Method has too many Body parameters openfeign

feign 调用问题，最新版本的feign和旧版本的稍微有一些不一样，具体如下（eureka 作为服务发现与注册）

依赖：

    compile('io.github.openfeign:feign-java8:9.6.0')

    compile('org.springframework.cloud:spring-cloud-openfeign-core')

    compile('org.springframework.cloud:spring-cloud-starter-openfeign')

feign client 接口，这里统一使用feign的@Param进行注解

import org.springframework.cloud.openfeign.FeignClient;

import feign.Headers;

import feign.Param;

import feign.RequestLine;

@FeignClient(value = "xxx-service")

public interface xxxServiceClient {

    @RequestLine("POST /xxx/save")

    String saveLog(@Param(value = "data") String data);

}

对应xxx-service的具体rest，这里使用spring的@RequestParam 等进行参数的接收

    @RequestMapping(value = "/xxx/save", method = { RequestMethod.POST })

    public String saveLog(@RequestParam(value = "data", required = false) String data) String status) {
　　　　　// TODO 
　　

        return "xxx";

    }

feign 基本请求格式

 ...

 @RequestLine("POST /servers")

 void post(@Param("serverId") String serverId, @Param("count") int count);

 ...

 @RequestLine("GET /servers/{serverId}?count={count}")

 void get(@Param("serverId") String serverId, @Param("count") int count);
 ...

对于post多参数问题，需要使用form的提交格式（某些字段是xml、json之类的参数），普通的提交，head里是

"Content-Type: application/json; charset=UTF-8", "Accept: application/json"

多参数需要使用

"Content-Type: application/x-www-form-urlencoded; charset=UTF-8", "Accept: application/json"

而第二种格式需要feign-form的支持

依赖：

    compile('io.github.openfeign.form:feign-form:3.3.0')

    compile('io.github.openfeign.form:feign-form-spring:3.3.0')

    compile('io.github.openfeign:feign-java8:9.6.0')

    compile('org.springframework.cloud:spring-cloud-openfeign-core')

    compile('org.springframework.cloud:spring-cloud-starter-openfeign')

feign：

import org.springframework.cloud.openfeign.FeignClient;

import feign.Headers;

import feign.Param;

import feign.RequestLine;

@FeignClient(value = "whale-service", configuration = EurekaConfiguration.class)

public interface xxxServiceClient {

    @Headers({ "Content-Type: application/x-www-form-urlencoded; charset=UTF-8", "Accept: application/json" })

    @RequestLine("POST /deviceActionLog/save")

    String saveLog(@Param(value = "data") String data);

}

import org.springframework.cloud.openfeign.FeignClient;

import feign.Headers;

import feign.Param;

import feign.RequestLine;

@FeignClient(value = "xxx-service", configuration = EurekaConfiguration.class)

public interface xxxClient {

    @Headers({ "Content-Type: application/json; charset=UTF-8", "Accept: application/json" })

    @RequestLine("GET /xxx/obj?id={id}")

    String getById(@Param(value = "id") String deviceId);

}

注：若实现xxxclient的接口，则feign首先调用远程服务，远程服务不可用时，降级调用本地实现类

EurekaConfiguration：

import java.util.ArrayList;

import java.util.List;

import org.springframework.beans.factory.ObjectFactory;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Qualifier;

import org.springframework.boot.autoconfigure.http.HttpMessageConverters;

import org.springframework.cloud.openfeign.support.SpringDecoder;

import org.springframework.cloud.openfeign.support.SpringEncoder;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import org.springframework.context.annotation.Primary;

import org.springframework.http.converter.HttpMessageConverter;

import feign.Contract;

import feign.auth.BasicAuthRequestInterceptor;

import feign.codec.Decoder;

import feign.codec.Encoder;

import feign.form.FormEncoder;

import feign.form.spring.converter.SpringManyMultipartFilesReader;

@Configuration

public class EurekaConfiguration {

    @Bean

    public BasicAuthRequestInterceptor basicAuthRequestInterceptor() {

        return new BasicAuthRequestInterceptor("admin", "admin");//eureka 获取注册服务使用的账号密码

    }

    // 使用Feign自己的注解，使用springmvc的注解就会报错

    @Bean

    public Contract feignContract() {

        return new feign.Contract.Default();

    }

    @Autowired

    private ObjectFactory<HttpMessageConverters> messageConverters;

    @Bean // spring使用的编码器

    @Primary

    Encoder feignEncoder() {

        // return new SpringEncoder(this.messageConverters);

        return new FormEncoder(new SpringEncoder(this.messageConverters));

    }

    @Bean // download使用的解码器

    @Qualifier("download")

    public Decoder feignDecoder() {

        final List<HttpMessageConverter<?>> springConverters = messageConverters.getObject().getConverters();

        final List<HttpMessageConverter<?>> decoderConverters = new ArrayList<HttpMessageConverter<?>>(

                springConverters.size() + 1);

        decoderConverters.addAll(springConverters);

        decoderConverters.add(new SpringManyMultipartFilesReader(4096));

        final HttpMessageConverters httpMessageConverters = new HttpMessageConverters(decoderConverters);

        return new SpringDecoder(new ObjectFactory<HttpMessageConverters>() {

            @Override

            public HttpMessageConverters getObject() {

                return httpMessageConverters;

            }

        });

    }

}

参考：

https://github.com/OpenFeign/feign

http://sparkgis.com/java/2018/02/feign-method-has-too-many-body-parameters-%E5%8E%9F-feign-method-has-too-many-body-parameters-xixingzhe/

https://yezhwi.github.io/springcloud/2017/12/07/%E5%AE%9E%E8%B7%B5bug%E6%80%BB%E7%BB%93-Feign/

https://blog.csdn.net/liuchuanhong1/article/details/54728681

编码参考：

https://github.com/OpenFeign/feign-form

巴特西

Method has too many Body parameters openfeign

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