统计代码总行数

最新推荐文章于 2024-12-21 14:36:51 发布

ASD991936157

最新推荐文章于 2024-12-21 14:36:51 发布

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本文链接：https://blog.youkuaiyun.com/ASD991936157/article/details/52909204

本文介绍了如何使用Java和Bash分别统计代码行数，并指出两者统计结果存在的微小误差，大约为921810行与921793行，总体数量级在92万行左右。

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先用java写了个：

package java2.pack2;

import com.google.common.collect.Sets;
import com.google.common.io.Files;

import java.io.*;
import java.nio.charset.Charset;
import java.util.HashSet;
import java.util.Objects;

/**
 * Created by fhqplzj on 16-10-24 at 上午9:51.
 */
public class Stat {
    private int num = 0;
    private HashSet<String> exts = Sets.newHashSet("java", "scala");

    private void dfs(File file) {
        if (file != null) {
            if (file.isFile()) {
                num += singleFile(file);
            } else {
                File[] files = file.listFiles();
                Objects.requireNonNull(files);
                for (File aFile : files) {
                    if (aFile.isDirectory()) {
                        dfs(aFile);
                    } else {
                        num += singleFile(aFile);
                    }
                }
            }
        }
    }

    private int singleFile2(File file) {
        String extension = Files.getFileExtension(file.getAbsolutePath()).toLowerCase();
        int result = 0;
        if (exts.contains(extension)) {
            try {
                result = Files.asCharSource(file, Charset.defaultCharset()).readLines().size();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return result;
    }

    @Deprecated
    private int singleFile(File file) {
        int result = 0;
        String ext = Files.getFileExtension(file.getAbsolutePath()).toLowerCase();
        if (exts.contains(ext)) {
            LineNumberReader lineNumberReader = null;
            try {
                lineNumberReader = new LineNumberReader(new FileReader(file));
                lineNumberReader.skip(file.length());
                result = lineNumberReader.getLineNumber();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (lineNumberReader != null) {
                    try {
                        lineNumberReader.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
        }
        return result;
    }

    public static void main(String[] args) {
        File file = new File("/home/fhqplzj/github/spark-2.0.0");
        Stat stat = new Stat();
        stat.dfs(file);
        System.out.println("stat.num = " + stat.num);
    }
}

package java2.pack2;

import com.google.common.collect.Sets;
import com.google.common.io.Files;

import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.util.HashSet;
import java.util.Objects;

/**
 * Created by fhqplzj on 16-10-24 at 上午9:51.
 */
public class Stat {
    private int num = 0;
    private HashSet<String> exts = Sets.newHashSet("java", "scala");

    private void dfs(File file) {
        if (file != null) {
            if (file.isFile()) {
                num += singleFile(file);
            } else {
                File[] files = file.listFiles();
                Objects.requireNonNull(files);
                for (File aFile : files) {
                    if (aFile.isDirectory()) {
                        dfs(aFile);
                    } else {
                        num += singleFile(aFile);
                    }
                }
            }
        }
    }

    private int singleFile(File file) {
        String extension = Files.getFileExtension(file.getAbsolutePath());
        int result = 0;
        if (exts.contains(extension)) {
            try {
                result = Files.asCharSource(file, Charset.defaultCharset()).readLines().size();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return result;
    }

    public static void main(String[] args) {
        File file = new File("/home/fhqplzj/github/spark-2.0.0");
        Stat stat = new Stat();
        stat.dfs(file);
        System.out.println("stat.num = " + stat.num);
    }
}

再用bash写了个:

#!/usr/bin/env bash
find /home/fhqplzj/github/spark-2.0.0 -type f -name "*.java" -o -name "*.scala" | xargs cat | wc -l

统计spark源码总行数：

java统计结果为：

921810

bash统计结果为：

921793

有一定的误差，大概就是92万行。