Java实现Windows的dir命令

Java实现Windows的dir命令

 

为做一个文件管理系统所实现的一个很粗糙的小例子，感觉还是有研究价值的。

 

下面是源代码：

 

import java.util.Comparator;
import java.io.File;

/**
* Created by IntelliJ IDEA.<br>
* <b>User</b>: leizhimin<br>
* <b>Date</b>: 2008-7-18 22:43:44<br>
* <b>Note</b>: 文件排序，按照先目录后文件方式排
*/
public class FileComparator implements Comparator<File> {

    public int compare(File o1, File o2) {
        if (o1.isDirectory() && o2.isDirectory()) return o1.compareTo(o2);
        else if(o1.isDirectory() && !o2.isDirectory()) return -1;
        else if(!o1.isDirectory() && o2.isDirectory()) return 1;
        else return o1.compareTo(o2);
    }
}

 

 

import java.io.File;
import java.util.*;
import java.sql.Date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.text.NumberFormat;

/**
* Created by IntelliJ IDEA.<br>
* <b>User</b>: leizhimin<br>
* <b>Date</b>: 2008-7-18 22:02:30<br>
* <b>Note</b>: 模拟dir测试的例程
*/
public class TestFile {
    public static DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm");
    int nl = 18;

    public static void main(String args[]) {
        test();
    }

    public static void test() {
        System.out.println("----------test()----------");
        File file = new File("F:\SOFT_DEV");
//        file.isDirectory();
//        System.out.println(File.pathSeparator);
//        System.out.println(File.pathSeparatorChar);
//        System.out.println(File.separator);
//        System.out.println(File.separatorChar);

        FileComparator fc = new FileComparator();
        File[] lf = file.listFiles();
        Arrays.sort(lf, fc);    //数组排序
        for (File f : lf) {
            String dataStr = df.format(new Date(f.lastModified()));

            if (f.isDirectory()) {
                System.out.print(dataStr + "  <DIR>       ");

            } else {
                System.out.print(dataStr + "  " + getFormatString(String.valueOf(NumberFormat.getInstance().format(f.length()))));
            }
            System.out.println("  " + f.getName());
        }

    }

    //格式化函数
    public static String getFormatString(String s) {
        int nb = 12 - s.length();
        StringBuilder sb = new StringBuilder();
        if (nb > 0) {
            for (int n = 1; n <= nb; n++) {
                sb = sb.append(" ");
            }
        }
        return sb.append(s).toString();
    }
}

 

运行效果：

----------test()----------
2008-06-20 13:01  <DIR>         ACDSee v3.1 SR1 美化版 Plus
2008-06-20 13:01  <DIR>         MyEclipse Enterprise Workbench 6.0.1 GA
2008-06-20 13:02  <DIR>         PLSQL Developer v7.1.4 英文版
2008-06-20 13:02  <DIR>         SQLyog Enterprise v6.5 英文版
2008-07-02 18:04  <DIR>         staruml-5.0
2008-07-07 18:45  <DIR>         Stylus Studio 2008 XML Enterprise Suite v9.1.1050g 官方中文企业版
2008-06-20 13:02  <DIR>         Sybase.PowerDesigner.v12.5.0.2169
2008-06-20 13:02  <DIR>         输入法设置工具 IME TOOL v2.5.9
2008-04-10 18:56    23,510,720  dotnetfx.exe
2006-06-15 11:22    54,666,120  idea-5.1.2.exe
2008-03-18 19:16    90,648,728  idea-7.0.3.exe
2008-04-11 16:08       428,538  IEDevToolBarSetup.rar
2006-06-18 00:00       148,480  IntJ512kg.exe
2008-01-31 11:12    54,278,424  jdk-1_5_0_14-windows-i586-p.exe
2008-05-29 19:07   184,893,774  MyEclipse_6.0.1GA_E3.3.1_Installer.exe
2008-06-24 11:33   461,013,238  MyEclipse_6.5.0GA_E3.3.2_Installer.exe
2008-05-30 08:15     4,320,768  mysql-connector-odbc-5.1.4-win32.msi
2007-02-04 11:08   541,075,612  Rational Rose Enterprise V7.0.nrg
2001-05-26 21:31        23,264  rational_perm.dat
2008-04-14 10:39    10,000,152  spket-1.6.11.jar
2008-06-27 14:45       113,784  tcpTrace081.zip
2008-05-12 15:31    28,847,842  ToadForMySQLFreeware_3.1.1.462.zip
2008-04-12 09:57     1,833,339  UltraISO 9.12 简体中文版.rar
2008-06-11 14:39    16,672,737  Windows Live Messenger(MSN) 8.5.1302.1018_简体去广告搜索多开版_微软聊天工具.rar

 

blog的在线编辑器显示好像有点问题，贴个图吧：