You have to run X Windows on the server for this to work. Also in your
appserver startup file you have to set DISPLAY variable. If you need more
details send me an email and I will dig out the details tommorow.
----- Original Message -----
From: Ching sen, Jackson <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Sunday, November 26, 2000 4:29 AM
Subject: draw image
> hi all,
>
> I copy this draw image servlet from a book
>
> import java.io.*;
> import java.awt.*;
> import javax.servlet.*;
> import javax.servlet.http.*;
>
> import Acme.JPM.Encoders.GifEncoder;
>
> public class HelloWorldGraphics extends HttpServlet {
>
> public void doGet(HttpServletRequest req, HttpServletResponse res)
> throws ServletException, IOException {
> ServletOutputStream out = res.getOutputStream(); // binary output!
>
> Frame frame = null;
> Graphics g = null;
>
> try {
> // Create an unshown frame
> frame = new Frame();
> frame.addNotify();
>
> // Get a graphics region, using the Frame
> Image image = frame.createImage(400, 60);
> g = image.getGraphics();
>
> // Draw "Hello World!" to the off screen graphics context
> g.setFont(new Font("Serif", Font.ITALIC, 48));
> g.drawString("Hello World!", 10, 50);
>
> // Encode the off screen image into a GIF and send it to the client
> res.setContentType("image/gif");
> GifEncoder encoder = new GifEncoder(image, out);
> encoder.encode();
> }
> finally {
> // Clean up resources
> if (g != null) g.dispose();
> if (frame != null) frame.removeNotify();
> }
> }
> }
>
> but I got this error message, pls tell me how to fix it.
>
> java.lang.InternalError: Can't connect to X11 window server using ':0.0'
as the value of the DISPLAY variable.
> at sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)
> at sun.awt.X11GraphicsEnvironment.(X11GraphicsEnvironment.java:58)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:120)
> at
java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment
.java:59)
> at sun.awt.motif.MToolkit.(MToolkit.java:56)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:120)
> at java.awt.Toolkit$2.run(Toolkit.java:495)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:488)
> at java.awt.Window.getToolkit(Window.java:416)
> at java.awt.Frame.addNotify(Frame.java:270)
> at HelloWorldGraphics.doGet(HelloWorldGraphics.java:20)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:715)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:840)
> at com.sun.web.core.ServletWrapper.handleRequest(ServletWrapper.java:155)
> at com.sun.web.core.InvokerServlet.service(InvokerServlet.java:168)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:840)
> at com.sun.web.core.ServletWrapper.handleRequest(ServletWrapper.java:155)
> at com.sun.web.core.Context.handleRequest(Context.java:414)
> at com.sun.web.server.ConnectionHandler.run(ConnectionHandler.java:139)
>
>
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Some relevant FAQs on JSP/Servlets can be found at:
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