import feign.codec.Encoder;
import feign.form.spring.SpringFormEncoder;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.context.annotation.Bean;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RequestPart;
import org.springframework.web.multipart.MultipartFile;
 
/**
 * @author linli
 * @date 20-06-27
 */
@FeignClient(value = "upload", fallbackFactory = UploadFallbackFactory.class, configuration = UploadClient.MultipartSupportConfig.class)
public interface UploadClient {
 
    @PostMapping(path = "/upload-text", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    String uploadText(@RequestPart(name = "file") MultipartFile file);
 
    /**
     * 引用配置類(lèi)MultipartSupportConfig.并且實(shí)例化
     */
    class MultipartSupportConfig {
        @Bean
        public Encoder feignFormEncoder() {
            return new SpringFormEncoder();
        }
    }
}

<dependency>
    <groupId>io.github.openfeign.form</groupId>
    <artifactId>feign-form</artifactId>
	<version>3.3.0</version>
</dependency>
<dependency>
	<groupId>io.github.openfeign.form</groupId>
	<artifactId>feign-form-spring</artifactId>
	<version>3.3.0</version>
</dependency>

private String uploadFile(String str) {
        FileOutputStream fos = null;
        FileInputStream fis = null;
        MultipartFile multipartFile = null;
        byte[] bt = str.getBytes();
        File file = null;
        try {
            file = File.createTempFile("file" + UUID.randomUUID(), ".txt");
            fos = new FileOutputStream(file);
            fos.write(bt, 0, bt.length);
            fis = new FileInputStream(file);
            multipartFile = new MockMultipartFile("file", file.getName(),
                    MediaType.TEXT_PLAIN_VALUE, fis);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (fis != null) {
                try {
                    fis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (fos != null) {
                try {
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return uploadClient.uploadText(multipartFile);
    }

<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>

package com.ruiyi.twowayreferral.configurer;
import feign.codec.Encoder;
import feign.form.spring.SpringFormEncoder;
import org.springframework.beans.factory.ObjectFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.cloud.openfeign.support.SpringEncoder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class MultipartSupportConfig {
? ?@Autowired
? ?private ObjectFactory<HttpMessageConverters> messageConverters;
? ?@Bean
? ?public Encoder feignFormEncoder() {
? ? ? ?return new SpringFormEncoder(new SpringEncoder(messageConverters));
? ?}
}

@FeignClient(value = "controller-center")
public interface CallFrignService {
? ? /**
? ? ?* @Create 文件上傳 wanggx_ruiyi 2019.11.15
? ? ?* @param uploadPath 文件上傳地址
? ? ?* @param file 上傳的文件
? ? ?* @return
? ? ?*/
? ?@PostMapping(value = "/api/v1/common/file/fileUpload",consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
? ?String fileUpload(@RequestParam(value = "uploadPath", required = true) String uploadPath,@RequestPart(value = "file", required = true) MultipartFile file);
}