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springcloud如何使用Feign后台内部传递MultipartFile

2022-03-04 11:52:52 作者：linli1991

这篇文章主要介绍了springcloud如何使用Feign后台内部传递MultipartFile，具有很好的参考价值，希望对大家有所帮助。如有错误或未考虑完全的地方，望不吝赐教

如何使用Feign后台内部传递MultipartFile

先修改Feign Client接口

 
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);
 
    /**
     * 引用配置类MultipartSupportConfig.并且实例化
     */
    class MultipartSupportConfig {
        @Bean
        public Encoder feignFormEncoder() {
            return new SpringFormEncoder();
        }
    }
}

若SpringFormEncoder 引入报错，加上下面的依赖

<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>

内部调用

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);
    }

注意点

Feign进行跨服务传递MultipartFile文件

通过调用服务进行文件上传，避免每个需要上传文件的模块都写一遍上传服务，造成代码冗余。

本文主要包含通过feign进行文件上传模块。

使技术人员在开发过程中遇到问题时有地可查，有章可循。

通过feign进行跨服务传递MultipartFile文件

添加依赖

<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>

添加配置文件

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));
   }
}

代码示例

@FeignClient(value = "controller-center")
public interface CallFrignService {
    /**
     * @Create 文件上传 wanggx_ruiyi 2019.11.15
     * @param uploadPath 文件上传地址
     * @param file 上传的文件
     * @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);
}

以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。