如何统计某目录下的java文件代码行数

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

public class CodeCounter
{

	static long normalLines = 0;

	static long commentLines = 0;

	static long blankLines = 0;

	public static void main(String[] args)
	{
		File f = new File("D:\\java");
		File[] codeFiles = f.listFiles();
		for (File child : codeFiles)
		{
			if (child.getName().matches(".*\\.java$"))
			{
				parse(child);
			}
		}

		System.out.println("正常代码:" + normalLines);
		System.out.println("注释代码:" + commentLines);
		System.out.println("空白行:" + blankLines);

	}

	private static void parse(File f)
	{
		BufferedReader br = null;
		boolean comment = false;
		try
		{
			br = new BufferedReader(new FileReader(f));
			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
				{
					normalLines++;
				}
			}
		} catch (FileNotFoundException e)
		{
			e.printStackTrace();
		} catch (IOException e)
		{
			e.printStackTrace();
		} finally
		{
			if (br != null)
			{
				try
				{
					br.close();
					br = null;
				} catch (IOException e)
				{
					e.printStackTrace();
				}
			}
		}
	}

}