何用Java代碼列出一個目錄下所有的文件

你好提問者:

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如果解決了你的問題，請采納，若有疑問請追問，謝謝！

package?com.zyx.cn.baidu_test;

import?java.io.File;

public?class?GetListFile?{

public?static?void?main(String[]?args)?{

showFileName("C:\\Test");

}

private?static?void?showFileName(String?path)?{

File?file?=new?File(path);

if(file.exists()){//判斷文件是否存在

if(file.isDirectory()){//判斷file是否是文件夾

File[]?listFiles?=file.listFiles();//獲取文件下的子文件

//?目錄下文件

if(listFiles.length?==?0){

System.out.println("該文件夾下沒有文件");

}

for?(File?f?:?listFiles)?{

if(f.isDirectory()){//判斷file是否是文件夾

System.out.println("文件夾："+f.getName());

showFileName(f.getAbsolutePath());//文件夾就繼續遍歷下的子文件

}else?if(f.isFile()){

System.out.println("文件："+f.getName());

}else?{

System.err.println("未知錯誤");

}

}

}

}

}

}

結果：

文件：Test.docx

文件：test.txt

文件：Wb.java

結果：

文件夾：Hello

文件：world.txt

文件：Test.docx

文件：test.txt

文件：Wb.java

求java樹形目錄代碼范例

給你一個。一共三個類。是個資源管理器的代碼

// FileList.java

package tl.exercise.swing;

import java.awt.Color;

import java.awt.Component;

import javax.swing.JLabel;

import javax.swing.JList;

import javax.swing.ListCellRenderer;

import javax.swing.ListModel;

import javax.swing.event.ListDataListener;

public class FileList

extends JList {

// PathNode theNode;

FileListModel dataModel;

static final long serialVersionUID = 10;

public FileList() {

dataModel = new FileListModel();

setModel(dataModel);

this.setCellRenderer(new MyCellRenderer());

}

public void fireTreeSelectionChanged(I_fileSystem node) {

// Vector files = node.getFiles();

// theNode = node;

dataModel.setNode(node);

updateUI();

}

}

class FileListModel implements ListModel {

FileList theList;

I_fileSystem node;

char fileType = I_fileSystem.ALL;

public void setNode(I_fileSystem node) {

this.node = node;

}

public Object getElementAt(int index) {

if (node != null) {

return ((I_fileSystem) node).getChild(fileType, index);

} else {

return null;

}

}

public int getSize() {

if (node != null) {

return ((I_fileSystem) node).getChildCount(fileType);

} else {

return 0;

}

}

public void addListDataListener(ListDataListener l) {

}

public void removeListDataListener(ListDataListener l) {

}

}

class MyCellRenderer extends JLabel implements ListCellRenderer {

public MyCellRenderer() {

setOpaque(true);

}

public Component getListCellRendererComponent(

JList list,

Object value,

int index,

boolean isSelected,

boolean cellHasFocus)

{

FolderNode node = (FolderNode) value;

setIcon(node.getIcon());

setText(value.toString());

setBackground(isSelected ? Color.BLUE.darker().darker() : Color.WHITE);

setForeground(isSelected ? Color.WHITE : Color.BLACK);

return this;

}

}

package tl.exercise.swing;

//JExplorer.java

import java.awt.BorderLayout;

import java.awt.Dimension;

import java.awt.Toolkit;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JScrollPane;

import javax.swing.JSplitPane;

import javax.swing.border.BevelBorder;

public class JExplorer {

public static void main(String[] args) {

// JFrame.setDefaultLookAndFeelDecorated(true);

JFrame frame = new JFrame();

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.getContentPane().add(new UI(frame));

frame.pack();

Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();

int left = (screen.width - frame.getWidth()) / 2;

int top = (screen.height - frame.getHeight()) / 2;

frame.setLocation(left, top);

frame.setVisible(true);

}

}

class UI extends JPanel {

// implements I_menuHandler{

static final long serialVersionUID = 0l;

static int LEFT_WIDTH = 200;

static int RIGHT_WIDTH = 300;

static int WINDOW_HEIGHT = 300;

JFrame frame = null;

public UI(JFrame frame) {

// EmptyBorder eb = new EmptyBorder(1,1,1,1);

this.frame = frame;

setPreferredSize(new Dimension(800, 600));

setBorder(new BevelBorder(BevelBorder.LOWERED));

setLayout(new BorderLayout());

FileList list = new FileList();

FileTree tree = new FileTree(list);

tree.setDoubleBuffered(true);

list.setDoubleBuffered(true);

JScrollPane treeView = new JScrollPane(tree);

treeView.setPreferredSize(

new Dimension(LEFT_WIDTH, WINDOW_HEIGHT));

JScrollPane listView = new JScrollPane(list);

listView.setPreferredSize(

new Dimension(RIGHT_WIDTH, WINDOW_HEIGHT));

JSplitPane pane =

new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, treeView,

listView);

pane.setDividerLocation(300);

pane.setDividerSize(4);

// pane.setDoubleBuffered(true);

add(pane);

}

}

package tl.exercise.swing;

//FileTree.java

/***********************************************************

* Author: Jason

* email: tl21cen@hotmail.com

* CSDN blog:

***********************************************************/

import java.awt.Component;

import java.io.File;

import java.util.Vector;

import javax.swing.Icon;

import javax.swing.JTree;

import javax.swing.event.TreeExpansionEvent;

import javax.swing.event.TreeExpansionListener;

import javax.swing.event.TreeModelListener;

import javax.swing.event.TreeSelectionEvent;

import javax.swing.event.TreeSelectionListener;

import javax.swing.filechooser.FileSystemView;

import javax.swing.tree.DefaultTreeCellRenderer;

import javax.swing.tree.TreeModel;

import javax.swing.tree.TreePath;

public class FileTree extends JTree {

static final long serialVersionUID = 0;

private FileList theList;

public FileTree(FileList list) {

theList = list;

setModel(new FileSystemModel(new FolderNode()));

this.setCellRenderer(new FolderRenderer());

addTreeSelectionListener(new TreeSelectionListener() {

public void valueChanged(TreeSelectionEvent tse) {

}

});

this.setSelectionRow(0);

}

public void fireValueChanged(TreeSelectionEvent tse) {

TreePath tp = tse.getNewLeadSelectionPath();

Object o = tp.getLastPathComponent();

// theList.fireTreeSelectionChanged((PathNode)o);

theList.fireTreeSelectionChanged((FolderNode) o);

}

public void fireTreeCollapsed(TreePath path) {

super.fireTreeCollapsed(path);

TreePath curpath = getSelectionPath();

if (path.isDescendant(curpath)) {

setSelectionPath(path);

}

}

public void fireTreeWillExpand(TreePath path) {

System.out.println("Path will expand is " + path);

}

public void fireTreeWillCollapse(TreePath path) {

System.out.println("Path will collapse is " + path);

}

class ExpansionListener implements TreeExpansionListener {

FileTree tree;

public ExpansionListener(FileTree ft) {

tree = ft;

}

public void treeCollapsed(TreeExpansionEvent tee) {

}

public void treeExpanded(TreeExpansionEvent tee) {

}

}

}

class FileSystemModel implements TreeModel {

I_fileSystem theRoot;

char fileType = I_fileSystem.DIRECTORY;

public FileSystemModel(I_fileSystem fs) {

theRoot = fs;

}

public Object getRoot() {

return theRoot;

}

public Object getChild(Object parent, int index) {

return ((I_fileSystem) parent).getChild(fileType, index);

}

public int getChildCount(Object parent) {

return ((I_fileSystem) parent).getChildCount(fileType);

}

public boolean isLeaf(Object node) {

return ((I_fileSystem) node).isLeaf(fileType);

}

public int getIndexOfChild(Object parent, Object child) {

return ((I_fileSystem) parent).getIndexOfChild(fileType, child);

}

public void valueForPathChanged(TreePath path, Object newValue) {

}

public void addTreeModelListener(TreeModelListener l) {

}

public void removeTreeModelListener(TreeModelListener l) {

}

}

interface I_fileSystem {

final public static char DIRECTORY = 'D';

final public static char FILE = 'F';

final public static char ALL = 'A';

public Icon getIcon();

public I_fileSystem getChild(char fileType, int index);

public int getChildCount(char fileType);

public boolean isLeaf(char fileType);

public int getIndexOfChild(char fileType, Object child);

}

/**

* A data model for a JTree. This model explorer windows file system directly.

*

* p

* Perhaps there is a fatal bug with this design. For speed, each of instances

* of this model contains file objects of subdirectory, up to now, there isn't

* any method to release them until program be end. I'm afraid that the memory

* would be full of if the file system is large enough and JVM memery size

* setted too small.

*

* p

* I won't pay more attention to solve it. it isn't goal of current a exercise.

*

* @author Jason

*/

class FolderNode implements I_fileSystem {

// private static FolderNode theRoot;

private static FileSystemView fsView;

private static boolean showHiden = true;;

private File theFile;

private VectorFile all = new VectorFile();

private VectorFile folder = new VectorFile();

/**

* set that whether apply hiden file.

*

* @param ifshow

*/

public void setShowHiden(boolean ifshow) {

showHiden = ifshow;

}

public Icon getIcon() {

return fsView.getSystemIcon(theFile);

}

public String toString() {

// return fsView.

return fsView.getSystemDisplayName(theFile);

}

/**

* create a root node. by default, it should be the DeskTop in window file

* system.

*

*/

public FolderNode() {

fsView = FileSystemView.getFileSystemView();

theFile = fsView.getHomeDirectory();

prepareChildren();

}

private void prepareChildren() {

File[] files = fsView.getFiles(theFile, showHiden);

for (int i = 0; i files.length; i++) {

all.add(files[i]);

if (files[i].isDirectory()

!files[i].toString().toLowerCase().endsWith(".lnk")) {

folder.add(files[i]);

}

}

}

private FolderNode(File file) {

theFile = file;

prepareChildren();

}

public FolderNode getChild(char fileType, int index) {

if (I_fileSystem.DIRECTORY == fileType) {

return new FolderNode(folder.get(index));

} else if (I_fileSystem.ALL == fileType) {

return new FolderNode(all.get(index));

} else if (I_fileSystem.FILE == fileType) {

return null;

} else {

return null;

}

}

public int getChildCount(char fileType) {

if (I_fileSystem.DIRECTORY == fileType) {

return folder.size();

} else if (I_fileSystem.ALL == fileType) {

return all.size();

} else if (I_fileSystem.FILE == fileType) {

return -1;

} else {

return -1;

}

}

public boolean isLeaf(char fileType) {

if (I_fileSystem.DIRECTORY == fileType) {

return folder.size() == 0;

} else if (I_fileSystem.ALL == fileType) {

return all.size() == 0;

} else if (I_fileSystem.FILE == fileType) {

return true;

} else {

return true;

}

}

public int getIndexOfChild(char fileType, Object child) {

if (child instanceof FolderNode) {

if (I_fileSystem.DIRECTORY == fileType) {

return folder.indexOf(((FolderNode) child).theFile);

} else if (I_fileSystem.ALL == fileType) {

return all.indexOf(((FolderNode) child).theFile);

} else if (I_fileSystem.FILE == fileType) {

return -1;

} else {

return -1;

}

} else {

return -1;

}

}

}

class FolderRenderer extends DefaultTreeCellRenderer {

private static final long serialVersionUID = 1L;

public Component getTreeCellRendererComponent(JTree tree, Object value,

boolean sel, boolean expanded, boolean leaf, int row,

boolean hasFocus) {

I_fileSystem node = (I_fileSystem) value;

Icon icon = node.getIcon();

setLeafIcon(icon);

setOpenIcon(icon);

setClosedIcon(icon);

return super.getTreeCellRendererComponent(tree, value, sel, expanded,

leaf, row, hasFocus);

}

}

用java寫一個代碼實現： 如何列出某個目錄下的所有子目錄

/**

* 列出文件夾下的子文件夾名

* @param localRoot

* @throws content

*/

public static void list(String localRoot) throws Exception {

File[] fs = new File(localRoot).listFiles();

if ((fs == null) || (fs.length = 0)) {

System.out.println("空文件夾");

return;

}

for (File f : fs) {

if (f.isDirectory()) {

System.out.println("目錄:"+ f.getName());

}

}

}

建立個class然后見個main方法調用一下就可以了！

java創建目錄或文件夾的方法？

1、File類的createNewFile根據抽象路徑創建一個新的空文件，當抽象路徑制定的文件存在時，創建失敗

2、File類的mkdir方法根據抽象路徑創建目錄

3、File類的mkdirs方法根據抽象路徑創建目錄，包括創建必需但不存在的父目錄

4、File類的createTempFile方法創建臨時文件，可以制定臨時文件的文件名前綴、后綴及文件所在的目錄，如果不指定目錄，則存放在系統的臨時文件夾下。

5、除mkdirs方法外，以上方法在創建文件和目錄時，必須保證目標文件不存在，而且父目錄存在，否則會創建失敗

示例代碼如下：

package?book.io;

import?java.io.File;

import?java.io.IOException;

public?class?CreateFileUtil?{

public?static?boolean?createFile(String?destFileName)?{

File?file?=?new?File(destFileName);

if(file.exists())?{

System.out.println("創建單個文件"?+?destFileName?+?"失敗，目標文件已存在！");

return?false;

}

if?(destFileName.endsWith(File.separator))?{

System.out.println("創建單個文件"?+?destFileName?+?"失敗，目標文件不能為目錄！");

return?false;

}

//判斷目標文件所在的目錄是否存在

if(!file.getParentFile().exists())?{

//如果目標文件所在的目錄不存在，則創建父目錄

System.out.println("目標文件所在目錄不存在，準備創建它！");

if(!file.getParentFile().mkdirs())?{

System.out.println("創建目標文件所在目錄失?。?);

return?false;

}

}

//創建目標文件

try?{

if?(file.createNewFile())?{

System.out.println("創建單個文件"?+?destFileName?+?"成功！");

return?true;

}?else?{

System.out.println("創建單個文件"?+?destFileName?+?"失?。?);

return?false;

}

}?catch?(IOException?e)?{

e.printStackTrace();

System.out.println("創建單個文件"?+?destFileName?+?"失敗！"?+?e.getMessage());

return?false;

}

}

public?static?boolean?createDir(String?destDirName)?{

File?dir?=?new?File(destDirName);

if?(dir.exists())?{

System.out.println("創建目錄"?+?destDirName?+?"失敗，目標目錄已經存在");

return?false;

}

if?(!destDirName.endsWith(File.separator))?{

destDirName?=?destDirName?+?File.separator;

}

//創建目錄

if?(dir.mkdirs())?{

System.out.println("創建目錄"?+?destDirName?+?"成功！");

return?true;

}?else?{

System.out.println("創建目錄"?+?destDirName?+?"失敗！");

return?false;

}

}

public?static?String?createTempFile(String?prefix,?String?suffix,?String?dirName)?{

File?tempFile?=?null;

if?(dirName?==?null)?{

try{

//在默認文件夾下創建臨時文件

tempFile?=?File.createTempFile(prefix,?suffix);

//返回臨時文件的路徑

return?tempFile.getCanonicalPath();

}?catch?(IOException?e)?{

e.printStackTrace();

System.out.println("創建臨時文件失??！"?+?e.getMessage());

return?null;

}

}?else?{

File?dir?=?new?File(dirName);

//如果臨時文件所在目錄不存在，首先創建

if?(!dir.exists())?{

if?(!CreateFileUtil.createDir(dirName))?{

System.out.println("創建臨時文件失敗，不能創建臨時文件所在的目錄！");

return?null;

}

}

try?{

//在指定目錄下創建臨時文件

tempFile?=?File.createTempFile(prefix,?suffix,?dir);

return?tempFile.getCanonicalPath();

}?catch?(IOException?e)?{

e.printStackTrace();

System.out.println("創建臨時文件失敗！"?+?e.getMessage());

return?null;

}

}

}

public?static?void?main(String[]?args)?{

//創建目錄

String?dirName?=?"D:/work/temp/temp0/temp1";

CreateFileUtil.createDir(dirName);

//創建文件

String?fileName?=?dirName?+?"/temp2/tempFile.txt";

CreateFileUtil.createFile(fileName);

//創建臨時文件

String?prefix?=?"temp";

String?suffix?=?".txt";

for?(int?i?=?0;?i??10;?i++)?{

System.out.println("創建了臨時文件："

+?CreateFileUtil.createTempFile(prefix,?suffix,?dirName));

}

//在默認目錄下創建臨時文件

for?(int?i?=?0;?i??10;?i++)?{

System.out.println("在默認目錄下創建了臨時文件："

+?CreateFileUtil.createTempFile(prefix,?suffix,?null));

}

}

}

輸出結果：

創建目錄D:/work/temp/temp0/temp1成功！

目標文件所在目錄不存在，準備創建它！

創建單個文件D:/work/temp/temp0/temp1/temp2/tempFile.txt成功！

創建了臨時文件：D:work emp emp0 emp1 emp5171.txt

創建了臨時文件：D:work emp emp0 emp1 emp5172.txt

創建了臨時文件：D:work emp emp0 emp1 emp5173.txt

創建了臨時文件：D:work emp emp0 emp1 emp5174.txt

創建了臨時文件：D:work emp emp0 emp1 emp5175.txt

創建了臨時文件：D:work emp emp0 emp1 emp5176.txt

創建了臨時文件：D:work emp emp0 emp1 emp5177.txt

創建了臨時文件：D:work emp emp0 emp1 emp5178.txt

創建了臨時文件：D:work emp emp0 emp1 emp5179.txt

創建了臨時文件：D:work emp emp0 emp1 emp5180.txt

在默認目錄下創建了臨時文件：C:Documents and SettingsAdministratorLocal SettingsTemp emp5181.txt

在默認目錄下創建了臨時文件：C:Documents and SettingsAdministratorLocal SettingsTemp emp5182.txt

在默認目錄下創建了臨時文件：C:Documents and SettingsAdministratorLocal SettingsTemp emp5183.txt

在默認目錄下創建了臨時文件：C:Documents and SettingsAdministratorLocal SettingsTemp emp5184.txt

在默認目錄下創建了臨時文件：C:Documents and SettingsAdministratorLocal SettingsTemp emp5185.txt

在默認目錄下創建了臨時文件：C:Documents and SettingsAdministratorLocal SettingsTemp emp5186.txt

在默認目錄下創建了臨時文件：C:Documents and SettingsAdministratorLocal SettingsTemp emp5187.txt

在默認目錄下創建了臨時文件：C:Documents and SettingsAdministratorLocal SettingsTemp emp5188.txt

在默認目錄下創建了臨時文件：C:Documents and SettingsAdministratorLocal SettingsTemp emp5189.txt

在默認目錄下創建了臨時文件：C:Documents and SettingsAdministratorLocal SettingsTemp emp5190.txt

如何用JAVA代碼創建一個文件夾？

File類里面有兩個方法可以實現：\x0d\x0a一個是mkdir():創建此抽象路徑名指定的目錄。\x0d\x0a另外一個是mkdirs(): 創建此抽象路徑名指定的目錄，包括所有必需但不存在的父目錄。\x0d\x0a\x0d\x0a比如你想在A文件夾創建一個B文件夾，并在B文件夾下創建c和D文件夾，可以用下面的代碼實現：\x0d\x0a\x0d\x0aimport java.io.File;\x0d\x0a\x0d\x0apublic class Test {\x0d\x0a public static void main(String args[]) {\x0d\x0a File file = new File("D:\\A\\B\\C");\x0d\x0a file.mkdirs();\x0d\x0a \x0d\x0a file = new File("D:\\A\\B\\D");\x0d\x0a file.mkdir();\x0d\x0a }\x0d\x0a}

java創建目錄

貼上正確代碼：你的代碼本來沒有什么問題的，但是只能夠通過DOS下去運行，如果要在eclipse這些工具運行只能在arguments里面輸入參數，謝謝采納

import java.io.*;

import java.util.Scanner;

public class Exceptle13_1 {

public void newFolder(String newfolder) {

try {

String filepath = newfolder;

File myPath = new File(filepath);

if (!myPath.exists()) {

myPath.mkdir();

}

} catch (Exception e) {

System.out.println("新建目錄存在");

e.printStackTrace();

}

}

public static void main(String[] args) {

String mynewpath = new Scanner(System.in).next();

System.out.println(mynewpath);

Exceptle13_1 createNewFolder = new Exceptle13_1();

createNewFolder.newFolder(mynewpath);

}

}

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