各种超时

            /**
             * *******************************************************************
             * 如果不设置超时，连接会一直占用本地线程，端口，连接客户端一多，阻塞在那里，会导致本地端口用尽及CPU压力
             */
            bootstrap.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 5000);

Socket socket = new Socket(); 
socket.connect(new InetSocketAddress(ipAddress, port), 1000);//设置连接请求超时时间1s socket.setSoTimeout(5000);//设置读操作超时时间5s

/**
     *  Enable/disable {@link SocketOptions#SO_TIMEOUT SO_TIMEOUT}
     *  with the specified timeout, in milliseconds. With this option set
     *  to a non-zero timeout, a read() call on the InputStream associated with
     *  this Socket will block for only this amount of time.  If the timeout
     *  expires, a <B>java.net.SocketTimeoutException</B> is raised, though the
     *  Socket is still valid. The option <B>must</B> be enabled
     *  prior to entering the blocking operation to have effect. The
     *  timeout must be {@code > 0}.
     *  A timeout of zero is interpreted as an infinite timeout.
     *
     * @param timeout the specified timeout, in milliseconds.
     * @exception SocketException if there is an error
     * in the underlying protocol, such as a TCP error.
     * @since   JDK 1.1
     * @see #getSoTimeout()
     */
    public synchronized void setSoTimeout(int timeout) throws SocketException {
        if (isClosed())
            throw new SocketException("Socket is closed");
        if (timeout < 0)
          throw new IllegalArgumentException("timeout can‘t be negative");

        getImpl().setOption(SocketOptions.SO_TIMEOUT, new Integer(timeout));
    }

DriverManager.setLoginTimeout(5);

/**
     * Sets the maximum time in seconds that a driver will wait
     * while attempting to connect to a database once the driver has
     * been identified.
     *
     * @param seconds the login time limit in seconds; zero means there is no limit
     * @see #getLoginTimeout
     */
    public static void setLoginTimeout(int seconds) {
        loginTimeout = seconds;
    }

CloseableHttpClient httpClient = HttpClients.createDefault();
HttpGet httpGet=new HttpGet("http://www.baidu.com");//HTTP Get请求
RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(5000).setConnectTimeout(3000).build();//设置请求和传输超时时间
httpGet.setConfig(requestConfig);

            HttpURLConnection con = (HttpURLConnection) object.openConnection();
            con.setConnectTimeout();
            con.setReadTimeout();