Springboot+ SpringCloud FeignClient发送MultipartFile

桃扇骨 2022-04-03 04:28 377阅读 0赞

1.服务端

1.1 服务端（文件接收方）接口：

@ApiOperation(value = "保存备份文件", notes = "保存备份文件", consumes = MediaType.MULTIPART_FORM_DATA_VALUE, produces = "application/json")
        @PostMapping(value = "/saveBackFile")
        @ResponseBody
        public Response saveBackFile(
                @ApiParam(value = "文件附加信息") @Valid BackupFileAttachInfo fileInfo,
                @ApiParam(value = "备份文件") @RequestPart("file") MultipartFile file);

1.2 服务端增加一个对象注入（可通过一个配置类的方法注入），配置文件上传临时目录

@Bean
        public MultipartConfigElement multipartConfigElement() {
            MultipartConfigFactory factory = new MultipartConfigFactory();
            factory.setLocation("d:/"); //配置文件上传临时目录
            return factory.createMultipartConfig();
        }

2.客户端

2.0 SpringBoot启动类要增加  @EnableFeignClients 注解，否则，FeignClient不会生效！

2.1 首先pom中要增加feign和eureka等的依赖，还要加入下面的依赖：

<dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-test</artifactId>
                <version>5.1.3.RELEASE</version>
                <scope>compile</scope>
            </dependency>
            
            <dependency>
                <groupId>io.github.openfeign.form</groupId>
                <artifactId>feign-form-spring</artifactId>
                <version>3.4.1</version>
            </dependency>
            
            <dependency>
                <groupId>io.github.openfeign.form</groupId>
                <artifactId>feign-form</artifactId>
                <version>3.4.1</version>
            </dependency>
            
            <dependency>
                <groupId>commons-fileupload</groupId>
                <artifactId>commons-fileupload</artifactId>
                <version>1.3.3</version>
            </dependency>

2.2 FeignClient

@Service
    @FeignClient(name = "MODEL-LIB",value="MODEL-LIB" , configuration = FeignMultipartSupportConfig.class,url="http://127.0.0.1:8080/file") 
    public interface ModellibFeignClient {
        @PostMapping(value = "/saveBackFile" ,consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
        @ResponseBody
        public BaseResponsev1 saveBackFile(
                @ApiParam(value = "租户id") @RequestParam("tenant") String tenant,
                @ApiParam(value = "project") @RequestParam("project") String project,
                @ApiParam(value = "namespace") @RequestParam("namespace") String namespace,
                @ApiParam(value = "username") @RequestParam("username") String username,
                @ApiParam(value = "备份文件")  @RequestPart("file")  MultipartFile file);
    }

2.3 Feign配置类，主要是对MultipartFile上传时的编码相关：FeignMultipartSupportConfig，如果不配置这个类，默认会将文件也编译成json，导致报错：

@Configuration
    public class FeignMultipartSupportConfig {
        @Autowired
        private ObjectFactory<HttpMessageConverters> messageConverters;
    
        @Bean
        @Primary
        @Scope("prototype")
        public Encoder multipartFormEncoder() {
            return new SpringFormEncoder(new SpringEncoder(messageConverters));
        }
    
        @Bean
        public feign.Logger.Level multipartLoggerLevel() {
            return Logger.Level.FULL;
        }
    }

2.4 调用FeignClient

File file = new File("d://lq.jpg");
    
    	MultipartFile multipartFile = null;
    
    	DiskFileItem fileItem = (DiskFileItem) new DiskFileItemFactory().createItem("file", //这个file对应feignClient中的MultipartFile参数名，写错就会报400 ："message":"Required request part 'file' is not present"这个错误，切记！
    	        MediaType.MULTIPART_FORM_DATA_VALUE, true, file.getName());
    
    	try (InputStream input = new FileInputStream(file); OutputStream os = fileItem.getOutputStream()) {
    	    IOUtils.copy(input, os);
    	} catch (Exception e) {
    	    throw new IllegalArgumentException("Invalid file: " + e, e);
    	}
    
    	multipartFile = new CommonsMultipartFile(fileItem);
    
    	System.out.println(multipartFile);
    	BaseResponsev1 response = modellibFeignClient.saveBackFile("lq", "zwr", "zhh", "zhh1", multipartFile);

完全照此步骤操作，可保证FeignClient上传MultipartFile成功！

至此完成！