Re: Applet printing exception

From:

"Ramu" <ramu.eedupalli@gmail.com>

Newsgroups:

comp.lang.java.programmer

Date:

4 Jan 2007 02:22:55 -0800

Message-ID:

<1167906175.829404.251100@q40g2000cwq.googlegroups.com>

hi,
This is my code snippet.could u find the mistake in this code.if i run
this applet i am getting exception and if i run this code as normal
java application printer is getting activated but i am unable to get
printout.

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.io.IOException;
import java.net.*;
import java.io.FileInputStream;

import javax.print.*;
import javax.print.attribute.*;
import javax.print.attribute.standard.*;
import javax.swing.*;
import org.pdfbox.*;
import java.util.Properties;

//<applet code=PrinterApplet width=500 height=500></applet>
public class PrinterApplet extends JApplet
{
//~ Instance fields==================================================
======

    private PrintRequestAttributeSet aset;
    DocFlavor DocFlavor;
    public Doc doc;
    DocPrintJob printerJob;
    JTextPane pane;

    //~ Methods ==================================================
==============

    /**
    * DOCUMENT ME!
    */
    public void init()
    {
        getContentPane().setLayout(new BorderLayout());

        pane = new JTextPane();
        pane.setSize(150, 100);
        pane.setContentType("text/html");
        pane.setText(
        "<html><center><b><big>Applet Test</big></b><br>"
        + "</center></html>");
        getContentPane().add(pane, "Center");

        JPanel buttons = new JPanel();
        buttons.setBackground(Color.white);

        JButton print = new JButton("Print");

        buttons.add(print);

        getContentPane().add(buttons, "South");

        print.addActionListener(new ActionListener() {public void
actionPerformed(ActionEvent e){print();}});
    }

    /**
    * DOCUMENT ME!
    */
    void prep()
    {

        URL url = null;
        aset = new HashPrintRequestAttributeSet();
        aset.add(MediaSizeName.ISO_A4);
        aset.add(new Copies(1));

        try
        {
            FileInputStream fin =new FileInputStream("PrinterApplet.html");

        }
        catch (Exception e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        PrintService pservices =
PrintServiceLookup.lookupDefaultPrintService();
        System.out.println(pservices.getName());

        doc = new SimpleDoc(fin,
javax.print.DocFlavor.INPUT_STREAM.TEXT_HTML_UTF_8, null);
        try
        {
            System.out.println("DOC : \n " + doc.getPrintData());
        }
        catch (IOException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        /* Create a Print Job */
        printerJob = pservices.createPrintJob();
        //printerJob = ps.createPrintJob();
    }

    /**
    * DOCUMENT ME!
    */
    void print()
    {
        prep();
        System.out.println("Printer Name : " +
        printerJob.getPrintService());
        try
        {
            printerJob.print(doc, aset);
        }
        catch (PrintException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        System.out.println("Done Printing.");

    }

}

Andrew Thompson wrote:

Ramu wrote:

Hi All,
1) I want to print my html page from applet.If i run my applet
from browser then my applet should be sigened but i am running my
applet from appletviewer then also i am getting exception

Exception in thread "AWT-EventQueue-1" java.lang.NullPointerException
at PrinterApplet.prep(PrinterApplet.java:80)

What does line 80 of PrintApplet.java say?

and i think my applet need not be signed for the page from which it is
loaded.

You think wrong. It is the end user that suddenly finds
400 pages of 'special offers' dumped to the network printer
just because they visited your web-page, that this is
intended to protect.

And this has not even got to a security issue yet.
The code is 'just plain broken'.

Andrew T.