一、前端代码
<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：
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'
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
@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：
<dependency>
<groupId>io.github.openfeign.form</groupId>
<artifactId>feign-form</artifactId>
<version>3.0.3</version>
<https://img.qb5200.com/download-x/dependency>
<dependency>
<groupId>io.github.openfeign.form</groupId>
<artifactId>feign-form-spring</artifactId>
<version>3.0.3</version>
<https://img.qb5200.com/download-x/dependency>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.3</version>
<https://img.qb5200.com/download-x/dependency>
2.Feign 接口实现
@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。
