Java如何删除文件？代码实现详细示例 - 文件处理

2021年3月28日15:47:13 发表评论 1,086 次浏览

Java如何删除文件？别担心，Java提供了使用Java删除文件的方法进行文件处理。与任何操作系统中的正常删除操作相反, 使用java删除的文件将被永久删除, 而不会移动到垃圾回收站，所以删除文件要小心处理。

方法1：Java如何删除文件？以下是用于Java删除文件的方法

使用java.io.File.delete()函数：删除此抽象路径名表示的文件或目录。

语法如下：

public boolean delete()
Returns: true if and only if the file or 
directory is successfully deleted; false otherwise

// Java program to delete a file 
import java.io.*;
  
public class Test
{
     public static void main(String[] args)
     {
         File file = new File( "C:\\Users\\Mayank\\Desktop\\1.txt" );
          
         if (file.delete())
         {
             System.out.println( "File deleted successfully" );
         }
         else
         {
             System.out.println( "Failed to delete the file" );
         }
     }
}

输出如下：

File deleted successfully

方法2：Java如何删除文件？Java删除文件使用在文件包中定义的java.nio.file.files.deleteifexists(Path p)方法：

此方法删除文件(如果存在)。仅当目录不为空时, 它也会删除路径中提到的目录。

语法如下：

public static boolean deleteIfExists(Path path) throws IOException
Parameters: path - the path to the file to delete
Returns: true if the file was deleted by this method; 
false if the file could not be deleted because it did not exist.
Throws: 
DirectoryNotEmptyException - if the file is a directory and 
could not otherwise be deleted because the directory is not empty
(optional specific exception)
IOException - if an I/O error occurs

// Java program to demonstrate delete using Files class
import java.io.IOException;
import java.nio.file.*;
  
public class Test
{
     public static void main(String[] args)
     {
         try
         {
             Files.deleteIfExists(Paths.get("C:\\Users\\Mayank\\Desktop\\
             445 .txt"));
         }
         catch (NoSuchFileException e)
         {
             System.out.println( "No such file/directory exists" );
         }
         catch (DirectoryNotEmptyException e)
         {
             System.out.println( "Directory is not empty." );
         }
         catch (IOException e)
         {
             System.out.println( "Invalid permissions." );
         }
          
         System.out.println( "Deletion successful." );
     }
}

输出如下：