接收上传的multi-file的文件(四)
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接收上传的multi-file的文件(四)
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構建工程
為例創建一個springmvc工程你需要spring-boot-starter-thymeleaf和 spring-boot-starter-web的起步依賴。為例能夠上傳文件在服務器，你需要在web.xml中加入標簽做相關的配置，但在sringboot 工程中，它已經為你自動做了，所以不需要你做任何的配置。
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | <dependencies> ??????<dependency> ??????????<groupId>org.springframework.boot</groupId> ??????????<artifactId>spring-boot-starter-web</artifactId> ??????</dependency> ??????<dependency> ??????????<groupId>org.springframework.boot</groupId> ??????????<artifactId>spring-boot-starter-test</artifactId> ??????????<scope>test</scope> ??????</dependency> ??????<dependency> ??????????<groupId>org.springframework.boot</groupId> ??????????<artifactId>spring-boot-starter-thymeleaf</artifactId> ??????</dependency> ??</dependencies> |
創建文件上傳controller
直接貼代碼：
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 | @Controller public?class?FileUploadController { ????private?final?StorageService storageService; ????@Autowired ????public?FileUploadController(StorageService storageService) { ????????this.storageService = storageService; ????} ????@GetMapping("/") ????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:/"; ????} ????@ExceptionHandler(StorageFileNotFoundException.class) ????public?ResponseEntity handleStorageFileNotFound(StorageFileNotFoundException exc) { ????????return?ResponseEntity.notFound().build(); ????} } |
這個類通過@Controller注解，表明自己上一個Spring mvc的c。每個方法通過?
@GetMapping 或者@PostMapping注解表明自己的 http方法。
- GET / 獲取已經上傳的文件列表
- GET /files/{filename} 下載已經存在于服務器的文件
- POST / 上傳文件給服務器
創建一個簡單的 html模板
為了展示上傳文件的過程，我們做一個界面：?
在src/main/resources/templates/uploadForm.html
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | <html xmlns:th="http://www.thymeleaf.org"> <body> ????<div th:if="${message}"> ????????<h2 th:text="${message}"/> ????</div> ????<div> ????????<form method="POST"?enctype="multipart/form-data"?action="/"> ????????????<table> ????????????????<tr><td>File to upload:</td><td><input type="file"?name="file"?/></td></tr> ????????????????<tr><td></td><td><input type="submit"?value="Upload"?/></td></tr> ????????????</table> ????????</form> ????</div> ????<div> ????????<ul> ????????????<li th:each="file : ${files}"> ????????????????<a th:href="${file}"?th:text="${file}"?/> ????????????</li> ????????</ul> ????</div> </body></html> |
上傳文件大小限制
如果需要限制上傳文件的大小也很簡單，只需要在springboot 工程的src/main/resources/application.properties 加入以下：
| 1 2 | spring.http.multipart.max-file-size=128KB spring.http.multipart.max-request-size=128KB |
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轉載于:https://www.cnblogs.com/MaxElephant/p/10231949.html
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