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:
 1 import java.io.BufferedReader;
 2 import java.io.InputStreamReader;
 3 import java.io.PrintWriter;
 4 import java.net.URL;
 5 import java.net.URLConnection;
 6 import java.util.List;
 7 import java.util.Map;
 8 
 9 public class CallWebPage {
10     /**
11      * 用get方式连接url
12      * @param urlString url路径
13      * @param pdata    url参数
14      * @return 从url获得的数据
15      */
16     public static String CallWebPageGet(String urlString,String pdata) {
17         String result="";
18         PrintWriter out = null;  
19         BufferedReader in = null; 
20         URL url=null;
21         try {
22             url = new URL(urlString+"?"+pdata);//用url路径以及所用参数创建URL实例类
23             URLConnection connect = url.openConnection();//创建连接
24             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
25             connect.setRequestProperty("method","GET");//设置请求header的属性值--请求方式
26             // 建立实际的连接  
27             connect.connect();  //建立与url所在服务器的连接
28             // 获取所有响应头字段  
29             Map<String, List<String>> map = connect.getHeaderFields();  
30             // 遍历所有的响应头字段  
31             for (String key : map.keySet()) {  
32                 System.out.println(key + "--->" + map.get(key));  
33             }  
34             // 定义BufferedReader输入流来读取URL的响应  
35             in = new BufferedReader(new InputStreamReader(connect.getInputStream()));  
36             String line="";  
37             while ((line = in.readLine()) != null) {  
38                 result +=  line;  
39             }  
40         } catch (Exception e) {
41             // TODO Auto-generated catch block
42             e.printStackTrace();
43         }
44         
45         return result;
46     }
47     /**
48      * 用gpost方式连接url
49      * @param urlString url路径
50      * @param pdata    url参数
51      * @return 从url获得的数据
52      */
53     public static String CallWebPagePost(String urlString,String pdata) {
54         String result="";
55         PrintWriter out = null;  
56         BufferedReader in = null; 
57         URL url=null;
58         try {
59             url = new URL(urlString);
60             URLConnection connect = url.openConnection();
61             connect.setRequestProperty("content-type","application/x-www-form-urlencoded;charset=utf-8");
62             connect.setRequestProperty("method","POST");
63             byte[] bytes= pdata.getBytes("utf-8") ;
64             connect.setDoOutput(true);  
65             connect.setDoInput(true);  
66             
67             out = new PrintWriter(connect.getOutputStream());  
68             // 发送请求参数  
69             out.print(pdata);
70             out.flush();  
71             // 定义BufferedReader输入流来读取URL的响应  
72             in = new BufferedReader(new InputStreamReader(connect.getInputStream()));  
73             String line;  
74             while ((line = in.readLine()) != null) {  
75                 result +=  line;  
76             }      
77         } catch (Exception e) {
78             // TODO Auto-generated catch block
79             e.printStackTrace();
80         }
81         
82         return result;
83     }
84 }
View Code