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

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