在Spring Cloud封装的Feign中并不直接支持传文件,但可以通过引入Feign的扩展包来实现,本来就来具体说说如何实现。
服务提供方(接收文件)
服务提供方的实现比较简单,就按Spring MVC的正常实现方式即可,比如:
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@RestController
public class UploadController {
@PostMapping (value = "/uploadFile" , consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
public String handleFileUpload( @RequestPart (value = "file" ) MultipartFile file) {
return file.getName();
}
}
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服务消费方(发送文件)
在服务消费方由于会使用Feign客户端,所以在这里需要在引入feign对表单提交的依赖,具体如下:
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< dependency >
< groupId >io.github.openfeign.form</ groupId >
< artifactId >feign-form</ artifactId >
< version >3.0.3</ version >
</ dependency >
< dependency >
< groupId >io.github.openfeign.form</ groupId >
< artifactId >feign-form-spring</ artifactId >
< version >3.0.3</ version >
</ dependency >
< dependency >
< groupId >commons-fileupload</ groupId >
< artifactId >commons-fileupload</ artifactId >
</ dependency >
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定义FeignClient,假设服务提供方的服务名为 upload-server
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@FeignClient (value = "upload-server" , configuration = TestServiceClient.MultipartSupportConfig. class )
public interface UploadService {
@PostMapping (value = "/uploadFile" , consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
String handleFileUpload( @RequestPart (value = "file" ) MultipartFile file);
@Configuration
class MultipartSupportConfig {
@Bean
public Encoder feignFormEncoder() {
return new SpringFormEncoder();
}
}
}
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在启动了服务提供方之后,尝试在服务消费方编写测试用例来通过上面定义的Feign客户端来传文件,比如:
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@Test
@SneakyThrows
public void testHandleFileUpload() {
File file = new File( "files/aaa.txt" );
DiskFileItem fileItem = (DiskFileItem) new DiskFileItemFactory().createItem( "file" ,
MediaType.TEXT_PLAIN_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 multi = new CommonsMultipartFile(fileItem);
log.info(testServiceClient.handleFileUpload(multi));
}
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以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:http://blog.didispace.com/spring-cloud-starter-dalston-2-4