import java.io.BufferedReader;
import java.io.FileWriter;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;

public class vagos {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		String data = "variable=contenido&variable=contenido";
		try {
			  URL url = new URL("http://www.google.es");
			  URLConnection conn = url.openConnection();
			  conn.setDoOutput(true);
			  PrintWriter output = new PrintWriter(conn.getOutputStream());
			  output.write(data);
			  output.flush();
			  
			  FileWriter salida=new FileWriter("C:\\salida.html");
			  
			  StringBuffer answer = new StringBuffer();
			  BufferedReader reader = new BufferedReader(new
                                          InputStreamReader(conn.getInputStream()));
			  String lines;
			  while ((lines = reader.readLine()) != null) {
			    answer.append(lines+"\n");
			    salida.write(lines+"\n");
			  }
			  salida.close();
			  output.close();
			  System.out.println(answer.toString());
			} catch(Exception e) {
				System.out.println("An error has occured");
			} 

	}

}

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

public class URLConnectionReader {
    public static void main(String[] args) throws Exception {
        URL pagina = new URL("http://www.google.com/");
        URLConnection yc = pagina.openConnection();
        
        BufferedReader in = new BufferedReader(new InputStreamReader(yc.getInputStream()));
        String inputLine;

        while ((inputLine = in.readLine()) != null) 
            System.out.println(inputLine);
        in.close();
    }
}