接收上傳的multi-file的文件(四)

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。

 <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：

 @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

 <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：

 spring.http.multipart.max-file-size=128KB
spring.http.multipart.max-request-size=128KB

?

轉載于:https://www.cnblogs.com/MaxElephant/p/10231949.html

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