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【Java】获取本机外网ip
作者:首君 / 发布于2016/6/27/ 762
package com.platform.tools;
 
/**
 * Created by junko on 2016/6/24 0024.
 */
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
/**
 * 获取本机外网IP地址
 * 思想是访问网站http://1212.ip138.com/ic.asp，得到返回的文本后解析出本机在外网的IP地址
 * @author junko
 *
 */
public class ExternalIpAddressFetcher {
    // 外网IP提供者的网址
    private String externalIpProviderUrl;
 
    // 本机外网IP地址
    private String myExternalIpAddress;
 
    public ExternalIpAddressFetcher(String externalIpProviderUrl) {
        this.externalIpProviderUrl = externalIpProviderUrl;
        String returnedhtml = fetchExternalIpProviderHTML(externalIpProviderUrl);
        parse(returnedhtml);
    }
 
    /**
     * 从外网提供者处获得包含本机外网地址的字符串
     * @param externalIpProviderUrl
     * @return
     */
    private String fetchExternalIpProviderHTML(String externalIpProviderUrl) {
        // 输入流
        InputStream in = null;
 
        // 到外网提供者的Http连接
        HttpURLConnection httpConn = null;
 
        try {
            // 打开连接
            URL url = new URL(externalIpProviderUrl);
            httpConn = (HttpURLConnection) url.openConnection();
 
            // 连接设置
            HttpURLConnection.setFollowRedirects(true);
            httpConn.setRequestMethod("GET");
            httpConn.setRequestProperty("User-Agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows 2000)");
 
            // 获取连接的输入流
            in = httpConn.getInputStream();
            byte[] bytes=new byte[in.available()];// 此大小可根据实际情况调整
 
            // 读取到数组中
            int offset = 0;
            int numRead = 0;
            while (offset < bytes.length
                    && (numRead=in.read(bytes, offset, bytes.length-offset)) >= 0) {
                offset += numRead;
            }
 
            // 将字节转化为为UTF-8的字符串
            String receivedString=new String(bytes,"UTF-8");
 
            // 返回
            return receivedString;
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if(in!=null)
                    in.close();
                httpConn.disconnect();
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
 
        // 出现异常则返回空
        return null;
    }
 
    /**
     * 使用正则表达式解析返回的HTML文本,得到本机外网地址
     * @param html
     */
    private void parse(String html){
        Pattern pattern=Pattern.compile("(\\d{1,3})[.](\\d{1,3})[.](\\d{1,3})[.](\\d{1,3})", Pattern.CASE_INSENSITIVE);
        Matcher matcher=pattern.matcher(html);
        while(matcher.find()){
            myExternalIpAddress=matcher.group(0);
        }
    }
 
    /**
     * 得到本机外网地址,得不到则为空
     * @return
     */
    public String getMyExternalIpAddress() {
        return myExternalIpAddress;
    }
 
    public static void main(String[] args){
        ExternalIpAddressFetcher fetcher=new ExternalIpAddressFetcher("http://1212.ip138.com/ic.asp");
 
        System.out.println(fetcher.getMyExternalIpAddress());
    }
}
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