How to delete files and directories in java
Nov 22, 2019 pm 05:01 PM
delete() method can be used to delete files or empty directories/folders. If the file is deleted, the delete() method returns true if the file does not exist. Return false.
If the directory is deleted, the delete() method checks whether the directory is empty. If the directory is empty, delete the directory, otherwise the delete() method will not perform any operation and return false, so In this case, all files must be deleted recursively and then the directory.
Another way to delete a non-empty directory is to use the Files.walkFileTree() method, in which all files can be processed one by one and called # on a single file object ##delete()Method.
package com.journaldev.files;import java.io.File;public class DeleteFileJava {
/**
* 此類顯示如何在Java中刪除文件
* @param args
*/
public static void main(String[] args) {
// 帶路徑的文件名
File file = new File("tmp/tmp2/file.txt");
if(file.delete()){
System.out.println("tmp/tmp2/file.txt File deleted");
}else System.out.println("File tmp/tmp2/file.txt doesn't exist");
// 只提供文件名稱
file = new File("file.txt");
if(file.delete()){
System.out.println("file.txt File deleted from Project root directory");
}else System.out.println("File file.txt doesn't exist in the project root directory");
//relative path
file = new File("temp/file.txt");
if(file.delete()){
System.out.println("temp/file.txt File deleted from Project root directory");
}else System.out.println("File temp/file.txt doesn't exist in the project root directory");
// 刪除空的目錄
file = new File("temp");
if(file.delete()){
System.out.println("temp directory deleted from Project root directory");
}else System.out.println("temp directory doesn't exist or not empty in the project root directory");
// 試圖刪除非空目錄
file = new File("D:/user/maxsu/project");
if(file.delete()){
System.out.println("D:/user/maxsu/project directory deleted from Project root directory");
}else System.out.println("D:/user/maxsu/project directory doesn't exist or not empty");
}}Note: Unlike createNewFile(), the delete method does not throw an IOException.
The following is a simple program that demonstrates how to delete a non-empty directory. If the directory contains files, deleting the directory will not succeed. Example of deleting a directory:import java.io.File;public class JavaDeleteDirectory {
public static void main(String[] args) {
File dir = new File("D:/worksp/java/log");
if(dir.isDirectory() == false) {
System.out.println("Not a directory. Do nothing");
return;
}
File[] listFiles = dir.listFiles();
for(File file : listFiles){
System.out.println("Deleting "+file.getName());
file.delete();
}
//現(xiàn)在目錄為空，所以可以刪除它
System.out.println("Deleting Directory. Success = "+dir.delete());
}}Example of deleting a directory recursively: import java.io.IOException;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
public class JavaDeleteDirectoryRecursively {
public static void main(String[] args) throws IOException {
Path directory = Paths.get("D:/worksp/maxsu/log");
Files.walkFileTree(directory, new SimpleFileVisitor<Path>() {
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attributes) throws IOException {
Files.delete(file); // 有效，因為它始終是一個文件
return FileVisitResult.CONTINUE;
}
@Override
public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
Files.delete(dir); //這將起作用，因為目錄中的文件已被刪除
return FileVisitResult.CONTINUE;
}
});
}}Recommended tutorial: The above is the detailed content of How to delete files and directories in java. For more information, please follow other related articles on the PHP Chinese website!
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