Posted on 2013-03-12 21:40
qiyadeng 閱讀(11188)
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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)