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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