Java：如何处理文件大小超过tomcat的异常

Question

我正在处理 spring boot 项目，在该项目中我想处理最大文件大小超出异常（我只想上传那些大小小于 10MB 的文件，如果有人尝试上传大于 10 MB 的文件，它应该返回一条消息而不是例外），在互联网上搜索后，我尝试了所有可能的解决方案，但没有任何效果

任何人都可以告诉我这件事吗？

文件上传控制器.class

@ControllerAdvice
@Controller
public class FileUploadController extends ResponseEntityExceptionHandler{
@ExceptionHandler(MaxUploadSizeExceededException.class)
    @RequestMapping(method = RequestMethod.POST, value = "/uploadChildPhoto/{childId}", produces = "application/json")
    public @ResponseBody ResponseEntity<?> uploadChildPhoto(Authentication authentication,
            @PathVariable("childId") Long childId, @RequestParam("file") MultipartFile file,MaxUploadSizeExceededException exc) {
        try {
            if (!file.isEmpty()) {
                ChildPhoto createdPhoto = childService.createChildPhoto(file, childId);
                return ResponseEntity.ok(createdPhoto);
            } else {
                throw new RuntimeException(
                        "You failed to upload " + file.getOriginalFilename() + " because the file was empty");
            }
        } catch (MultipartException ex) {
            ex.printStackTrace();
            return ResponseEntity.status(HttpStatus.NOT_ACCEPTABLE).body("File size error");
        }
    }
}

例外

org.apache.tomcat.util.http.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (14816520) exceeds the configured maximum (10485760)
    at org.apache.tomcat.util.http.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:805) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.tomcat.util.http.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:256) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.tomcat.util.http.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:280) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.connector.Request.parseParts(Request.java:2864) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.connector.Request.parseParameters(Request.java:3211) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.connector.Request.getParameter(Request.java:1137) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.connector.RequestFacade.getParameter(RequestFacade.java:381) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:75) ~[spring-web-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) ~[spring-web-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.13.RELEASE.jar:4.3.13.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478) [tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) [tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) [tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803) [tomcat-embed-core-8.5.23.jar:8.5.23]

最大文件大小

spring.http.multipart.max-file-size=10MB
spring.http.multipart.max-request-size=10MB

Answer 1

由于 tomcat 抛出异常，您无法处理它。因此，您需要告诉 tomcat 允许上传所有大小的文件并在控制器级别处理该大小。

将多部分属性设置为以下多部分： max-file-size：-1 max-request-size：-1

在控制器上设置 Tomcat 8 (maxSwallowSize="-1")，添加逻辑以检查大小

if(fileAttachment.getSize() > 10485760 ) { throw new MaxUploadSizeExceededException(fileAttachment.getSize()); }