lookupPrintServices(null, null) 找不到打印服务！！急！！！

[wyzchn]

我用lookupPrintServices(null, null)方法查找本地的打印服务，可是一个都查不到，虽然本地的打印服务都是虚拟的打印机，但用windows的word中的打印功能都会查到本地的打印服务。为什么lookupPrintServices(null, null)找不到呢？郁闷！

[wyzchn]

请高手指教！！

[lixiaoxue85]

applet问题 就不太清楚了,如果是权限问题,试下需要电子签名?
还有快结帖噢-,-,我还差40分 哈哈

[wyzchn]

还没解决呢，咋结啊？各位大哥没碰到过类似的问题嘛？

[lixiaoxue85]

贴个代码,不知道对LZ是否有用~
/**
@version 1.01 2004-08-24
@author Cay Horstmann
*/

import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.io.*;
import java.util.*;
import javax.print.*;
import javax.swing.*;

/**
This program demonstrates the use of print services. The program lets you print a GIF image
to any of the print services that support the GIF document flavor.
*/
public class PrintServiceTest
{
public static void main(String[] args)
{
JFrame frame = new PrintServiceFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}

/**
This frame displays the image to be printed. It contains
menus for opening an image file, printing, and selecting
a print service.
*/
class PrintServiceFrame extends JFrame
{
public PrintServiceFrame()
{
setTitle("PrintServiceTest");
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

// set up menu bar
JMenuBar menuBar = new JMenuBar();
setJMenuBar(menuBar);

JMenu menu = new JMenu("File");
menuBar.add(menu);

JMenuItem openItem = new JMenuItem("Open");
menu.add(openItem);
openItem.addActionListener(new
ActionListener()
{
public void actionPerformed(ActionEvent event)
{
openFile();
}
});

JMenuItem printItem = new JMenuItem("Print");
menu.add(printItem);
printItem.addActionListener(new
ActionListener()
{
public void actionPerformed(ActionEvent event)
{
printFile();
}
});

JMenuItem exitItem = new JMenuItem("Exit");
menu.add(exitItem);
exitItem.addActionListener(new
ActionListener()
{
public void actionPerformed(ActionEvent event)
{
System.exit(0);
}
});

menu = new JMenu("Printer");
menuBar.add(menu);
DocFlavor flavor = DocFlavor.INPUT_STREAM.GIF;
addPrintServices(menu, flavor);

// use a label to display the images
label = new JLabel();
add(label);
}

/**
Adds print services to a menu
@param menu the menu to which to add the services
@param flavor the flavor that the services need to support
*/
public void addPrintServices(JMenu menu, DocFlavor flavor)
{
PrintService[] services = PrintServiceLookup.lookupPrintServices(flavor, null);
ButtonGroup group = new ButtonGroup();
for (int i = 0; i < services.length; i++)
{
final PrintService service = services[i];
JRadioButtonMenuItem item = new JRadioButtonMenuItem(service.getName());
menu.add(item);
if (i == 0)
{
item.setSelected(true);
currentService = service;
}
group.add(item);
item.addActionListener(new
ActionListener()
{
public void actionPerformed(ActionEvent event)
{
currentService = service;
}
});
}
}

/**
Open a GIF file and display the image.
*/
public void openFile()
{
// set up file chooser
JFileChooser chooser = new JFileChooser();
chooser.setCurrentDirectory(new File("."));

// accept all files ending with .gif
chooser.setFileFilter(new
javax.swing.filechooser.FileFilter()
{
public boolean accept(File f)
{
return f.getName().toLowerCase().endsWith(".gif") || f.isDirectory();
}

public String getDescription() { return "GIF Images"; }
});

// show file chooser dialog
int r = chooser.showOpenDialog(PrintServiceFrame.this);

// if image file accepted, set it as icon of the label
if(r == JFileChooser.APPROVE_OPTION)
{
fileName = chooser.getSelectedFile().getPath();
label.setIcon(new ImageIcon(fileName));
}
}

/**
Print the current file using the current print service.
*/
public void printFile()
{
try
{
if (fileName == null) return;
if (currentService == null) return;
FileInputStream in = new FileInputStream(fileName);
DocFlavor flavor = DocFlavor.INPUT_STREAM.GIF;
Doc doc = new SimpleDoc(in, flavor, null);
DocPrintJob job = currentService.createPrintJob();
job.print(doc, null);
}
catch (FileNotFoundException e)
{
JOptionPane.showMessageDialog(this, e);
}
catch (PrintException e)
{
JOptionPane.showMessageDialog(this, e);
}
}

private JLabel label;
private String fileName;
private PrintService currentService;
private static final int DEFAULT_WIDTH = 300;
private static final int DEFAULT_HEIGHT = 400;
}

[wyzchn]

用了楼上的例子在本地测了一下，可以找到，然后我有用我的代码在本地的环境中测了一下，也可以找到，但是在系统打包后，在ie中用applet使用该功能时便找不到打印机了。我怀疑是不是权限的问题?可是怎么解决呢？还请高手指教！！

[wyzchn]

顶！

[wyzchn]

顶！！

[lfxlixiang2012]

找不到是因为DocFlavor设置的不对，我现在也不能支持 DocFlavor.INPUT_STREAM.TEXT_HTML_UTF_8。不知道为什么