java - Spring Boot上传永久文件

Question

我正在尝试使用 Spring Boot 上传文件，但每次重新启动服务器时，我上传的文件都会消失。Spring Boot 创建名为 upload-dir 的文件，每次我重新启动服务器时，该文件都会被删除并重新创建，所以我不知道在哪里上传和存储我的文件。

我的文件上传 Controller 代码:

package com.theligue.webservice;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.Resource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.mvc.method.annotation.MvcUriComponentsBuilder;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import com.theligue.webservice.storage.StorageFileNotFoundException;
import com.theligue.webservice.storage.StorageService;

import java.io.IOException;
import java.util.stream.Collectors;

@Controller
public class FileUploadController {

    private final StorageService storageService;

    @Autowired
    public FileUploadController(StorageService storageService) {
        this.storageService = storageService;
    }

    @GetMapping("/uploadPOC")
    public String listUploadedFiles(Model model) throws IOException {
        model.addAttribute("files", storageService
                .loadAll()
                .map(path ->
                        MvcUriComponentsBuilder
                                .fromMethodName(FileUploadController.class, "serveFile", path.getFileName().toString())
                                .build().toString())
                .collect(Collectors.toList()));
        return "uploadForm";
    }





    @GetMapping("/files/{filename:.+}")
    @ResponseBody
    public ResponseEntity<Resource> serveFile(@PathVariable String filename) {
        Resource file = storageService.loadAsResource(filename);
        return ResponseEntity
                .ok()
                .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\""+file.getFilename()+"\"")
                .body(file);
    }

    @PostMapping("/")
    public String handleFileUpload(@RequestParam("file") MultipartFile file,
                                   RedirectAttributes redirectAttributes) {
        storageService.store(file); 
        redirectAttributes.addFlashAttribute("message",
                "You successfully uploaded " + file.getOriginalFilename() + "!");

        return "redirect:/uploadPOC/";
    }

    @ExceptionHandler(StorageFileNotFoundException.class)
    public ResponseEntity handleStorageFileNotFound(StorageFileNotFoundException exc) {
        return ResponseEntity.notFound().build();
    }

}

Answer 1

我认为您正在使用 spring boot 示例？因此，您只需在 Application.init() 中删除 storageService.deleteAll() 调用，该调用会在启动时删除所有上传的文件。