JAVA示例代码说明

整理代码能够直接运行的示例：
1、抓取IP138上面的IP地理位置
/**
     * @see 实现编码乱码问题
     * */
    public String convertStreamToString(InputStream is) throws UnsupportedEncodingException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(is,"gbk"));
        StringBuilder sb = new StringBuilder();
        String line = null;
        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
           try {
            is.close();
           } catch (IOException e) {
            e.printStackTrace();
           }
      }
      return sb.toString();
     }

/**
     * @author Administrator
     * @return ip对应的城市名称
     * */
    public void getCityByIp() {
        HttpClient client = new HttpClient();
        client.getHostConfiguration().setHost("" , 80, "http");       
        PostMethod post = new PostMethod( "/ips.asp" );
        NameValuePair simcard = new NameValuePair( "ip" , this.ipString);
        post.setRequestBody( new NameValuePair[] { simcard});       
        try {
            client.executeMethod(post);
            InputStream iStream = post.getResponseBodyAsStream();
            String contentString = convertStreamToString(iStream);
            Pattern p = Pattern.compile("来自.*
");//正则匹配出来
            Matcher m = p.matcher(contentString);
            while(m.find()) {
               String content = m.group();
               System.out.println("Match:" + content.replaceAll("]+>",""));
            }
        } catch (HttpException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
       
    }

能够实现输入IP地址返回此IP所在的地理位置出来！