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
责任编辑：小草
