untitled1.java~49~

一个遍历文件系统目录结构的程序并能够将其结构用字符打印出来

package stream;

/**
 * Title:
 * Description:
 * Copyright:    Copyright (c) 2002
 * Company:
 * @author
 * @version 1.0
 */
import java.io.*;

public class Untitled1
{int c;boolean start=true;
RandomAccessFile in_and_out=null;
 File path=new File("c:\\D");
public static void main(String args[])
   {
   try {in_and_out=new RandomAccessFile("tom.txt","rw");}
   catch(FileNotFoundException e)
   {System.out.println("PPPP?????");
   }

     root(path ,5);

   }
  //编写二级以上目录和文件的递归遍历方法
  public void tree(File a,int b)
  { File array[];
     if(a.isDirectory())
        {array=a.listFiles();
          int d=b+5;
          for(int k=0;k<array.length;k++)
             { if(k==array.length-1)
                {if(start)
                  {locate(c);
                   try
                   {in_and_out.writeBytes("|");
                   }
                   catch(IOException e)
                   {System.out.println("????????");
                   }
                   locate(b-c);
                   try
                   {in_and_out.writeBytes("\\--");
                   }
                  catch(IOException e)
                  {System.out.println("????????");
                  }
                  }
                else
                {locate(b);
                try
                {in_and_out.writeBytes("\\--");
                }
                catch(IOException e)
                {System.out.println("????????");
                }
                }
                }
             else
             {if(start)
               {locate(c);
               try
               {in_and_out.writeBytes("|");
               }
               catch(IOException e)
               {System.out.println("????????");
               }
               locate(b-c);
               try
               {in_and_out.writeBytes("+--");
               }
               catch(IOException e)
               {System.out.println("????????");
               }
               }

             else
               {locate(b);
              try
              {in_and_out.writeBytes("+--");
               }
               catch(IOException e)
               {System.out.println("????????");}
               }
             }
    tree(array[k],d);
        }

    }
 else try {in_and_out.writeBytes(a.getName()+"\n");}
      catch(IOException e)
      {System.out.println("????????");}
  }
//编写一级子目录和文件遍历方法
   public void root(File classpath,int d )
   {int i=0;
    locate(d);
    try
    {in_and_out.writeBytes(classpath.getAbsolutePath()+"\n");
      // in_and_out.writeBytes(classpath.getName());
     }
    catch(IOException e)
      {System.out.println("????????");
      }
    d=d+classpath.toString().length()-2;
    c=d;
    File file[];
    if(classpath.isDirectory())
    {file=classpath.listFiles();
       for(i=0;i<file.length;i++)
       { if(i==file.length-1)
         {  locate(c);
            if(file[i].isDirectory())
            {
             try
             {in_and_out.writeBytes("\\--"+file[i].getName()+"\n");
             }
            catch(IOException e)
            {System.out.println("????????");
            }
             start=false;
            }
            else
            {
            try
            {in_and_out.writeBytes("\\--"+file[i].getName()+"\n");
             }
              catch(IOException e)
              {System.out.println("????????");
              }
              start=false;
               continue;

            }
         }
         else
         { locate(c);
            if(file[i].isDirectory())
            {
            try
            {in_and_out.writeBytes("+--"+file[i].getName()+"\n");
            }
            catch(IOException e)
            {System.out.println("????????");
            }
            }
            else
            { try
              {in_and_out.writeBytes("+--"+file[i].getName()+"\n");
               }
               catch(IOException e)
               {System.out.println("????????");
               }
               continue;
            }
         }
       }
       tree(file[i],c+5);
    }
   }
    //编写定位方法
  public void locate(int b)
  {String s; char a[]=new char[100];
      for(int i=0;i<b;i++)
      {a[i]=' ';
      }
    s=new String(a,0,b-1);
     try
     {in_and_out.writeBytes(s);
     }
     catch(IOException e)
     {System.out.println("????????");
     }
  }

}