Java FTPClient.logout方法代码示例

import org.apache.commons.net.ftp.FTPClient; //导入方法依赖的package包/类
public static byte[] download(String url, int port, String username, String password, String remotePath,
		String fileName) throws IOException {
	FTPClient ftp = new FTPClient();
	ftp.setConnectTimeout(5000);
	ftp.setAutodetectUTF8(true);
	ftp.setCharset(CharsetUtil.UTF_8);
	ftp.setControlEncoding(CharsetUtil.UTF_8.name());
	try {
		ftp.connect(url, port);
		ftp.login(username, password);// 登录
		if (!FTPReply.isPositiveCompletion(ftp.getReplyCode())) {
			ftp.disconnect();
			throw new IOException("login fail!");
		}
		ftp.changeWorkingDirectory(remotePath);
		ftp.setFileType(FTPClient.BINARY_FILE_TYPE);
		FTPFile[] fs = ftp.listFiles();
		for (FTPFile ff : fs) {
			if (ff.getName().equals(fileName)) {
				try (ByteArrayOutputStream is = new ByteArrayOutputStream();) {
					ftp.retrieveFile(ff.getName(), is);
					byte[] result = is.toByteArray();
					return result;
				}
			}
		}

		ftp.logout();
	} finally {
		if (ftp.isConnected()) {
			ftp.disconnect();
		}
	}
	return null;
}
 

import org.apache.commons.net.ftp.FTPClient; //导入方法依赖的package包/类
public static boolean downloadFile(String url, int port, String username, String password,
                                   String remotePath, String fileName, String localPath) {
    boolean success = false;
    FTPClient ftp = new FTPClient();
    try {
        int reply;
        ftp.connect(url, port);
        ftp.login(username, password);
        reply = ftp.getReplyCode();
        if (!FTPReply.isPositiveCompletion(reply)) {
            ftp.disconnect();
            return success;
        }
        ftp.changeWorkingDirectory(remotePath);
        FTPFile[] fs = ftp.listFiles();
        System.out.println(fs.length);
        for (FTPFile ff : fs) {
            System.out.println(ff.getName());
            if (ff.getName().equals(fileName)) {
                File localFile = new File(localPath + "/" + ff.getName());
                OutputStream is = new FileOutputStream(localFile);
                ftp.retrieveFile(ff.getName(), is);
                is.close();
            }
        }
        ftp.logout();
        success = true;
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (ftp.isConnected()) {
            try {
                ftp.disconnect();
            } catch (IOException ioe) {
            }
        }
    }
    return success;
}
 

import org.apache.commons.net.ftp.FTPClient; //导入方法依赖的package包/类
/**
 * Logout and disconnect the given FTPClient. *
 * 
 * @param client
 * @throws IOException
 */
private void disconnect(FTPClient client) throws IOException {
  if (client != null) {
    if (!client.isConnected()) {
      throw new FTPException("Client not connected");
    }
    boolean logoutSuccess = client.logout();
    client.disconnect();
    if (!logoutSuccess) {
      LOG.warn("Logout failed while disconnecting, error code - "
          + client.getReplyCode());
    }
  }
}
 

import org.apache.commons.net.ftp.FTPClient; //导入方法依赖的package包/类
/**
 * Description: 向FTP服务器上传文件
 * @param url FTP服务器hostname
 * @param port FTP服务器端口
 * @param username FTP登录账号
 * @param password FTP登录密码
 * @param path FTP服务器保存目录
 * @param filename 上传到FTP服务器上的文件名
 * @param input 输入流
 * @return 成功返回true，否则返回false
 */
public static boolean uploadFile(String url,int port,String username, String password, String path, String filename, InputStream input) {
	boolean success = false;
	FTPClient ftp = new FTPClient();
	try {
		int reply;
		ftp.connect(url, 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
		ftp.login(username, password);//登录
		reply = ftp.getReplyCode();
		if (!FTPReply.isPositiveCompletion(reply)) {
			ftp.disconnect();
			return success;
		}
		//设置FTP以2进制传输
		ftp.setFileType(FTPClient.BINARY_FILE_TYPE);
		//TODO 读取文件配置判断是否使用主动
		ftp.enterLocalPassiveMode();//被动
		//ftp.enterLocalActiveMode();//主动
		//创建目录
		mkDir(path,ftp);
		//改变目录
		ftp.changeWorkingDirectory(path);
		ftp.storeFile(filename, input);			
		input.close();
		ftp.logout();
		success = true;
	} catch (IOException e) {
		e.printStackTrace();
	} finally {
		if (ftp.isConnected()) {
			try {
				ftp.disconnect();
			} catch (IOException ioe) {
			}
		}
	}
	return success;
}
 

import org.apache.commons.net.ftp.FTPClient; //导入方法依赖的package包/类
public FTPClient getNewFTPClient(Uri path, int mode) throws SocketException, IOException, AuthenticationException{

        // Use default port if not set
        int port = path.getPort();
        if (port<0) {
            port = 21; // default port
        }

        String username="anonymous"; // default user
        String password = ""; // default password

        NetworkCredentialsDatabase database = NetworkCredentialsDatabase.getInstance();
        Credential cred = database.getCredential(path.toString());
        if(cred!=null){
            password= cred.getPassword();
            username = cred.getUsername();
        }
        FTPClient ftp= new FTPClient();

        //try to connect
        ftp.connect(path.getHost(), port);
        //login to 	server
        if(!ftp.login(username, password))
        {
            ftp.logout();
            throw new AuthenticationException();
        }
        if(mode>=0){
            ftp.setFileType(mode);

        }
        int reply = ftp.getReplyCode();
        //FTPReply stores a set of constants for FTP reply codes. 
        if (!FTPReply.isPositiveCompletion(reply))
        {
            try {
                ftp.disconnect();
            } catch (IOException e) {
                throw e;
            }
            return null;
        }
        //enter passive mode
        ftp.enterLocalPassiveMode();

        return ftp;
    }
 

import org.apache.commons.net.ftp.FTPClient; //导入方法依赖的package包/类
/**
 * 执行FTP回调操作的方法
 *
 * @param <T>      the type parameter
 * @param callback 回调的函数
 * @return the t
 * @throws IOException the io exception
 */
public <T> T execute(FTPClientCallback<T> callback) throws IOException {
    FTPClient ftp = new FTPClient();
    try {
        //登录FTP服务器
        try {
            //设置超时时间
            ftp.setDataTimeout(7200);
            //设置默认编码
            ftp.setControlEncoding(DEAFULT_REMOTE_CHARSET);
            //设置默认端口
            ftp.setDefaultPort(DEAFULT_REMOTE_PORT);
            //设置是否显示隐藏文件
            ftp.setListHiddenFiles(false);
            //连接ftp服务器
            if (StringUtils.isNotEmpty(port) && NumberUtils.isDigits(port)) {
                ftp.connect(host, Integer.valueOf(port));
            } else {
                ftp.connect(host);
            }
        } catch (ConnectException e) {
            logger.error("连接FTP服务器失败：" + ftp.getReplyString() + ftp.getReplyCode());
            throw new IOException("Problem connecting the FTP-server fail", e);
        }
        //得到连接的返回编码
        int reply = ftp.getReplyCode();

        if (!FTPReply.isPositiveCompletion(reply)) {
            ftp.disconnect();
        }
        //登录失败权限验证失败
        if (!ftp.login(getUsername(), getPassword())) {
            ftp.quit();
            ftp.disconnect();
            logger.error("连接FTP服务器用户或者密码失败：：" + ftp.getReplyString());
            throw new IOException("Cant Authentificate to FTP-Server");
        }
        if (logger.isDebugEnabled()) {
            logger.info("成功登录FTP服务器：" + host + " 端口：" + port);
        }
        ftp.setFileType(FTPClient.BINARY_FILE_TYPE);
        //回调FTP的操作
        return callback.doTransfer(ftp);
    } finally {
        //FTP退出
        ftp.logout();
        //断开FTP连接
        if (ftp.isConnected()) {
            ftp.disconnect();
        }
    }
}