Swagger-ui在文件上传时报错net::ERR_CONNECTION_RESET

我会带着你远行 2021-11-16 16:01 413阅读 0赞

Swagger-ui在文件上传时报错net::ERR\_CONNECTION\_RESET

项目版本

spring-boot 2.1.6.RELEASE

swagger 2.7.0

在使用swagger做接口测试的时候遇到了一个诡异的问题，在文件超过限制大小的时候，没有按照全局异常拦截返回相应的错误码，而是直接抛出了一个net::ERR\_CONNECTION\_RESET的报错，页面没有任何返回显示

测试代码如下

controller

@PostMapping
    @ApiOperation(value = "/upload", notes = "upload", httpMethod = "POST")
    public ResultVO<Void> upload(@RequestPart(name = "file") MultipartFile file) throws Exception {
    	saveFile(FILE_SAVE_PATH, file.getOriginalFilename(), file);
    	return ResultVO.success();
    }

全局异常拦截配置

@Slf4j
    @RestControllerAdvice
    public class GlobalExceptionHandler {
    
        @ExceptionHandler(value = Exception.class)
        public ResultVO<Void> exceptionHandler(Exception e) {
            log.info("go to global exception handler: {}", e);
            return ResultVO.error(ResultStateEnum.ERROR);
    
        }
    }

配置文件

server:
      port: 10001
    spring:
      application:
        name: spring-cloud-upload-swagger-demo
      servlet:
        multipart:
          max-file-size: 30MB
          max-request-size: 30MB

运行项目，打开swagger页面

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lpbmd6aWlzbWU_size_16_color_FFFFFF_t_70]

上传一个小于30MB的文件，得到成功的返回

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lpbmd6aWlzbWU_size_16_color_FFFFFF_t_70 1]

查看后台文件大小

INFO 1016 --- [io-10001-exec-1] c.m.d.u.s.controller.DemoController      : file:springcloudgateway.jpg, size:46343

再上传超过30MB的文件，则没有任何返回显示

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lpbmd6aWlzbWU_size_16_color_FFFFFF_t_70 2]  
查看控制台，显示报错信息  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lpbmd6aWlzbWU_size_16_color_FFFFFF_t_70 3]

查看后台打印，确实进入了全局异常

INFO 1016 --- [io-10001-exec-3] c.m.d.u.s.config.GlobalExceptionHandler  : go to global exception handler: {}
    
    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 (39356221) exceeds the configured maximum (31457280)
    	at org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.handleParseFailure(StandardMultipartHttpServletRequest.java:121) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    	at org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.parseRequest(StandardMultipartHttpServletRequest.java:114) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    	at org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.<init>(StandardMultipartHttpServletRequest.java:87) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    	at org.springframework.web.multipart.support.StandardServletMultipartResolver.resolveMultipart(StandardServletMultipartResolver.java:87) ~[spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    	at org.springframework.web.servlet.DispatcherServlet.checkMultipart(DispatcherServlet.java:1176) ~[spring-webmvc-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1011) ~[spring-webmvc-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942) ~[spring-webmvc-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005) [spring-webmvc-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:908) [spring-webmvc-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    	at javax.servlet.http.HttpServlet.service(HttpServlet.java:660) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882) [spring-webmvc-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    	at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) [tomcat-embed-websocket-9.0.21.jar:9.0.21]
    	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) [spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) [spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92) [spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) [spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) [spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) [spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) [spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109) [spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:853) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1587) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_191]
    	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_191]
    	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.21.jar:9.0.21]
    	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_191]
    Caused by: java.lang.IllegalStateException: org.apache.tomcat.util.http.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (39356221) exceeds the configured maximum (31457280)
    	at org.apache.catalina.connector.Request.parseParts(Request.java:2925) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.catalina.connector.Request.parseParameters(Request.java:3214) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.catalina.connector.Request.getParameter(Request.java:1116) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.catalina.connector.RequestFacade.getParameter(RequestFacade.java:381) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:84) [spring-web-5.1.8.RELEASE.jar:5.1.8.RELEASE]
    	... 23 common frames omitted
    Caused by: org.apache.tomcat.util.http.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (39356221) exceeds the configured maximum (31457280)
    	at org.apache.tomcat.util.http.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:808) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.tomcat.util.http.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:256) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.tomcat.util.http.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:280) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
    	at org.apache.catalina.connector.Request.parseParts(Request.java:2881) ~[tomcat-embed-core-9.0.21.jar:9.0.21]
    	... 27 common frames omitted

对比使用POSTMAN进行测试上传同一个文件，则能得到正确的全局异常定义的返回

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lpbmd6aWlzbWU_size_16_color_FFFFFF_t_70 4]

找到一个临时的解决方案

将配置文件的文件大小调高

server:
      port: 10001
    spring:
      application:
        name: spring-cloud-upload-swagger-demo
      servlet:
        multipart:
          max-file-size: 100MB
          max-request-size: 100MB

再添加手动的文件上传拦截器

@Component
    public class FileUploadInterceptor implements HandlerInterceptor {
        private final long MAX_FILE_SIZE = 30 * 1024 * 1024;
    
        @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
            if (null != request && ServletFileUpload.isMultipartContent(request)) {
                long requestSize = new ServletRequestContext(request).contentLength();
                if (requestSize > MAX_FILE_SIZE) {
                    throw new MaxUploadSizeExceededException(MAX_FILE_SIZE);
                }
            }
            return true;
        }
    }

将文件上传拦截器加入

@Component
    public class InterceptorConfig implements WebMvcConfigurer {
    
        @Autowired
        private FileUploadInterceptor fileUploadInterceptor;
    
        @Override
        public void addInterceptors(InterceptorRegistry registry){
            registry.addInterceptor(fileUploadInterceptor);
        }
    }

重启项目，测试上传

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lpbmd6aWlzbWU_size_16_color_FFFFFF_t_70 5]

临时方案二，发现导致连接重置的配置是max-request-size

修改配置文件，去掉拦截器

max-request-size可以设置的比较大，-1测试的情况来看也不是大小无限制

server:
      port: 10001
    spring:
      application:
        name: spring-cloud-upload-swagger-demo
      servlet:
        multipart:
          max-file-size: 30MB
          max-request-size: -1

尝试切换了Jetty和Undertow两个不同的servlet容器也是会有问题

[GITHUB源码参考][GITHUB]

欢迎关注微信交流  
![在这里插入图片描述][70]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lpbmd6aWlzbWU_size_16_color_FFFFFF_t_70]: /images/20211116/956c80929e874424bd5862d552b8daf2.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lpbmd6aWlzbWU_size_16_color_FFFFFF_t_70 1]: /images/20211116/8740ac0c9c2045028741ece10390fed4.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lpbmd6aWlzbWU_size_16_color_FFFFFF_t_70 2]: /images/20211116/6c8708990b87438ab51393ecdab7fb98.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lpbmd6aWlzbWU_size_16_color_FFFFFF_t_70 3]: /images/20211116/99425d73c1c14a31a230b8ea7288ecf9.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lpbmd6aWlzbWU_size_16_color_FFFFFF_t_70 4]: /images/20211116/43726397d4934506a34ff70b88d0a5b3.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3lpbmd6aWlzbWU_size_16_color_FFFFFF_t_70 5]: /images/20211116/62a766c076974e5e81148ff6cc712994.png
[GITHUB]: https://github.com/yingziisme/spring-boot-swagger-upload-demo
[70]: /images/20211116/ab6fa576760a4631a921897bc1219ae4.png