Feign中怎么利用httpclient实现文件上传

本篇文章为大家展示了Feign中怎么利用httpclient实现文件上传，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。

Requirements

The feign-form extension depend on OpenFeign and its concrete versions:

• all feign-form releases before 3.5.0 works with OpenFeign 9.* versions;

• starting from feign-form's version 3.5.0, the module works with OpenFeign 10.1.0 versions and greater.

IMPORTANT: there is no backward compatibility and no any gurantee that the feign-form's versions after 3.5.0work with OpenFeign before 10.*. OpenFeign was refactored in 10th release, so the best approach - use the freshest OpenFeign and feign-form versions.

Notes:

• spring-cloud-openfeign uses OpenFeign 9.* till v2.0.3.RELEASE and uses 10.* after. Anyway, the dependency already has suitable feign-form version, see dependency pom, so you don't need to specify it separately;

• spring-cloud-starter-feign is a deprecated dependency and it always uses the OpenFeign's 9.* versions.

使用了如下版本pom，接口httpclient下文件上传内容被篡改问题

feign-version = 9.6.0 <dependency>     <groupId>io.github.openfeign.form</groupId>     <artifactId>feign-form</artifactId>     <version>3.4.1</version> </dependency> <dependency>     <groupId>io.github.openfeign.form</groupId>     <artifactId>feign-form-spring</artifactId>     <version>3.4.1</version> </dependency> <dependency>	<groupId>io.github.openfeign</groupId>	<artifactId>feign-httpclient</artifactId>	<version>${feign.version}</version>	</dependency>	<dependency>	<groupId>io.github.openfeign</groupId>	<artifactId>feign-core</artifactId>	<version>${feign.version}</version>	</dependency>	<dependency>	<groupId>io.github.openfeign</groupId>	<artifactId>feign-hystrix</artifactId>	<version>${feign.version}</version>	</dependency>	<dependency>	<groupId>io.github.openfeign</groupId>	<artifactId>feign-slf4j</artifactId>	<version>${feign.version}</version>	</dependency>

多附件文件上传问题

默认SpringFormEncoder只处理单文件，一个强转就完事了

@Override public void encode (Object object, Type bodyType, RequestTemplate template) throws EncodeException {   if (!bodyType.equals(MultipartFile.class)) {     super.encode(object, bodyType, template);     return;   }   val file = (MultipartFile) object;   val data = singletonMap(file.getName(), object);   super.encode(data, MAP_STRING_WILDCARD, template); }

我们系统文件上传支持多附件，这个需要重写下

/**  * @author yugj  * @date 2019/8/28 下午4:27.  */ public class FeignSpringFormEncoder extends FormEncoder {     /**      * Constructor with the default Feign's encoder as a delegate.      */     public FeignSpringFormEncoder() {         this(new Default());     }     /**      * Constructor with specified delegate encoder.      *      * @param delegate delegate encoder, if this encoder couldn't encode object.      */     public FeignSpringFormEncoder(Encoder delegate) {         super(delegate);         MultipartFormContentProcessor processor = (MultipartFormContentProcessor) getContentProcessor(ContentType.MULTIPART);         processor.addWriter(new SpringSingleMultipartFileWriter());         processor.addWriter(new SpringManyMultipartFilesWriter());     }     @Override     public void encode(Object object, Type bodyType, RequestTemplate template) throws EncodeException {         if (bodyType.equals(MultipartFile.class)) {             MultipartFile file = (MultipartFile) object;             Map data = Collections.singletonMap(file.getName(), object);             super.encode(data, MAP_STRING_WILDCARD, template);             return;         } else if (bodyType.equals(MultipartFile[].class)) {             MultipartFile[] file = (MultipartFile[]) object;             if(file != null) {                 Map data = Collections.singletonMap(file.length == 0 ? "" : "file", object);                 super.encode(data, MAP_STRING_WILDCARD, template);                 return;             }         }         super.encode(object, bodyType, template);     } }

对应feignclient使用这个配置即可

@Service @FeignClient(name = "xx-file-sv",         fallbackFactory = FileGeneralHystrixFallbackAdapter.class,         configuration = FeignSpringFormEncoder.class) public interface IFileClient extends IFile { }

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