HTTP client

In this chapter you will learn:

A simple HTTP client

A simple HTTP client

The following code uses Socket creates a HTTP client. We can create a HTTP client with URLConnection or HttpURLConnection. This time we are using more low level api to create the HTTP client. From the code below we can see that we have to send an HTTP request to the web server.

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.Socket;
//from   j  a v a 2 s .  co m
public class Main {
  public static void main(String[] args) throws Exception {
    InetAddress addr = InetAddress.getByName("www.google.com");
    Socket socket = new Socket(addr, 80);
    boolean autoflush = true;
    PrintWriter out = new PrintWriter(socket.getOutputStream(), autoflush);
    BufferedReader in = new BufferedReader(

    new InputStreamReader(socket.getInputStream()));
    // send an HTTP request to the web server
    out.println("GET / HTTP/1.1");
    out.println("Host: www.google.com:80");
    out.println("Connection: Close");
    out.println();

    // read the response
    boolean loop = true;
    StringBuilder sb = new StringBuilder(8096);
    while (loop) {
      if (in.ready()) {
        int i = 0;
        while (i != -1) {
          i = in.read();
          sb.append((char) i);
        }
        loop = false;
      }
    }
    System.out.println(sb.toString());
    socket.close();
  }
}