springboot系列16:文件上传
文件上传用到的场景也比较多,如头像的修改、相册应用、附件的管理等等,今天就来学习下在springboot框架下应用文件上传技术。
1、pom 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-thymeleaf</artifactId> </dependency> </dependencies>
2、application.properties配置上传文件的大小
spring.servlet.multipart.max-file-size=10MB spring.servlet.multipart.max-request-size=10MB
3、上传页面
<!DOCTYPE html> <html xmlns:th="http://www.thymeleaf.org"> <body> <h1>Spring Boot file upload example</h1> <form method="POST" action="/upload" enctype="multipart/form-data"> <input type="file" name="file" /><br/><br/> <input type="submit" value="上传" /> </form> </body> </html>
4、上传结果页面
<!DOCTYPE html> <html lang="en" xmlns:th="http://www.thymeleaf.org"> <body> <h1>SpringBoot - 文件上传结果</h1> <div th:if="${message}"> <h2 th:text="${message}"/> </div> </body> </html>
5、上传文件controller
@Controller public class UploadController { private static String UPLOADED_FOLDER = "E://temp//"; @GetMapping("/") public String index() { return "index"; } @PostMapping("/upload") public String singleFileUpload(@RequestParam("file") MultipartFile file, RedirectAttributes redirectAttributes) { if (file.isEmpty()) { redirectAttributes.addFlashAttribute("message", "请选择一个文件上传"); return "redirect:uploadStatus"; } try { byte[] bytes = file.getBytes(); File pathFile = new File(UPLOADED_FOLDER); if (!pathFile.exists()){ pathFile.mkdirs(); } Path path = Paths.get(UPLOADED_FOLDER + file.getOriginalFilename()); Files.write(path, bytes); redirectAttributes.addFlashAttribute("message", "文件上传成功:'" + file.getOriginalFilename() + "'"); } catch (IOException e) { e.printStackTrace(); } return "redirect:/result"; } @GetMapping("/result") public String result() { return "result"; } }