获得ip

实现方式很简单，就是读取网页而已。好多网站提供ip地址查询，这里用ip138测试。

[java] view plain copy print ?

1. public static void main(String[] args) { 
2.         try { 
3.             URL url = new URL("http://iframe.ip138.com/ic.asp"); 
4.             BufferedReader br = new BufferedReader(new InputStreamReader(url 
5.                     .openStream(), "gbk")); 
6.             String s = ""; 
7.             StringBuffer sb = new StringBuffer(""); 
8.             String ip = ""; 
9.             while ((s = br.readLine()) != null) { 
10.                 if (s.contains("[") && s.contains("]")) { 
11.                     sb.append(s); 
12.                 } 
13.             } 
14.             br.close(); 
15.             ip = sb.toString(); 
16.             System.out.println(ip); 
17.  
18.         } catch (Exception e) { 
19.             e.printStackTrace(); 
20.         } 
21.  
22.     } 

public static void main(String[] args) {
		try {
			URL url = new URL("http://iframe.ip138.com/ic.asp");
			BufferedReader br = new BufferedReader(new InputStreamReader(url
					.openStream(), "gbk"));
			String s = "";
			StringBuffer sb = new StringBuffer("");
			String ip = "";
			while ((s = br.readLine()) != null) {
				if (s.contains("[") && s.contains("]")) {
					sb.append(s);
				}
			}
			br.close();
			ip = sb.toString();
			System.out.println(ip);

		} catch (Exception e) {
			e.printStackTrace();
		}

	}

会输入你本地对外的ip的