java.lang.NumberFormatException:对于输入字符串:"&引用;发生

java.lang.NumberFormatException:对于输入字符串:"&引用;发生,java,Java,我在服务器端部署应用程序时遇到了一个问题(在本地机器上,一切正常)。在我的应用程序中,用户可以使用multiupload上载文件。这是我的控制器: @Controller public class FileUploadController { @Autowired private StoryService storyService; @Autowired private PhotoService photoService; @RequestMappi

我在服务器端部署应用程序时遇到了一个问题(在本地机器上,一切正常)。在我的应用程序中,用户可以使用multiupload上载文件。这是我的控制器:

@Controller
public class FileUploadController {

    @Autowired
    private StoryService storyService;

    @Autowired
    private PhotoService photoService;

    @RequestMapping("/uploader")
    public String home() {

        // will be resolved to /views/fileUploader.jsp
        return "admin/fileUploader";
    }

    @RequestMapping(value = "/admin/story/upload", method = RequestMethod.POST)
    public @ResponseBody
    String upload(MultipartHttpServletRequest request,
                              HttpServletResponse response, HttpServletRequest req) throws IOException {

        //get story id
        Integer story_id = Integer.valueOf(req.getParameter("story_id"));
        Story story = storyService.findById(story_id);

        // Getting uploaded files from the request object
        Map<String, MultipartFile> fileMap = request.getFileMap();

        // Iterate through the map
        for (MultipartFile multipartFile : fileMap.values()) {

            // Save the file to local disk
            String name = Long.toString(System.currentTimeMillis());

            //original size
            saveFileToLocalDisk(multipartFile, name + ".jpg");

            //medium size
            Thumbnails.of(convertMultifileToFile(multipartFile)).size(1800, 2400)
                    .toFile(new File(getDestinationLocation() + "medium_" + name));

            //thumbnail size
            Thumbnails.of(convertMultifileToFile(multipartFile)).size(600, 800)
                    .toFile(new File(getDestinationLocation() + "thumb_" + name));


            //Save to db
            savePhoto(multipartFile, name, story);
        }
        return "redirect:/admin";
    }

    private void saveFileToLocalDisk(MultipartFile multipartFile, String name)
            throws IOException, FileNotFoundException {

        FileCopyUtils.copy(multipartFile.getBytes(), new FileOutputStream(getDestinationLocation() +
                name));
    }

    private String getOutputFilename(MultipartFile multipartFile) {

        return getDestinationLocation() + multipartFile.getOriginalFilename();
    }

    private Photo savePhoto(MultipartFile multipartFile, String name, Story story)
            throws IOException {

        Photo photo = new Photo();
        if (story != null) {
            photo.setName(name);
            photo.setStory(story);
            photoService.addPhoto(photo);
        }
        return photo;
    }

    private String getDestinationLocation() {
        return "/var/www/static/images/";
    }

    public File convertMultifileToFile(MultipartFile file) throws IOException
    {
        File convFile = new File(file.getOriginalFilename());
        convFile.createNewFile();
        FileOutputStream fos = new FileOutputStream(convFile);
        fos.write(file.getBytes());
        fos.close();
        return convFile;
    }
}
无法理解它的含义以及如何解决它。顺便说一句,我注意到当我上传100-200KB的文件时,一切正常,当文件大小为4-5MB时,我会遇到异常

提前谢谢

Integer.valueOf(req.getParameter(“story_id”))req.getParameter(“story\u id”)
返回一个空字符串,则code>将给出此异常,因为空字符串不能被解析为
整数

似乎并非总是设置
“story\u id”
;与文件大小的关联可能是巧合,也可能不是巧合

您应该通过将
“story\u id”
参数视为可选参数来保护代码不受这样的客户端错误的影响。这对于所有请求参数都是一个好主意,因为它可以防止服务器端在格式不正确的请求上崩溃:

String storyIdStr = req.getParameter("story_id");
if (storyIdStr == null || storyIdStr.length() == 0) {
    // Deal with the error
}
Integer story_id = null;
try {
    story_id = Integer.valueOf(storyIdStr);
} catch (NumberFormatException nfe) {
    // Deal with the error
}

你在Java 8中使用过注释@notnull或类似的东西吗?@KickButtowski我不确定它在这里是否会有很大帮助,因为
story\u id
似乎被设置为空字符串,而不是
null
。我明白了,但你使用过我提到的注释吗?@KickButtowski没有,我从来没有使用过这个注释(我也从来没有在工作中使用过Java8)。我在看一个关于Java8的视频,有这样一个注释,但是我没有找到任何关于它的有用信息。你应该看看
String storyIdStr = req.getParameter("story_id");
if (storyIdStr == null || storyIdStr.length() == 0) {
    // Deal with the error
}
Integer story_id = null;
try {
    story_id = Integer.valueOf(storyIdStr);
} catch (NumberFormatException nfe) {
    // Deal with the error
}