java 获取公网(外网IP）很实用！

package com.lovo.util;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class PublicInterIp {
/**
* @param args
* @throws Exception
*/
public String getPublicIp() {
try {
String path = "http://iframe.ip138.com/ic.asp";// 要获得html页面内容的地址

URL url = new URL(path);// 创建url对象

HttpURLConnection conn = (HttpURLConnection) url.openConnection();// 打开连接

conn.setRequestProperty("contentType", "GBK"); // 设置url中文参数编码

conn.setConnectTimeout(5 * 1000);// 请求的时间

conn.setRequestMethod("GET");// 请求方式

InputStream inStream = conn.getInputStream();
// readLesoSysXML(inStream);

BufferedReader in = new BufferedReader(new InputStreamReader(
inStream, "GBK"));
StringBuffer buffer = new StringBuffer();
String line = "";
// 读取获取到内容的最后一行,写入
while ((line = in.readLine()) != null) {
buffer.append(line);
}
String str = buffer.toString();
String ipString1 = str.substring(str.indexOf("["));
// 获取你的IP是中间的[182.149.82.50]内容
String ipsString2 = ipString1.substring(ipString1.indexOf("[") + 1,
ipString1.lastIndexOf("]"));
//获取当前IP地址所在地址
/*	String ipsString3=ipString1.substring(ipString1.indexOf(": "),ipString1.lastIndexOf("</center>"));
System.err.println(ipsString3);*/

// 返回公网IP值
return ipsString2;

} catch (Exception e) {
System.out.println("获取公网IP连接超时");
return "连接超时";
}
}
public static void main(String[] args)  {
PublicInterIp interIp=new PublicInterIp();
System.err.println(interIp.getPublicIp());
}
}