import java.io.BufferedReader;
import java.io.File;
import java.io.FileFilter;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;
import java.util.regex.Pattern;
public class CodeStatDemo {
// 记录注释行数
static long annotationLine = 0;
// 记录空白行数
static long blankLine = 0;
// 记录有效代码的行数
static long codeLine = 0;
// 代码总行数
static long totalLine = 0;
// 文件总数
static long fileCount = 0;
public static void main(String[] args) throws FileNotFoundException {
System.out.println("请输入要统计代码量的java文件或java目录:");
Scanner in = new Scanner(System.in);
String filePath = in.nextLine();
File file = new File(filePath);
// 根据用户输入的文件名和目录执行代码量统计
codeStat(file);
System.out.println("----------统计结果---------");
System.out.println("文件数量:" + fileCount + "个");
System.out.println(file + "文件/目录总行数:" + totalLine);
System.out.println("注释行数:" + annotationLine);
System.out.println("空白行数:" + blankLine);
long otherLine = totalLine - (codeLine + annotationLine + blankLine);
}
private static void codeStat(File file) throws FileNotFoundException {
if (file == null || !file.exists())
throw new FileNotFoundException(file + ",文件不存在!");
fileCount ++; // 文件数累加
if (file.isDirectory()) {
File[] files = file.listFiles(new FileFilter() {
@Override
public boolean accept(File pathname) {
return pathname.getName().endsWith(".java") || pathname.isDirectory();
}
});
for (File target : files) {
codeStat(target);
}
} else {
BufferedReader bufr = null;
try {
// 将指定路径的文件与字符流绑定
bufr = new BufferedReader(new InputStreamReader(new FileInputStream(file)));
} catch (FileNotFoundException e) {
throw new FileNotFoundException(file + ",文件不存在!" + e);
}
// 定义匹配每一行的正则匹配器
Pattern annotationLinePattern = Pattern.compile("((//)|(/\\*+)|((^\\s)*\\*)|((^\\s)*\\*+/))+",
Pattern.MULTILINE + Pattern.DOTALL); // 注释匹配器(匹配单行、多行、文档注释)
Pattern blankLinePattern = Pattern.compile("^\\s*$"); // 空白行匹配器(匹配回车、tab键、空格)
Pattern codeLinePattern = Pattern.compile("(?!import|package).+;\\s*(((//)|(/\\*+)).*)*",
Pattern.MULTILINE + Pattern.DOTALL); // 代码行匹配器(以分号结束为一行有效语句,但不包括import和package语句)
// 遍历文件中的每一行,并根据正则匹配的结果记录每一行匹配的结果
String line = null;
try {
while((line = bufr.readLine()) != null) {
if (annotationLinePattern.matcher(line).find()) {
annotationLine ++;
}
if (blankLinePattern.matcher(line).find()) {
blankLine ++;
}
if (codeLinePattern.matcher(line).matches()) {
codeLine ++;
}
totalLine ++;
}
} catch (IOException e) {
throw new RuntimeException("读取文件失败!" + e);
} finally {
try {
bufr.close(); // 关闭文件输入流并释放系统资源
} catch (IOException e) {
throw new RuntimeException("关闭文件输入流失败!");
}
}
}
}
}
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