SpringCloud（二十一）feign注意事项

在用feign做get请求时，如果方法里面是一个对象，如下所示，虽然标识的时get请求，但是feign在实际请求时，依旧用的post请求。

    @GetMapping(value = "getUser")
    public Map getUser(Map<String,Object> user);

我把被请求的接口，改成只接受get请求

    @RequestMapping(value = "getUser",method = RequestMethod.GET)
    public User getUser(User user){
        logger.info("请求了getUser");
        return user;
    }

feign在请求时报错如下

{"timestamp":"2018-09-17T14:15:08.788+0000","status":405,"error":"Method Not Allowed","message":"Request method 'POST' not supported","path":"/hello/getUser"}] with root cause

feign.FeignException: status 405 reading HelloFeign#getUser(Map); content:
{"timestamp":"2018-09-17T14:15:08.788+0000","status":405,"error":"Method Not Allowed","message":"Request method 'POST' not supported","path":"/hello/getUser"}
	at feign.FeignException.errorStatus(FeignException.java:62) ~[feign-core-9.5.1.jar:na]
	at feign.codec.ErrorDecoder$Default.decode(ErrorDecoder.java:91) ~[feign-core-9.5.1.jar:na]
	at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:138) ~[feign-core-9.5.1.jar:na]
	at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:76) ~[feign-core-9.5.1.jar:na]
	at feign.ReflectiveFeign$FeignInvocationHandler.invoke(ReflectiveFeign.java:103) ~[feign-core-9.5.1.jar:na]
	at com.sun.proxy.$Proxy83.getUser(Unknown Source) ~[na:na]
	at com.xhx.springcloud.controller.RibbionController.getUser(RibbionController.java:33) ~[classes/:na]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_171]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_171]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_171]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_171]
	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209) ~[spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE]
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136) ~[spring-web-5.0.5.RELEASE.jar:5.0.5.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102) ~[spring-webmvc-5.0.5.RELEASE.jar:5.0.5.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:877) ~[spring-webmvc-5.0.5.RELEASE.jar:5.0.5.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:783) ~[spring-webmvc-5.0.5.RELEASE.jar:5.0.5.RELEASE]
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.0.5.RELEASE.jar:5.0.5.RELEASE]
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991) ~[spring-webmvc-5.0.5.RELEASE.jar:5.0.5.RELEASE]
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925) ~[spring-webmvc-5.0.5.RELEASE.jar:5.0.5.RELEASE]
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974) ~[spring-webmvc-5.0.5.RELEASE.jar:5.0.5.RELEASE]
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:866) ~[spring-webmvc-5.0.5.RELEASE.jar:5.0.5.RELEASE]

要想用get请求，必须用下面的这种方式，把参数分开，不能用对象传，@RequestParam与value必须加上，不加上启动时会报错。如果传对象的话，测试了一下，@RequestBody可以不用加，能正常请求。

    @GetMapping(value = "getUser")
    public Map getUser(@RequestParam(value = "id") String id,@RequestParam(value = "name") String name);

应用的springboot与springcloud版本如下：

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.1.RELEASE</version>
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <spring-cloud.version>Finchley.SR1</spring-cloud.version>
    </properties>

SpringCloud（二十一）feign注意事项

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