Post Form Data to CGI (Java 1.5)

//This one uses java 1.5, the new Generics method.

package uhn;



import java.util.Stack;

import java.net.*;

import java.io.*;



/**

* Title: FormPost

* Description: Post form to CGI server on the net

* Copyright: Copyright (c) 2003

* Company: UHN

* @author Zhibin Lu

* @version 1.0

*/



public class FormPost {

 private URLConnection urlConn;

 private OutputStreamWriter printout;

 private BufferedReader input;

 private Stack para;



 /** Constructor of the class

  * @param url URL address to post form (action)

  * @param parameters parameters to pass to the server

  */

 public FormPost(String url, Stack parameters) {

   para = parameters;

   try {

     urlConn = (new URL(url)).openConnection(new Proxy(Proxy.Type.HTTP, new InetSocketAddress("proxy.uhnres.utoronto.ca", 3128)));

     urlConn.setDoInput(true);

     urlConn.setDoOutput(true);

     urlConn.setUseCaches(false);

     urlConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

     urlConn.setRequestProperty("user-agent", "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0)");

     urlConn.setRequestProperty("accept", "text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5");

   }

   catch (Exception e){

     System.err.println("Constructor of FormPost: " + e);

     urlConn = null;

   }

 }



 /** Connect to the web CGI server

  * @return BufferedReader to read the result from CGI server

  */

 public BufferedReader connect() {

   try {

     printout = new OutputStreamWriter(urlConn.getOutputStream (), "ISO-8859-1");

     if (!para.empty()) {

       printout.write((String) para.pop());

     }

     while (!para.empty()) {

       printout.write("&" + para.pop());

     }

     printout.flush ();

     printout.close ();



     input = new BufferedReader(new InputStreamReader(urlConn.getInputStream ()));

   }

   catch (IOException e) {

       System.err.println("FormPost connect: " + e);

       input = null;

   }

   finally {

     return input;

   }

 }



 /** Close the connect to the CGI server */

 public void close() {

   try {

     input.close();

   }

   catch (IOException e) {

     System.err.println("FormPost close: " + e);

   }

 }

 public static void main(String[] args) throws IOException {

   FormPost form;

   Stack parameters = new Stack();

   String line;



   parameters.push("FORM=MSNH");

   parameters.push("q=test");



   form = new FormPost("http://search.msn.com/results.aspx", parameters);

   BufferedReader in = form.connect();

   while ((line=in.readLine()) != null) {

     System.out.println(line);

   }

   in.close(); form.close();

 }



}///:~