          is = ftpClient.retrieveFileStream(remoteFileName); 
          File outfile = new File(webDirectoryAndFileName);
          os = new FileOutputStream(outfile);
         
          byte[] bytes = new byte[1024];
          int c;
          while ((c = is.read(bytes)) > 0)
          {
              os.write(bytes, 0, c);
          }
    
       } catch (IOException e) {
           e.printStackTrace();
           throw new RuntimeException("FTP客户端出错！", e);
       }
      finally
      {
    if (is != null)
    is.close();
    if (os != null)
    os.close();
         ftpClient.logout();
         ftpClient.disconnect();
      }

    }

-------------
/**
     * 下载文件
     * @param filePath String
     * @param response HttpServletResponse
     * @throws ApplicationException
     */
    public void downloadFile(String fileName,OutputStream out) throws Exception{
       FTPClient ftpClient = new FTPClient();

       try {
          /*建立连接*/
       server = SystemParameter.getParameterValue("SYS_IDC_FTP_HOST");
           user = SystemParameter.getParameterValue("SYS_IDC_FTP_USER");
           password = SystemParameter.getParameterValue("SYS_IDC_FTP_PASSWORD");
          port = SystemParameter.getParameterValue("SYS_IDC_FTP_PORT");
          String workHome = SystemParameter.getParameterValue("SYS_IDC_FTP_WORK_HOME");
          ftpClient.connect(server);
          ftpClient.login(user, password); 
          String remoteFileName = workHome+"/"+fileName;
          
          boolean Flag= findName(remoteFileName);
           if(!Flag)
           {
              throw new ApplicationException("没找到您所下载的文件，请检查文件名是否正确");
           }
           //设置文件类型（二进制）
           ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
           ftpClient.retrieveFile(remoteFileName, out);
          
       } catch (IOException e) {
           e.printStackTrace();
           throw new RuntimeException("FTP客户端出错！", e);
       }
      finally
      {
         ftpClient.logout();
         ftpClient.disconnect();
      }

    }
--------

   /**
    * 建立FTP连接
    * @param server String
    * @param user String
    * @param password String
    * @param path String
    */
   private void connectServer(String server,String user,String password,String port) throws Exception{
      ftpClient = new FTPClient();
       try {    
          if(port!=null && port.length()>0)
          {
           int ftpPort = Integer.parseInt(port);
         
           ftpClient.connect(server,ftpPort);
           int reply = ftpClient.getReplyCode();
           if(!FTPReply.isPositiveCompletion(reply)) {
               ftpClient.disconnect();
               throw new Exception("ftp 服务器拒绝连接");
           }
           ftpClient.login(user,password);
           log.info("你已成功连接到"+server+"服务器"+"\n");
           log.info("端口是"+ftpPort+"\n");     
          }
       } catch (IOException ex) {
           throw new Exception(ex);
       }
   }

   /**
    * 关闭连接
    * @throws ApplicationException
    */
   private void closeConnect() throws ApplicationException{
    try {
        ftpClient.logout();
        ftpClient.disconnect();
        log.info("正常退出文件服务器");
    } catch (IOException ex) {
        throw new ApplicationException(ex);
    }
   }


------
  /**
    * 上传文件
    * @param uploadFile File
    * @param outputPath String
    * @return boolean
    * @throws ApplicationException
    */
   public void fileUpload(String path,String outPutName) throws Exception{

      FTPClient ftpClient = new FTPClient();
      FileInputStream fis = null;

      try {
         /*建立连接*/
         server = SystemParameter.getParameterValue("SYS_IDC_FTP_HOST");
         if(server==null || "".equals(server)){
        server = "**";
         }
         user = SystemParameter.getParameterValue("SYS_IDC_FTP_USER");
         if(user==null || "".equals(user)){
        user = "**";
         }
         password = SystemParameter.getParameterValue("SYS_IDC_FTP_PASSWORD");
         if(password==null || "".equals(password)){
        password = "**";
         }
         port = SystemParameter.getParameterValue("SYS_IDC_FTP_PORT");
         if(port==null || "".equals(port)){
        port = "21";
         }
         String workHome = SystemParameter.getParameterValue("SYS_IDC_FTP_WORK_HOME");
         if(workHome==null || "".equals(workHome)){
        workHome = "/idcfile2";
         }
         ftpClient.connect(server,Integer.valueOf(port));
         ftpClient.login(user, password);

          File srcFile = new File(path);
          fis = new FileInputStream(srcFile);
          //设置文件类型（二进制）
          ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
          //String currentPath = creatOutputPath(outPutName);
          String currentPath = workHome+"/"+outPutName;
          ftpClient.changeWorkingDirectory(path);
          ftpClient.storeFile(currentPath, fis);
          fis.close();
          ftpClient.logout();
          ftpClient.disconnect();
      } catch (IOException e) {
          e.printStackTrace();
          throw new RuntimeException("FTP客户端出错！", e);
      }
   }