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Displaying an image from a url

Posted on 1998-07-28
2
207 Views
Last Modified: 2010-03-30
Can you tell me  how to get an image to appear when a user clicks on a button.
On the button click the program reads in a url from a textfield and then should display the appropriate image within the applet - how do I get this to work:

Here is the code, repaint does not repaint the applet and the image does not appear:

import java.awt.*;
import java.applet.*;
import java.net.*;


public class urlimageviewer extends Applet
{
 private Image image;
 private URL urladd;
 private Button loadImage;
 private TextField urlText;
 private String urlTextString;
 
    public void init()
    {
        loadImage = new Button("Get Image");
        urlText = new TextField(30);
        setLayout(new FlowLayout());
        add(urlText);
        add(loadImage);
    }//end of init method

    public void paint(Graphics g)
    {
    boolean b = g.drawImage(image, 20,20,100,100, this);
    }//end of method paint


    public boolean action(Event event, Object arg)
    {
    if (event.target == loadImage)
        {
        try
            {
            urlTextString = urlText.getText();
            urladd = new URL(urlTextString);
            image = getImage(urladd);
            repaint();
            }
            catch(java.lang.Exception ex)
            {
            ex.printStackTrace();
            }
        }//end of if statement
    return true;
    }//end of method action
}//end of class urlImageViewer

Please give me concrete code examples explained in detail, so I don't have to write back for more explanation

Thanks very much for your help

Mel
0
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Question by:help_me
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2 Comments
 

Accepted Solution

by:
usk earned 50 total points
ID: 1228614
I have uploaded an applet with the source code to my homepage

http://www.cybersite.dk/examples/

In my example you can only loade one picture, but you just have to add the URL and TextField code from your own code.

Hope this is what you need.

PS. I used JDK 1.2 beta 3
0
 
LVL 2

Expert Comment

by:vendrig
ID: 1228615
First of all, your applet works fine in my appletviewer 1.1.5
and MSIE3 browser. But not in NSNav 4.05...
Two caveats: painting the image, while it could still be
undefined, especially since you don't use the mediatracker.
More important: security. In usk's example, you can see that he
loads images that have the same codebase.
But it seems like your applet doesn't even load applets from the
same codebase. I have some ideas, but it really is beyond my
short-term expertise:(
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