Java获取网络主机信息

    java.net.InetAddress类表示互联网协议 （IP） 地址。

    有两个子类：Inet4Address， Inet6Address

    通过 InetAddress可以方便获取一个域名下的IP，也可以获取一个IP的主机名。

    下面是例子，通过程序查看51cto主机的IP信息，51cto是不让ping的。

    代码：

import java.io.IOException;
import java.net.InetAddress;

public class TestInetAddress {
        public static void main(String[] args) throws IOException {
                test();
        }

        public static void test() throws IOException {
                //获取本机的IP地址
                InetAddress address1 = InetAddress.getLocalHost();
                System.out.println(address1.getHostAddress());
                System.out.println(address1.toString());

                System.out.println("---------------");
                //获取51cot的IP地址
                InetAddress address2 = InetAddress.getByName("www.51cto.com");
                System.out.println("getHostAddress:\t" + address2.getHostAddress());
                System.out.println("getHostName:\t" + address2.getHostName());
                System.out.println("---------------");
                //获取我博客的IP地址
                InetAddress address3 = InetAddress.getByName("lavasoft.blog.51cto.com");
                System.out.println("getHostAddress:\t" + address3.getHostAddress());
                System.out.println("getHostName:\t" + address3.getHostName());
                //直接用ip地址构建
                System.out.println(InetAddress.getByName("211.103.156.224"));

                System.out.println("---------------");
                //获取www.google.com域名下所有的IP地址
//                InetAddress[] address4 = InetAddress.getAllByName("www.microsoft.com");
                InetAddress[] address4 = InetAddress.getAllByName("www.google.com");
                for (InetAddress address : address4) {
//                                System.out.println(address.getHostAddress());
                        System.out.println(address);
                }

                InetAddress address5 = InetAddress.getByName("211.103.156.229");
                System.out.println(address5.isReachable(10));
        }
}

    运行输出结果：

192.168.1.2
lavasoft/192.168.1.2
---------------
getHostAddress:  211.103.156.229
getHostName:  www.51cto.com
---------------
getHostAddress:  211.103.156.224
getHostName:  lavasoft.blog.51cto.com
/211.103.156.224
---------------
www.google.com/64.233.189.99
www.google.com/64.233.189.104
www.google.com/64.233.189.147
false

Process finished with exit code 0