/*
* This is a very simple example of how to use the HTTPClient package in an
* Applet. It just POSTs a request to a cgi-script on the server when you
* hit the 'Doit' button, and then displays the returned headers and data in
* a text window.
*/
package HTTPClient.doc;
import java.applet.Applet;
import java.awt.Button;
import java.awt.Graphics;
import java.awt.TextArea;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import HTTPClient.HTTPResponse;
import HTTPClient.HTTPConnection;
public class HTTPClientExample extends Applet implements Runnable, ActionListener
{
private HTTPConnection con;
private HTTPResponse rsp = null;
private String script = "/cgi-bin/my_script.cgi";
private String disp = "";
private Thread thread = null;
private boolean done = false;
private TextArea text;
public void init()
{
/* setup a text area and a button */
setLayout(new BorderLayout());
add("Center", text = new TextArea(60, 60));
text.setEditable(false);
Button doit = new Button("Doit");
doit.addActionListener(this);
add("South", doit);
/* get an HTTPConnection */
try
{
con = new HTTPConnection(getCodeBase());
}
catch (Exception e)
{
disp = "Error creating HTTPConnection:\n" + e;
repaint();
return;
}
}
public void start()
{
/* run the http request in a separate thread */
if (thread == null)
{
done = false;
thread = new Thread(this);
thread.start();
}
}
public void run()
{
try
{
while (true)
{
/* wait for the button to be pressed */
waitForDoit();
if (done) break;
/* POST something to the script */
disp = "POSTing ...";
repaint();
rsp = con.Post(script, "Hello World again");
repaint();
}
}
catch (Exception e)
{
disp = "Error POSTing: " + e;
e.printStackTrace();
repaint();
}
}
private synchronized void waitForDoit()
{
try { wait(); } catch (InterruptedException ie) { }
}
private synchronized void notifyDoit()
{
notify();
}
public void stop()
{
if (thread != null)
{
done = true;
notifyDoit();
thread = null;
}
}
public void actionPerformed(ActionEvent evt)
{
notifyDoit(); // tell request thread to do the request
}
public void paint(Graphics g)
{
text.setText(disp + "\n");
if (rsp == null) return;
try
{
text.append("\n---Headers:\n" + rsp.toString());
text.append("\n---Data:\n" + rsp.getText() + "\n");
}
catch (Exception e)
{
text.append("\n---Got Exception:\n" + e + "\n");
}
}
}