Feign传递MultipartFile问题

谁践踏了优雅 2024-03-17 00:18 36阅读 0赞

## 项目场景： ##

服务B 要通过 Feign 上传文件到服务A

### 问题描述： ###

这里使用FeignClient通过MultipartFile来上传文件，报了以下错误：

class XXX is not a type supported by this encoder.

原因分析：

OpenFeign 默认不支持文件参数 MultipartFile 。

## 解决方案： ##

### 1.服务端MultipartFile这个类型的参数要用@RequestPart(“file”) 这个注解 ###

@PostMapping("/uploadMultipleFile")
        public Result uploadImg(@RequestPart("file") MultipartFile[] files){
            try {
                return uploadService.uploadImg(files);
            }catch (Exception e){
                log.info("文件上传异常"+ ExceptionUtils.getStackTrace(e));
                return new Result(ResultCode.FAIL,"文件上传异常");
            }
        }

### 2.调用端加入如下坐标 ###

<dependency>
                <groupId>io.github.openfeign.form</groupId>
                <artifactId>feign-form</artifactId>
                <version>3.8.0</version>
            </dependency>
            
            <dependency>
                <groupId>io.github.openfeign.form</groupId>
                <artifactId>feign-form-spring</artifactId>
                <version>3.8.0</version>
            </dependency>
    
      
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-openfeign</artifactId>
            </dependency>

### 3.加入配置类 ###

import feign.codec.Encoder;
    import feign.form.spring.SpringFormEncoder;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.context.annotation.Primary;
    import org.springframework.context.annotation.Scope;
    
    
    @Configuration
    public class MultipartSupportConfig {
    
        @Bean
        @Primary
        @Scope("prototype")
        public Encoder multipartFormEncoder() {
            return new SpringFormEncoder();
        }
    
        @Bean
        public feign.Logger.Level multipartLoggerLevel() {
            return feign.Logger.Level.FULL;
        }
    
    }

### 4.调用端feign接口 ###

import com.qianxian.common.util.Result;
    import com.qianxian.user.config.MultipartSupportConfig;
    import org.springframework.cloud.openfeign.FeignClient;
    import org.springframework.http.MediaType;
    import org.springframework.web.bind.annotation.*;
    import org.springframework.web.multipart.MultipartFile;
    
    /**
     * 上传接口
     * @author yyj
     */
    @FeignClient(name="ldd-upload",configuration =  MultipartSupportConfig.class)
    public interface UploadControllerFeign {
    
        /**
         * 图片上传
         * @param files
         * @return
         */
        @RequestMapping(method = RequestMethod.POST, value = "/uploadMultipleFile",consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
        Result uploadImg(@RequestPart("file") MultipartFile[] files);
    }

### 5.controller层调用 ###

@PostMapping("/uploadMultipleFile")
        public Result uploadImg(@RequestPart("file") MultipartFile[] files){
            try {
                return uploadControllerFeign.uploadImg(files);
            }catch (Exception e){
                log.info("文件上传异常"+ ExceptionUtils.getStackTrace(e));
                return new Result(ResultCode.FAIL,"文件上传异常");
            }
        }