Java获取本机外网ip地址的方法

短命女 2022-06-14 03:58 576阅读 0赞

## Java获取外网IP地址的方法 ##

### 获取本地IP地址的方法 ###

public static String getLocalAddress(){
    	String ip = "";
    	try {
    		ip = InetAddress.getLocalHost().getHostAddress();
    	} catch (UnknownHostException e) {
    		// TODO Auto-generated catch block
    		e.printStackTrace();
    	}
    	return ip;
    }

### 获取外网本机的IP地址的方法 ###

一种可行的获取方法，是通过http请求从网站中取出ip字段。例如：[http://ip.chinaz.com/][http_ip.chinaz.com]

通过这个网址，加上简单的正则表达式，即可得到。

public static String getV4IP(){
    	String ip = "";
    	String chinaz = "http://ip.chinaz.com";
    	
    	StringBuilder inputLine = new StringBuilder();
    	String read = "";
    	URL url = null;
    	HttpURLConnection urlConnection = null;
    	BufferedReader in = null;
    	try {
    		url = new URL(chinaz);
    		urlConnection = (HttpURLConnection) url.openConnection();
    	    in = new BufferedReader( new InputStreamReader(urlConnection.getInputStream(),"UTF-8"));
    		while((read=in.readLine())!=null){
    			inputLine.append(read+"\r\n");
    		}
    		//System.out.println(inputLine.toString());
    	} catch (MalformedURLException e) {
    		e.printStackTrace();
    	} catch (IOException e) {
    		e.printStackTrace();
    	}finally{
    		if(in!=null){
    			try {
    				in.close();
    			} catch (IOException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    		}
    	}
    	
    	
    	Pattern p = Pattern.compile("\\<dd class\\=\"fz24\">(.*?)\\<\\/dd>");
    	Matcher m = p.matcher(inputLine.toString());
    	if(m.find()){
    		String ipstr = m.group(1);
    		ip = ipstr;
    		//System.out.println(ipstr);
    	}
    	return ip;
     } 参考博客： http://blog.csdn.NET/dugucanjian/article/details/47378063

[http_ip.chinaz.com]: http://ip.chinaz.com/