feign多文件上传

参考地址：https://www.cnblogs.com/standup/p/9090113.html

　　　　　https://www.cnblogs.com/standup/p/9093753.html

1、服务消费方pom引用Feign-form依赖：

    <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>
            <version>1.3.3</version>
        </dependency>

2、服务消费方声明一个“FeignSpringFormEncoder”类（这个类copy自”SpringFormEncoder”接口）：

import feign.RequestTemplate;
import feign.codec.EncodeException;
import feign.codec.Encoder;
import feign.form.ContentType;
import feign.form.FormEncoder;
import feign.form.MultipartFormContentProcessor;
import feign.form.spring.SpringManyMultipartFilesWriter;
import feign.form.spring.SpringSingleMultipartFileWriter;
import org.springframework.web.multipart.MultipartFile;

import java.lang.reflect.Type;
import java.util.Collections;
import java.util.Map;

/**
 * author：YZH
 * time: 2019/4/29 15:35
 * description: 多文件上传配置
 **/
public class FeignSpringFormEncoder extends FormEncoder {
    public FeignSpringFormEncoder() {
        this(new Default());
    }
    public FeignSpringFormEncoder(Encoder delegate) {
        super(delegate);
        MultipartFormContentProcessor processor = (MultipartFormContentProcessor)this.getContentProcessor(ContentType.MULTIPART);
        processor.addWriter(new SpringSingleMultipartFileWriter());
        processor.addWriter(new SpringManyMultipartFilesWriter());
    }

    public void encode(Object object, Type bodyType, RequestTemplate template) throws EncodeException {
        if (bodyType.equals(MultipartFile.class)) {
            MultipartFile file = (MultipartFile) object;
            Map<String, Object> 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<String, Object> data = Collections.singletonMap(file.length==0?"":file[0].getName(), object);
                super.encode(data, MAP_STRING_WILDCARD, template);
                return;
            }
        }
        super.encode(object, bodyType, template);
    }
}

3、将“FeignSpringFormEncoder”作为bean提供给框架，代替“SpringFormEncoder”的“encode()”接口：

import feign.codec.Encoder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Primary;
import org.springframework.context.annotation.Scope;

/**
 * author：YZH
 * time: 2019/4/29 15:37
 **/
public class FeignMultipartSupportConfig {
    @Bean
    @Primary
    @Scope("prototype")
    public Encoder multipartFormEncoder() {
        return new FeignSpringFormEncoder();
    }
}

4、feign调用

import com.example.eurekaclient.conf.FeignMultipartSupportConfig;
import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

/**
 * author：YZH
 * time: 2018/6/14 10:59
 **/
@FeignClient(value = "service-feign",configuration = FeignMultipartSupportConfig.class)
public interface Hiservice {

    @RequestMapping(value = "/other")
    String test(@RequestParam("name")String name,@RequestParam("age")int age);

    @PostMapping(value = "uploadFiles",consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
     String uploadFiles(@RequestPart(value = "files")MultipartFile[] files,@RequestParam(value = "time") String time);

    @PostMapping(value = "upload",consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    String upload(@RequestPart(value = "file")MultipartFile file);
}

5、服务消费方控制层