存储个人资料图片的图像文件时出现问题

Question

我正在做一个大学的课程项目，并且负责使配置文件系统正常运行。我们的讲师给了我们一些示例代码，以使文件上传工作正常进行，我将用它来处理用户的个人资料图片，但是，即使我的代码看起来非常相似，我似乎也无法使它正常工作。问题是该文件实际上不会创建并保存在我的项目中，而讲师给我的代码却可以！

这是讲师给我的代码：

        NewsStory newsstory = new NewsStory();
        newsstory.uniqueid = "story_"+System.currentTimeMillis();
        newsstory.dateItWasPublished = System.currentTimeMillis();
        newsstory.title = toProcess.params.get("title");
        newsstory.description = toProcess.params.get("description");
        newsstory.journalists.add(toProcess.params.get("journalist"));
        newsstory.filepathToImage = toProcess.params.get("fileupload");

        File uploaded = new File(newsstory.filepathToImage);
        int ind = newsstory.filepathToImage.lastIndexOf('.');
        String extension = newsstory.filepathToImage.substring(ind);
        uploaded.renameTo(new File("httpdocs/"+newsstory.uniqueid+extension));
        newsstory.filepathToImage = newsstory.uniqueid+extension;
        //At this point you would normally add the newsstory to the database
        MVMap<String, NewsStory> newsStories = db.s.openMap("NewsStories");
        newsStories.put(newsstory.uniqueid, newsstory);

这基本上是从通过表单传入的fileupload参数中获取一个String并运行下面的代码。这是我的代码：

                    user.userEmail = toProcess.params.get("email");
                    user.profilePicturePath = toProcess.params.get("filepath");

                    System.out.println(user.profilePicturePath);

                    File uploaded = new File(user.profilePicturePath);
                    int ind = user.profilePicturePath.lastIndexOf('.');
                    String extension = user.profilePicturePath.substring(ind);
                    uploaded.renameTo(new File("httpdocs/"+user.username+"ProfilePicture"+extension));
                    user.profilePicturePath = user.username+"ProfilePicture"+extension;
                    System.out.println(user.profilePicturePath);

                    users.put(user.username, user);
                    db.commit();

有人知道我为什么会遇到这个问题吗？