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Hi everyone,
First of all:
JServ version: 1.1.2
Apache version: 1.3
Linux SuSE 7.0, AMD Duron processor 700 Mhz, 256 Mb RAM
JDK 1.3
I want to (should I say "have to") do graphics on an offscreen port to
export it in gif format. I tried the following code
public class test
extends HttpServlet
{
HttpServletRequest req;
HttpServletResponse res;
public static void main ( String [] args )
{
try
{
// initialisation du port graphique
BufferedImage image = new BufferedImage ( 550, 400,
BufferedImage.TYPE_INT_RGB );
Graphics2D g2d = image.createGraphics ();
g2d.setColor ( Color.red );
g2d.fillRect ( 100, 100, 400, 300 );
DataOutputStream output = new DataOutputStream ( new
FileOutputStream ( "haha.gif" ) );
int [] pixels = new int [550*400];
image.getRGB ( 0, 0, 550, 400, pixels, 0, 550 );
GIFImage gi = new GIFImage ( pixels, image.getWidth () );
GIFOutputStream gos = new GIFOutputStream ( output );
gi.write ( gos );
gos.flush ();
gos.close ();
}
catch ( Exception e )
{
System.out.println ( "Error: " + e.getMessage () );
e.printStackTrace ();
}
}
public void service ( HttpServletRequest req, HttpServletResponse res )
throws ServletException
{
long then = System.currentTimeMillis ();
this.req = req;
this.res = res;
try
{
// initialisation du port graphique
BufferedImage image = new BufferedImage ( 550, 400,
BufferedImage.TYPE_INT_RGB );
Graphics2D g2d = image.createGraphics ();
g2d.setColor ( Color.red );
g2d.fillRect ( 100, 100, 400, 300 );
res.setContentType ( "image/gif" );
DataOutputStream output = new DataOutputStream
res.getOutputStream () );
int [] pixels = new int [550*400];
image.getRGB ( 0, 0, 550, 400, pixels, 0, 550 );
GIFImage gi = new GIFImage ( pixels, image.getWidth () );
GIFOutputStream gos = new GIFOutputStream ( output );
gi.write ( gos );
gos.flush ();
gos.close ();
}
catch ( Exception e )
{
System.out.println ( "Error: " + e.getMessage () );
e.printStackTrace ();
}
}
}
The main method works on linux, but the servlet does not work (it works on
Wintel though).
This is the error I get (in /var/log/httpd/jserv.log)
[28/12/2000 23:40:45:305 CET] 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.<clinit>(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:58)
at java.awt.image.BufferedImage.createGraphics(BufferedImage.java:1011)
at com.ubimaps.servlets.test.service(test.java:51)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:311)
at
org.apache.jserv.JServConnection.processRequest(JServConnection.java:317)
at org.apache.jserv.JServConnection.run(JServConnection.java:188)
at java.lang.Thread.run(Thread.java:484)
Can somebody help. (I could always make a server and run it on a console
from an X session and redirect my servlet to it, but I consider this to be
an inacceptable hack :-)
thanks in advance,
candide kemmler
NB: I'm new to linux, new to Apache and new to JServ (but not new to
servlets neither java)
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