统计代码行数（正则表达式）

package com.yonge.test;

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

public class Test {

	private static int commen, white, normal;

	public Test() {
	}

	private static void countCode(File file) {
		// 判断是否是.java结尾的文件
		if (file.getName().matches(".*\\.java$")) {
			FileReader fr = null;
			BufferedReader br = null;
			try {
				fr = new FileReader(file);
				br = new BufferedReader(fr);
				String lineContent;
				boolean isCommen = false;
				try {
					while (br.ready()) {
						// 由于可能头存在空格，我们加trim()方法
						lineContent = br.readLine().trim();
						// 先判断注释行
						if (lineContent.matches("^//.*")) {
							commen++;
						} else if (lineContent.matches("^/\\*.*")
								&& !lineContent.matches(".*\\*/$")) {
							commen++;
							isCommen = true;
						} else if (isCommen) {
							commen++;
							if (lineContent.matches(".*\\*/$")) {
								isCommen = false;
							}
						} else if (lineContent.matches("^/\\*.*")
								&& lineContent.matches(".*\\*/$")) {
							commen++;
						}
						// 判断空白行
						else if (lineContent.matches("^[\\s && [^\\n]]*$")) {
							white++;
						} else {
							normal++;
						}
					}
				} catch (IOException e) {
					e.printStackTrace();
				}
			} catch (FileNotFoundException e) {
				e.printStackTrace();
				System.out.println("文件【" + file.getAbsolutePath() + "】不存在");
			} finally {
				if (br != null) {
					try {
						br.close();
						if (fr != null) {
							fr.close();
						}
					} catch (IOException e) {
						e.printStackTrace();
					}
				}
			}
		}
	}

	public static void main(String[] args) {

		String filePath = "C:\\Users\\yonge\\workspace\\regex";
		File file = new File(filePath);
		File[] files = file.listFiles();
		if (files != null && files.length > 0) {
			for (File f : files) {
				readDirectory(f);
			}
		}
		System.out.println("空白行数：" + white);
		System.out.println("注释行数：" + commen);
		System.out.println("有效行数：" + normal);
	}

	/**
	 * 递归目录
	 * @param file
	 */
	private static void readDirectory(File file) {
		if (file.isDirectory()) {
			File[] files = file.listFiles();
			for (File f : files) {
				readDirectory(f);
			}
		} else {
			countCode(file);
		}
	}
}