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:null
  12.  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.  
  9.  abcd
  10.  
  11.  Content-Disposition: form-data; name="file"; filename="/Users/***/Downloads/03.jpg
  12.  
  13.  ------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 "";
  10.  
  11.      boolean required() default true;
  12.  
  13.  }

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 {
  15.  
  16.      private static final Class<RequestPartParam> ANNOTATION = RequestPartParam.class;
  17.  
  18.      @Override
  19.      public Class<? extends Annotation> getAnnotationType() {
  20.          return ANNOTATION;
  21.      }
  22.  
  23.      @Override
  24.      public boolean processArgument(AnnotatedParameterContext context, Annotation annotation, Method method) {
  25.          int parameterIndex = context.getParameterIndex();
  26.          Class<?> parameterType = method.getParameterTypes()[parameterIndex];
  27.          MethodMetadata data = context.getMethodMetadata();
  28.  
  29.          if (Map.class.isAssignableFrom(parameterType)) {
  30.              checkState(data.queryMapIndex() == null, "Query map can only be present once.");
  31.              data.queryMapIndex(parameterIndex);
  32.  
  33.              return true;
  34.          }
  35.  
  36.          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);
  42.  
  43.          data.formParams().add(name);
  44.  
  45.          return true;
  46.      }
  47.  
  48.  }

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 {
  24.  
  25.      public FeignSpringFormEncoder () {
  26.          this(new Encoder.Default());
  27.      }
  28.  
  29.      public FeignSpringFormEncoder (Encoder delegate) {
  30.          super(delegate);
  31.  
  32.          val processor = (MultipartFormContentProcessor) getContentProcessor(MULTIPART);
  33.          processor.addWriter(new SpringSingleMultipartFileWriter());
  34.          processor.addWriter(new SpringManyMultipartFilesWriter());
  35.      }
  36.  
  37.      @Override
  38.      public void encode (Object object, Type bodyType, RequestTemplate template) throws EncodeException {
  39.          if ((bodyType instanceof ParameterizedType) && ((ParameterizedType) bodyType).getRawType().equals(Map.class)) {
  40.              val data = (Map<String, Object>) object;
  41.              Set<String> nullSet = new HashSet<>();
  42.              for (Map.Entry<String, Object> entry : data.entrySet()) {
  43.                  if (entry.getValue() == null) {
  44.                      nullSet.add(entry.getKey());
  45.                  }
  46.              }
  47.              for (String s : nullSet) {
  48.                  data.remove(s);
  49.              }
  50.              super.encode(data, MAP_STRING_WILDCARD, template);
  51.              return;
  52.          } else if (bodyType.equals(MultipartFile.class)) {
  53.              val file = (MultipartFile) object;
  54.              val data = singletonMap(file.getName(), object);
  55.              super.encode(data, MAP_STRING_WILDCARD, template);
  56.              return;
  57.          } else if (bodyType.equals(MultipartFile[].class)) {
  58.              val file = (MultipartFile[]) object;
  59.              if (file != null) {
  60.                  val data = singletonMap(file.length == 0 ? "" : file[0].getName(), object);
  61.                  super.encode(data, MAP_STRING_WILDCARD, template);
  62.                  return;
  63.              }
  64.          }
  65.          super.encode(object, bodyType, template);
  66.      }
  67.  
  68.  }

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。

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