public static void main(String[] args) {
  　　try {
       InetAddress address = InetAddress.getLocalHost();//获取的是本地的IP地址 //PC-20140317PXKX/192.168.0.121
       String hostAddress = address.getHostAddress());//192.168.0.121      
       InetAddress address1 = InetAddress.getByName("www.wodexiangce.cn");//获取的是该网站的ip地址，比如我们所有的请求都通过nginx的，所以这里获取到的其实是nginx服务器的IP地 
       String hostAddress1 = address1.getHostAddress());//124.237.121.122 
       InetAddress[] addresses = InetAddress.getAllByName("www.baidu.com");//根据主机名返回其可能的所有InetAddress对象 
       for(InetAddress addr:addresses){ 
       System.out.println(addr);//www.baidu.com/14.215.177.38 
       //www.baidu.com/14.215.177.37 
      } 
    } catch (UnknownHostException e) { 
       e.printStackTrace();
   } 
 }

/**
   * 获取服务器IP地址
   * @return
   */
  @SuppressWarnings("unchecked")
  public static String getServerIp(){
    String SERVER_IP = null;
    try {
      Enumeration netInterfaces = NetworkInterface.getNetworkInterfaces();
      InetAddress ip = null;
      while (netInterfaces.hasMoreElements()) {
        NetworkInterface ni = (NetworkInterface) netInterfaces.nextElement();
        ip = (InetAddress) ni.getInetAddresses().nextElement();
        SERVER_IP = ip.getHostAddress();
        if (!ip.isSiteLocalAddress() && !ip.isLoopbackAddress()
            && ip.getHostAddress().indexOf(":") == -1) {
          SERVER_IP = ip.getHostAddress();
          break;
        } else {
          ip = null;
        }
      }
    } catch (SocketException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
  
    return SERVER_IP;
  }
}