vue中request.js中axios请求和（若依）文件通用下载方法封装

vue中request.js中axios请求和（若依）文件通用下载方法封装

1.request.js

import axios from 'axios' 
import {  Message, Loading } from 'element-ui'
import { saveAs } from 'file-saver'
// 创建axios实例
const request = axios.create({// 这里可以放一下公用属性等。baseURL: '/api', // 用于配置请求接口公用部分，请求时会自动拼接在你定义的url前面。配合跨域使用withCredentials: true, // 跨域请求时是否需要访问凭证timeout: 3 * 1000, // 请求超时时间})request.interceptors.response.use((response) => {
if(response.request.responseType ===  'blob' || response.request.responseType ===  'arraybuffer'){return response.data}let { code, msg } = response.datareturn response;
}, (error) => {return Promise.reject(error)
})let downloadLoadingInstance;export function download(url, params, filename) {downloadLoadingInstance = Loading.service({text: "正在下载数据，请稍候",spinner: "el-icon-loading",background: "rgba(0, 0, 0, 0.7)",})return request.post(url, params, { transformRequest: [(params) => {return tansParams(params)}],headers: {'Content-Type': 'application/x-www-form-urlencoded'},responseType: 'blob'}).then(async (data) => {const isLogin = await blobValidate(data);if (isLogin) {const blob = new Blob([data])saveAs(blob, filename)} else {const resText = await data.text();const rspObj = JSON.parse(resText);const errMsg = errorCode[rspObj.code] || rspObj.msg || errorCode['default']Message.error(errMsg);}downloadLoadingInstance.close();}).catch((r) => {Message.error('下载文件出现错误，请联系管理员！')downloadLoadingInstance.close();})}export async function blobValidate(data) {try {const text = await data.text();JSON.parse(text);return false;} catch (error) {return true;}}export function tansParams(params) {let result = ''for (const propName of Object.keys(params)) {const value = params[propName];var part = encodeURIComponent(propName) + "=";if (value !== null && value !== "" && typeof (value) !== "undefined") {if (typeof value === 'object') {for (const key of Object.keys(value)) {if (value[key] !== null && value !== "" && typeof (value[key]) !== 'undefined') {let params = propName + '[' + key + ']';var subPart = encodeURIComponent(params) + "=";result += subPart + encodeURIComponent(value[key]) + "&";}}} else {result += part + encodeURIComponent(value) + "&";}}}return result}
export default request;//记得暴露出去

2.main,js引入该方法（以对象方式引入），并注册

import {download } from "./utils/request"Vue.prototype.download = download

3.请求使用（api包下）

import request from '@/utils/request'
//查询当前目录下的文件
export function getFileList(query){return request({url: '/config/sysUpgrade/getFileList',method: 'get',params:query})}//上传文件export function uploadFile(data){return request({url: '/config/sysUpgrade/uploadFile',method: 'post',data: data})}

4.通过下载文件方法使用

download()方法里面需传3个参数

• url为后端给的下载方法的后半段
• params为需要下载的数量
• filename为下载的名字与类型

使用时直接this.download()方法调用

 downloadFile(data){let file = data.absolutePath;// “/”分割绝对路径let list = file.split("/");// 最后一个就是文件名let fileName = list[list.length-1];//调用通用下载方法this.download("config/sysUpgrade/downloadFile",{file,},fileName)}

5.vue.config.js配置解决跨域问题（配置后重启生效）

module.exports = { //打包后生成的文件夹名称，默认dist		devServer:{    //前端地址port: 8080,	//前段的端口号proxy: {'/api': {target: 'http://localhost:30000',//后端接口地址changeOrigin: true,  //是否允许跨域pathRewrite: {'^/api': '' //注册全局路径}},}}
};