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SpringCloud+Feign环境下文件上传与form-data同时存在的解决办法

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互联网集市收集整理的这篇技术教程文章主要介绍了SpringCloud+Feign环境下文件上传与form-data同时存在的解决办法，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含26622字，纯文字阅读大概需要39分钟。

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SpringCloud+Feign环境下文件上传与form-data同时存在的解决办法

最近项目转型使用SpringCloud框架下的微服务架构，各微服务之间使用Feign进行调用。期间，发现若被调用方法涉及到文件上传且仅存在单个文件时，一切正常，代码片段如下：

            1     @RequestMapping(value = "/if/****/add", method = RequestMethod.POST,consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
2     JSONObject add(@RequestPart(value = "file") MultipartFile file);

但若同时需要传递其他form-data数据时，则一直报错。

            1     @RequestMapping(value = "/if/****", method = RequestMethod.POST, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
2     Object add(@RequestParam(name = "objectCode") String objectCode, @RequestPart(name = "file") MultipartFile file);

报错信息为：

             1 org.springframework.web.multipart.support.MissingServletRequestPartException: Required request part ‘file‘ is not present
 2     at org.springframework.web.method.annotation.RequestParamMethodArgumentResolver.handleMissingValue(RequestParamMethodArgumentResolver.java:193)
 3     at org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver.resolveArgument(AbstractNamedValueMethodArgumentResolver.java:109)
 4     at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:121)
 5     at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:158)
 6     at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:128)
 7     at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97)
 8     at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
 9     at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
10     at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
11     at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)
12     at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
13     at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
14     at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)
15     at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
16     at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
17     at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
18     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
19     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
20     at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
21     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
22     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
23     at org.springframework.boot.web.filter.ApplicationContextHeaderFilter.doFilterInternal(ApplicationContextHeaderFilter.java:55)
24     at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
25     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
26     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)

此时，feign日志为：

             1 2018-12-22 03:42:37.591 DEBUG 66057 --- [io-31023-exec-2] c.e.l.c.m.t.f.TestFileFeignController    : [TestFileFeignController#t1] ---> POST http://assembly-uiif/if/test1/public/t1?objectCode=test%3ASat+Dec+22+03%3A42%3A31+CST+2018 HTTP/1.1 2 2018-12-22 03:42:37.593 DEBUG 66057 --- [io-31023-exec-2] c.e.l.c.m.t.f.TestFileFeignController    : [TestFileFeignController#t1] Content-Type: multipart/form-data; charset=UTF-8; boundary=167d24a8200
 3 2018-12-22 03:42:37.594 DEBUG 66057 --- [io-31023-exec-2] c.e.l.c.m.t.f.TestFileFeignController    : [TestFileFeignController#t1] Content-Length: 161
 4 2018-12-22 03:42:37.595 DEBUG 66057 --- [io-31023-exec-2] c.e.l.c.m.t.f.TestFileFeignController    : [TestFileFeignController#t1] 
 5 2018-12-22 03:42:37.596 DEBUG 66057 --- [io-31023-exec-2] c.e.l.c.m.t.f.TestFileFeignController    : [TestFileFeignController#t1] Binary data
 6 2018-12-22 03:42:37.599 DEBUG 66057 --- [io-31023-exec-2] c.e.l.c.m.t.f.TestFileFeignController    : [TestFileFeignController#t1] ---> END HTTP (161-byte body)
 7 2018-12-22 03:42:37.618  INFO 66057 --- [io-31023-exec-2] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@65669249: startup date [Sat Dec 22 03:42:37 CST 2018]; parent: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@47df5041
 8 2018-12-22 03:42:37.777  INFO 66057 --- [io-31023-exec-2] f.a.AutowiredAnnotationBeanPostProcessor : JSR-330 ‘javax.inject.Inject‘ annotation found and supported for autowiring
 9 2018-12-22 03:42:38.615  INFO 66057 --- [io-31023-exec-2] c.netflix.config.ChainedDynamicProperty  : Flipping property: assembly-uiif.ribbon.ActiveConnectionsLimit to use NEXT property: niws.loadbalancer.availabilityFilteringRule.activeConnectionsLimit = 2147483647
10 2018-12-22 03:42:38.677  INFO 66057 --- [io-31023-exec-2] c.n.u.concurrent.ShutdownEnabledTimer    : Shutdown hook installed for: NFLoadBalancer-PingTimer-assembly-uiif
11 2018-12-22 03:42:38.786  INFO 66057 --- [io-31023-exec-2] c.netflix.loadbalancer.BaseLoadBalancer  : Client: assembly-uiif instantiated a LoadBalancer: DynamicServerListLoadBalancer:{NFLoadBalancer:name=assembly-uiif,current list of Servers=[],Load balancer stats=Zone stats: {},Server stats: []}ServerList:null12 2018-12-22 03:42:38.796  INFO 66057 --- [io-31023-exec-2] c.n.l.DynamicServerListLoadBalancer      : Using serverListUpdater PollingServerListUpdater
13 2018-12-22 03:42:38.860  INFO 66057 --- [io-31023-exec-2] c.netflix.config.ChainedDynamicProperty  : Flipping property: assembly-uiif.ribbon.ActiveConnectionsLimit to use NEXT property: niws.loadbalancer.availabilityFilteringRule.activeConnectionsLimit = 2147483647
14 2018-12-22 03:42:38.863  INFO 66057 --- [io-31023-exec-2] c.n.l.DynamicServerListLoadBalancer      : DynamicServerListLoadBalancer for client assembly-epsic-uiif initialized: DynamicServerListLoadBalancer:{NFLoadBalancer:name=assembly-uiif,current list of Servers=[192.168.43.31:20008],Load balancer stats=Zone stats: {defaultzone=[Zone:defaultzone;    Instance count:1;    Active connections count: 0;    Circuit breaker tripped count: 0;    Active connections per server: 0.0;]
15 },Server stats: [[Server:192.168.43.31:20008;    Zone:defaultZone;    Total Requests:0;    Successive connection failure:0;    Total blackout seconds:0;    Last connection made:Thu Jan 01 08:00:00 CST 1970;    First connection made: Thu Jan 01 08:00:00 CST 1970;    Active Connections:0;    total failure count in last (1000) msecs:0;    average resp time:0.0;    90 percentile resp time:0.0;    95 percentile resp time:0.0;    min resp time:0.0;    max resp time:0.0;    stddev resp time:0.0]
16]}ServerList:org.springframework.cloud.netflix.ribbon.eureka.DomainExtractingServerList@114d8fc3
17 2018-12-22 03:42:39.606 DEBUG 66057 --- [io-31023-exec-2] c.e.l.c.m.t.f.TestFileFeignController    : [TestFileFeignController#t1] <--- HTTP/1.1 200 (2006ms)
18 2018-12-22 03:42:39.607 DEBUG 66057 --- [io-31023-exec-2] c.e.l.c.m.t.f.TestFileFeignController    : [TestFileFeignController#t1] cache-control: no-cache, no-store, max-age=0, must-revalidate
19 2018-12-22 03:42:39.608 DEBUG 66057 --- [io-31023-exec-2] c.e.l.c.m.t.f.TestFileFeignController    : [TestFileFeignController#t1] content-type: application/json;charset=UTF-8
20 2018-12-22 03:42:39.608 DEBUG 66057 --- [io-31023-exec-2] c.e.l.c.m.t.f.TestFileFeignController    : [TestFileFeignController#t1] date: Fri, 21 Dec 2018 19:42:39 GMT
21 2018-12-22 03:42:39.609 DEBUG 66057 --- [io-31023-exec-2] c.e.l.c.m.t.f.TestFileFeignController    : [TestFileFeignController#t1] expires: 0
22 2018-12-22 03:42:39.610 DEBUG 66057 --- [io-31023-exec-2] c.e.l.c.m.t.f.TestFileFeignController    : [TestFileFeignController#t1] pragma: no-cache
23 2018-12-22 03:42:39.610 DEBUG 66057 --- [io-31023-exec-2] c.e.l.c.m.t.f.TestFileFeignController    : [TestFileFeignController#t1] transfer-encoding: chunked
24 2018-12-22 03:42:39.610 DEBUG 66057 --- [io-31023-exec-2] c.e.l.c.m.t.f.TestFileFeignController    : [TestFileFeignController#t1] x-application-context: assembly-uiif:develop:20008
25 2018-12-22 03:42:39.610 DEBUG 66057 --- [io-31023-exec-2] c.e.l.c.m.t.f.TestFileFeignController    : [TestFileFeignController#t1] x-content-type-options: nosniff
26 2018-12-22 03:42:39.613 DEBUG 66057 --- [io-31023-exec-2] c.e.l.c.m.t.f.TestFileFeignController    : [TestFileFeignController#t1] x-frame-options: SAMEORIGIN
27 2018-12-22 03:42:39.613 DEBUG 66057 --- [io-31023-exec-2] c.e.l.c.m.t.f.TestFileFeignController    : [TestFileFeignController#t1] x-xss-protection: 1; mode=block
28 2018-12-22 03:42:39.613 DEBUG 66057 --- [io-31023-exec-2] c.e.l.c.m.t.f.TestFileFeignController    : [TestFileFeignController#t1] 
29 2018-12-22 03:42:39.615 DEBUG 66057 --- [io-31023-exec-2] c.e.l.c.m.t.f.TestFileFeignController    : [TestFileFeignController#t1] {"head":{"orgId":0,"orgCode":"","vers":null,"reqId":null,"errorCode":1,"errorCodeI18n":"i18n.errorCode.1","errorMessage":"Required request part ‘file‘ is not present","errorStack":"org.springframework.web.multipart.support.MissingServletRequestPartException: Required request part ‘file‘ is not present\n\tat org.springframework.web.method.annotation.RequestParamMethodArgumentResolver.handleMissingValue(RequestParamMethodArgumentResolver.java:193)\n\tat org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver.resolveArgument(AbstractNamedValueMethodArgumentResolver.java:109)\n\tat org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:121)\n\tat org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:158)\n\tat org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:128)\n\tat org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97)\n\tat org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)\n\tat org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)\n\tat org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)\n\tat org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)\n\tat org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)\n\tat org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)\n\tat org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)\n\tat javax.servlet.http.HttpServlet.service(HttpServlet.java:661)\n\tat org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)\n\tat javax.servlet.http.HttpServlet.service(HttpServlet.java:742)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)\n\tat org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)\n\tat org.springframework.boot.web.filter.ApplicationContextHeaderFilter.doFilterInternal(ApplicationContextHeaderFilter.java:55)\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)\n\tat com.egoonet.devtools.springstarter.iam.sso.config.web.MyFilterSecurityInterceptor.invoke(MyFilterSecurityInterceptor.java:61)\n\tat com.egoonet.devtools.springstarter.iam.sso.config.web.MyFilterSecurityInterceptor.doFilter(MyFilterSecurityInterceptor.java:31)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)\n\tat org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:110)\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)\n\tat org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:317)\n\tat org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127)\n\tat org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91)\n\tat org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)\n\tat com.***.web.MyFilterSecurityInterceptor.invoke(MyFilterSecurityInterceptor.java:61)\n\tat com.***.web.MyFilterSecurityInterceptor.doFilter(MyFilterSecurityInterceptor.java:31)\n\tat org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)\n\tat org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114)\n\tat org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)\n\tat org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137)\n\tat org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)\n\tat org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)\n\tat org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)\n\tat org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:150)\n\tat org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)\n\tat org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:170)\n\tat org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)\n\tat org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)\n\tat org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)\n\tat org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:200)\n\tat org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)\n\tat org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116)\n\tat org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)\n\tat org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:64)\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)\n\tat org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)\n\tat org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)\n\tat org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)\n\tat org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56)\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)\n\tat org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)\n\tat org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:214)\n\tat org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177)\n\tat org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:347)\n\tat org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:263)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)\n\tat org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)\n\tat org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:108)\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)\n\tat org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)\n\tat org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)\n\tat org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:106)\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)\n\tat org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:96)\n\tat org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)\n\tat org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)\n\tat org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)\n\tat org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)\n\tat org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)\n\tat org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)\n\tat org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)\n\tat org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)\n\tat org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)\n\tat org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)\n\tat org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)\n\tat org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)\n\tat org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)\n\tat org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)\n\tat org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)\n\tat java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)\n\tat java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)\n\tat org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)\n\tat java.lang.Thread.run(Thread.java:748)\n","userId":0,"appId":108},"info":{"now":"Sat Dec 22 03:42:39 CST 2018"}}
30 2018-12-22 03:42:39.615 DEBUG 66057 --- [io-31023-exec-2] c.e.l.c.m.t.f.TestFileFeignController    : [TestFileFeignController#t1] <--- END HTTP (12082-byte body)

很显然，feign发送的报文不对，正常的报文应该是：

             1 POST /if/test1/public/t1 HTTP/1.1
 2 Host: localhost:20008
 3 cache-control: no-cache
 4 Postman-Token: 1c879cba-fdf3-4b9a-b1ef-e3d5af7be37e
 5 Content-Type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW
 6 7 Content-Disposition: form-data; name="objectCode"
 8 9abcd
1011 Content-Disposition: form-data; name="file"; filename="/Users/***/Downloads/03.jpg
121314 ------WebKitFormBoundary7MA4YWxkTrZu0gW--

ok，到此可知，问题出在feign发送报文时发送错误。

查阅feign源码，参考网络资料，实现一个自定义注解：

             1
            /**
             2
             * Feign代理方法上，与 RequestPart 一起组成多参数模式的注解

             3
            */
             4
            @Target(ElementType.PARAMETER)

             5
            @Retention(RetentionPolicy.RUNTIME)

             6
            @Documented

             7
            public @interface RequestPartParam {
 8 9     String name() default "";
1011boolean required() defaulttrue;
1213 }

实现自定义注解处理器：

             1
            import
             feign.MethodMetadata;

             2
            import
             org.springframework.cloud.netflix.feign.AnnotatedParameterProcessor;

             3
             4
            import
             java.lang.annotation.Annotation;

             5
            import
             java.lang.reflect.Method;

             6
            import
             java.util.Map;

             7
             8
            import
            static
             feign.Util.checkState;

             9
            import
            static
             feign.Util.emptyToNull;

            10
            11
            /**
            12
             *

            13
            */
            14
            public
            class RequestPartParamParameterProcessor implements AnnotatedParameterProcessor {
1516privatestaticfinal Class<RequestPartParam> ANNOTATION = RequestPartParam.class;
1718    @Override
19public Class<? extends Annotation> getAnnotationType() {
20return ANNOTATION;
21    }
2223    @Override
24publicboolean processArgument(AnnotatedParameterContext context, Annotation annotation, Method method) {
25int parameterIndex = context.getParameterIndex();
26         Class<?> parameterType = method.getParameterTypes()[parameterIndex];
27         MethodMetadata data = context.getMethodMetadata();
2829if (Map.class.isAssignableFrom(parameterType)) {
30             checkState(data.queryMapIndex() == null, "Query map can only be present once.");
31            data.queryMapIndex(parameterIndex);
3233returntrue;
34        }
3536         RequestPartParam requestPartParam = ANNOTATION.cast(annotation);
37         String name = requestPartParam.name();
38         checkState(emptyToNull(name) != null,
39                 "RequestPartParam.name() was empty on parameter %s",
40                parameterIndex);
41        context.setParameterName(name);
4243        data.formParams().add(name);
4445returntrue;
46    }
4748 }

实现自定义的编码器：

             1
            import
             feign.RequestTemplate;

             2
            import
             feign.codec.EncodeException;

             3
            import
             feign.codec.Encoder;

             4
            import
             feign.form.FormEncoder;

             5
            import
             feign.form.MultipartFormContentProcessor;

             6
            import
             feign.form.spring.SpringManyMultipartFilesWriter;

             7
            import
             feign.form.spring.SpringSingleMultipartFileWriter;

             8
            import
             lombok.val;

             9
            import
             org.springframework.web.multipart.MultipartFile;

            10
            11
            import
             java.lang.reflect.ParameterizedType;

            12
            import
             java.lang.reflect.Type;

            13
            import
             java.util.HashSet;

            14
            import
             java.util.Map;

            15
            import
             java.util.Set;

            16
            17
            import
            static
             feign.form.ContentType.MULTIPART;

            18
            import
            static
             java.util.Collections.singletonMap;

            19
            20
            /**
            21
             *

            22
            */
            23
            public
            class FeignSpringFormEncoder extends FormEncoder {
2425public FeignSpringFormEncoder () {
26this(new Encoder.Default());
27    }
2829public FeignSpringFormEncoder (Encoder delegate) {
30super(delegate);
3132         val processor = (MultipartFormContentProcessor) getContentProcessor(MULTIPART);
33         processor.addWriter(new SpringSingleMultipartFileWriter());
34         processor.addWriter(new SpringManyMultipartFilesWriter());
35    }
3637    @Override
38publicvoid encode (Object object, Type bodyType, RequestTemplate template) throws EncodeException {
39if ((bodyType instanceof ParameterizedType) && ((ParameterizedType) bodyType).getRawType().equals(Map.class)) {
40             val data = (Map<String, Object>) object;
41             Set<String> nullSet = new HashSet<>();
42for (Map.Entry<String, Object> entry : data.entrySet()) {
43if (entry.getValue() == null) {
44                    nullSet.add(entry.getKey());
45                }
46            }
47for (String s : nullSet) {
48                data.remove(s);
49            }
50super.encode(data, MAP_STRING_WILDCARD, template);
51return;
52         } elseif (bodyType.equals(MultipartFile.class)) {
53             val file = (MultipartFile) object;
54             val data = singletonMap(file.getName(), object);
55super.encode(data, MAP_STRING_WILDCARD, template);
56return;
57         } elseif (bodyType.equals(MultipartFile[].class)) {
58             val file = (MultipartFile[]) object;
59if (file != null) {
60                 val data = singletonMap(file.length == 0 ? "" : file[0].getName(), object);
61super.encode(data, MAP_STRING_WILDCARD, template);
62return;
63            }
64        }
65super.encode(object, bodyType, template);
66    }
6768 }

定义bean：

             1
                @Bean

             2
            public
             RequestPartParamParameterProcessor requestPartParamParameterProcessor() {

             3
            return
            new
             RequestPartParamParameterProcessor();

             4
                }

             5
             6
                @Bean

             7
            public
             PathVariableParameterProcessor pathVariableParameterProcessor() {

             8
            return
            new
             PathVariableParameterProcessor();

             9
                }

            10
            11
                @Bean

            12
            public
             RequestParamParameterProcessor requestParamParameterProcessor() {

            13
            return
            new
             RequestParamParameterProcessor();

            14
                }

            15
            16
                @Bean

            17
            public
             RequestHeaderParameterProcessor requestHeaderParameterProcessor() {

            18
            return
            new
             RequestHeaderParameterProcessor();

            19     }

注意，参阅 org.springframework.cloud.netflix.feign.support.SpringMvcContract 中的代码可知，使用自定义注解处理器时，必须自行处理另外3个系统默认注解处理器。

至此，重新编译，运行，工作正常。问题解决。

原文：https://www.cnblogs.com/oilamp/p/10159741.html

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