8月24日。

来源：互联网发布：深度linux系统安装编辑：程序博客网时间：2024/04/29 08:25

列出磁盘目录树

package cn.itcast;

import java.io.*;

public class ListTree
{
public static String makeSpaces(int level)
{
  StringBuffer sbf = new StringBuffer();
  for (int i = 0; i < level; i++)
     {
     sbf.append(" ");
     }
     return sbf.toString();
}

    public static void viewTree(FileWrapper fw)
    {
    if(!fw.exists())
    {
      System.out.println ("该文件不存在!");
      return;
    }

    System.out.println (makePrefix(fw) + fw.getName());
    if(fw.isDirectory())
    {
      File[] fs = fw.listFiles();
         for (int i = 0 ;i < fs.length;i++)//File fl : fs)
         {
         File f1 = fs[i];
         FileWrapper fw1 = null;
         if(i == fs.length - 1)
         {
           fw1 = new FileWrapper(f1,false,fw);
         }
         else
         {
           fw1 = new FileWrapper(f1,true,fw);
         }
             viewTree(fw1);//递归调用
        }

    }
    }


    public static void main(String[] args)
    {
    File file;
    if(args.length < 1)
    {
      file = new File(".");
    }
    else
    {
      file = new File(args[0]);
    }

    FileWrapper fw = new FileWrapper(file,true,null);
    viewTree(fw);
    }



    public static void makeParentPrefix(FileWrapper fw,StringBuffer prefix)
    {
    if(fw.getMyParent().getMyParent() == null)
    {
      return;
    }

    FileWrapper parent = fw.getMyParent();
    if(parent.isLast())
    {
      prefix.append(" │");
    }
    else
    {
      prefix.append("    ");
    }

    makeParentPrefix(parent,prefix);
    }


    public static String makePrefix(FileWrapper fw)
    {

    if(fw.getMyParent() == null)
    {
      return "";
    }

    StringBuffer sbf = new StringBuffer();
    if(fw.isLast())
    {
      sbf.append("─├");
    }
    else
    {
      sbf.append("─└");
    }

    makeParentPrefix(fw,sbf);
    sbf.reverse();
    return sbf.toString();
    }
}

class FileWrapper extends File
{
private boolean bLast = false;
private FileWrapper parent = null;

public FileWrapper(File f,boolean bLast,FileWrapper parent)
{
  super(f.getPath());
  this.parent = parent;
  this.bLast = bLast;
}

public FileWrapper getMyParent()
{
  return parent;
}

public boolean isLast()
{
  return bLast;
}
}