Java 實例– 獲取URL 響應頭信息

Java實例

以下實例演示瞭如何獲取指定URL 的響應頭信息：

/*
 author by w3cschool.cc
 Main.java
 */

import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Map;
import java.util.Set;

public class Main {
    public static void main(String[] args) throws IOException{
        URL url = new URL("../../www.w3cschool.cc/index.html");
        URLConnection conn = url.openConnection();
        
        Map headers = conn.getHeaderFields();
        Set<String> keys = headers.keySet();
        for( String key : keys ){
            String val = conn.getHeaderField(key);
            System.out.println(key+"    "+val);
        }
        System.out.println( conn.getLastModified() );
    }
} 

以上代碼運行輸出結果為：

Transfer-Encoding    chunked
null    HTTP/1.1 200 OK
Server    Tengine/1.3.0
Connection    keep-alive
Vary    Cookie
Date    Mon, 04 May 2015 03:54:05 GMT
X-Pingback    http://www.w3cschool.cc/xmlrpc.php
X-Powered-By    PHP/5.3.15
Content-Type    text/html; charset=UTF-8

Java實例