InetAddress类表示IP地址

package getIpAddress;


import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.UnknownHostException;

public class GetByName {
  public static void main(String[] args){
    
    String hostAddress="www.google.cn";
    
    //InputStreamReader可以将二进制流转化为字符流，使用最为频繁。
    BufferedReader bfr=new BufferedReader(new InputStreamReader(System.in));
    
    try {
      hostAddress=bfr.readLine();
    } catch (IOException e1) {
      e1.printStackTrace();
    }

    try {
      //InetAddress没有公共构造函数
      InetAddress net=InetAddress.getByName(hostAddress);
      //获得地址组
      InetAddress[] addrs=InetAddress.getAllByName(hostAddress);
        
      System.out.println(net);
      //result:[url]www.google.com/64.233.189.104[/url]
      for(int i=0;i<addrs.length;i++){
        System.out.println(addrs[i]);
      }
      //result:[url]www.google.com/64.233.189.104[/url]
      //         [url]www.google.com/64.233.189.147[/url]
      //         [url]www.google.com/64.233.189.99[/url]
        
      InetAddress inet=InetAddress.getLocalHost();
      System.out.println(inet);
      //result:fdu-hjh/10.11.13.128
        
    } catch (UnknownHostException e) {
      System.out.println("Cann't find host:"+hostAddress);
    }
    
    
  }
}