HttpURLConnectionDemo.java

Java documentation HttpURLConnection class

// Demonstrate HttpURLConnection.

import java.net.*;
import java.io.*;
import java.util.*;

class HttpURLConnectionDemo
{
  public static void main(String[] args) {

    try {
      URL url = new URL("http://www.udayton.edu");
          HttpURLConnection connection =
             (HttpURLConnection) url.openConnection();

      // Display request method.
      System.out.println("Request method is " +
                         connection.getRequestMethod());

      // Display response code.
      System.out.println("Response code is " +
                         connection.getResponseCode());

      // Display response message.
      System.out.println("Response Message is " +
                         connection.getResponseMessage());

      // Get a list of the header fields and a set
      // of the header keys.
      Map<String, List<String>> hdrMap = connection.getHeaderFields();
      Set<String> hdrKeys = hdrMap.keySet();

      System.out.println("\nHere is the header:");

      // Display all header keys and values.
      for(String k : hdrKeys) {
        System.out.println("Key: " + k +
                           "  Value: " + hdrMap.get(k));
      }
    } catch(IOException exc) {
      System.out.println(exc);
    }
  }
}

Results

Request method is GET
Response code is 200
Response Message is OK

Here is the header:
Key: null  Value: [HTTP/1.1 200 OK]
Key: Transfer-Encoding  Value: [chunked]
Key: Date  Value: [Thu, 15 Nov 2012 01:56:03 GMT]
Key: Expires  Value: [Thu, 19 Nov 1981 08:52:00 GMT]
Key: Via  Value: [1.1 www.udayton.edu (Access Gateway 3.1.4-27-CEFBE9766872A0DB-29028)]
Key: Set-Cookie  Value: [ZNPCQ003-32393400=c704e451; path=/; domain=.udayton.edu, PHPSESSID=a6265coqtimm029vu02e93stqeor5aq2; path=/; HttpOnly]
Key: Content-Type  Value: [text/html]
Key: X-Powered-By  Value: [PHP/5.2.14]
Key: Server  Value: [Apache/2.2.12 (Linux/SUSE)]
Key: Cache-Control  Value: [no-cache, no-store, no-store, no-cache, must-revalidate, post-check=0, pre-check=0]
Key: Pragma  Value: [no-cache]

Reference

Maintained by John Loomis, updated Wed Nov 14 20:55:46 2012