How to get response header from HTTP request

package com.swain.cell;

import java.io.IOException;

import java.net.MalformedURLException;

import java.net.URL;

import java.net.URLConnection;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

public class HttpResponseHeader {

       public static void main(String[] args) {

              try {

                     URL url = new URL("http://corejavaexample.blogspot.in/");

                     URLConnection connection = url.openConnection();

                     Map responseMap = connection.getHeaderFields();

                     for (Iterator iterator = responseMap.keySet().iterator(); iterator

                                  .hasNext();) {

                           String key = (String) iterator.next();

                           System.out.print(key + " = ");

                           List values = (List) responseMap.get(key);

                           for (int i = 0; i < values.size(); i++) {

                                  Object o = values.get(i);

                                  System.out.print(o + ", ");

                           }

                           System.out.println("");

                     }

              } catch (MalformedURLException e) {

                     e.printStackTrace();

              } catch (IOException e) {

                     e.printStackTrace();

              }

       }

}