springboot 通过@FeignClient 调用远程接口上传文件

在解决这个问题的时候，踩过好多坑；这里只写最终成功的方案，这种方案也是一本万利的写法，不会影响其他的feign接口的调用，最后希望对大家有所帮助

1、首先创建一个配置类

package com.meritdata.dam.common.uploadfile;

import feign.codec.Encoder;
import feign.form.spring.SpringFormEncoder;
import org.springframework.beans.factory.ObjectFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.cloud.openfeign.support.SpringEncoder;
import org.springframework.context.annotation.Bean;

public class FeignMultipartSupport {
    
    
    @Autowired
    private ObjectFactory<HttpMessageConverters> messageConverters;

    @Bean
    public Encoder feignFormEncoder() {
    
    
        return new SpringFormEncoder(new SpringEncoder(messageConverters));
    }

}

注意：这个配置类，不需要加@Configuration

2、将上面的配置类，配置到@FeignClient注解中

@Service(value = "damDataWarehouseClient")
@FeignClient(value = "dam-datawarehouse", path = "/api/datamanage", configuration = FeignMultipartSupportConfig.class)
public interface DamDataWarehouseClient {
    
    
	    /**
     * 导入资源信息
     *
     * @param file file
     */
    @RequestMapping(value = "/resourcecatalog/manage/loadData", method = RequestMethod.POST, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    @ResponseBody
    ResultBody loadData(@RequestPart("formFile") MultipartFile file) throws Exception;
    }

3、需要在调用的接口中加consumes = MediaType.MULTIPART_FORM_DATA_VALUE