1.各种行的说明
在Java源程序中的行共有3种：
(1)代码行，可运行的Java源代码。例如：
1 int n = 10;
(2) 注释行，3种注释均可。例如：
1 /**
2 文档注释
3 */
4
5 /*
6 多行注释
7 */
8
9 //单行注释
(3)空行，既无代码，也无注释；
1
2.特殊行的处理方法
如果有以下行尾单行注释的情况，将该行判定为代码行。
1 int number; //number表示人数 2 int n; /*n表示数量*/
如果有以下行尾多行注释的情况，第1行判定为代码行，第二行判定为注释行。
1 int number; /* number为整型 2 表示人数 */
假设被分析程序源码无其他特殊情况，如:
1 int /*人数*/ number;
代码实现
代码中不使用正则表达式进行简化操作,而是使用逻辑判断.思路还是先在给定的目录下递归寻找所有的java文件,将其加入到ArrayList中.用循环对ArrayList中每一个java文件分别统计总行数,注释行数,空白行数,代码行数.虽然可以只扫描一遍文件就能得到不同的行数,但是为了代码的耦合度和美观,每个统计都分开一个方法.
构造方法
1 ArrayList
2 File root;
3 public CodeAnalyzer(String pathName) {
4 root = new File(pathName); //给定的目录
5 fileList = new ArrayList<>(); //储存java文件
6 }
递归搜索目录下的java文件
1 public void searchFiles() {
2 File[] files = root.listFiles();
3 int length = files.length;
4 for (int i = 0; i < length; i++) {
5 if (files[i].isDirectory()) {
6 root = files[i];
7 searchFiles();
8 } else {
9 if (files[i].getName().endsWith(".java"))
10 fileList.add(files[i]);
11 }
12 }
13 }
统计单个文件的空白行数
1 public int countBlanks(File file) throws IOException {
2 BufferedReader input = new BufferedReader(new FileReader(file));
3 int blanks = 0;
4 String line = null;
5 while ((line = input.readLine()) != null) {
6 if (line.trim().equals("")) blanks++;
7 }
8 return blanks;
9 }
统计单个文件的注释行数
1 public int countComments(File file) throws IOException {
2 BufferedReader input = new BufferedReader(new FileReader(file));
3 int comments = 0;
4 String line = null;
5 while ((line = input.readLine()) != null) {
6 line = line.trim();
7 if (line.startsWith("//")) { //单行注释
8 comments++;
9 } else if (line.startsWith("/*")) { //多行及文档注释
10 comments++;
11 while (!line.endsWith("*/")) {
12 line = input.readLine().trim();
13 comments++;
14 }
15 } else if (line.contains("/*")) { //行尾多行注释
16 line = input.readLine().trim();
17 if (line.endsWith("*/")) comments++;
18 }
19 }
20 return comments;
21 }
总的统计与输出
1 public void codeAnalyze() {
2 double rowsCount = 0;
3 double commentsCount = 0;
4 double blanksCount = 0;
5 double codesCount = 0;
6 DecimalFormat df = new DecimalFormat("#.##");
7 for (File file : fileList) {
8 try {
9 rowsCount += countRows(file);
10 blanksCount += countBlanks(file);
11 commentsCount += countComments(file);
12 codesCount = rowsCount - blanksCount - commentsCount;
13 } catch (IOException e) {
14 e.printStackTrace();
15 }
16 }
17 //输出结果
18 System.out.println("源程序文件总行数:" + (int) rowsCount);
19 System.out.println("代码行数:" + (int) codesCount + ",占" + df.format(codesCount / rowsCount*100) + "%");
20 System.out.println("注释行数:" + (int) commentsCount + ",占" + df.format(commentsCount / rowsCount*100) + "%");
21 System.out.println("空白行数:" + (int) blanksCount + ",占" + df.format(blanksCount / rowsCount*100) + "%");
22 }
主函数
1 public static void main(String[] args) {
2 String pathName = "E:\\1";
3 CodeAnalyzer analyzer = new CodeAnalyzer(pathName);
4 analyzer.searchFiles(); //搜索文件
5 analyzer.codeAnalyze(); //统计文件
6 }
完整代码
1 import java.io.*;
2 import java.util.ArrayList;
3 import java.text.DecimalFormat;
4
5 public class CodeAnalyzer {
6 ArrayList
7 File root;
8
9 public CodeAnalyzer(String pathName) {
10 root = new File(pathName);
11 fileList = new ArrayList<>();
12 }
13
14 public void searchFiles() {
15 File[] files = root.listFiles();
16 int length = files.length;
17 for (int i = 0; i < length; i++) {
18 if (files[i].isDirectory()) {
19 root = files[i];
20 searchFiles();
21 } else {
22 if (files[i].getName().endsWith(".java"))
23 fileList.add(files[i]);
24 }
25 }
26 }
27
28 public void codeAnalyze() {
29 double rowsCount = 0;
30 double commentsCount = 0;
31 double blanksCount = 0;
32 double codesCount = 0;
33 DecimalFormat df = new DecimalFormat("#.##");
34 for (File file : fileList) {
35 try {
36 rowsCount += countRows(file);
37 blanksCount += countBlanks(file);
38 commentsCount += countComments(file);
39 codesCount = rowsCount - blanksCount - commentsCount;
40 } catch (IOException e) {
41 e.printStackTrace();
42 }
43 }
44 //输出结果
45 System.out.println("源程序文件总行数:" + (int) rowsCount);
46 System.out.println("代码行数:" + (int) codesCount + ",占" + df.format(codesCount / rowsCount * 100) + "%");
47 System.out.println("注释行数:" + (int) commentsCount + ",占" + df.format(commentsCount / rowsCount * 100) + "%");
48 System.out.println("空白行数:" + (int) blanksCount + ",占" + df.format(blanksCount / rowsCount * 100) + "%");
49 }
50
51 public int countRows(File file) throws IOException {
52 BufferedReader input = new BufferedReader(new FileReader(file));
53 int rows = 0;
54 while (input.readLine() != null) {
55 rows++;
56 }
57 return rows;
58 }
59
60 public int countBlanks(File file) throws IOException {
61 BufferedReader input = new BufferedReader(new FileReader(file));
62 int blanks = 0;
63 String line = null;
64 while ((line = input.readLine()) != null) {
65 if (line.trim().equals("")) blanks++;
66 }
67 return blanks;
68 }
69
70 public int countComments(File file) throws IOException {
71 BufferedReader input = new BufferedReader(new FileReader(file));
72 int comments = 0;
73 String line = null;
74 while ((line = input.readLine()) != null) {
75 line = line.trim();
76 if (line.startsWith("//")) {//单行注释
77 comments++;
78 } else if (line.startsWith("/*")) { //多行及文档注释
79 comments++;
80 while (!line.endsWith("*/")) {
81 line = input.readLine().trim();
82 comments++;
83 }
84 } else if (line.contains("/*")) { //下行尾多行注释
85 line = input.readLine().trim();
86 if (line.endsWith("*/")) comments++;
87 }
88
89 }
90 return comments;
91 }
92
93 public static void main(String[] args) {
94 String pathName = "F:\\Java\\work";
95 CodeAnalyzer analyzer = new CodeAnalyzer(pathName);
96 analyzer.searchFiles();
97 analyzer.codeAnalyze();
98 }
99
100 }
测试结果
参考项目： 代码计数器，内含有更多python打包exe文件，欢迎查阅！！！