使用Java删除文件

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");
     }

 }


}

此代码是从另一个类调用的。 当以我的几个代码连续运行时..特别是当我尝试删除特定文件扩展名的文件时，它不会删除两个pdb文件。 我也尝试使用file.close（）关闭它们，然后在知道整个文件名和扩展名但又无济于事的情况下再次将其删除。

    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));

这是另一个类的代码片段，该类最后调用了我的FileChecker类。

我要粘贴收到的内容

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

请帮助我解决这个异常。.我无法理解为什么它在所有情况下都跳过了前两个文件。

Answer 1

另一个类不在期望的文件位置写入F:/study （或至少在编辑之前没有显示的代码），因此没有文件。

另外，您可能想使用构造函数

File(File, String)

当浏览目录列表时，即写

 fileDelete = new File(dir, file)

而不是在StringBuffer中构造名称。

Answer 2

给定您已编写的代码以及其他文件已成功删除的事实，一个人只能得出结论，前两个文件存在权限或锁定问题，阻止了它们的删除。 您是否尝试从命令行删除它们？