批量修改头注释

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileWriter;
import java.io.RandomAccessFile;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

/**
* (1)建立一个窗口，用户可以设置一个目录、编写头注释信息；
* (2)查找目录下所有子文件，如果是Java文件则处理之，如果是目录则递归处理；
* (3)处理Java文件时，打开后，找到package语句或者第一个import语句，作为注释的插入点，插入注释；
* (4)将增加了头注释的文件内容写回文件。
*
* @author Chennzhi
*
*/
public class HeaderCommentsGenerator {
private static int count = 0;

public static void main(String[] args) {
 final JFrame frame = new JFrame("批量修改头注释");
 JPanel contentPane = (JPanel) frame.getContentPane();
 JPanel centerPane = new JPanel(new BorderLayout(10, 10));
 centerPane.setBorder(BorderFactory.createEmptyBorder(10, 10, 0, 10));
 JPanel pathPane = new JPanel(new BorderLayout());
 final JTextField txtPath = new JTextField();
 txtPath.setText("Please select your file or path.");
 pathPane.add(txtPath, BorderLayout.CENTER);
 JButton btnSelectPath = new JButton("Browser");
 btnSelectPath.addActionListener(new ActionListener() {
  public void actionPerformed(ActionEvent e) {
   JFileChooser chooser = new JFileChooser();
   chooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
   int returnVal = chooser.showOpenDialog(frame);
   if (returnVal == JFileChooser.APPROVE_OPTION) {
    txtPath.setText(chooser.getSelectedFile().getAbsolutePath());
   }
  }
 });
 btnSelectPath.setMnemonic('B');
 pathPane.add(btnSelectPath, BorderLayout.EAST);
 centerPane.add(pathPane, BorderLayout.NORTH);
 final JTextArea txtComments = new JTextArea();
 txtComments
   .setText("/*\n"
     + " * Copyright 1992-2013 chennzhi Software, Inc. All rights reserved.\n"
     + " */\n\n");
 centerPane.add(new JScrollPane(txtComments), BorderLayout.CENTER);
 contentPane.add(centerPane, BorderLayout.CENTER);
 JPanel buttonPane = new JPanel(new FlowLayout(FlowLayout.RIGHT, 10, 10));
 JButton btnOK = new JButton("Generate!");
 btnOK.addActionListener(new ActionListener() {
  public void actionPerformed(ActionEvent e) {
   String path = txtPath.getText();
   File file = new File(path);
   if (!file.exists()) {
    JOptionPane.showMessageDialog(frame, "Path '" + path
      + "' not exist.", "Error",
      JOptionPane.ERROR_MESSAGE);
   } else {
    commentFile(file, txtComments.getText());
    JOptionPane.showMessageDialog(frame, "Finish, total "
      + count + " files are processed.", "Information",
      JOptionPane.INFORMATION_MESSAGE);
   }
  }
 });
 btnOK.setMnemonic('G');
 JButton btnClose = new JButton("Close");
 btnClose.addActionListener(new ActionListener() {
  public void actionPerformed(ActionEvent e) {
   System.exit(0);
  }
 });
 btnClose.setMnemonic('C');
 buttonPane.add(btnOK);
 buttonPane.add(btnClose);
 contentPane.add(buttonPane, BorderLayout.SOUTH);
 frame.setSize(500, 300);
 frame.show();
}

private static void commentFile(File file, String comments) {
 if (file != null && file.exists()) {
  if (file.isDirectory()) {
   String[] children = file.list();
   for (int i = 0; i < children.length; i++) {
    File child = new File(file.getPath()
      + System.getProperty("file.separator")
      + children[i]);
    commentFile(child, comments);
   }
  } else {
   if (file.getName().toLowerCase().endsWith(".java")) {
    System.out.println(file.getName());
    count++;
    try {
     RandomAccessFile raFile = new RandomAccessFile(file,
       "rw");
     byte[] content = new byte[(int) raFile.length()];
     raFile.readFully(content);
     String all = new String(content);
     all = all.trim();
     while (all.startsWith("\n")) {
      all = all.substring(1);
     }
     if (all.indexOf("package") != -1) {
      all = all.substring(all.indexOf("package"));
     }
     if (all.indexOf("import") != -1) {
      all = all.substring(all.indexOf("package"));
     }
     all = comments + "\n" + all;
     raFile.close();
     FileWriter writer = new FileWriter(file);
     writer.write(all);
     writer.close();
    } catch (Exception ex) {
     ex.printStackTrace();
    }
   }
  }
 }
}
}