ftpClient的连接超时设置

FTPClient ftpClient = new FTPClient();
 ftpClient.setConnectTimeout(10*1000); // 10s，如果超过就判定超时了
 ftpClient.connect(hostName, 21);

http://commons.apache.org/proper/commons-net/apidocs/org/apache/commons/net/SocketClient.html#setConnectTimeout(int)

Class org.apache.commons.net.SocketClient

void	setConnectTimeout(int connectTimeout) Sets the connection timeout in milliseconds, which will be passed to the Socket object's connect() method.

/**
     * 登录FTP服务器
     * 
     * @param host
     *            FTP主机地址
     * @param port
     *            FTP主机端口
     * @param username
     *            用户名
     * @param password
     *            密码
     * @throws Exception
     *             登录失败
     */
    public void ftpLogin(String host, int port, String username, String password)
            throws Exception {
        client = new FTPClient();
        // 设定连接超时时间
        client.setConnectTimeout(10*1000);
        try {
            client.connect(host, port);
            client.login(username, password);
            replyCode = client.getReplyCode();
            if (!FTPReply.isPositiveCompletion(replyCode)) {
                reply = client.getReplyString().trim();
                throw new Exception("FTP 登录失败，响应消息:" + reply);
            }
            log.info("FTP 登录成功");

            // 设置缓冲区
            client.setBufferSize(BufferSize);
            // 设置传输模式
            // client.setFileType(FTP.BINARY_FILE_TYPE);
        } catch (Exception e) {
            log.error(e.getMessage(), e);
            throw new Exception("FTP 登录失败");
        }
    }