java 第一次作业目标2

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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() {@Overridepublic 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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