HTTP URL Connection

Implementation

// Demonstrate HttpURLConnection.
import java.net.*;
import java.io.*;
import java.util.*;

class HttpURLConnectionDemo {
    public static void main(String args[]) throws Exception {
        URL hp = new URL("http://www.google.com");
        HttpURLConnection hpCon = (HttpURLConnection) hp.openConnection();

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

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

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

        // Get a list of the header fields and a set
        // of the header keys.
        Map<String, List<String>> hdrMap = hpCon.getHeaderFields();
        Set<String> hdrField = hdrMap.keySet();
        System.out.println("\nHere is the header:");

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