File类模拟打印dir

mac2025-07-26 5

package com.cn; import java.io.File; import java.text.SimpleDateFormat; import java.util.Date; import java.util.Scanner; public class FileDemo { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("请输入路径："); String path = sc.nextLine(); File file = new File(path); if(file.exists()) { print(file); }else { System.out.println("文件不存在"); } } public static void print(File file) { if(file.isFile()) { System.out.println(file.getName()); }else {//否则就是目录 SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); File[] files = file.listFiles();//获取该目录下所有文件或者目录 for(File fi :files ) { //创建最后修改时间 Date dat = new Date(fi.lastModified()); //格式化时间 String date = sdf.format(dat); System.out.print(date+"\t"); if(fi.isFile()) {//如果是文件 long len =fi.length(); System.out.print("\t"+len+"\t"); }else {//如果是目录 System.out.print("<DIR>"+"\t"); } //不管是文件还是目录都要有文件名 System.out.println(fi.getName()); } } } }

打印结果：

请输入路径： c:/windows 2007-09-04 16:14:56 180000 aaRemove.exe 2019-03-19 12:52:52 <DIR> addins 2019-08-01 06:48:54 <DIR> appcompat 2019-10-25 17:01:04 <DIR> apppatch 2019-11-01 08:51:10 <DIR> AppReadiness 2019-09-25 18:44:09 <DIR> assembly 2019-10-14 09:19:29 <DIR> bcastdvr 2019-03-19 12:43:47 73216 bfsvc.exe 2019-03-19 19:46:02 <DIR> BitLockerDiscoveryVolumeContents 2019-03-19 12:52:44 <DIR> Boot 2019-11-01 14:09:08 67584 bootstat.dat 2019-03-19 12:52:44 <DIR> Branding 2019-10-13 20:55:34 <DIR> CbsTemp 2019-03-19 20:12:17 <DIR> Containers 1970-01-01 08:00:00 <DIR> CSC 2019-03-19 12:52:53 <DIR> Cursors 2007-07-20 10:14:42 5073256 d3dx9_35.dll 2019-07-31 19:05:19 <DIR> debug 2018-08-08 08:49:51 <DIR> Defender 1970-01-01 08:00:00 7623 diagerr.xml 2019-03-19 12:52:44 <DIR> diagnostics 2019-03-19 12:52:54 <DIR> DiagTrack 1970-01-01 08:00:00 7623 diagwrn.xml 2019-03-19 19:43:03 <DIR> DigitalLocker 2018-11-14 09:39:12 <DIR> Downloaded Installations 2019-03-19 12:52:54 <DIR> Downloaded Program Files 2018-12-20 08:21:54 39 dsspec.ini 2009-07-14 09:40:36 117248 dxva2.dll 2019-03-19 12:52:54 <DIR> ELAMBKUP 2019-03-19 19:43:03 <DIR> en-US 2019-10-13 20:50:26 4612520 explorer.exe 2019-07-31 19:04:21 <DIR> Fonts 2019-03-19 12:52:44 <DIR> GameBarPresenceWriter 2016-08-03 17:27:58 1717760 GdiPlus.dll 2019-03-19 12:52:44 <DIR> Globalization 2019-07-31 18:38:10 <DIR> Help 2019-07-31 18:31:36 1059840 HelpPane.exe 2019-03-19 12:45:38 18432 hh.exe 2019-03-19 12:52:55 <DIR> IdentityCRL 2019-07-31 19:04:18 <DIR> IME 2019-10-14 09:19:29 <DIR> ImmersiveControlPanel 2019-10-29 10:22:09 <DIR> INF 1970-01-01 08:00:00 <DIR> InfusedApps 2019-03-19 12:52:44 <DIR> InputMethod 2019-10-29 10:15:06 <DIR> Installer 2018-04-21 11:16:04 <DIR> kmsonboot 2019-03-19 12:52:56 <DIR> L2Schemas 2019-03-19 12:52:44 <DIR> LanguageOverlayCache 1970-01-01 08:00:00 <DIR> LiveKernelReports 2018-04-21 11:16:20 <DIR> LOG 2019-08-15 13:11:46 <DIR> Logs 2019-03-19 12:52:56 <DIR> Media 2019-03-19 12:44:30 43131 mib.bin 2019-11-01 09:16:43 <DIR> Microsoft.NET 2019-03-19 12:52:44 <DIR> Migration 1970-01-01 08:00:00 <DIR> ModemLogs 2016-07-16 19:42:22 6144 normaliz.dll 2019-03-19 12:45:00 181248 notepad.exe 2019-03-19 19:44:57 <DIR> OCR 2018-10-07 15:04:29 376 ODBC.INI 2019-09-25 18:43:34 469 ODBCINST.INI 2019-03-19 12:53:00 <DIR> Offline Web Pages 2019-08-12 14:59:22 <DIR> Panther 2019-03-19 12:52:44 <DIR> Performance 2019-10-29 10:15:41 59144 PFRO.log 2019-03-19 12:52:44 <DIR> PLA 2019-10-14 09:19:29 <DIR> PolicyDefinitions 1970-01-01 08:00:00 <DIR> Prefetch 2019-10-14 09:19:29 <DIR> PrintDialog 2018-08-08 08:45:05 102400 ProductInfo.ini 2019-03-19 12:46:33 34925 Professional.xml 2019-09-17 08:06:40 <DIR> Provisioning 2017-12-19 06:05:40 897688 py.exe 2017-12-05 20:42:22 55456 pyshellext.amd64.dll 2017-12-19 06:05:40 897688 pyw.exe 2007-02-18 20:00:00 274432 qdv.dll 2007-02-18 20:00:00 2189824 quartz.dll 2019-03-19 12:45:47 358400 regedit.exe 2019-07-31 19:15:14 <DIR> Registration 2019-03-19 19:46:01 <DIR> RemotePackages 2019-03-19 12:52:44 <DIR> rescache 2019-07-31 18:38:11 <DIR> Resources 2018-08-07 08:51:22 2113536 Rule.dat 2019-03-19 12:52:44 <DIR> SchCache 2019-03-19 19:46:01 <DIR> schemas 2019-03-19 19:46:01 <DIR> security 2019-07-31 18:38:03 <DIR> ServiceProfiles 1970-01-01 08:00:00 <DIR> ServiceState 2019-08-15 13:32:59 <DIR> servicing 2019-07-31 19:04:12 <DIR> Setup 2019-07-31 18:34:48 <DIR> ShellComponents 2019-09-17 08:06:40 <DIR> ShellExperiences 2019-06-29 09:55:59 <DIR> ShellNew 2019-03-19 12:52:44 <DIR> SKB 2018-08-07 08:53:00 207096 SMSS-PFRO0724.tmp 2019-08-04 19:40:20 <DIR> SoftwareDistribution 2019-03-19 12:52:44 <DIR> Speech 2019-03-19 12:52:44 <DIR> Speech_OneCore 2019-10-13 20:50:25 132096 splwow64.exe 2006-06-28 04:55:51 8192 srvany.exe 2019-03-19 12:52:44 <DIR> System 2015-10-30 15:21:27 219 system.ini 2019-10-29 10:22:09 <DIR> System32 2019-03-19 19:46:01 <DIR> SystemApps 2019-10-14 09:19:30 <DIR> SystemResources 2019-10-30 20:03:40 <DIR> SysWOW64 2019-03-19 12:52:46 <DIR> TAPI 2019-07-31 19:15:43 <DIR> Tasks 2019-11-01 14:12:06 <DIR> Temp 2019-09-17 08:06:42 <DIR> TextInput 2019-03-19 12:52:46 <DIR> tracing 2016-05-30 03:52:20 14539 TWAINSP_Lenovo_EasyCamera.ini 2016-05-30 03:52:20 7408 TWAINSP_Lenovo_EasyCamera.src 2019-07-31 19:06:24 <DIR> twain_32 2019-03-19 12:46:01 64512 twain_32.dll 2018-05-27 15:20:46 <DIR> UpdateAssistantV2 2018-10-07 15:04:25 39 vbaddin.ini 2019-03-19 12:52:46 <DIR> Vss 2019-03-19 12:52:46 <DIR> WaaS 2019-03-19 12:52:46 <DIR> Web 2015-10-30 15:21:27 92 win.ini 2019-03-19 12:44:30 670 WindowsShell.Manifest 2019-11-01 14:52:55 276 WindowsUpdate.log 2019-03-19 12:46:01 11776 winhlp32.exe 2019-10-20 22:43:00 <DIR> WinSxS 2019-03-19 19:45:55 316640 WMSysPr9.prx 2019-03-19 12:45:54 11264 write.exe 2019-03-19 19:43:04 <DIR> zh-CN

File类

java.io.File;

File类的对象不但可以表示文件还可以表示为目录，，当创建一个文件对象后，就可以利用他来来对文件或者目录的属性进行操作，如：文件名、最后修改时间、文件大小等。

需要注意的是，File对象并不能直接对文件进行读写操作，只能查看文件的属性。

文件有大小，目录是没有大小的。

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