OpenFeign传输文件MultipartFile

OpenFeign默认不支持文件上传，需要通过引入Feign的扩展包来实现，添加依赖
Maven增加依赖：

<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>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.3.3</version>
</dependency>

添加如下配置类：

@Configuration
public class FeignConfiguration {
    @Autowired
    private ObjectFactory<HttpMessageConverters> messageConverters;
    @Bean
    public Encoder feignEncoder() {
        return new SpringFormEncoder(new SpringEncoder(messageConverters));
    }
}

调用方FeignService接口：

@FeignClient("client2")
public interface Client2FeignService {
    // PostMapping注解的consumes要设置成MediaType.MULTIPART_FORM_DATA_VALUE，不然会直接报错
    @PostMapping(value = "/hello/test", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    // MultipartFile类型前面用@RequestPart注解修饰，不然文件会传输不过去
    String test(@RequestPart(value = "file") MultipartFile file);
}

文件接收方Controller：

@RestController
@RequestMapping("/hello")
public class HelloController {
    @PostMapping("/test")
    String test(@RequestPart(value = "file") MultipartFile file) {
        System.out.println(file.getSize());
        return "ok";
    }
}

参考：https://www.cnblogs.com/wwjj4811/p/15348543.html