指定一个.java文件，输出其代码行数

最新推荐文章于 2024-02-04 10:35:07 发布

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最新推荐文章于 2024-02-04 10:35:07 发布

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本文介绍了一个简单的Java程序，该程序能够递归地遍历指定目录及其子目录下的所有.java文件，并统计这些文件中非空白及注释行的实际代码行数。

CountList2.java//用来统计java代码行数

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

public class CountList2 {
int countSum;//代码行数

public int getFile(String filePath) throws FileNotFoundException {
  try {
   File file = new File(filePath);
   if (file.isDirectory()) {//判断是否是文件夹
    File[] codeFiles = file.listFiles();
    int s = codeFiles.length;
    for (int i = 0; i < s; i++) {
     getFile(codeFiles[i].getPath());
    }
   } else {
    if (file.getName().endsWith(".java")) {//判断是否是java文件
     System.out.println(file.getName());//输出java文件名称
     countSum += fileList(file);
    }
   }
  } catch (FileNotFoundException e4) {
   System.out.println("erroe1");
   e4.printStackTrace();
  } catch (@SuppressWarnings("hiding") IOException e1) {
   System.out.println("erroe2");
   e1.printStackTrace();
  }
  return countSum;
}

public int fileList(File file) {
  int countSum = 0;//代码行数
  BufferedReader br = null;
  try {
   br = new BufferedReader(new FileReader(file));
   String line = null;
   while ((line = br.readLine()) != null) {
    line = line.trim();
    if (line.matches("^[\\s&&[^\\n]]*$")) {
     blankSum++;
    } else if (line.startsWith("//")) {
     commentSum++;
    } else if (line.startsWith("/*")) {
     commentSum++;
    } else if (line.startsWith("*")) {
     commentSum++;
    } else if (line.endsWith("*/")) {
     commentSum++;
    } else {
     countSum++;
    }
   }
   br.close();
  } catch (Exception e) {
   System.out.println("erroe3");
   e.printStackTrace();
  }
  return countSum;
}

}


countList1.java//用来测试

import java.io.FileNotFoundException;

public class countList1 {

public static void main(String[] args) throws FileNotFoundException {
  String filePath = "E:\\nbtserver";
  CountList2 fn = new CountList2();
  int countSum1=fn.getFile(filePath);
  System.out.println("countSum: " + countSum1);
}
}

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