jnlpfilechooser.java

随书代码 上面有书中的大部分代码

//: gui/jnlp/JnlpFileChooser.java
// Opening files on a local machine with JNLP.
// {Requires: javax.jnlp.FileOpenService;
// You must have javaws.jar in your classpath}
// To create the jnlpfilechooser.jar file, do this:
// cd ..
// cd ..
// jar cvf gui/jnlp/jnlpfilechooser.jar gui/jnlp/*.class
package gui.jnlp;
import javax.jnlp.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;

public class JnlpFileChooser extends JFrame {
  private JTextField fileName = new JTextField();
  private JButton
    open = new JButton("Open"),
    save = new JButton("Save");
  private JEditorPane ep = new JEditorPane();
  private JScrollPane jsp = new JScrollPane();
  private FileContents fileContents;
  public JnlpFileChooser() {
    JPanel p = new JPanel();
    open.addActionListener(new OpenL());
    p.add(open);
    save.addActionListener(new SaveL());
    p.add(save);
    jsp.getViewport().add(ep);
    add(jsp, BorderLayout.CENTER);
    add(p, BorderLayout.SOUTH);
    fileName.setEditable(false);
    p = new JPanel();
    p.setLayout(new GridLayout(2,1));
    p.add(fileName);
    add(p, BorderLayout.NORTH);
    ep.setContentType("text");
    save.setEnabled(false);
  }
  class OpenL implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      FileOpenService fs = null;
      try {
        fs = (FileOpenService)ServiceManager.lookup(
          "javax.jnlp.FileOpenService");
      } catch(UnavailableServiceException use) {
        throw new RuntimeException(use);
      }
      if(fs != null) {
        try {
          fileContents = fs.openFileDialog(".",
            new String[]{"txt", "*"});
          if(fileContents == null)
            return;
          fileName.setText(fileContents.getName());
          ep.read(fileContents.getInputStream(), null);
        } catch(Exception exc) {
          throw new RuntimeException(exc);
        }
        save.setEnabled(true);
      }
    }
  }
  class SaveL implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      FileSaveService fs = null;
      try {
        fs = (FileSaveService)ServiceManager.lookup(
          "javax.jnlp.FileSaveService");
      } catch(UnavailableServiceException use) {
        throw new RuntimeException(use);
      }
      if(fs != null) {
        try {
          fileContents = fs.saveFileDialog(".",
            new String[]{"txt"},
            new ByteArrayInputStream(
              ep.getText().getBytes()),
            fileContents.getName());
          if(fileContents == null)
            return;
          fileName.setText(fileContents.getName());
        } catch(Exception exc) {
          throw new RuntimeException(exc);
        }
      }
    }
  }
  public static void main(String[] args) {
    JnlpFileChooser fc = new JnlpFileChooser();
    fc.setSize(400, 300);
    fc.setVisible(true);
  }
} ///:~