刪除在java中具有擴展名的所有文件

Question

因此，我發現前面的一些代碼看起來像它會工作，但它不會調用刪除文件來列出它們。我需要添加什麼才能刪除文件？

import java.io.File; 
import java.util.regex.Pattern; 

public class cleardir { 
    static String userprofile = System.getenv("USERPROFILE"); 

    private static void walkDir(final File dir, final Pattern pattern) { 
     final File[] files = dir.listFiles(); 
     if (files != null) {  
      for (final File file : files) {  
       if (file.isDirectory()) {   
        walkDir(file, pattern);  
        } else if (pattern.matcher(file.getName()).matches()) { 
         System.out.println("file to delete: " + file.getAbsolutePath()); 
         }  } } } 
    public static void main(String[] args) { 
     walkDir(new File(userprofile+"/Downloads/Software_Tokens"), 
       Pattern.compile(".*\\.sdtid")); 
     } 
} 

Answer 1

public class cleardir { 
static String userprofile = System.getenv("USERPROFILE"); 
    private static final String FILE_DIR = userprofile+"\\Downloads\\Software_Tokens"; 
    private static final String FILE_TEXT_EXT = ".sdtid"; 

    public static void run(String args[]) { 
    new cleardir().deleteFile(FILE_DIR,FILE_TEXT_EXT); 
    } 

    public void deleteFile(String folder, String ext){ 

    GenericExtFilter filter = new GenericExtFilter(ext); 
    File dir = new File(folder); 
    if (dir.exists()) { 
    //list out all the file name with .txt extension 
    String[] list = dir.list(filter); 

    if (list.length == 0) return; 

    File fileDelete; 

    for (String file : list){ 
    String temp = new StringBuffer(FILE_DIR) 
         .append(File.separator) 
         .append(file).toString(); 
     fileDelete = new File(temp); 
     boolean isdeleted = fileDelete.delete(); 
     System.out.println("file : " + temp + " is deleted : " + isdeleted); 
    } 
    } 
    } 
    //inner class, generic extension filter 
    public class GenericExtFilter implements FilenameFilter { 

     private String ext; 

     public GenericExtFilter(String ext) { 
     this.ext = ext;    
     } 

     public boolean accept(File dir, String name) { 
     return (name.endsWith(ext)); 
     } 
    } 
} 

Answer 2

要刪除一個文件，你可以調用delete功能

Answer 3

一旦有文件路徑，刪除他：

File physicalFile = new File(path); // This is one of your file objects inside your for loop, since you already have them just delete them. 
try { 
    physicalFile.delete(); //Returns true if the file was deleted or false otherwise. 
          //You might want to know this just in case you need to do some additional operations based on the outcome of the deletion. 
} catch(SecurityException securityException) { 
    //TODO Handle. 
    //If you haven't got enough rights to access the file, this exception is thrown. 
} 

Answer 4

您可以調用刪除（）方法在文件的一個實例上。務必檢查返回碼以確保您的文件實際上已被刪除。

Answer 5

爲每個要刪除的文件調用File.delete()。所以你的代碼是：

import java.io.File; 
import java.util.regex.Pattern; 

public class cleardir { 
    static String userprofile = System.getenv("USERPROFILE"); 

    private static void walkDir(final File dir, final Pattern pattern) { 
     final File[] files = dir.listFiles(); 
     if (files != null) {  
      for (final File file : files) {  
       if (file.isDirectory()) {   
        walkDir(file, pattern);  
        } else if (pattern.matcher(file.getName()).matches()) { 
         System.out.println("file to delete: " + file.getAbsolutePath()); 
         boolean deleteSuccess=file.delete(); 
         if(!deleteSuccess)System.err.println("[warning]: "+file.getAbsolutePath()+" was not deleted..."); 
        } 
       } 
      } 
     } 

public static void main(String[] args) { 
    walkDir(new File(userprofile+"/Downloads/Software_Tokens"), 
      Pattern.compile(".*\\.sdtid")); 
    } 
} 

Answer 6

使用file.delete();來刪除文件。

在嘗試編寫程序之前，您需要正確學習Java基礎知識。良好的資源：http://docs.oracle.com/javase/tutorial/index.html

Answer 7

final File folder = new File("C:/Temp"); 
     FileFilter ff = new FileFilter() { 

      @Override 
      public boolean accept(File pathname) { 
       String ext = FilenameUtils.getExtension(pathname.getName()); 
       return ext.equalsIgnoreCase("EXT"); //Your extension 
      } 
     }; 
     final File[] files = folder.listFiles(ff); 
     for (final File file : files) { 
      file.delete(); 
     }