統計某一個文件中有總行數、效行數、空白行數、註釋行數

package com.ed.core.util;

import java.io.*;

/**
 * @ProjectName: gitIdeaWork
 * @Package: com.ed.core.util
 * @ClassName: CodeLineStatisticsTest
 * @Author: 
 * @Description:
 * @Date: 2019/12/26 17:03
 * @Version: 1.0
 */
public class CodeLineStatisticsTest {
    private static int normalLines = 0;  //有效程序行數
    private static int whiteLines = 0;   //空白行數
    private static int commentLines = 0; //註釋行數

    public static void countCodeLine(File file) {
        System.out.println("代碼行數統計：" + file.getAbsolutePath());
        if (file.exists()) {
            try {
                scanFile(file);
            } catch (IOException e) {
                e.printStackTrace();
            }
        } else {
            System.out.println("文件不存在！");
            System.exit(0);
        }
        System.out.println(file.getAbsolutePath() + " ,java文件統計：" +
                "總有效代碼行數: " + normalLines +
                " ,總空白行數：" + whiteLines +
                " ,總註釋行數：" + commentLines +
                " ,總行數：" + (normalLines + whiteLines + commentLines));
    }

    private static void scanFile(File file) throws IOException {
        if (file.isDirectory()) {
            File[] files = file.listFiles();
            for (int i = 0; i < files.length; i++) {
                scanFile(files[i]);
            }
        }
        if (file.isFile()) {
            count(file);
        }
    }

    private static void count(File file) {
        BufferedReader br = null;
        // 判斷此行是否爲註釋行
        boolean comment = false;
        int temp_whiteLines = 0;
        int temp_commentLines = 0;
        int temp_normalLines = 0;

        try {
            br = new BufferedReader(new FileReader(file));
            String line = "";
            while ((line = br.readLine()) != null) {
                line = line.trim();
                if (line.matches("^[//s&&[^//n]]*$")) {
                    // 空行
                    whiteLines++;
                    temp_whiteLines++;
                } else if (line.startsWith("/*") && !line.endsWith("*/")) {
                    // 判斷此行爲"/*"開頭的註釋行
                    commentLines++;
                    comment = true;
                } else if (comment == true && !line.endsWith("*/")) {
                    // 爲多行註釋中的一行（不是開頭和結尾）
                    commentLines++;
                    temp_commentLines++;
                } else if (comment == true && line.endsWith("*/")) {
                    // 爲多行註釋的結束行
                    commentLines++;
                    temp_commentLines++;
                    comment = false;
                } else if (line.startsWith("//")) {
                    // 單行註釋行
                    commentLines++;
                    temp_commentLines++;
                } else {
                    // 正常代碼行
                    normalLines++;
                    temp_normalLines++;
                }
            }

            System.out.println(file.getName() +
                    " ,有效行數" + temp_normalLines +
                    " ,空白行數" + temp_whiteLines +
                    " ,註釋行數" + temp_commentLines +
                    " ,總行數" + (temp_normalLines + temp_whiteLines + temp_commentLines));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (br != null) {
                try {
                    br.close();
                    br = null;
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    //測試
    public static void main(String[] args) {
        File file = new File("C:\\Users\\Desktop\\CodeLineStatisticsTest.java");
        countCodeLine(file);
    }
}