Java 实例 - 获取 URL 响应头信息

以下实例演示了如何获取指定 URL 的响应头信息：

Main.java 文件

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 ( " http://www.runoob.com " ) ;
         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 ( )   ) ;
     }
}

以上代码运行输出结果为：

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.runoob.com/xmlrpc.php

X-Powered-By    PHP/5.3.15

Content-Type    text/html; charset=UTF-8

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[这个贴子最后由 flybird 在 2020-01-26 18:57:17 重新编辑]

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