一、前端代码
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<el-upload class="step_content" drag         action="string"         ref="upload"         :multiple="false"         :http-request="createAppVersion"         :data="appVersion"         :auto-upload="false"         :limit="1"         :on-change="onFileUploadChange"         :on-remove="onFileRemove">    <i class="el-icon-upload"></i>    <div class="el-upload__text">将文件拖到此处,或<em>点击上传</em></div></el-upload> <div class="mgt30">    <el-button v-show="createAppVisible" :disabled="createAppDisable" type="primary" class="mgt30"          @click="onSubmitClick">立即创建    </el-button> </div>.... onSubmitClick() {    this.$refs.upload.submit();   },   createAppVersion(param) {    this.globalLoading = true;    const formData = new FormData();    formData.append(‘file‘, param.file);    formData.append(‘appVersion‘, JSON.stringify(this.appVersion));    addAppVersionApi(formData).then(res => {     this.globalLoading = false;     this.$message({message: ‘创建APP VERION 成功‘, type: ‘success‘});     this.uploadFinish();    }).catch(reason => {     this.globalLoading = false;     this.showDialog(reason);    })   }, | 
说明:
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const formData = new FormData();formData.append(‘file‘, param.file);formData.append(‘appVersion‘, JSON.stringify(this.appVersion)); | 
6.addAppVersionApi 最终会调用下面的方法,其中formData就是param, 请求需要加header: ‘Content-Type‘: ‘multipart/form-data‘
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function httpPostMutipartFileAsyn(url, param) { return new Promise((resolve, reject) => {  request({   url: url,   headers: {    ‘Content-Type‘: ‘multipart/form-data‘   },   method: ‘post‘,   data: param  }).then(response => {   if (response.data.status.code === 0) {    resolve(response.data)   } else {    reject(response.data.status)   }  }).catch(response => {   reject(response)  }) })} | 
二、后端代码
1.后端controller接口
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@PostMapping("/version/add")  public RestResult addAppVersion(@RequestParam("appVersion") String appVersion,                  @RequestParam("file") MultipartFile multipartFile) {    ....         return new RestResult();  } | 
三、Feign 实现服务间传递MultipartFile参数
Controller的addAppVersion()接口,收到上传的文件后,需要通过Http调用远程接口,将文件上传到资源服务。一开始尝试使用OKHttp 和 RestTemplate 实现,但是这两种方法都必须将文件先保存,无法直接传递MultipartFile参数,然后才能通过OKHttp 和 RestTemplate提供的相关接口去实现。 本着不想在本地保存临时文件的,找到了通过Feign解决的一种方式
1.添加如下依赖:
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<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.Feign 接口实现
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@FeignClient(name = "resource-client",url = "http://xxxx",path = "resource",configuration = ResourceServiceFeignClient.MultipartSupportConfig.class)public interface ResourceServiceFeignClient {  @PostMapping(value = "/upload", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)  Resource upload(@RequestPart("file") MultipartFile file);  class MultipartSupportConfig {    @Bean    public Encoder feignFormEncoder() {      return new SpringFormEncoder();    }  }} | 
这里Feign是通过url实现的接口调用,并没有通过SpringCloud注册中心服务发现来实现接口调用,因为我所在的项目是独立在服务化体系外的
3.将Feign接口自动注入,正常使用就行了。
vue使用el-upload上传文件及Feign服务间传递文件的方法
原文:https://www.cnblogs.com/lorelei123/p/10688837.html