feign远程调用无法传递对象属性405

- 日理万妓 2023-01-17 10:46 39阅读 0赞

**feign远程调用无法传递对象属性**

## 1、get请求405错误 ##

**通过查看feign底层源码，feign底层使用的是`httpurlconnection`的工具，而进行传递body的时候，会调用`getOutputStrean`方法，里边会判断是否是get请求，如果是get请求，则`自动转为post`请求，而远方的服务只能够支持`get`请求，因此会报错**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5ODk4MTkx_size_16_color_FFFFFF_t_70]

## 2、使用feign请求远端，`configuration`添加如下配置类 ##

package com.zx.consumer;
    
    import com.google.common.collect.Lists;
    import feign.Contract;
    import feign.MethodMetadata;
    import feign.RequestInterceptor;
    import feign.RequestTemplate;
    import org.springframework.cloud.openfeign.AnnotatedParameterProcessor;
    import org.springframework.cloud.openfeign.annotation.PathVariableParameterProcessor;
    import org.springframework.cloud.openfeign.annotation.RequestHeaderParameterProcessor;
    import org.springframework.cloud.openfeign.annotation.RequestParamParameterProcessor;
    import org.springframework.cloud.openfeign.support.SpringMvcContract;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.core.convert.ConversionService;
    import org.springframework.web.bind.annotation.RequestBody;
    import org.springframework.web.context.request.RequestContextHolder;
    import org.springframework.web.context.request.ServletRequestAttributes;
    
    import javax.annotation.Resource;
    import javax.servlet.http.HttpServletRequest;
    import java.lang.annotation.Annotation;
    import java.lang.reflect.Method;
    import java.util.Enumeration;
    import java.util.List;
    
    /**
     * @author: zhaoxu
     * @date: 2021/4/29 0:20
     */
    @Configuration
    public class FeignConfiguration implements RequestInterceptor, AnnotatedParameterProcessor { 
        @Override
        public void apply(RequestTemplate template) { 
            //开启线程共享
            RequestContextHolder.setRequestAttributes(RequestContextHolder.getRequestAttributes(), true);
            ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
            HttpServletRequest request = attributes.getRequest();
            // 对消息头进行配置
            Enumeration<String> headerNames = request.getHeaderNames();
            if (headerNames != null) { 
                while (headerNames.hasMoreElements()) { 
                    String name = headerNames.nextElement();
                    String values = request.getHeader(name);
                    template.header(name, values);
                }
            }
        }
    
        @Resource
        private ConversionService feignConversionService;
        private static final Class<RequestBody> ANNOTATION = RequestBody.class;
    
        @Override
        public Class<? extends Annotation> getAnnotationType() { 
            return ANNOTATION;
        }
    
        @Override
        public boolean processArgument(AnnotatedParameterContext context, Annotation annotation, Method method) { 
            int paramIndex = context.getParameterIndex();
            MethodMetadata metadata = context.getMethodMetadata();
            if (metadata.queryMapIndex() == null) { 
                metadata.queryMapIndex(paramIndex);
                metadata.queryMapEncoded(true);
            }
            if ("GET".equals(metadata.template().method())) { 
                return true;
            }
            return false;
        }
    
        @Bean
        public Contract feignContract() { 
            List<AnnotatedParameterProcessor> parameterProcessors = Lists.newArrayList();
            parameterProcessors.add(new PathVariableParameterProcessor());
            parameterProcessors.add(new RequestHeaderParameterProcessor());
            parameterProcessors.add(new RequestParamParameterProcessor());
            parameterProcessors.add(new FeignConfiguration());
            return new SpringMvcContract(parameterProcessors, feignConversionService);
        }
    }

## 3、客户端： ##

![在这里插入图片描述][2021042901331564.png]

## 4、服务端： ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5ODk4MTkx_size_16_color_FFFFFF_t_70 1]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5ODk4MTkx_size_16_color_FFFFFF_t_70]: /images/20221021/22e7c2685e37487d8b4bb3d74c47b628.png
[2021042901331564.png]: /images/20221021/e6617b22930f4e73975ea2c68b374251.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM5ODk4MTkx_size_16_color_FFFFFF_t_70 1]: /images/20221021/950ef1f5408849269c53b8b7e57c3390.png