org.apache.commons.net工具下 对ftp的简单操作

/**
	 * 连接ftp服务器
	 * @param ip	IP地址
	 * @param port	端口号
	 * @param username	用户名
	 * @param password	密码
	 * @param ftpPath	ftp子目录
	 * @throws IOException
	 */
	public int connectServer(String ip, int port, String username,
			String password, String ftpPath) throws IOException {
		system.out.println(this, "=============all_attributes==========="+"ip_"+ip+"port_"+port+"username_"+username+"password_"+password+"ftpPath_"+ftpPath);
		int reply;
		int connectFlag = 1;
		try {
			
			ftpClient.connect(ip, port);//连接FTP服务器    
			 //如果采用默认端口，可以使用ftp.connect(url)的方式直接连接FTP服务器
 			ftpClient.login(username, password);
 			reply = ftpClient.getReplyCode();
 			if(!FTPReply.isPositiveCompletion(reply)){
 				ftpClient.disconnect();
 				connectFlag = 0;
 				return connectFlag;
 			}
 			 ftpClient.changeWorkingDirectory(ftpPath);//转移到FTP服务器目录  
 			
			system.out.println(this, "=============connet_ftp_is_ok_falg_"+connectFlag+"===========");
		} catch (Exception e) {
			system.out.println(this, "=============connet_ftp_is_error"+connectFlag+"===========");
		}
			return connectFlag;
	}


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	/**
	 * upload 上传文件
	 * 
	 * @throws	 java.lang.Exception
	 * @return 	-1 文件不存在 -2 文件内容为空 >0 成功上传，返回文件的大小
	 * @param newname	上传后的新文件名
	 * @param filePath  上传的文件的路径
	 */
	public long upload(String localPath, String newFileName) throws Exception {
		long result = 0;
		
		try {
			File file = new File(localPath);
			if (!file.exists()) {
				result = -1;//文件不存在
			}
			if (file.length() == 0) {
				result = -2;//文件内容为空
			}
//			result = file.length(); 
			is = new FileInputStream(file);
			ftpClient.storeFile(newFileName, is); 
			ftpClient.logout();
			system.out.println(this, "========="+newFileName+"文件上传成功==========");
		}catch (Exception e) {
			e.printStackTrace();
			system.out.println(this, "========="+newFileName+"文件上传失败==========");
		}finally{
			
		} 
		return result;
	}
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/**
	 * 通过文件路径上传
	 * @param filePath
	 * @return
	 * @throws Exception
	 */
	public long upload(String filePath) throws Exception {
		String newname = "";
		if (filePath.indexOf("/") > -1) {
			newname = filePath.substring(filePath.lastIndexOf("/") + 1);
		} else {
			newname = filePath;
		}
		return upload(filePath, newname);
	}
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/**
	 * 
	 * closeServer
	 * 
	 * 断开与ftp服务器的链接
	 * 
	 * @throws java.io.IOException
	 */
	public void closeServer() throws IOException
	{
		try {
			if (is != null) {
				is.close();
			}
			if (ftpClient != null)
			{
				ftpClient.disconnect();
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
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/**
     * 读取文本文件.
     * 
     */
    public static String readTxtFile(File filePathAndName){
        String read;
        FileReader fileread;
        try {
            fileread = new FileReader(filePathAndName);
            bufread = new BufferedReader(fileread);
            try {
                while ((read = bufread.readLine()) != null) {
                    readStr = readStr + read+ "\r\n";
                }
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        System.out.println("文件内容是:"+ "\r\n" + readStr);
        return readStr;
    }
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    /**
     * 写文件.
     * 
     */
    public static void writeTxtFile(String newStr,File filePathAndName) throws IOException{
        //先读取原有文件内容，然后进行写入操作
        String filein = newStr + "\r\n" + readStr + "\r\n";
        RandomAccessFile mm = null;
        try {
            mm = new RandomAccessFile(filePathAndName, "rw");
            mm.writeBytes(filein);
        } catch (IOException e1) {
            // TODO 自动生成 catch 块
            e1.printStackTrace();
        } finally {
            if (mm != null) {
                try {
                    mm.close();
                } catch (IOException e2) {
                    // TODO 自动生成 catch 块
                    e2.printStackTrace();
                }
            }
        }
    }

----------------------------------------------------

/**
	 * 
	 * downloadFile
	 * 
	 * 下载ftp服务器的资源
	 * @param   remoteFileName  待下载文件名称
	 * @param  localDires 本里存放路径
	 * @param  ftpPath ftp服务器存放要下载文件的子目录
	 * 
	 * @throws java.io.IOException
	 */
    public  void downloadFile(String remoteFileName,String localDires , String ftpPath ) throws IOException{
        String strfilepath = localDires +"/"+ remoteFileName;    //写入地址 文件保存路径
        BufferedOutputStream bf = null;   
        boolean success=false;
       
        try { 
        	ftpClient.changeWorkingDirectory(ftpPath);
            bf= new BufferedOutputStream(new FileOutputStream(strfilepath));
            
            system.out.println(this, "========="+remoteFileName+"开始下载==========");
            
            success = ftpClient.retrieveFile(remoteFileName,bf);  //下载操作
//            ftpClient.logout();
            if(success==true)
            {
            	system.out.println(this, "========="+remoteFileName+"成功下载到=========="+localDires);
            }
            
        } catch (IOException e1) {
            // TODO 自动生成 catch 块
            e1.printStackTrace();
        } finally {
            if (null != bf) {
                try {
                	bf.flush();
                    bf.close();
                } catch (IOException e2) {
                    // TODO 自动生成 catch 块
                    e2.printStackTrace();
                }
            }
        }
         if(success=false)
         {
        	 system.out.println(this, "========="+remoteFileName+"下载失败==========");
         }
    }
    
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