如何在Spring Rest中的资源文件夹中上传文件

Question

I have a folder inside resources folder where I want to upload media files. But I am constantly getting 'No file or directory found' error.

Here is what I have in my controller

@Autowired
ServletContext servletContext;

@RequestMapping(value = "/uploads", method = RequestMethod.POST)
public String insert(@RequestParam("file") MultipartFile file, HttpServletRequest request) throws IOException {

    // String path = new
    // ClassPathResource("/src/main/resources/uploads").getPath();

    // FileCopyUtils.copy(file.getBytes(), new File(path));

    String webappRoot = servletContext.getRealPath("/");
    String relativeFolder = File.separator + "resources" + File.separator + "uploads" + File.separator;
    System.out.println(webappRoot);
    System.out.println(relativeFolder);

    String filename = webappRoot + relativeFolder + file.getOriginalFilename();

    FileCopyUtils.copy(file.getBytes(), new File(filename));

    return "uploaded successfully";
}

And here is the error I am getting constantly

SEVERE: Servlet.service() for servlet [api] in context with path [/ek-service] threw exception
java.io.FileNotFoundException: /home/ekbana/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/ek-service/resources/uploads/2.jpg (No such file or directory)

I have searched all over the web tried ResourceLoader and ClassPath. But still no success figuring it out.

Answer 1

Resources should be considered read-only, they are not accessible through the file system, but are embedded in the war/jar when you deploy an application.

You must write the file to a path on the file system that exists and that your application has write access to.

You can write to a temporary file, it has the benefit that you most certainly will have write access to it. Useful for testing until you figure out a permanent location to store the file, or for cases when permanent storage is not necessary. See example: http://www.mkyong.com/java/how-to-create-temporary-file-in-java/