Java实现Windows的dir命令

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(); 
    } 
}

----------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 
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2001-05-26 21:31        23,264  rational_perm.dat 
2008-04-14 10:39    10,000,152  spket-1.6.11.jar 
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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