Spring Boot Feign Client Method 参数过多

Posted 2023-02-26

【中文标题】Spring Boot Feign Client Method 参数过多

【英文标题】：SpringBoot FeignClient Method has too many paramters

【发布时间】：2017-09-22 02:49:11

【问题描述】：

我使用 spring-cloud 的 feignClient，当我的界面中有多个 Beans 参数时出现问题，错误显示如下：

Caused by: java.lang.IllegalStateException: Method has too many Body parameters: public abstract com.wxl.pros.test.web.common.CommonResObject com.wxl.pros.test.web.feign.OrderFeignClient.createOrder(com.wxl.pros.test.services.form.order.CreateOrderForm,com.wxl.pros.test.services.vo.User)
    at feign.Util.checkState(Util.java:128)
    at feign.Contract$BaseContract.parseAndValidateMetadata(Contract.java:114)
    at org.springframework.cloud.netflix.feign.support.SpringMvcContract.parseAndValidateMetadata(SpringMvcContract.java:133)
    at feign.Contract$BaseContract.parseAndValidatateMetadata(Contract.java:64)
    at feign.hystrix.HystrixDelegatingContract.parseAndValidatateMetadata(HystrixDelegatingContract.java:34)
    at feign.ReflectiveFeign$ParseHandlersByName.apply(ReflectiveFeign.java:146)
    at feign.ReflectiveFeign.newInstance(ReflectiveFeign.java:53)
    at feign.Feign$Builder.target(Feign.java:209)
    at org.springframework.cloud.netflix.feign.HystrixTargeter.target(HystrixTargeter.java:48)
    at org.springframework.cloud.netflix.feign.FeignClientFactoryBean.getObject(FeignClientFactoryBean.java:184)
    at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:168)
    ... 27 common frames omitted

这是我的接口方法之一：

@RequestMapping(value="/order/createOrder",method=RequestMethod.POST)
    public CommonResObject createOrder(@RequestBody OrderForm orderForm,@RequestBody User user);

【问题讨论】：

一个请求只有一个主体。应该如何映射到 2 个不同的参数...

我的错，我也找到了，谢谢，现在我满足了调用这个方法时需要两个对象的需求，我怎样才能通过接收两个或多个对象参数来实现呢？

将它们包裹在另一个对象中...

【参考方案1】：

@RequestBody 只能存在一个。如果有多个对象需要转移，可以使用json合并多个对象。

【参考方案2】：

您可以将它们放在第三个 pojo 中：

public class Order 
     OrderForm orderForm;
     User user;
     public Order(@JsonProperty("orderForm") orderForm, @JsonProperty("user") User user) 
         this.orderForm = orderForm;
         this.user = user;
     

然后你的 API 就变成这样了：

@RequestMapping(value="/order/createOrder",method=RequestMethod.POST)
public CommonResObject createOrder(@RequestBody Order order);

【参考方案3】：

如果您有多个参数，一个请求正文和多个参数。使用精确的注释指定参数类型：

ResponseMessage<String> getCustomInformation((@RequestBody CustomRequest request, @RequestParam("language") String language,
            @RequestParam("channel") String channel, @RequestParam("requestId") String requestId