Java 实现Ping功能

一、纯Java实现ICMP的ping命令

?
二、JAVA调用外部EXE实现PING功能
?
三、ICMP Ping in Java(JDK 1.5 and above)
    利用Socket的connect(SocketAddress endpoint, int timeout)方法可以实现telnet的功能，如果catch到异常说明telnet失败  try  {           Socket server = new Socket();           InetSocketAddress address = new InetSocketAddress("192.168.0.113",                    8080);           server.connect(address, 5000);           server.close();        } catch (UnknownHostException e){            System.out.println("telnet失败");        } catch (IOException e){            System.out.println("telnet失败");        }
?