使用JMenuItem打印打开的文档

Question

我想打印一个打开的文件，当我点击打印menuitem.I写了一些代码，但它不能正常工作。它显示打印对话框，然后我点击打印按钮它没有被打印。请帮助我，谢谢。 我的代码：

public class PrintAction extends javax.swing.JFrame { 

JScrollPane scrollPane; 
JTextPane textPane; 
int i=0; 
public PrintAction() { 
    initComponents(); 
} 
@SuppressWarnings("unchecked") 
// <editor-fold defaultstate="collapsed" desc="Generated Code">       
private void initComponents() { 

    tabbedPane = new javax.swing.JTabbedPane(); 
    jMenuBar1 = new javax.swing.JMenuBar(); 
    jMenu1 = new javax.swing.JMenu(); 
    open = new javax.swing.JMenuItem(); 
    print = new javax.swing.JMenuItem(); 

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); 

    jMenu1.setText("File"); 

    open.setText("Open"); 
    open.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      openActionPerformed(evt); 
     } 
    }); 
    jMenu1.add(open); 

    print.setText("Print"); 
    print.addActionListener(new java.awt.event.ActionListener() { 
     public void actionPerformed(java.awt.event.ActionEvent evt) { 
      printActionPerformed(evt); 
     } 
    }); 
    jMenu1.add(print); 

    jMenuBar1.add(jMenu1); 

    setJMenuBar(jMenuBar1); 

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); 
    getContentPane().setLayout(layout); 
    layout.setHorizontalGroup(
     layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addComponent(tabbedPane, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE) 
    ); 
    layout.setVerticalGroup(
     layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) 
     .addComponent(tabbedPane, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 279, Short.MAX_VALUE) 
    ); 

    pack(); 
}// </editor-fold>       

private void openActionPerformed(java.awt.event.ActionEvent evt) {          
    FileDialog fd = new FileDialog(PrintAction.this, "Select File", FileDialog.LOAD); 
    fd.show(); 
    String title; 
    String sts; 
    if (fd.getFile() != null) { 
     sts = fd.getDirectory() + fd.getFile(); 
     title=fd.getFile(); 
     BufferedReader br = null; 
     StringBuffer str = new StringBuffer(""); 
     try { 
      br = new BufferedReader(new FileReader(sts)); 
      String line; 
      try { 
       while ((line = br.readLine()) != null) { 
       str.append(line + "\n"); 
       } 
      } catch (IOException ex) { 
       Logger.getLogger(PrintAction.class.getName()).log(Level.SEVERE, null, ex); 
      } 
     } catch (FileNotFoundException ex) { 
      Logger.getLogger(PrintAction.class.getName()).log(Level.SEVERE, null, ex); 
     } 
     String t = str.toString(); 
     final JInternalFrame internalFrame = new JInternalFrame("",true,true); 
     textPane = new JTextPane(); 
     textPane.setFont(new java.awt.Font("Miriam Fixed", 0, 13)); 
     internalFrame.add(textPane); 
     i+=1; 
     internalFrame.setName("Document"+i); 
     scrollPane=new JScrollPane(textPane); 
     internalFrame.add(scrollPane); 
     internalFrame.setTitle(title); 
     tabbedPane.add(internalFrame); 
     internalFrame.setVisible(true); 
     textPane.setText(t); 
     try { 
      br.close(); 
      } 
     catch (IOException ex) { 
      Logger.getLogger(PrintAction.class.getName()).log(Level.SEVERE, null, ex); 
     } 

} }

private void printActionPerformed(java.awt.event.ActionEvent evt) {          
     PrinterJob pj = PrinterJob.getPrinterJob(); 
     HashPrintRequestAttributeSet printAttr = new HashPrintRequestAttributeSet(); 
     if(pj.printDialog(printAttr))  // Display print dialog 
     {   // If true is returned... 
     try 
     { 
     pj.print(printAttr); // then print 
     } 
     catch(PrinterException e) 
     { 
     JOptionPane.showMessageDialog(this,"Failed to print the file: "+e,"Error",JOptionPane.ERROR_MESSAGE); 
     } 
     } 
}          
public static void main(String args[]) { 
    /* Set the Nimbus look and feel */ 
    //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) "> 
    /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel. 
    * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
    */ 
    try { 
     for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { 
      if ("Nimbus".equals(info.getName())) { 
       javax.swing.UIManager.setLookAndFeel(info.getClassName()); 
       break; 
      } 
     } 
    } catch (ClassNotFoundException ex) { 
     java.util.logging.Logger.getLogger(PrintAction.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (InstantiationException ex) { 
     java.util.logging.Logger.getLogger(PrintAction.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (IllegalAccessException ex) { 
     java.util.logging.Logger.getLogger(PrintAction.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } catch (javax.swing.UnsupportedLookAndFeelException ex) { 
     java.util.logging.Logger.getLogger(PrintAction.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); 
    } 
    //</editor-fold> 

    /* Create and display the form */ 
    java.awt.EventQueue.invokeLater(new Runnable() { 
     public void run() { 
      new PrintAction().setVisible(true); 
     } 
    }); 
} 
// Variables declaration - do not modify      
private javax.swing.JMenu jMenu1; 
private javax.swing.JMenuBar jMenuBar1; 
private javax.swing.JMenuItem open; 
private javax.swing.JMenuItem print; 
private javax.swing.JTabbedPane tabbedPane; 
// End of variables declaration     

}

Answer 1

如果您想打印的文本窗格中的内容，你应该能够使用的print（）方法JTextComponent：

textPane.print(); 

这将显示一个pri nt对话框并打印JTextPane的内容。

另请参阅http://docs.oracle.com/javase/7/docs/api/javax/swing/text/JTextComponent.html#print()或http://docs.oracle.com/javase/tutorial/uiswing/misc/printtext.html了解更多信息如何从组件中打印文本。