這篇文章主要介紹,如何在springboot工程做爲服務器,去接收經過http 上傳的multi-file的文件。html
爲例建立一個springmvc工程你須要spring-boot-starter-thymeleaf和 spring-boot-starter-web的起步依賴。爲例可以上傳文件在服務器,你須要在web.xml中加入標籤作相關的配置,但在sringboot 工程中,它已經爲你自動作了,因此不須要你作任何的配置。web
<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>複製代碼
直接貼代碼:spring
@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();
}
}複製代碼
這個類經過@Controller註解,代表本身上一個Spring mvc的c。每一個方法經過
@GetMapping 或者@PostMapping註解代表本身的 http方法。springboot
爲了展現上傳文件的過程,咱們作一個界面:
在src/main/resources/templates/uploadForm.htmlbash
<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>複製代碼
若是須要限制上傳文件的大小也很簡單,只須要在springboot 工程的src/main/resources/application.properties 加入如下:服務器
spring.http.multipart.max-file-size=128KB
spring.http.multipart.max-request-size=128KB複製代碼