SpringCloud系列之@SpringQueryMap传Bean对象数据-CFANZ编程社区

环境准备：

JDK 1.8
SpringBoot2.2.3
SpringCloud(Hoxton.SR7)
Maven 3.2+
开发工具

IntelliJ IDEA
smartGit

maven加上openFeign配置

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>

在使用Spring Cloud集成的openFeign GET请求调用一些接口，有时候会遇到需要传比较多的参数，所以，我们可以定义一个Bean类，直接丢过去？

@FeignClient(value = "EUREKA-SERVICE-PROVIDER" ,contextId = "EUREKA-SERVICE-PROVIDER")
@Service
public interface UserService {
    @GetMapping(value = "/api/users")
    List<User> list(User user);
}

调用一些服务接口，会出现报错，如图

feign.FeignException$MethodNotAllowed: [405] during [GET] to [http://127.0.0.1:8083/api/users] [UserService#list(User)]: [{"timestamp":"2022-10-11T00:15:10.514+00:00","status":405,"error":"Method Not Allowed","message":"","path":"/api/users"}]
  at feign.FeignException.clientErrorStatus(FeignException.java:203)
  at feign.FeignException.errorStatus(FeignException.java:177)
  at feign.FeignException.errorStatus(FeignException.java:169)
  at feign.codec.ErrorDecoder$Default.decode(ErrorDecoder.java:92)
  at feign.AsyncResponseHandler.handleResponse(AsyncResponseHandler.java:96)
  at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:138)
  at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:89)
  at feign.ReflectiveFeign$FeignInvocationHandler.invoke(ReflectiveFeign.java:100)
  at com.sun.proxy.$Proxy76.list(Unknown Source)
  at com.example.springcloud.feign.SpringcloudFeignApplication.list(SpringcloudFeignApplication.java:36)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:498)

所以，我们有什么方法？在spring-cloud-openfeign-core:2.1.0.RELEASE之前版本是不可以支持Bean类直接丢的，所以，只能使用@RequestParam传参数，在spring-cloud-openfeign-core:2.1.0.RELEASE以及之后版本，可以使用提供的@SpringQueryMap注解传一个bean对象过去

@FeignClient(value = "EUREKA-SERVICE-PROVIDER" ,contextId = "EUREKA-SERVICE-PROVIDER" )
@Service
public interface UserService {
 
    @GetMapping(value = "/api/users")
    List<User> list(@SpringQueryMap User user);

}