1.请求第三方接口，用feign请求

请求第三方接口，用feign请求，header不通，feign的写法不同

调用时报错Could not write request: no suitable HttpMessageConverter found for request type [com.ccreate.cnpc.mall.dto.zm.ZMPageQueryDTO] and content type [multipart/form-data;charset=UTF-8]

1. 对方接口是multipart/form-data接收格式

package com.mall.controller.feign;import com.mall.controller.feign.fallback.ZMGoodFeignFallback;
import com.mall.dto.zm.ZMPageQueryDTO;
import com.mall.dto.zm.ZMSpuInfoDTO;
import com.ccreate.common.response.R;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;/*** 商品*/
@FeignClient(url = "${zm.host}", name = "cnpc-ZMGood", fallbackFactory = ZMGoodFeignFallback.class)
public interface ZMGoodFeign {/*** 商品列表查询**/@PostMapping(value = "/api/agent/goodsList", produces = {MediaType.APPLICATION_JSON_UTF8_VALUE}, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)R<ZMSpuInfoDTO> getSpuList(@RequestBody ZMPageQueryDTO page);}

对方返回的格式

  {code:200,message:"ok",data:{list:[{id:"10001661",name:"migo保温壶家用保温水壶大容量热水瓶304不锈钢热水壶保温瓶暖",sellingPoint:"304不锈钢 坚韧把手 24小时长效保温",skuType:"2",brandId:"100094",brandName:"miGo",categoryId:"100278",categoryIds:"100235,100273,100278",coverImage:"http://zmzx-b2b.oss-cn-hangzhou.aliyuncs.com/goods/2020052717090891958.jpg",marketPrice:"189.00",photos:["http://zmzx-b2b.oss-cn-hangzhou.aliyuncs.com/goods/2020052717090891958.jpg","http://zmzx-b2b.oss-cn-hangzhou.aliyuncs.com/goods/2020052717091363771.jpg",],detailImages:["http://zmzx-b2b.oss-cn-hangzhou.aliyuncs.com/goods/2020052717110984525.jpg","http://zmzx-b2b.oss-cn-hangzhou.aliyuncs.com/goods/2020052717111337957.jpg",],detailContent:"",deliverTime:"TIME24",servicePromise:["FREE_DELIVERY","PROMISE10"],afterSaleRule:"",auditStatus : "1",agentRejectReason : "",skuList:[{"skuId":"80005071","code":"S20003VH.02","marketPrice":"199.00","agentPrice":"200.00""weight":"0.90","specList":[{"name":"容量","value":"2L","image":"http://zmzx-b2b.oss-cn-hangzhou.aliyuncs.com/goods/2020052717160413832.jpg"},{"name":"颜色","value":"馥芮白","image":""}],},{"skuId":"80005072","code":"S20003VH.01","marketPrice":"199.00","agentPrice":"200.00""weight":"0.90","specList":[{"name":"容量","value":"2L","image":"http://zmzx-b2b.oss-cn-hangzhou.aliyuncs.com/goods/2020052717161011241.jpg"},{"name":"颜色","value":"新草绿","image":""}],},{"skuId":"80005073","code":"S1506VH.02","marketPrice":"189.00","weight":"0.80","agentPrice":"200.00""specList":[{"name":"容量","value":"1.5L","image":"http://zmzx-b2b.oss-cn-hangzhou.aliyuncs.com/goods/2020052717162165903.jpg"},{"name":"颜色","value":"馥芮白","image":""}],},{"skuId":"80005074","code":"S1506VH.01","weight":"0.80","marketPrice":"189.00","agentPrice":"200.00""specList":[{"name":"容量","value":"1.5L","image":"http://zmzx-b2b.oss-cn-hangzhou.aliyuncs.com/goods/2020052717162532347.jpg"},{"name":"颜色","value":"新草绿","image":""}],}],status:"1",agentStatus:"1",agentRejectReason:""},],"total":1}
}

我们接收R对象

public class R<T> implements Serializable {private static final int SUCCESS = 200;private static final String SUCCESS_MESSAGE = "success";private static final long serialVersionUID = 1L;private int code = 200;private String message = "success";private T data;
}

2. 对方接收格式是x-www-form-urlencoded

我们对应的feign请求是

package com.mall.controller.feign;import com.mall.controller.feign.fallback.ThirdPriceFeignFallback;
import com.mall.dto.GoodSkuThirdPriceAddDTO;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.util.MultiValueMap;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;/*** 三方商品价格*/
@FeignClient(url = "${li.host}", name = "cnpc-price", fallbackFactory = ThirdPriceFeignFallback.class)
public interface ThirdPriceFeign {//    @PostMapping(value = "/price", produces = {MediaType.APPLICATION_JSON_UTF8_VALUE}, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)@PostMapping(value = "/price",headers = {"content-type=application/x-www-form-urlencoded"})GoodSkuThirdPriceAddDTO getThirdPrice(@RequestBody MultiValueMap<String, Object> request);}

这里参数必须是MultiValueMap，否则转换参数的时候就会报错

3. 断点调试

所有的参数封装都会走到org.springframework.cloud.openfeign.support.SpringEncoder#encode这个方法

如上图所示，最终会由 

public class AllEncompassingFormHttpMessageConverter extends FormHttpMessageConverter 这个类解析参数

最终组装好header和body参数，再去请求

4. 以后还有请求对方接口header带token或其他header信息的，再总结。