Get HTTP response header information via URLConnection in Java

Source: Internet
Author: User
Tags header centos

This article shows how to get the HTTP response header information through URLConnection

1. Get header information from the response

URL obj = new URL ("http://www.bianceng.cn");
URLConnection conn = Obj.openconnection ();
map<string, list<string>> map = Conn.getheaderfields ();

2. Get the server information from the response header

map<string, list<string>> map = Conn.getheaderfields ();
 list<string> Server = map.get ("server");

Complete example

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.bianceng.cn");
                URLConnection conn = Obj.openconnection ();
     
                map<string, list<string>> map = Conn.getheaderfields ();
     
                SYSTEM.OUT.PRINTLN ("Show response header information ... \ n");  For (map.entry<string, list<string>> entry:map.entrySet ()) {System.out.println ("Key
                : "+ entry.getkey () +", Value: "+ entry.getvalue ());
                System.out.println ("\ n use key to get response header information \ 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);
        A catch (Exception e) {e.printstacktrace ()); }
     
  }
     
}

Output

Show Response header information ...

Key:null, value: [http/1.1 OK]
key:x-pingback, value: [http://www.bianceng.cn/xmlrpc.php]
key:date, Va Lue: [Sun, 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]
    
use Key to get response header information ...
    
apache/2.2.3 (CentOS)

Source: http://www.qiyadeng.com/

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