//接受異常
@ControllerAdvice
public class GlobalExceptionHandler {
/**
* MaxUploadSizeExceededException異常的特殊之處在於，當上傳文件的大小超過限制時，它的拋出並是在進入Controller之前，
* 所以不能在controller中利用註解@ExceptionHandler（MaxUploadSizeExceededException.class）來定義該異常的處理方法；
* @param e
* @param redirectAttributes
* @return
*/
@ExceptionHandler(MaxUploadSizeExceededException.class)
public String handleError1(MaxUploadSizeExceededException e, RedirectAttributes redirectAttributes){
redirectAttributes.addFlashAttribute("message",e.getCause().getMessage());
//給前臺顯示
return "redirect:show";
}
}
@Controller
public class FileUploadController {
@GetMapping("/")
public String index(){
return "upload";
}
@PostMapping("/upload")
public String singleFileUpload(@RequestParam("file") MultipartFile file,
RedirectAttributes redirectAttributes) {
if (file.isEmpty()) {
//System.out.println(1);
redirectAttributes.addFlashAttribute("message", "Please select a file to u pload");
return "redirect:show";
}
try {
// Get the file and save it somewhere
byte[] bytes = file.getBytes();
// UPLOADED_FOLDER ⽂件本地存儲地址
Path path = Paths.get("D://file//" + file.getOriginalFilename());
Files.write(path, bytes);
redirectAttributes.addFlashAttribute("message",
"You successfully uploaded '" + file.getOriginalFilename() + "'");
} catch (IOException e) {
System.out.println(10);
e.printStackTrace();
}
return "redirect:show";
}
@GetMapping("/show")
public String show(){
return "show";
}
}
@SpringBootApplication
public class Application {
public static void main(String[] args) throws Exception{
SpringApplication.run(Application.class, args);
}
@Bean
public TomcatServletWebServerFactory tomcatEmbedded(){
TomcatServletWebServerFactory tomcat = new TomcatServletWebServerFactory();
tomcat.addConnectorCustomizers((TomcatConnectorCustomizer)connector ->{
if((connector.getProtocolHandler() instanceof AbstractHttp11JsseProtocol<?>)){
((AbstractHttp11Protocol<?>) connector.getProtocolHandler()).setMaxSwallowSize(-1);
}
});
return tomcat;
}
}
顯示給前端頁面的結果
show.html
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div th:text="${message}">
<h2 th:text="${message}"></h2>
</div>
</body>
</html>
upload.html
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>upload</title>
</head>
<body>
<form method="POST" action="/upload" enctype="multipart/form-data">
<input type="file" name="file" />
<br/>
<br/>
<input type="submit" value="Submit">
</form>
</body>
</html>
application.properties
#spring boot上傳文件
#MultipartFile 是 Spring 上傳⽂件的封裝類
#支持上傳的最大文件
spring.servlet.multipart.max-file-size= 100MB
#文件請求最大限制
spring.servlet.multipart.max-request-size= 100MB
#最大吞吐量即 max-swallow-size，可以設置 -1 不限制
server.tomcat.max-swallow-size = -1
如果沒加上server.tomcat.max-swallow-size = -1,前臺頁面顯示的結過會是這個
