JAVA文件目录遍历缩进算法

Posted 2023-04-18

遍历某个文件夹，将文件夹下的所有文件都遍历出来。而且要求要有类似资源管理器的树形结构。
目录是遍历出来了，但树形结构的缩进算法想不出来。有哪位高人帮帮忙~~~
目录遍历采用的是递归算法。。

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.File;
import java.io.FileFilter;
import java.util.Enumeration;
import java.util.Vector;

import javax.swing.*;
import javax.swing.tree.*;

public class MainFrame extends JFrame

private JScrollPane imagesp = new JScrollPane();
private JTree tree = new JTree(FileTreeNode.ROOT);
private TreePath lastFilePath;
private JButton scaleB = new JButton("放大");
private JButton scaleS = new JButton("缩小");
private Image img;
private float beishu = 1;

public static void main(String[] args)
new MainFrame();

public MainFrame ()

scaleB.setEnabled(false);
scaleS.setEnabled(false);
this.setSize(400,400);
this.setLayout(new BorderLayout());
JPanel centerPanel = new JPanel();
centerPanel.setLayout(new GridLayout(1,2));

JScrollPane treesp = new JScrollPane();

treesp.setViewportView(tree);
centerPanel.add(treesp);
tree.addMouseListener(new MouseAdapter()
@Override
public void mouseClicked(MouseEvent event)
TreePath treePath = tree.getSelectionPath();
if(treePath!=lastFilePath)
FileTreeNode node = (FileTreeNode)treePath.getLastPathComponent();
if(node.isFile())
String fpath = node.getPath();
lastFilePath = treePath;
img = Toolkit.getDefaultToolkit().createImage(fpath);
imagesp.setViewportView(new JLabel(new ImageIcon(img)));
beishu = 1;
imagesp.repaint();
scaleB.setEnabled(true);
scaleS.setEnabled(true);



);

centerPanel.add(imagesp);

this.add(centerPanel,BorderLayout.CENTER);

JPanel btnPanel = new JPanel();
btnPanel.add(scaleB);
btnPanel.add(scaleS);

scaleB.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent e)
beishu*=2;
Image scaleIMG = img.getScaledInstance((int)(img.getWidth(imagesp)*beishu), (int)(img.getHeight(imagesp)*beishu), Image.SCALE_DEFAULT);
imagesp.setViewportView(new JLabel(new ImageIcon(scaleIMG)));
imagesp.repaint();

);

scaleS.addActionListener(new ActionListener()
public void actionPerformed(ActionEvent e)
beishu/=2;
Image scaleIMG = img.getScaledInstance((int)(img.getWidth(imagesp)*beishu), (int)(img.getHeight(imagesp)*beishu), Image.SCALE_DEFAULT);
imagesp.setViewportView(new JLabel(new ImageIcon(scaleIMG)));
imagesp.repaint();

);

this.add(btnPanel,BorderLayout.SOUTH);

this.setVisible(true);
this.setDefaultCloseOperation(DISPOSE_ON_CLOSE);




class FileTreeNode implements TreeNode

private String name;
private String path;
private boolean isFile;
private Vector<FileTreeNode> children;
private FileTreeNode parent;
private final static ImageFileFilter filter = new ImageFileFilter();
public final static FileTreeNode ROOT = new FileTreeNode("我的电脑","",null);

private FileTreeNode(String name, String path, FileTreeNode parent)
this.name = name;
this.path = path;
this.parent = parent;
File f = new File(path);
if(f.isFile())isFile = true;
else isFile = false;


public Enumeration<FileTreeNode> children()
if(children==null)initChild();
return children.elements();


public String getName()
return name;


public String getPath()
return path;


public boolean isFile()
return isFile;


public boolean getAllowsChildren()
return !isFile;


public TreeNode getChildAt(int childIndex)
if(children==null)initChild();
return children.elementAt(childIndex);


public int getChildCount()
if(children==null)initChild();
return children.size();


public int getIndex(TreeNode node)
return children.indexOf(node);


public TreeNode getParent()
return parent;


public boolean isLeaf()
return isFile;


public String toString()
return name;


private void initChild()
if(this==ROOT)
children = new Vector<FileTreeNode>();
File[] files = File.listRoots();
for(int i=0;i<files.length;i++)
FileTreeNode child = new FileTreeNode(files[i].getPath(),files[i].getPath(),this);
children.add(child);

else
children = new Vector<FileTreeNode>();
File current = new File(path);
if(current.isDirectory())
File[] files = current.listFiles(filter);//filefilter to add
for(int i=0;i<files.length;i++)
FileTreeNode child = new FileTreeNode(files[i].getName(),files[i].getPath(),this);
children.add(child);






class ImageFileFilter implements FileFilter

public boolean accept(File pathname)
if(pathname.isDirectory())return true;
else
String name = pathname.getName();
return match(name);



private boolean match(String name)
if(name.endsWith("jpg"))return true;
else if(name.endsWith("gif"))return true;
else if(name.endsWith("bmp"))return true;
return false;



其实是给另一个问题写的，不过别个已经结了。损失好多分呀。
现在只显示3种文件类型，把FileFilter去掉就行了。 参考技术A 那要看你的程序怎么写得改改就可以了。
你可以用一个Sting存储缩进的空格或者用int存储缩进的数量。进入一个目录增加一位空格就可以了 参考技术B public static void main(String[] args)
File file = new File("C:" + File.separator + "aa");
f(file,0);

public static void f(File file,int level)
if(!file.exists())return;
String str="";
for(int i=0;i<level;i++)
str=str+" ";

System.out.println(str+file.getName());
if (file.isFile())return;
if (file.isDirectory())
File[] files = file.listFiles();
for (int n = 0; n < files.length; n++)
f(files[n],level+1);




路径自己修改

java_遍历文件目录

package util;

import java.io.File;
import java.io.IOException;

//列出File的一些常用操作
public class util {
    /*
     * 列出指定目录下（包括其子目录）的所有文件
     */
    public static void listDirectory(File dir)throws IOException {
        if(!dir.exists())
            throw new IllegalArgumentException("目录："+dir+"不存在.");
        if(!dir.isDirectory()){
            throw new IllegalArgumentException(dir+"不是目录。");
        }
        /*String[] filenames=dir.list();//返回的是字符串数组 直接子的名称 不包含子目录
        for(String string:filenames){
            System.out.println(dir+"\\"+string);
        }*/
        //如果要遍历子目录下的内容就需要构造File对象做递归操作，File提供了直接返回File对象的API
        File[] files=dir.listFiles();
        //for(File file:files){
            //System.out.println(file);
        if(files!=null&&files.length>0){
            for(File file:files){
                if(file.isDirectory())
                    //递归
                    listDirectory(file);
                else
                    System.out.println(file);
            }
        }
    }
}

package util;

import java.io.File;
import java.io.IOException;

public class test {

    public static void main(String[] args)throws IOException {
        util.listDirectory(new File("D:\\一些工具"));
    }

}