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：
@RequestMapping(value = "/if/****/add", method = RequestMethod.POST,consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
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。
@RequestMapping(value = "/if/****", method = RequestMethod.POST, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
Object add(@RequestParam(name = "objectCode") String objectCode, @RequestPart(name = "file") MultipartFile file);
报错信息为：
org.springframework.web.multipart.support.MissingServletRequestPartException: Required request part 'file' is not present
at org.springframework.web.method.annotation.RequestParamMethodArgumentResolver.handleMissingValue(RequestParamMethodArgumentResolver.java:193)
at org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver.resolveArgument(AbstractNamedValueMethodArgumentResolver.java:109)
at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:121)
at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:158)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:128)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.boot.web.filter.ApplicationContextHeaderFilter.doFilterInternal(ApplicationContextHeaderFilter.java:55)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
此时，feign日志为：
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
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
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
2018-12-22 03:42:37.595 DEBUG 66057 --- [io-31023-exec-2] c.e.l.c.m.t.f.TestFileFeignController : [TestFileFeignController#t1]
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
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)
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
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
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
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
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
2018-12-22 03:42:38.796 INFO 66057 --- [io-31023-exec-2] c.n.l.DynamicServerListLoadBalancer : Using serverListUpdater PollingServerListUpdater
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
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;]
},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]
]}ServerList:org.springframework.cloud.netflix.ribbon.eureka.DomainExtractingServerList@114d8fc3
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)
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
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
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
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
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
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
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
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
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
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
2018-12-22 03:42:39.613 DEBUG 66057 --- [io-31023-exec-2] c.e.l.c.m.t.f.TestFileFeignController : [TestFileFeignController#t1]
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"}}
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：
POST /if/test1/public/t1 HTTP/1.1
Host: localhost:20008
cache-control: no-cache
Postman-Token: 1c879cba-fdf3-4b9a-b1ef-e3d5af7be37e
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW Content-Disposition: form-data; name="objectCode" abcd Content-Disposition: form-data; name="file"; filename="/Users/***/Downloads/03.jpg ------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：
/**
* Feign代理方法上，与 RequestPart 一起组成多参数模式的注解
*/
@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface RequestPartParam { String name() default ""; boolean required() default true; }
实现自定义注解处理器：
import feign.MethodMetadata;
import org.springframework.cloud.netflix.feign.AnnotatedParameterProcessor; import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.Map; import static feign.Util.checkState;
import static feign.Util.emptyToNull; /**
*
*/
public class RequestPartParamParameterProcessor implements AnnotatedParameterProcessor { private static final Class<RequestPartParam> ANNOTATION = RequestPartParam.class; @Override
public Class<? extends Annotation> getAnnotationType() {
return ANNOTATION;
} @Override
public boolean processArgument(AnnotatedParameterContext context, Annotation annotation, Method method) {
int parameterIndex = context.getParameterIndex();
Class<?> parameterType = method.getParameterTypes()[parameterIndex];
MethodMetadata data = context.getMethodMetadata(); if (Map.class.isAssignableFrom(parameterType)) {
checkState(data.queryMapIndex() == null, "Query map can only be present once.");
data.queryMapIndex(parameterIndex); return true;
} RequestPartParam requestPartParam = ANNOTATION.cast(annotation);
String name = requestPartParam.name();
checkState(emptyToNull(name) != null,
"RequestPartParam.name() was empty on parameter %s",
parameterIndex);
context.setParameterName(name); data.formParams().add(name); return true;
} }
实现自定义的编码器：
import feign.RequestTemplate;
import feign.codec.EncodeException;
import feign.codec.Encoder;
import feign.form.FormEncoder;
import feign.form.MultipartFormContentProcessor;
import feign.form.spring.SpringManyMultipartFilesWriter;
import feign.form.spring.SpringSingleMultipartFileWriter;
import lombok.val;
import org.springframework.web.multipart.MultipartFile; import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.HashSet;
import java.util.Map;
import java.util.Set; import static feign.form.ContentType.MULTIPART;
import static java.util.Collections.singletonMap; /**
*
*/
public class FeignSpringFormEncoder extends FormEncoder { public FeignSpringFormEncoder () {
this(new Encoder.Default());
} public FeignSpringFormEncoder (Encoder delegate) {
super(delegate); val processor = (MultipartFormContentProcessor) getContentProcessor(MULTIPART);
processor.addWriter(new SpringSingleMultipartFileWriter());
processor.addWriter(new SpringManyMultipartFilesWriter());
} @Override
public void encode (Object object, Type bodyType, RequestTemplate template) throws EncodeException {
if ((bodyType instanceof ParameterizedType) && ((ParameterizedType) bodyType).getRawType().equals(Map.class)) {
val data = (Map<String, Object>) object;
Set<String> nullSet = new HashSet<>();
for (Map.Entry<String, Object> entry : data.entrySet()) {
if (entry.getValue() == null) {
nullSet.add(entry.getKey());
}
}
for (String s : nullSet) {
data.remove(s);
}
super.encode(data, MAP_STRING_WILDCARD, template);
return;
} else if (bodyType.equals(MultipartFile.class)) {
val file = (MultipartFile) object;
val data = singletonMap(file.getName(), object);
super.encode(data, MAP_STRING_WILDCARD, template);
return;
} else if (bodyType.equals(MultipartFile[].class)) {
val file = (MultipartFile[]) object;
if (file != null) {
val data = singletonMap(file.length == 0 ? "" : file[0].getName(), object);
super.encode(data, MAP_STRING_WILDCARD, template);
return;
}
}
super.encode(object, bodyType, template);
} }
定义bean：
@Bean
public RequestPartParamParameterProcessor requestPartParamParameterProcessor() {
return new RequestPartParamParameterProcessor();
} @Bean
public PathVariableParameterProcessor pathVariableParameterProcessor() {
return new PathVariableParameterProcessor();
} @Bean
public RequestParamParameterProcessor requestParamParameterProcessor() {
return new RequestParamParameterProcessor();
} @Bean
public RequestHeaderParameterProcessor requestHeaderParameterProcessor() {
return new RequestHeaderParameterProcessor();
}
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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