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我的上传 servlet 不断向我抛出一个异常，说我试图替换的文件（接近我的代码末尾）无法（看似）随机删除。我不知道是什么原因造成的，因为我没有使用任何流并且文件没有在我的浏览器中打开。有谁知道这可能是什么原因造成的？我对此一无所知，因为代码对我来说似乎是正确的。这是我第一次使用 DiskFileItem，所以我不确定是否有任何细微差别需要处理。

请记住，它有时有效，有时无效。我迷路了。

问题领域：

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);
  }

我的系统输出总是说文件和目标都存在。我试图让上传覆盖现有文件。

完整代码：（& 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：要添加，getHome() 和“home”并没有真正在代码中，这只是为了保护我的主路径

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1 回答 1

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经过多次测试和恶化，终于在另一台机器上尝试了它，相同的代码，效果很好。与我在我的工作机器上转移域有关，并且它会弄乱权限。

于 2011-12-09T19:24:51.383 回答