Problem in printing to LPT1 through applet?

Question

Hello everyone,
I am having problem in printing through Applet in LPT1 of remote client machine using "gridDoubleClicked" method of customized "GridPanel" which is third party component. The class structure is given below:
public class GridPanel extends Panel implements GridPanelInterface, AdjustmentListener, KeyListener, FocusListener, Serializable
}I am using above class to populate data in table and perform "double click" action. I am using JDK 1.5 and a self signed jar to access from remote machines through applet.The code, I am using is given below:
public class testApplet extends Applet {
    printToLPT1 lpanel =new printToLPT1();
    public void init() {
      this.setLayout(new BorderLayout());
      this.add(lpanel, BorderLayout.CENTER);
      this.setSize(380, 250);
public class printToLPT1 extends Frame{
GridPanel grid;
public printToLPT1() throws Exception {
grid.addGridListener(new GridAdapter() {
            public void gridDoubleClicked(GridEvent ge) {               
                testPrint();
public static void testPrint() throws Exception {
        try {
            BufferedOutputStream pos = new BufferedOutputStream(new FileOutputStream("LPT1"));
            String str = "\n\n\n\n\n\n\n\n\n\n\n";
            pos.write(str.getBytes());
            pos.flush();
            pos.close();
        } catch (Exception fnfe) {
            throw new Exception("PRINTER SETUP IS NOT PROPER");
}For applet, I have used following script in login.html:
<APPLET
     height="200px"
     archive="testprinter.jar,jbcl.jar,grid.jar,plugin.jar" 
     width="390px"
     align="top"
     code="test.testApplet.class"
     name="Testing"
    ALT="<P>This applet requires Java to be enabled!  Check the browser options or see your SysAdmin." MAYSCRIPT>
    <P>This page requires Java!  Get it free from <A HREF='http://www.java.com/'>www.java.com</A>.</P>
</APPLET>
------------------- If signed jar file of application is run using command line in client machine then "double clicked" of GridPanel method works fine and send signal to printer at LPT1 port but when same application is called using applet and accessed from remote machine with printer in LPT1 port, in that time also "double clicked" of GridPanel method works fine but printer could not be found and Exception is thrown java.lang.Exception:"PRINTER SETUP IS NOT PROPER" . Why is this happening? Can anyone suggest me the solution for this problem?
Thanks in advance.
-Ritesh
Edited by: ritesh163 on Apr 15, 2010 2:56 PM

Answer 1

The SSCCE for this problem is given below:
//Applet class
package test;
import java.awt.BorderLayout;
import javax.swing.JApplet;
public class testApplet extends JApplet {
    testPrint lpanel =new testPrint();
    public void init() {
      this.setLayout(new BorderLayout());
      this.add(lpanel, BorderLayout.CENTER);    
      this.setSize(380, 250);    
// Printing class...
package test;
import com.borland.jbcl.layout.XYConstraints;
import java.awt.Color;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import wdn.grid.GridAdapter;
import wdn.grid.GridData;
import wdn.grid.GridEvent;
import wdn.grid.GridPanel;
public class testPrint extends javax.swing.JFrame {
    // Variables declaration - do not modify                    
    private javax.swing.JButton btnPrint;
    private javax.swing.JPanel jPanel1;
    // End of variables declaration     
    GridPanel grid;
    GridData gdata;
    String[] gridCols = {
        "Receipt No", "Name"};
    public testPrint() {
        grid = new GridPanel(0, 8);
        gdata = new GridData(0, 8);
        grid.setRowHeaderWidth(0);
        grid.setGridData(gdata);
        grid.setMultipleSelection(false);
        grid.setColWidths("100,60");
        grid.setColHeaders(gridCols);
        setGridProperties(grid);
        grid.setColSelection(false);
        this.setVisible(true);
        grid.addGridListener(new GridAdapter() {
            public void gridDoubleClicked(GridEvent ge) {
               //This event works fine...
                System.out.println("Press Re-Print button...");
                try{
        stringToPrinter("testing by grid \n\n\n\n\n\n\n\n\n\n\n\n\n");
        }catch(Exception ex){
            ex.printStackTrace();
            public void gridCellsClicked(GridEvent ge) {
                btnPrint.setEnabled(true);
        initComponents();
        jPanel1.add(grid, new XYConstraints(52, 60, 100, 150));
        grid.deleteRows(1, grid.getNumRows());
        grid.insertRow(1);
                    grid.setCellText(1, 1, "12134", false);
                    grid.setCellText(2, 1, "test" + "", false);
                    grid.repaintGrid();
    private void initComponents() {
        jPanel1 = new javax.swing.JPanel();
        btnPrint = new javax.swing.JButton();
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        btnPrint.setText("Print");
        btnPrint.setToolTipText("to Print");
        btnPrint.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnPrintActionPerformed(evt);
        org.jdesktop.layout.GroupLayout jPanel1Layout = new org.jdesktop.layout.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(jPanel1Layout.createSequentialGroup()
                .add(36, 36, 36)
                .add(btnPrint)
                .addContainerGap(287, Short.MAX_VALUE))
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(org.jdesktop.layout.GroupLayout.TRAILING, jPanel1Layout.createSequentialGroup()
                .addContainerGap(198, Short.MAX_VALUE)
                .add(btnPrint)
                .add(57, 57, 57))
        org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(layout.createSequentialGroup()
                .addContainerGap()
                .add(jPanel1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addContainerGap())
        layout.setVerticalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(layout.createSequentialGroup()
                .addContainerGap()
                .add(jPanel1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addContainerGap())
        pack();
    }// </editor-fold>                       
    private void btnPrintActionPerformed(java.awt.event.ActionEvent evt) {                                        
        try{
        stringToPrinter("testing \n\n\n\n\n\n\n\n\n\n\n\n\n");
        }catch(Exception ex){
            ex.printStackTrace();
    public static void setGridProperties(GridPanel grid) {
        grid.setRowHeaderWidth(0);
        grid.setAutoResizeColumns(true);
        grid.setRowNumbers(true);
        grid.setCellSelection(false);
        grid.setRowSelection(true);
        grid.setHighlightColor(Color.blue);
        grid.setHighlightTextColor(Color.white);
        grid.setAutoResizeRows(true);
        grid.addKeyListener(new KeyAdapter() {
            public void keyTyped(KeyEvent e) {
            public void keyPressed(KeyEvent e) {
                if (e.getKeyChar() == KeyEvent.VK_SPACE) {
            public void keyReleased(KeyEvent e) {
    public static void stringToPrinter(String str) throws Exception {
        try {
            System.out.println("inside stringToPrinter...");
            BufferedOutputStream pos = new BufferedOutputStream(new FileOutputStream("LPT1"));
            System.out.println("inside stringToPrinter...1-pos::"+pos);
            pos.write(str.getBytes());
            pos.flush();
            pos.close();
        } catch (Exception fnfe) {
            throw new Exception("PRINTER SETUP IS NOT PROPER");
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new testPrint().setVisible(true);
}