关于获取java获取http响应头信息

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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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