Question

我上传的servlet一直在向我抛出一个异常，说我试图替换的文件（在我的代码末尾附近）无法在（看似）随机删除。我不知道是什么导致这个，因为我没有使用任何流，并且文件未在我的浏览器中打开。有谁知道是什么原因引起的？我完全不知道这个代码对我来说是正确的。这是我第一次使用DiskFileItem，所以我不确定是否有任何细微差别来处理。

请记住，它有时会起作用，有时却不起作用。我迷失了。

问题区域：

File destination = new File(wellnessDir + File.separator + fileName + ".pdf");

  System.out.println("destination file exists: " + destination.exists());
  System.out.println("file to be moved exists: " + uploadedFile.exists());

  if(destination.exists()){
    boolean deleted = destination.delete();
    if(!deleted)
      throw new Exception("Could not delete file at " + destination);
  }

我的系统总是说文件和目的地都存在。我正试图让上传覆盖现有文件。

完整代码：（＆amp; pastebin）

private void uploadRequestHandler(ServletFileUpload upload, HttpServletRequest request)
  {
    // Handle the request
    String fileName = "blank";
    try{         
      List items = upload.parseRequest(request);
      //Process the uploaded items
      Iterator iter = items.iterator();
      File uploadedFile = new File(getHome() + File.separator + "temp");
      if(uploadedFile.exists()){
        boolean tempDeleted = uploadedFile.delete();
        if(!tempDeleted)
          throw new Exception("Existing temp file could not be deleted.");
      }
      //write the file
      while (iter.hasNext()) {
        DiskFileItem item = (DiskFileItem) iter.next();
        if(item.isFormField()){
          String fieldName = item.getFieldName();
          String fieldValue = item.getString();
          if(fieldName.equals("fileName"))
            fileName = fieldValue;
            //other form values would need to be handled here, right now only need for fileName
        }else{
          item.write(uploadedFile);
        }
      }
      if(fileName.equals("blank"))
        throw new Exception("File name could not be parsed.");
      //move file
      File wellnessDir = new File(getHome() + File.separator + "medcottage" + File.separator + "wellness");
      File destination = new File(wellnessDir + File.separator + fileName + ".pdf");

      System.out.println("destination file exists: " + destination.exists());
      System.out.println("file to be moved exists: " + uploadedFile.exists());

      if(destination.exists()){
        boolean deleted = destination.delete();
        if(!deleted)
          throw new Exception("Could not delete file at " + destination);
      }        
      FileUtil.move(uploadedFile, new File(wellnessDir + File.separator + fileName + ".pdf"));
      writeResponse();
    } catch (Exception e) {
      System.out.println("Error handling upload request.");
      e.printStackTrace();
    }
  }

编辑：添加，getHome（）和“home”不在代码中，这只是为了保护我的家庭路径

Answer 1

经过多次测试和加重，最后在不同的机器上尝试了它，相同的代码，效果很好。与我在工作机器上传输域名有关，而且它与权限相关。

使用DiskFileItem时为什么会出现不确定的文件删除错误？

1 个答案: