使用Java刪除文件

Question

    import java.io.*;

public class FileChecker {

   private static final String FILE_DIR = "F:/study/";
   private static final String FILE_TEXT_EXT1 = ".pdb";
   private static final String FILE_TEXT_EXT2 = ".ali";
   private static final String FILE_TEXT_EXT3 = ".txt";
   private static final String FILE_TEXT_EXT4 = ".py";
   private static final String FILE_TEXT_PREFIX1 = "target.";
   private static final String FILE_TEXT_PREFIX2 = "blastOutput.";
   //private static final String FILE_TEXT_PREFIX3 = "1OPL.";

  //public static void main(String args[]) 
   public FileChecker()
   {
/*new FileChecker().deleteFile(FILE_DIR,FILE_TEXT_EXT1);
        new FileChecker().deleteFile(FILE_DIR,FILE_TEXT_EXT2);
        new FileChecker().deleteFile(FILE_DIR,FILE_TEXT_EXT3);
       new FileChecker().deleteFile(FILE_DIR,FILE_TEXT_EXT4);
      new FileChecker().deleteFile2(FILE_DIR,FILE_TEXT_PREFIX1);
        new FileChecker().deleteFile2(FILE_DIR,FILE_TEXT_PREFIX2);
        new FileChecker().deleteFile2(FILE_DIR,FILE_TEXT_PREFIX3);*/
   }

   public void deleteFile(String folder, String ext){

     GenericExtFilter filter = new GenericExtFilter(ext);
     File dir = new File(folder);

     //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);
     }
   }
 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));
       }
    }

 public void deleteFile2(String folder, String prefix){

     GenericExt filter = new GenericExt(prefix);
     File dir = new File(folder);

     //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);
     }
   }
 public class GenericExt implements FilenameFilter {

       private String prefix;

       public GenericExt(String prefix) {
         this.prefix = prefix;             
       }

       public boolean accept(File dir, String name) {
         return (name.startsWith(prefix));
       }
    }  

 public void deleteFile3(String ID, String Chain)
 {
     File file = new File(ID+".pdb");
     if(file.delete())
     {
     System.out.println(ID+"deleted");
     }
     File file2 = new File(Chain+".pdb");
     if(file2.delete())
     {
      System.out.println(Chain+"deleted");
     }

 }


}

此代碼是從另一個類調用的。 當以我的幾個代碼連續運行時..特別是當我嘗試刪除特定文件擴展名的文件時，它不會刪除兩個pdb文件。 我也嘗試使用file.close（）關閉它們，然后在知道整個文件名和擴展名但又無濟於事的情況下再次將其刪除。

    String FILE_DIR = "F:/study";
    String FILE_TEXT_EXT1 = ".pdb";
  String FILE_TEXT_EXT2 = ".ali";
  String FILE_TEXT_EXT3 = ".txt";
  String FILE_TEXT_EXT4 = ".py";
    String FILE_TEXT_PREFIX1 = "target.";
  String FILE_TEXT_PREFIX2 = "blastOutput.";
 //  String FILE_TEXT_PREFIX3 = "1OPL.";


new FileChecker().deleteFile(FILE_DIR,FILE_TEXT_EXT1);
        new FileChecker().deleteFile(FILE_DIR,FILE_TEXT_EXT2);
        new FileChecker().deleteFile(FILE_DIR,FILE_TEXT_EXT3);
       new FileChecker().deleteFile(FILE_DIR,FILE_TEXT_EXT4);
      new FileChecker().deleteFile2(FILE_DIR,FILE_TEXT_PREFIX1);
        new FileChecker().deleteFile2(FILE_DIR,FILE_TEXT_PREFIX2);
   // new FileChecker().deleteFile2(FILE_DIR,FILE_TEXT_PREFIX3);
        BufferedWriter bw = new BufferedWriter(new FileWriter(FILE_DIR+TemplatePDBID+".pdb", true));
    bw.close();
    BufferedWriter bw1 = new BufferedWriter(new FileWriter(FILE_DIR+Template+".pdb", true));
    bw1.close();
    new FileChecker().deleteFile3((FILE_DIR+TemplatePDBID), (FILE_DIR+Template));

這是另一個類的代碼片段，該類最后調用了我的FileChecker類。

我要粘貼收到的內容

file : F:/study\1OPL.pdb is deleted : false
file : F:/study\1OPL_A.pdb is deleted : false
file : F:/study\model.pdb is deleted : true
file : F:/study\alignment.ali is deleted : true
file : F:/study\tempAli.ali is deleted : true
file : F:/study\1OPL.fasta.txt is deleted : true
file : F:/study\ModelDescription.txt is deleted : true
file : F:/study\ModellerOutput.txt is deleted : true
file : F:/study\script.py is deleted : true
file : F:/study\target.D00000001 is deleted : true
file : F:/study\target.ini is deleted : true
file : F:/study\target.rsr is deleted : true
file : F:/study\target.sch is deleted : true
file : F:/study\target.V99990001 is deleted : true
file : F:/study\blastOutput.xml is deleted : true

請幫助我解決這個異常。.我無法理解為什么它在所有情況下都跳過了前兩個文件。

Answer 1

另一個類不在期望的文件位置寫入F:/study （或至少在編輯之前沒有顯示的代碼），因此沒有文件。

另外，您可能想使用構造函數

File(File, String)

當瀏覽目錄列表時，即寫

 fileDelete = new File(dir, file)

而不是在StringBuffer中構造名稱。

Answer 2

給定您已編寫的代碼以及其他文件已成功刪除的事實，一個人只能得出結論，前兩個文件存在權限或鎖定問題，阻止了它們的刪除。 您是否嘗試從命令行刪除它們？