构建工程
为例创建一个springmvc工程你需要spring-boot-starter-thymeleaf和 spring-boot-starter-web的起步依赖。为例能够上传文件在服务器,你需要在web.xml中加入标签做相关的配置,但在sringboot 工程中,它已经为你自动做了,所以不需要你做任何的配置。
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<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> |
创建文件上传controller
直接贴代码:
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@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(); } } |
这个类通过@Controller注解,表明自己上一个Spring mvc的c。每个方法通过
@GetMapping 或者@PostMapping注解表明自己的 http方法。
- GET / 获取已经上传的文件列表
- GET /files/{filename} 下载已经存在于服务器的文件
- POST / 上传文件给服务器
创建一个简单的 html模板
为了展示上传文件的过程,我们做一个界面:
在src/main/resources/templates/uploadForm.html
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<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> |
上传文件大小限制
如果需要限制上传文件的大小也很简单,只需要在springboot 工程的src/main/resources/application.properties 加入以下:
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spring.http.multipart.max-file-size=128KB spring.http.multipart.max-request-size=128KB |