关于获取java获取http响应头信息

package cn.com.test;

import java.io.IOException;

import java.net.MalformedURLException;

import java.net.URL;

import java.net.URLConnection;

import java.util.Map;

import java.util.Set;

public class Test {

 /**

  * @param args

  */

 public static void main(String[] args) {

  // TODO Auto-generated method stub

  URL url;

  URLConnection conn=null;

  try {

   url = new URL("url");

   conn = url.openConnection();

        

  } catch (MalformedURLException e) {

   // TODO Auto-generated catch block

   e.printStackTrace();

  } catch (IOException e) {

   // TODO Auto-generated catch block

   e.printStackTrace();

  }

       

        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() );

    }

}

-----------------------------------------------------

结果：

null    HTTP/1.1 404 Not Found

X-Runtime    0.006367

Date    Fri, 06 Dec 2013 16:24:39 GMT

Content-Length    728

X-Request-Id    988b5685d1c7be427cc709c29507e565

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

X-Rack-Cache    miss

Connection    keep-alive

Server    thin 1.5.1 codename Straight Razor

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