對項目中所寫的Java代碼進行計數，看總共寫了多少行代碼???

1.各種行的說明

在Java源程序中的行共有3種：

(1)代碼行，可運行的Java源代碼。例如：

 int n = 10; 

(2) 注釋行，3種注釋均可。例如：

 /**
  文檔注釋
 */

 /*
   多行注釋
 */
 
 //單行注釋

(3)空行，既無代碼，也無注釋；

                                                                                         

2.特殊行的處理方法

如果有以下行尾單行注釋的情況，將該行判定為代碼行。

 int number; //number表示人數 2 int n; /*n表示數量*/ 

如果有以下行尾多行注釋的情況，第1行判定為代碼行，第二行判定為注釋行。

 int number; /* number為整型 2 表示人數 */ 

假設被分析程序源碼無其他特殊情況，如:

 int /*人數*/ number; 

代碼實現

代碼中不使用正則表達式進行簡化操作,而是使用邏輯判斷.
思路還是先在給定的目錄下遞歸尋找所有的java文件,將其加入到ArrayList中.用循環對ArrayList中每一個java文件分別統計總行數,注釋行數,空白行數,代碼行數.雖然可以只掃描一遍文件就能得到不同的行數,但是為了代碼的耦合度和美觀,每個統計都分開一個方法.

構造方法

ArrayList<File> fileList;
File root;
public CodeAnalyzer(String pathName) {
    root = new File(pathName);  //給定的目錄
    fileList = new ArrayList<>(); //儲存java文件
 }

遞歸搜索目錄下的java文件

public void searchFiles() {
File[] files = root.listFiles();
int length = files.length;
for (int i = 0; i < length; i++) {
    if (files[i].isDirectory()) {
        root = files[i];
        searchFiles();
    } else {
        if (files[i].getName().endsWith(".java"))
            fileList.add(files[i]);
           }
    }
}

統計單個文件的空白行數

public int countBlanks(File file) throws IOException {
    BufferedReader input = new BufferedReader(new FileReader(file));
    int blanks = 0;
    String line = null;
    while ((line = input.readLine()) != null) {
        if (line.trim().equals("")) blanks++;
    }
    return blanks;
}

統計單個文件的注釋行數

public int countComments(File file) throws IOException {
    BufferedReader input = new BufferedReader(new FileReader(file));
    int comments = 0;
    String line = null;
    while ((line = input.readLine()) != null) {
        line = line.trim();
        if (line.startsWith("//")) { //單行注釋
            comments++;
        } else if (line.startsWith("/*")) { //多行及文檔注釋
            comments++;
            while (!line.endsWith("*/")) {
                line = input.readLine().trim();
                comments++;
            }
        } else if (line.contains("/*")) { //行尾多行注釋
            line = input.readLine().trim();
            if (line.endsWith("*/")) comments++;
        }
    }
    return comments;
}

總的統計與輸出

public void codeAnalyze() {
    double rowsCount = 0;
    double commentsCount = 0;
    double blanksCount = 0;
    double codesCount = 0;
    DecimalFormat df = new DecimalFormat("#.##");
    for (File file : fileList) {
        try {
            rowsCount += countRows(file);
            blanksCount += countBlanks(file);
            commentsCount += countComments(file);
            codesCount = rowsCount - blanksCount - commentsCount;
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    //輸出結果
    System.out.println("源程序文件總行數:" + (int) rowsCount);
    System.out.println("代碼行數:" + (int) codesCount + ",占" + df.format(codesCount / rowsCount*100) + "%");
    System.out.println("注釋行數:" + (int) commentsCount + ",占" + df.format(commentsCount / rowsCount*100) + "%");
    System.out.println("空白行數:" + (int) blanksCount + ",占" + df.format(blanksCount / rowsCount*100) + "%");
}

主函數

public static void main(String[] args) {
    String pathName = "E:\\1";
    CodeAnalyzer analyzer = new CodeAnalyzer(pathName);
    analyzer.searchFiles(); //搜索文件
    analyzer.codeAnalyze(); //統計文件
}

完整代碼

import java.io.*;
import java.util.ArrayList;
import java.text.DecimalFormat;

public class CodeAnalyzer {
    ArrayList<File> fileList;
    File root;

    public CodeAnalyzer(String pathName) {
        root = new File(pathName);
        fileList = new ArrayList<>();
    }

    public void searchFiles() {
        File[] files = root.listFiles();
        int length = files.length;
        for (int i = 0; i < length; i++) {
            if (files[i].isDirectory()) {
                root = files[i];
                searchFiles();
            } else {
                if (files[i].getName().endsWith(".java"))
                    fileList.add(files[i]);
            }
        }
    }

    public void codeAnalyze() {
        double rowsCount = 0;
        double commentsCount = 0;
        double blanksCount = 0;
        double codesCount = 0;
        DecimalFormat df = new DecimalFormat("#.##");
        for (File file : fileList) {
            try {
                rowsCount += countRows(file);
                blanksCount += countBlanks(file);
                commentsCount += countComments(file);
                codesCount = rowsCount - blanksCount - commentsCount;
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        //輸出結果
        System.out.println("源程序文件總行數:" + (int) rowsCount);
        System.out.println("代碼行數:" + (int) codesCount + ",占" + df.format(codesCount / rowsCount * 100) + "%");
        System.out.println("注釋行數:" + (int) commentsCount + ",占" + df.format(commentsCount / rowsCount * 100) + "%");
        System.out.println("空白行數:" + (int) blanksCount + ",占" + df.format(blanksCount / rowsCount * 100) + "%");
    }

    public int countRows(File file) throws IOException {
        BufferedReader input = new BufferedReader(new FileReader(file));
        int rows = 0;
        while (input.readLine() != null) {
            rows++;
        }
        return rows;
    }

    public int countBlanks(File file) throws IOException {
        BufferedReader input = new BufferedReader(new FileReader(file));
        int blanks = 0;
        String line = null;
        while ((line = input.readLine()) != null) {
            if (line.trim().equals("")) blanks++;
        }
        return blanks;
    }

    public int countComments(File file) throws IOException {
        BufferedReader input = new BufferedReader(new FileReader(file));
        int comments = 0;
        String line = null;
        while ((line = input.readLine()) != null) {
            line = line.trim();
            if (line.startsWith("//")) {//單行注釋
                comments++;
            } else if (line.startsWith("/*")) { //多行及文檔注釋
                comments++;
                while (!line.endsWith("*/")) {
                    line = input.readLine().trim();
                    comments++;
                }
            } else if (line.contains("/*")) { //下行尾多行注釋
                line = input.readLine().trim();
                if (line.endsWith("*/")) comments++;
            }

        }
        return comments;
    }

    public static void main(String[] args) {
        String pathName = "F:\\Java\\work";
        CodeAnalyzer analyzer = new CodeAnalyzer(pathName);
        analyzer.searchFiles();
        analyzer.codeAnalyze();
    }

}

測試結果

 

 參考項目： 代碼計數器，內含有更多python打包exe文件，歡迎查閱！！！