retrieve a web page using the URL package, instead of raw socket - Java Network

Java examples for Network:URL Download

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Description

retrieve a web page using the URL package, instead of raw socket

Demo Code

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

public class URLClient {
    public static void main(String argv[]) throws Exception {
        URL u = new URL("http://java2s.com");
        HttpURLConnection uC;/*  w w  w . j av  a  2s  .  c  o  m*/
        int responseCode;
        InputStream input;
        BufferedReader remote;

        try {
            uC = (HttpURLConnection) u.openConnection();
            System.out.println("port " + u.getPort());
            responseCode = uC.getResponseCode();
        } catch (Exception ex) {
            throw new Exception("first : " + ex.getMessage());
        }

        if (responseCode != HttpURLConnection.HTTP_OK) {
            throw new Exception("HTTP response code : "
                    + String.valueOf(responseCode));
        }

        try {
            input = uC.getInputStream();
            remote = new BufferedReader(new InputStreamReader(input));

            String line = new String();

            // we will read and print a few lines only
            line = remote.readLine();
            System.out.println(line);

            line = remote.readLine();
            System.out.println(line);

            line = remote.readLine();
            System.out.println(line);

        } catch (Exception ex) {
            throw new Exception(ex.getMessage());
        }
        System.out.println(" host : " + u.getHost());
        System.out.println(" protocol : " + u.getProtocol());
        System.out.println(" port : " + u.getPort());
        System.out.println(" allow interaction : "
                + uC.getAllowUserInteraction());
        System.out.println(" allow interaction default : "
                + uC.getDefaultAllowUserInteraction());

        System.out.println("URL : " + uC.getURL());
        System.out.println("header : " + uC.getHeaderField("http"));
    }
}

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