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    io.github.openfeign.form    feign-form    3.4.1    io.github.openfeign.form    feign-form-spring    3.4.1                        io.github.openfeign                        feign-httpclient                        ${feign.version}                                                        io.github.openfeign                        feign-core                        ${feign.version}                                                        io.github.openfeign                        feign-hystrix                        ${feign.version}                                                        io.github.openfeign                        feign-slf4j                        ${feign.version}                

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

@Overridepublic 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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