1. 在线文档
2. 项目结构

   1.源码克隆：git clone https://github.com/spring-guides/gs-uploading-files.git
   2.包含两个项目initial和complete，initial可以根据文档练习完善，complete是完整项目
   3.功能描述：构建接受文件上传的应用程序，并且通过简单的 HTML 界面来测试文件上传下载

   

   

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3. 源码分析

   1.POM依赖org.springframework.bootspring-boot-starter-thymeleaforg.springframework.bootspring-boot-starter-weborg.springframework.bootspring-boot-starter-testtest

   2.入口类
   // https://blog.csdn.net/tongxin_tongmeng/article/details/128401278
   @SpringBootApplication
   // https://blog.csdn.net/tongxin_tongmeng/article/details/128401815
   @EnableConfigurationProperties(StorageProperties.class)
   public class UploadingFilesApplication {
   
   	public static void main(String[] args) {
   		SpringApplication.run(UploadingFilesApplication.class, args);
   	}
   
       // https://blog.csdn.net/tongxin_tongmeng/article/details/128402169
   	@Bean
   	CommandLineRunner init(StorageService storageService) {
   		return (args) ->{
   			storageService.deleteAll();
   			storageService.init();
   		};
   	}
   }

   3.控制器
   @Controller
   public class FileUploadController {
   
   	private final StorageService storageService;
   
   	// https://blog.csdn.net/tongxin_tongmeng/article/details/128402579
   	@Autowired
   	public FileUploadController(StorageService storageService) {
   		this.storageService = storageService;
   	}
   
   	// https://blog.csdn.net/tongxin_tongmeng/article/details/128405403
   	@GetMapping("/")
   	public String listUploadedFiles(Model model) throws IOException {
   
   		model.addAttribute("files", storageService.loadAll().map(
   				path ->MvcUriComponentsBuilder.fromMethodName(FileUploadController.class,
   						"serveFile", path.getFileName().toString()).build().toUri().toString())
   				.collect(Collectors.toList()));
   
   		return "uploadForm";
   	}
   
   	@GetMapping("/files/{filename:.+}")
   	// https://blog.csdn.net/tongxin_tongmeng/article/details/128406009
   	@ResponseBody
   	public ResponseEntityserveFile(@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);
   		// https://blog.csdn.net/tongxin_tongmeng/article/details/128406963
   		redirectAttributes.addFlashAttribute("message",
   				"You successfully uploaded " + file.getOriginalFilename() + "!");
   
   		return "redirect:/";
   	}
   
   	// https://blog.csdn.net/tongxin_tongmeng/article/details/128406477
   	@ExceptionHandler(StorageFileNotFoundException.class)
   	public ResponseEntityhandleStorageFileNotFound(StorageFileNotFoundException exc) {
   		return ResponseEntity.notFound().build();
   	}
   
   }

4. 项目演示
   

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