代码行数统计工具

import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Created with IntelliJ IDEA.
 * User: 焦一平
 * Date: 2015/6/3
 * Time: 15:56
 * To change this template use File | Settings | File Templates.
 */
public class CountLineNumber {
    static long commentLine = 0;
    static long whiteLine = 0;
    static long normalLine = 0;
    static long totalLine = 0;
    static boolean comment = false;

    public static void main(String[] args) {
        File file = new File("D:\工作\PDS\trunk\sourcecode\service\pns"); // 在这里输入需要统计的文件夹路径
        countLine(file);
        System.out.println("有效代码行数: " + normalLine);
        System.out.println("注释行数: " + commentLine);
        System.out.println("空白行数: " + whiteLine);
        System.out.println("总代码行数: " + totalLine);
    }

    /**
     * 递归统计代码行数
     *
     * @param child
     */
    private static void countLine(File child) { // 遍历子目录
        if (child.getName().matches(".*\.java$") || child.getName().matches(".*\.xml$") || child.getName().matches(".*\.properties") || child.getName().matches(".*\.json")) { // 只查询java文件
            try {
                BufferedReader br = new BufferedReader(new FileReader(child));
                String line = "";
                while ((line = br.readLine()) != null) {
                    parse(line);
                }
            } catch (FileNotFoundException e1) {
                e1.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        if (child.listFiles() != null) {
            for (File f : child.listFiles()) {
                countLine(f);
            }
        }
    }

    private static void parse(String line) {
        line = line.trim();
        totalLine++;
        if (line.length() == 0) {
            whiteLine++;
        } else if (comment) {
            commentLine++;
            if (line.endsWith("*/")) {
                comment = false;
            } else if (line.matches(".*\*/.+")) {
                normalLine++;
                comment = false;
            }
        } else if (line.startsWith("//")) {
            commentLine++;
        } else if (line.matches(".+//.*")) {
            commentLine++;
            normalLine++;
        } else if (line.startsWith("/*") && line.matches(".+\*/.+")) {
            commentLine++;
            normalLine++;
            if (isComment(line)) {
                comment = false;
            } else {
                comment = true;
            }
        } else if (line.startsWith("/*") && !line.endsWith("*/")) {
            commentLine++;
            comment = true;
        } else if (line.startsWith("/*") && line.endsWith("*/")) {
            commentLine++;
            comment = false;
        } else if (line.matches(".+/\*.*") && !line.endsWith("*/")) {
            commentLine++;
            normalLine++;
            if (isComment(line)) {
                comment = false;
            } else {
                comment = true;
            }
        } else if (line.matches(".+/\*.*") && line.endsWith("*/")) {
            commentLine++;
            normalLine++;
            comment = false;
        } else {
            normalLine++;
        }
    }

    private static boolean isComment(String line) { // 查找一行中/*与*/是否成对出现
        int count1 = 0;
        int count2 = 0;
        Pattern p = Pattern.compile("/\*");
        Matcher m = p.matcher(line);
        while (m.find()) {
            count1++;
        }
        p = Pattern.compile("\*/");
        m = p.matcher(line);
        while (m.find()) {
            count2++;
        }
        return (count1 == count2);
    }

}