Java擷取Http響應Header資訊

本文中示範如何通過URLConnection擷取Http響應Header資訊

1.從響應中獲得Header資訊

URL obj = new URL("http://www.qiyadeng.com");                URLConnection conn = obj.openConnection();                Map<String, List<String>> map = conn.getHeaderFields();

2.從響應Header中擷取Server資訊

               Map<String, List<String>> map = conn.getHeaderFields();                List<String> server = map.get("Server");

 

完整的樣本

package com.qiyadeng.http;import java.net.URL;import java.net.URLConnection;import java.util.List;import java.util.Map;public class GetHttpResponseHeader {public static void main(String[] args) {try {                URL obj = new URL("http://www.qiyadeng.com");                URLConnection conn = obj.openConnection();                Map<String, List<String>> map = conn.getHeaderFields();                System.out.println("顯示響應Header資訊\n");for (Map.Entry<String, List<String>> entry : map.entrySet()) {                        System.out.println("Key : " + entry.getKey() +" ,Value : " + entry.getValue());                }                System.out.println("\n使用key獲得響應Header資訊 \n");                List<String> server = map.get("Server");if (server == null) {                        System.out.println("Key 'Server' is not found!");                } else {for (String values : server) {                                System.out.println(values);                        }                }        } catch (Exception e) {                e.printStackTrace();        }  }}

輸出

顯示響應Header資訊...

Key : null ,Value : [HTTP/1.1 200 OK]Key : X-Pingback ,Value : [http://www.qiyadeng.com/xmlrpc.php]Key : Date ,Value : [Sun, 10 Mar 2013 12:16:26 GMT]Key : Transfer-Encoding ,Value : [chunked]Key : Connection ,Value : [close]Key : Content-Type ,Value : [text/html; charset=UTF-8]Key : Server ,Value : [Apache/2.2.3 (CentOS)]Key : X-Powered-By ,Value : [PHP/5.2.17]使用key獲得響應Header資訊 ...Apache/2.2.3 (CentOS)

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本文連結地址: Java擷取Http響應Header資訊