个人电脑做服务器（二）

<%@ page import="java.io.*" contentType="text/html;charset=gb2312" %>
<%@ page language="java" import="java.net.*,java.util.regex.*"%>
<% 
/**
 *   code by the5fire
 *   blog:http://www.the5fire.com
**/
        String htmpath=null; 
        BufferedReader in = null; 
        InputStreamReader isr = null; 
        InputStream is = null; 
        HttpURLConnection huc = null; 
		String ipFilter = "\\d+\\.\\d+\\.\\d+\\.\\d+"; 
		String host = "";
        try{ 
          	 URL url = new URL("http://www.ip138.com/ip2city.asp"); //创建 URL 
              huc = (HttpURLConnection)url.openConnection(); 
              is = huc.getInputStream(); 
              isr = new InputStreamReader(is); 
              in = new BufferedReader(isr); 
              String line = null; 
			  Pattern p = Pattern.compile(ipFilter);
              while(((line = in.readLine()) != null)) { 
                Matcher m = p.matcher(line); 
                if (m.find()) { 
                   host = m.group();//IP地址 
                } 
                 if(line.length()==0) 
                   continue; 
               } 
         } 
        catch (Exception e) { 
            System.err.println(e); 
        } 
         finally {  //无论如何都要关闭流 
            try {  is.close(); isr.close();in.close();huc.disconnect();    
            } catch (Exception e) {} 
        } 
%>
<%=host %>