`一、现象`

SpringBoot项目配置了配置了上传文件的最大值限制，当上传的文件超过最大值的限制时会抛出MaxUploadSizeExceededException异常，如下
此时通过@RestControllerAdvice全局异常捕获类，也无法捕获到该异常，导致结果无任何响应

2020-01-07 09:40:31 [http-nio-8081-exec-1] [ERROR] o.a.c.c.C.[.[.[/video].[dispatcherServlet] [175]- Servlet.service() for servlet [dispatcherServlet] in context with path [/video] threw exception [Request processing failed; nested exception is org.springframework.web.multipart.MaxUploadSizeExceededException: Maximum upload size exceeded; nested exception is java.lang.IllegalStateException: org.apache.tomcat.util.http.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (71091753) exceeds the configured maximum (1048576)] with root cause
org.apache.tomcat.util.http.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (71091753) exceeds the configured maximum (1048576)at org.apache.tomcat.util.http.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:808)at org.apache.tomcat.util.http.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:256)at org.apache.tomcat.util.http.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:280)at org.apache.catalina.connector.Request.parseParts(Request.java:2868)at org.apache.catalina.connector.Request.parseParameters(Request.java:3196)at org.apache.catalina.connector.Request.getParameter(Request.java:1113)at org.apache.catalina.connector.RequestFacade.getParameter(RequestFacade.java:381)at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:85)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:860)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1589)at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Thread.java:748)

`二、在SpringBoot的application.properties文件中加上如下配置`

spring.servlet.multipart.max-file-size = 50MB
spring.servlet.multipart.max-request-size = 50MB
spring.servlet.multipart.resolve-lazily=true #设置为懒加载，不然依然会捕获不到异常
server.tomcat.max-swallow-size = 100MB # 最重要的是这一行,可设置为 -1 不作限制

注意: 上面最重要的是要配置内嵌的 tomcat 的最大吞吐量即 max-swallow-size，可以设置 -1 不限制，也可以设置一下比较大的数字。当上传文件超 tomcat 的大小限制后会先于 Controller 触发异常，所以这时我们的异常处理类无法捕获 Controller 层的异常了，这就是无法捕获到异常的根本原因。

配置全局异常类，用于捕获MaxUploadSizeExceededException 异常

@RestControllerAdvice(annotations = {ControllerAdvice.class, RestController.class})
public class GlobalExceptionHandler {@ExceptionHandler(MultipartException.class)public ResponseResult uploadExcepttion(MultipartException e){return ResponseResult.failed(500, "上传失败");}
}

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SpringBoot 无法捕获 maximum upload size exceeded

`一、现象`

`二、在SpringBoot的application.properties文件中加上如下配置`

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