Spring boot 使用 openfeign 客户端上传图片步骤，Feign进行跨服务传递图片

场景：

上传图片的服务为A，然后B服务通过feign客户端调用A服务并传递 MultipartFile

步骤1：加入依赖

        
		
			io.github.openfeign.form
			feign-form
			3.8.0
		
		
			io.github.openfeign.form
			feign-form-spring
			3.8.0
		

步骤2：添加配置 FeignConfiguration

@Configuration
public class FeignConfiguration implements RequestInterceptor {
    @Bean
    Logger.Level feignLoggerLevel() {
        return Logger.Level.FULL;
    }

    @Autowired
    private ObjectFactory messageConverters;
    // new一个form编码器，实现支持form表单提交

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

步骤3：Feign客户端调整

@PostMapping(value = "/fileupload",produces = {MediaType.APPLICATION_JSON_UTF8_VALUE},consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    String fileUpload(@RequestPart(value = "file") MultipartFile file, @RequestParam String path);

注意：不能使用 @RequestParam (value = "file") ，使用 @RequestPart(value = "file")

常见的异常

feign.codec.EncodeException: Could not write request: no suitable HttpMessageConverter found for request type

Could not parse multipart servlet request; nested exception is java.io.IOException: org.apache.tomcat.util.http.fileupload.FileUploadException: the request was rejected because no multipart boundary was found