JAVA 從http請求頭中獲取Header信息：

request.getHeader(),request.getHeaderNames(),request.getHeaders()

Java獲取Http響應Header信息：

本文中演示如何通過URLConnection獲取Http響應Header信息

1.從響應中獲得Header信息

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

2.從響應Header中獲取Server信息

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

完整的示例

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信息\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信息 \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信息...

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信息 ...

Apache/2.2.3 (CentOS)

轉載于:https://www.cnblogs.com/duanxz/p/3171615.html

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