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1. pom .xml
<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>
2. application.properties
spring. servlet .multipart.max-request-size=10MB
spring.servlet.multipart.max-file-size=10MB
3. html
upload.html
<!DOCTYPE html>
<html xmlns:th="">
<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="提交" />
</form>
</body>
</html>
resut.html
<!DOCTYPE html>
<html lang="en" xmlns:th="">
<body>
<div th:if="${ message }">
<h2 th:text="${message}"/>
</div>
</body>
</html>
4. SampleController
@Controller
public class SampleController {
@GetMapping("/")
public String upload() {
return "upload";
}
@RequestMapping("/result")
public String result() {
return "result";
}
@PostMapping("/upload")
public String singleFileUpload(@RequestParam("file") MultipartFile file, RedirectAttributes redirectAttributes) {
if (file.isEmpty()) {
redirectAttributes.addFlashAttribute("message", "Please select a file to upload");
return "redirect:result";
}
try {
// Get the file and save it somewhere
byte[] bytes = file.getBytes();
Path path = Paths.get(uploadDirectory() + "/" + file.getOriginalFilename());
Files.write(path, bytes);
redirectAttributes.addFlashAttribute("message",
file.getOriginalFilename() + " upload success");
} catch (IOException e) {
e.printStackTrace();
}
return "redirect:/result";
}
private String uploadDirectory() throws FileNotFoundException {
//获取跟目录
File path = new File(ResourceUtils.getURL(" classpath :").getPath());
if(!path.exists()) path = new File("");
System.out.println("path:"+path.getAbsolutePath());
//如果上传目录为/ static /images/upload/，则可以如下获取：
File upload = new File(path.getAbsolutePath(),"static/upload/");
if(!upload.exists()) upload.mkdirs();
System.out.println("upload url:"+upload.getAbsolutePath());
//在开发测试模式时，得到的地址为：{项目跟目录}/target/static/images/upload/
//在打包成jar正式发布时，得到的地址为：{发布jar包目录}/static/images/upload/
return upload.getAbsolutePath();
}
}
5.访问 localhost:8080/
选择上传文件进行上传
