java跨服务器请求url获得数据

在项目中，有时需要通过请求远程服务器上的url获取数据(前提是程序所在服务器可以和url服务器ping成功),

用java在后台发送请求时，用到了java.net.URL, java.net.URLConnection,

以下是分别用post和get方式请求url的简单工具类实现:

 import java.io.BufferedReader;
 import java.io.InputStreamReader;
 import java.io.PrintWriter;
 import java.net.URL;
 import java.net.URLConnection;
 import java.util.List;
 import java.util.Map;

 public class CallWebPage {
     /**
      * 用get方式连接url
      * @param urlString url路径
      * @param pdata    url参数
      * @return 从url获得的数据
      */
     public static String CallWebPageGet(String urlString,String pdata) {
         String result="";
         PrintWriter out = null;
         BufferedReader in = null;
         URL url=null;
         try {
             url = new URL(urlString+"?"+pdata);//用url路径以及所用参数创建URL实例类
             URLConnection connect = url.openConnection();//创建连接
             connect.setRequestProperty("content-type","application/x-www-form-urlencoded;charset=utf-8");//设置请求header的属性--请求内容类型
             connect.setRequestProperty("method","GET");//设置请求header的属性值--请求方式
             // 建立实际的连接
             connect.connect();  //建立与url所在服务器的连接
             // 获取所有响应头字段
             Map<String, List<String>> map = connect.getHeaderFields();
             // 遍历所有的响应头字段
             for (String key : map.keySet()) {
                 System.out.println(key + "--->" + map.get(key));
             }
             // 定义BufferedReader输入流来读取URL的响应
             in = new BufferedReader(new InputStreamReader(connect.getInputStream()));
             String line="";
             while ((line = in.readLine()) != null) {
                 result +=  line;
             }
         } catch (Exception e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }

         return result;
     }
     /**
      * 用gpost方式连接url
      * @param urlString url路径
      * @param pdata    url参数
      * @return 从url获得的数据
      */
     public static String CallWebPagePost(String urlString,String pdata) {
         String result="";
         PrintWriter out = null;
         BufferedReader in = null;
         URL url=null;
         try {
             url = new URL(urlString);
             URLConnection connect = url.openConnection();
             connect.setRequestProperty("content-type","application/x-www-form-urlencoded;charset=utf-8");
             connect.setRequestProperty("method","POST");
             byte[] bytes= pdata.getBytes("utf-8") ;
             connect.setDoOutput(true);
             connect.setDoInput(true);  

             out = new PrintWriter(connect.getOutputStream());
             // 发送请求参数
             out.print(pdata);
             out.flush();
             // 定义BufferedReader输入流来读取URL的响应
             in = new BufferedReader(new InputStreamReader(connect.getInputStream()));
             String line;
             while ((line = in.readLine()) != null) {
                 result +=  line;
             }
         } catch (Exception e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }

         return result;
     }
 }