基於feign傳參MultipartFile問題解決

2022-03-04 13:00:23

feign傳參MultipartFile問題

首先，feign服務之間的呼叫，傳參預設的格式為：ContentType=application/x-www-form-urlencoded

以表單的形式傳參的，而檔案流的傳參，需要form-data的ContentType，否則會報錯的

首先引入依賴

 <dependency>
            <groupId>io.github.openfeign.form</groupId>
            <artifactId>feign-form</artifactId>
            <version>3.8.0</version>
        </dependency>
 
        <dependency>
            <groupId>io.github.openfeign.form</groupId>
            <artifactId>feign-form-spring</artifactId>
            <version>3.8.0</version>
        </dependency>

注意spring boot版本是2.x以上的，上面兩個依賴的版本不低於3.5.0，否則還是無效的

新建feign的設定

package com.wm.blog_config.config; 
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; 
 
/**
 * @author ：半卷流年
 * @description : 解決feign傳遞流資料的異常
 * @createTime ：2020/6/14
 */
@Configuration
public class FeignSupportConfig { 
    @Autowired
    private ObjectFactory<HttpMessageConverters> messageConverters;
 
    @Bean
    public Encoder feignFormEncoder() {
        return new SpringFormEncoder(new SpringEncoder(messageConverters));
    } 
}

在feign介面中設定

package com.wm.blog_admin.feign; 
import com.wm.blog_admin.feign.factory.PictureClientFallbackFactory;
import com.wm.blog_common.constatnt.CommonConstant;
import com.wm.blog_common.domain.TFileDO;
import com.wm.blog_common.entity.TFile;
import com.wm.blog_common.req.TFileQuery;
import com.wm.blog_common.result.Result;
import com.wm.blog_config.config.CustomFeignConfig;
import com.wm.blog_config.config.FeignSupportConfig;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile; 
import java.util.List;
 
/***
 * @ClassName: PictureFeignClient
 * @Description: picture feign呼叫  todo feign使用get有坑啊,是否考慮使用HttpClient替換feign的HttpURLConnection，採用apache的HttpClient
 * @Author: wm_yu
 * @Create_time: 16:39 2020-3-26
 */
@FeignClient(value = CommonConstant.PICTURE_MODULE_NAME, configuration = {CustomFeignConfig.class, FeignSupportConfig.class}, fallbackFactory = PictureClientFallbackFactory.class)
public interface PictureFeignClient {
 
    /**
     * id查詢圖片資訊
     * @param id
     * @return
     */
    @GetMapping("/web/picture/{id}")
    Result<TFileDO> get(@PathVariable("id") Long id); 
 
    /**
     * id批次查詢圖片資訊
     * @param idList
     * @return
     */
    @PostMapping("/web/picture/getByIdList")
    Result<List<TFile>> getByIdList(@RequestBody List<Long> idList); 
 
    /**
     * 檔案上傳
     * @param file
     * @return
     */
    @PostMapping(value = "/web/picture/uploadFile",produces = {MediaType.APPLICATION_JSON_UTF8_VALUE},consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
     Result<String> uploadFile(@RequestPart("file") MultipartFile file);
 
}

注意加上這個，表示傳參格式：

就可以傳參了的

Feign傳輸 MultipartFile的一些問題

File轉MultipartFile

pom.xml

<!-- https://mvnrepository.com/artifact/org.springframework/spring-mock -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-mock</artifactId>
<version>2.0.8</version>
</dependency>

public static MultipartFile getMultipartFile(String fileName, File file) throws IOException {
    return new MockMultipartFile(fileName, file.getName(), ContentType.APPLICATION_OCTET_STREAM.toString(), new FileInputStream(file));
}

報錯 Current request is not a multipart request、Content type ‘’ not supported

@PostMapping設定 consumes = MediaType.MULTIPART_FORM_DATA_VALUE

使用@RequestPart()，不能使用@RequestParam()

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

報錯 Required request part ‘file’ is not present

configuration

@Configuration
public class UploadFeignConfig {
    @Bean
    public Encoder multipartFormEncoder() {
        return new SpringFormEncoder(new SpringEncoder(new ObjectFactory<HttpMessageConverters>() {
            @Override
            public HttpMessageConverters getObject() throws BeansException {
                return new HttpMessageConverters(new RestTemplate().getMessageConverters());
            }
        }));
    }
}

FeignClient

@FeignClient(value = FileConstants.FILE_SERVER, configuration= UploadFeignConfig.class)
public interface FileServiceClient extends IFileServiceClient {
    @Override
    @PostMapping(value = "/upload", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    ResultBody upload(@RequestPart(value = "file") MultipartFile file);
}

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