• Feign实现微服务间文件上传


    在Spring Cloud 的Feign组件中并不支持文件的传输,会出现这样的错误提示:

    feign.codec.EncodeException: class [Lorg.springframework.web.multipart.MultipartFile; is not a type supported by this encoder.
        at feign.codec.Encoder$Default.encode(Encoder.java:90) ~[feign-core-9.5.1.jar:na]
        at feign.form.FormEncoder.encode(FormEncoder.java:87) ~[feign-form-3.3.0.jar:3.3.0]
        at feign.form.spring.SpringFormEncoder.encode(SpringFormEncoder.java:64) ~[feign-form-spring-3.3.0.jar:3.3.0]

    但是我们可以通过使用Feign的扩展包实现这个功能。

    一. 示例介绍

    服务名 端口号 角色
    feign_upload_first 8100 feign服务提供者
    feign_upload_second 8101 feign服务消费者

    我们调用feign_upload_second的上传文件接口上传文件,feign_upload_second内部使用feign调用feign_upload_first实现文件上传。

    二 、单文件上传

    2.1 feign_upload_first服务提供者

    文件上传的服务提供者接口比较简单,如下所示:


    @SpringBootApplication
    public class FeignUploadFirstApplication {
      @RestController
      public class UploadController {
        
        @RequestMapping(value = "/uploadFile",method = RequestMethod.POST, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
        public String handleFileUpload(@RequestPart(value = "file") MultipartFile file) {
          return file.getOriginalFilename();
        }
      }
      public static void main(String[] args) {
        SpringApplication.run(FeignUploadFirstApplication.class, args);
      }
    }

    2.2 feign_upload_second服务消费者

    1. 增加扩展包依赖,依赖包不能太高级,会报错
          <dependency>
            <groupId>io.github.openfeign.form</groupId>
            <artifactId>feign-form</artifactId>
            <version>3.3.0</version>
          </dependency>
          <dependency>
            <groupId>io.github.openfeign.form</groupId>
            <artifactId>feign-form-spring</artifactId>
            <version>3.3.0</version>
          </dependency>
          <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.3</version>
          </dependency>
    2. 新增feign实现文件上传的配置类
      import feign.codec.Encoder;
      import feign.form.spring.SpringFormEncoder;
      import org.springframework.context.annotation.Bean;
      import org.springframework.context.annotation.Configuration;
      
      @Configuration
      public class FeignSupportConfig {
        @Bean
        public Encoder feignFormEncoder() {
          return new SpringFormEncoder();
        }
      }
    3. feign远程调用接口
      @FeignClient(name = "file",url = "http://localhost:8100",configuration = FeignSupportConfig.class)
      public interface UploadService {
        @RequestMapping(value = "/uploadFile", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
        String handleFileUpload(@RequestPart(value = "file") MultipartFile file);
      }
    4. 上传文件接口
      @RestController
      public class UploadController {
        @Autowired
        UploadService uploadService;
        
        @RequestMapping(value = "/uploadFile",method = RequestMethod.POST, consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
        public String handleFileUpload(@RequestPart(value = "file") MultipartFile file) {
          return uploadService.handleFileUpload(file);
        }
      }

      2.3 测试

      使用postman进行测试,可以正常上传文件

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  • 原文地址:https://www.cnblogs.com/tanyucong/p/13177343.html
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