对照实验(1)-批量清理系统临时文件，对照实验清理
语言之争由来已久，下面做一些IO实验（遍历9G多的文件，批量删除），尽量用事实来比较谁优谁劣。操作系统：win7 64 位，文件包大小：9.68G。
一、语言：C#
开发环境：vs 2013
代码总行数：43行
耗时：7秒
代码：
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace BatchDelete
{
class Program
{
static void Main(string[] args)
{
// 输入目录 e:\tmp
string path;
Console.WriteLine("输入要清理的目录：");
path = Console.ReadLine();
// 开始计时
Console.WriteLine("开始计时："+DateTime.Now.ToString("HH:mm:ss"));
// 先遍历匹配查找再循环删除
if (Directory.Exists(path))
{
Console.Write("正在删除");
foreach (string fileName in Directory.GetFileSystemEntries(path))
{
if (File.Exists(fileName) && fileName.Contains("cachegrind.out"))
{
File.Delete(fileName);
}
}
Console.WriteLine("");
}
else
{
Console.WriteLine("该目录不存在!");
}
// 计时结束
Console.WriteLine("结束计时：" + DateTime.Now.ToString("HH:mm:ss"));
Console.ReadKey();
}
}
}Copy after login
运行效果图：
二、语言：C/C++
开发环境：vs 2013
代码总行数：50行
耗时：36秒
代码：
#include <iostream><span>
#include </span><<span>string</span>><span>
#include </span><Windows.h><span>
#include </span><boost\filesystem\operations.hpp><span>
#include </span><boost\filesystem\path.hpp><span>
#include </span><boost\filesystem\convenience.hpp><span>
#include </span><boost\algorithm\<span>string</span>.hpp>
<span>using</span> <span>namespace</span><span> std;
</span><span>int</span> main(<span>int</span> argc, <span>char</span> *<span> argv[])
{
</span><span>//</span><span> 输入目录 e:\tmp</span>
<span>string</span><span> strPath;
cout </span><< <span>"</span><span>输入要清理的目录：</span><span>"</span> <<<span> endl;
getline(cin, strPath);
</span><span>//</span><span> 开始计时 </span>
SYSTEMTIME sys_time; <span>//</span><span>声明变量</span>
GetLocalTime(&sys_time); <span>//</span><span>将变量值设置为本地时间</span>
printf(<span>"</span><span>开始计时：%02d:%02d:%02d\n</span><span>"</span><span>, sys_time.wHour,sys_time.wMinute,sys_time.wSecond);
</span><span>//</span><span> 先遍历匹配查找再循环删除</span>
<span>namespace</span> fs =<span> boost::filesystem;
fs::path full_path(fs::initial_path());
full_path </span>=<span> fs::system_complete(fs::path(strPath, fs::native));
</span><span>if</span><span> (fs::exists(full_path))
{
cout </span><< <span>"</span><span>正在删除</span><span>"</span><span> ;
fs::directory_iterator item_begin(full_path);
fs::directory_iterator item_end;
</span><span>for</span> (; item_begin != item_end; item_begin++<span>)
{
</span><span>if</span> (!fs::is_directory(*<span>item_begin))
{
</span><span>if</span> (fs::exists(item_begin->path()) && boost::contains(item_begin->path().<span>string</span>(), <span>"</span><span>cachegrind.out</span><span>"</span><span>))
{
fs::remove(item_begin</span>-><span>path());
}
}
}
cout </span><< <span>""</span> <<<span> endl;
}
</span><span>else</span><span>
{
cout </span><< <span>"</span><span>该目录不存在!</span><span>"</span> <<<span> endl;
}
</span><span>//</span><span> 计时结束</span>
GetLocalTime(&<span>sys_time);
printf(</span><span>"</span><span>计时结束：%02d:%02d:%02d\n</span><span>"</span><span>, sys_time.wHour, sys_time.wMinute, sys_time.wSecond);
system(</span><span>"</span><span>pause</span><span>"</span><span>);
</span><span>return</span> <span>0</span><span>;
}</span>Copy after login
运行效果图：
三、语言：PHP
开发环境：Phpstorm
代码总行数：32行
耗时：13秒
代码：
<?php
/**
* Created by PhpStorm.
* User: Administrator
* Date: 16-1-29
* Time: 上午9:31
*/
date_default_timezone_set('prc');
//输入目录 e:\tmp
$path = 'e:\tmp';
//开始计时
echo date("H:i:s",time()) . '<br/>';
//先遍历匹配查找再循环删除
if(is_dir($path))
{
echo "正在删除";
$mydir = dir($path);
while($file = $mydir->read())
{
if(file_exists("$path/$file") && strpos($file, 'cachegrind.out') === 0)
{
unlink("$path/$file");
}
}
echo '<br/>';
}
else
{
echo "该目录不存在!" . '<br/>';
}
//计时结束
echo date("H:i:s",time()) . '<br/>';
Copy after login
运行效果图：
四、语言：Java
开发环境：eclipse
代码总行数：43行
耗时：10秒
代码：
package com.yejing;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;
public class Test {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
// 输入目录 e:\tmp
String path = null;
System.out.println("输入要清理的目录：");
path = s.next();
// 开始计时
Date nowTime=new Date();
SimpleDateFormat time=new SimpleDateFormat("HH:mm:ss");
System.out.println("开始计时："+ time.format(nowTime));
// 先遍历匹配查找再循环删除
File dir = new File(path);
if(dir.exists()){
System.out.print("正在删除");
File[] fs = dir.listFiles();
for(int i=0;i<fs.length;i++){
if(!fs[i].isDirectory()){
if(fs[i].isFile() && fs[i].exists() && fs[i].getName().contains("cachegrind.out"))
{
fs[i].delete();
}
}
}
System.out.println("");
}else{
System.out.println("该目录不存在!");
}
// 计时结束
nowTime=new Date();
System.out.println("开始计时："+ time.format(nowTime));
}
}
Copy after login
运行效果图：
五、语言：Python 3.3.5
开发环境：IDLE
代码总行数：20行
耗时：10秒
代码：
# -*- coding: utf-8 -*-
import datetime
import os
# 输入目录 e:\tmp
path = input("输入要清理的目录：\n");
# 开始计时
print("开始计时：",datetime.datetime.now().strftime('%H:%M:%S'));
# 先遍历匹配查找再循环删除
if(os.path.exists(path)):
print("正在删除");
for parent,dirnames,filenames in os.walk(path):
for filename in filenames:
targetFile = os.path.join(parent,filename)
if (os.path.isfile(targetFile) and "cachegrind.out" in targetFile):
os.remove(targetFile)
else:
print("该目录不存在!");
# 计时结束
print("结束计时：",datetime.datetime.now().strftime('%H:%M:%S'));
Copy after login
运行效果图：
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