统计Java源文件的代码行

废话不多说，直接上代码和程序运行截图：

import java.awt.*; 
import java.awt.event.*; 
import java.io.*; 
import java.util.*; 

import javax.swing.*; 
import javax.swing.table.DefaultTableModel; 

public class CountCodes extends JFrame{ 
    private long codeLines = 0; 
    private long commentLines = 0; 
    private long blankLines = 0; 
    private File fileName; 
     
    private JLabel pathLabel; 
    private JTextField pathField; 
    private JButton openButton; 
    private JPanel panelNorth, panelSouth; 

    private ArrayList<File> list = new ArrayList<File> (); 
    private String[] tableHeader = {"File Name", "Code Lines", "Comment Lines", "Blank Lines"}; 
    private Vector<String> vectorHeader = new Vector<String> (); 
    private Vector<Vector> values = new Vector<Vector> (); 
    private JTable table; 
    private DefaultTableModel tableModel; 
    private JScrollPane scrollPane; 
     
    public CountCodes(){ 
        super("Count Codes"); 
         
        pathLabel = new JLabel("File Path: "); 
        pathField = new JTextField(100); 
        pathField.setEditable(false); 
        openButton = new JButton("Open"); 
         
        openButton.addActionListener( 
                new ActionListener(){ 
                    public void actionPerformed(ActionEvent event){ 
                        openFile(); 
                         
                        if (fileName == null) 
                            return; 
                         
                        analysisFileOrDir(fileName); 
                         
                        for(File file : list){ 
                            analyze(file); 
                        }        
                    } 
                }); 
        panelNorth = new JPanel(); 
         
        panelNorth.setLayout(new BorderLayout()); 
        panelNorth.add(pathLabel, BorderLayout.WEST); 
        panelNorth.add(pathField, BorderLayout.CENTER); 
        panelNorth.add(openButton, BorderLayout.EAST); 
         
        for (int i=0; i<tableHeader.length; i++) 
            vectorHeader.add(tableHeader[i]); 
         
        tableModel = new DefaultTableModel(values, vectorHeader); 

        table = new JTable(tableModel); 
         
        scrollPane = new JScrollPane(table); 
         
        panelSouth = new JPanel(); 
        panelSouth.setLayout(new BorderLayout()); 
        panelSouth.add(scrollPane, BorderLayout.CENTER); 
         
        setLayout(new BorderLayout()); 
        add(panelNorth, BorderLayout.NORTH); 
        add(panelSouth, BorderLayout.CENTER); 
         
        setSize(450, 400); 
        setVisible(true); 
    } 
     
    public static void main(String args[]){ 
        CountCodes countCodes = new CountCodes(); 
        countCodes.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    } 
     
    private void openFile(){ 
        JFileChooser fileChooser = new JFileChooser(); 
        fileChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES); 
         
        int result = fileChooser.showOpenDialog(this); 
         
        if (result == JFileChooser.CANCEL_OPTION) 
            return; 
         
        fileName = fileChooser.getSelectedFile(); 
         
        if (fileName == null || fileName.getName().equals("")) 
            JOptionPane.showMessageDialog(this, "Invalid File Name", "Invalid File Name", JOptionPane.ERROR_MESSAGE); 
         
        pathField.setText(fileName.toString()); 
    } 
    private void zeroVariables(){ 
        this.codeLines = 0; 
        this.commentLines = 0; 
        this.blankLines = 0; 
    } 
    private void analysisFileOrDir(File fileName){ 
        if(fileName.isFile()){ 
            list.add(fileName); 
            return; 
        } 
        else{ 
            File[] fileArray = fileName.listFiles(); 
             
            for(File inArray : fileArray){ 
                if(inArray.isFile() && inArray.getName().matches(".*\\.java$")){ 
                    list.add(inArray); 
                } 
                else if(inArray.isDirectory()){ 
                    analysisFileOrDir(inArray); 
                } 
            } 
        } 
    } 
     
    private void analyze(File fileName){ 
        Vector<String> value = new Vector<String> (); 
         
        String[] strArray = fileName.toString().split("\\\\"); 
         
        value.add(strArray[strArray.length-1]); 
         
        BufferedReader br = null; 
        boolean comment = false; 
        try { 
            br = new BufferedReader(new FileReader(fileName)); 
            String line = ""; 
            while ((line = br.readLine()) != null) { 
                line = line.trim(); 
                if (line.matches("^[\\s&&[^\\n]]*$")) { 
                    blankLines++; 
                } else if (line.startsWith("/*") && !line.endsWith("*/")) { 
                    commentLines++; 
                    comment = true; 
                } else if (line.startsWith("/*") && line.endsWith("*/")) { 
                    commentLines++; 
                } else if (true == comment) { 
                    commentLines++; 
                    if (line.endsWith("*/")) { 
                        comment = false; 
                    } 
                } else if (line.startsWith("//")) { 
                    commentLines++; 
                } else { 
                    codeLines++; 
                } 
            } 
             
            value.add(String.valueOf(codeLines)); 
            value.add(String.valueOf(commentLines)); 
            value.add(String.valueOf(blankLines));   
             
            values.add(value); 
             
            this.table.revalidate(); 
             
            zeroVariables(); 
        } catch (FileNotFoundException e) { 
            e.printStackTrace(); 
        } catch (IOException e) { 
            e.printStackTrace(); 
        } finally { 
            if (br != null) { 
                try { 
                    br.close(); 
                    br = null; 
                } catch (IOException e) { 
                    e.printStackTrace(); 
                } 
            } 
        } 
    } 
}