spring boot 上传文件过大失败

报错

org.apache.tomcat.util.http.fileupload.FileUploadBase SizeLimitExceededException:therequestwasrejectedbecauseitssize(48460543)exceedstheconfiguredmaximum(10485760)atorg.apache.tomcat.util.http.fileupload.FileUploadBase FileItemIteratorImpl.(FileUploadBase.java:811) ~[tomcat-embed-core-8.5.15.jar:8.5.15]
at org.apache.tomcat.util.http.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:256) ~[tomcat-embed-core-8.5.15.jar:8.5.15]
at org.apache.tomcat.util.http.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:280) ~[tomcat-embed-core-8.5.15.jar:8.5.15]
at org.apache.catalina.connector.Request.parseParts(Request.java:2871) ~[tomcat-embed-core-8.5.15.jar:8.5.15]
at org.apache.catalina.connector.Request.parseParameters(Request.java:3215) ~[tomcat-embed-core-8.5.15.jar:8.5.15]
at org.apache.catalina.connector.Request.getParameter(Request.java:1145) ~[tomcat-embed-core-8.5.15.jar:8.5.15]
at org.apache.catalina.connector.RequestFacade.getParameter(RequestFacade.java:381) ~[tomcat-embed-core-8.5.15.jar:8.5.15]
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:75) ~[spring-web-5.0.0.BUILD-20170531.205527-248.jar:5.0.0.BUILD-SNAPSHOT]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.0.BUILD-20170531.205527-248.jar:5.0.0.BUILD-SNAPSHOT]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.15.jar:8.5.15]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.15.jar:8.5.15]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) ~[spring-web-5.0.0.BUILD-20170531.205527-248.jar:5.0.0.BUILD-SNAPSHOT]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.0.BUILD-20170531.205527-248.jar:5.0.0.BUILD-SNAPSHOT]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.15.jar:8.5.15]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.15.jar:8.5.15]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) ~[tomcat-embed-core-8.5.15.jar:8.5.15]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-8.5.15.jar:8.5.15]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478) [tomcat-embed-core-8.5.15.jar:8.5.15]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.15.jar:8.5.15]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80) [tomcat-embed-core-8.5.15.jar:8.5.15]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.15.jar:8.5.15]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) [tomcat-embed-core-8.5.15.jar:8.5.15]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799) [tomcat-embed-core-8.5.15.jar:8.5.15]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.15.jar:8.5.15]
at org.apache.coyote.AbstractProtocol ConnectionHandler.process(AbstractProtocol.java:861)[tomcat−embed−core−8.5.15.jar:8.5.15]atorg.apache.tomcat.util.net.NioEndpoint SocketProcessor.doRun(NioEndpoint.java:1455) [tomcat-embed-core-8.5.15.jar:8.5.15]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.15.jar:8.5.15]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_111]
at java.util.concurrent.ThreadPoolExecutor Worker.run(ThreadPoolExecutor.java:617)[na:1.8.0111]atorg.apache.tomcat.util.threads.TaskThread WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.15.jar:8.5.15]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_111]

添加配置

再main方法类中增加
@Bean
public MultipartConfigElement multipartConfigElement(){
MultipartConfigFactory config = new MultipartConfigFactory();
config.setMaxFileSize(“80MB”);
config.setMaxRequestSize(“100MB”);
return config.createMultipartConfig();
}
即可解决问题

为什么在application.properties中添加不管用

是因为在spring boot 1.4之后更改了配置方法，造成了在application.properties失效，必须使用@Bean的方式在main方法中注入才行。