axios封装终极版实现token无感刷新及全局loading

前言

关于axios全局loading的封装博主已经发过一次了，这次是在其基础上增加了token的无感刷新。

token无感刷新流程

• 首次登录的时候会获取到两个token（AccessToken，RefreshToken）
• 持久化保存起来（localStorage方案）
• 正常请求业务接口的时候携带AccessToken
• 当接口口返回401权限错误时，使用RefreshToken请求接口获取新的AccessToken
• 替换原有旧的AccessToken，并保存
• 继续未完成的请求，携带AccessToken
• RefreshToken也过期了，跳转回登录页面，重新登录

后端设计

这里采用node简单实现的后台接口服务

• 后端存有两个字段，分别保存长短token，并且每一段时间更新他们
• 短token过期，返回 returncode:104；长token过期，返回 returncode: 108；请求成功返回returncode: 0；
• 请求头中pass用来接收客户端长token，请求头中authorization用来接收客户端短token

1、创建一个新文件夹，通过vscode打开，运行：

npm init -y 

2、安装koa

npm i koa -s 

3、安装nodemon

npm i nodemon -g 

4、使用路由中间件

npm i koa-router -S 

5、跨域处理

npm i koa2-cors 

6、新建routes/index.js

const router = require("koa-router")();
let accessToken = "init_s_token"; //短token
let refreshToken = "init_l_token"; //长token

/* 5s刷新一次短token */
setInterval(() => {accessToken = "s_tk" + Math.random();
}, 5000);

/* 一小时刷新一次长token */
setInterval(() => {refreshToken = "l_tk" + Math.random();
}, 600000);

/* 登录接口获取长短token */
router.get("/login", async (ctx) => {ctx.body = {returncode: 0,accessToken,refreshToken,};
});

/* 获取短token */
router.get("/refresh", async (ctx) => {//接收的请求头字段都是小写的let { pass } = ctx.headers;if (pass !== refreshToken) {ctx.body = {returncode: 108,info: "长token过期，重新登录",};} else {ctx.body = {returncode: 0,accessToken,};}
});

/* 获取应用数据1 */
router.get("/getData", async (ctx) => {let { authorization } = ctx.headers;if (authorization !== accessToken) {ctx.body = {returncode: 104,info: "token过期",};} else {ctx.body = {code: 200,returncode: 0,data: { id: Math.random() },};}
});

/* 获取应用数据2 */
router.get("/getData2", async (ctx) => {let { authorization } = ctx.headers;if (authorization !== accessToken) {ctx.body = {returncode: 104,info: "token过期",};} else {ctx.body = {code: 200,returncode: 0,data: { id: Math.random() },};}
});

module.exports = router; 

7、创建index.js文件

const Koa = require('koa')
const app = new Koa();
const index = require('./routes/index')

const cors = require('koa2-cors');

app.use(cors());

app.use(index.routes(),index.allowedMethods())

app.listen(4000,() => {console.log('server is listening on port 4000')
}) 

8、`配置package.json

"dev":"nodemon index.js", 

9、运行 npm run dev，这时服务端已准备好

npm run dev

前端源码

interceptors.ts

/** axios封装
 * 请求拦截、相应拦截、错误统一处理
 */
import Axios from "axios";
import { ElMessage, ElLoading } from "element-plus";
import _ from "lodash";
import router from "@/router";
import BaseRequest from "@/request/request";
const axios = Axios.create({
  //baseURL: localStorage.getItem("address")?.toString(), // url = base url + request url
  // timeout: 50000 // request timeout
});
// loading对象
let loadingInstance: { close: () => void } | null;
// 变量isRefreshing
let isRefreshing = false;
// 后续的请求队列
let requestList: ((newToken: any) => void)[] = [];
// 请求合并只出现一次loading
// 当前正在请求的数量
let loadingRequestCount = 0;
// post请求头
axios.defaults.headers.post["Content-Type"] = "application/json;charset=UTF-8";
// request interceptor

axios.interceptors.request.use(
  (config: any) => {
    let loadingTarget = "body";
    if (config.headers.loadingTarget) {
      loadingTarget = config.headers.loadingTarget;
    }
    const isShowLoading = config.headers.isShowLoading;
    const target = document.querySelector(loadingTarget);
    if (target && !isShowLoading) {
      // 请求拦截进来调用显示loading效果
      showLoading(loadingTarget);
    }
    // do something before request is sent
    // if (sessionStorage.getItem("token")) {
    //   config.headers.Authorization =
    //     "Bearer " + sessionStorage.getItem("token"); // 让每个请求携带自定义 token 请根据实际情况自行修改
    // }
    if (config.url) {
      // 此处为 Refresh Token 专用接口，请求头使用 Refresh Token
      if (config.url.indexOf("/refresh") >= 0) {
        config.headers.Authorization = localStorage.getItem("RefreshToken");
      } else if (!(config.url.indexOf("/login") !== -1)) {
        // 其他接口，请求头使用 Access Token
        config.headers.Authorization = localStorage.getItem("accessToken");
      }
    }

    return config;
  },
  服务器托管网(error) => {
    // do something with request error
    console.log(error); // for debug
    return Promise.reject(error);
  }
);
// http response 拦截器
axios.interceptors.response.use(
  async (response) => {
    setTimeout(() => {
      hideLoading();
    }, 200);
    const data = response.data;
    if (data.code == "401") {
      // 控制是否在刷新token的状态
      if (!isRefreshing) {
        // 修改isRefreshing状态
        isRefreshing = true;
        // 这里是获取新token的接口，方法在这里省略了。
        const url = `/refresh`;
        const BaseRequestFun = new BaseRequest(url, "");
        BaseRequestFun.get().then(async (res) => {
          if (res && res.accessToken) {
            console.log("a");
            // 新token
            const newToken = res.accessToken;
            // 保存新的accessToken
            localStorage.setItem("accessToken", newToken);
            // 替换新accessToken
            response.config.headers.Authorization = newToken;
            // token 刷新后将数组里的请求队列方法重新执行
            requestList.forEach((cb) => cb(newToken));
            // 重新请求完清空
            requestList = [];

            // 继续未完成的请求
            const resp = await axios.request(response.config);
            // 重置状态
            isRefreshing = false;
            // 返回请求结果
            return resp;
          } else {
            // 清除token
            localStorage.clear();
            // 重置状态
            isRefreshing = false;
            // 跳转到登录页
            router.replace("/");
          }
        });
      } else {
        // 后面的请求走这里排队
        // 返回未执行 resolve 的 Promise
        return new Promise((resolve) => {
          // 用函数形式将 resolve 存入，等待获取新token后再执行
          requestList.push((newToken) => {
            response.config.headers.Authorization = newToken;
            resolve(axios(response.config));
          });
        });
      }
    }
    return data;
  },
  (err) => {
    setTimeout(() => {
      hideLoading();
    }, 200);
    // 返回状态码不为200时候的错误处理
    ElMessage({
      message: err.toString(),
      type: "error",
      duration: 5 * 1000,
    });
    return Promise.resolve(err);
  }
);
// 显示loading的函数 并且记录请求次数 ++
const showLoading = (target: any) => {
  if (loadingRequestCount === 0) {
    loadingInstance = ElLoading.service({
      lock: true,
      text: "加载中...",
      target: target,
      background: "rgba(255,255,255,0.5)",
    });
  }
  loadingRequestCount++;
};

// 隐藏loading的函数，并且记录请求次数
const hideLoading = () => {
  if (loadingRequestCount  0) return;
  loadingRequestCount--;
  if (loadingRequestCount === 0) {
    toHideLoading();
  }
};

// 防抖：将 300ms 间隔内的关闭 loading 便合并为一次. 防止连续请求时, loading闪烁的问题。
const toHideLoading = _.debounce(() => {
  // eslint-disable-next-line @typescript-eslint/ban-ts-comment
  // @ts-ignore
  loadingInstance.close();
  loadingInstance = null;
}, 300);

export default axios;

request.ts

import instance from "./interceptors";
import { ElMessage } from "element-plus";

export default class baseRequest {
  private url: any;
  private params: any;

  constructor(url: any, params: any) {
    this.url = url;
    this.params = typeof params === "undefined" ? {} : params;
  }

  get(...params: any[]) {
    return instance
      .get(this.url, {
        params: this.params,
        headers: {
          loadingTarget: params[0],
          isShowLoading: params[1] === undefined ? true : params[1],
        },
      })
      .then((res: any) => {
        if (res.code === 200) {
          return Promise.resolve(res);
        } else {
          ElMessage({
            message: res.entitys[Object.keys(res.entitys)[0]],
            type: "error",
            duration: 5 * 1000,
          });
          return Promise.resolve(false);
        }
      })
      .catch((e) => {
        ElMessage({
          message: e,
          type: "error",
          duration: 5 * 1000,
        });
        Promise.resolve(false);
      });
  }

  post(...params: any[]) {
    return instance
      .post(this.url, this.params, {
        headers: {
          loadingTarget: params[0],
          isShowLoading: params[1] === undefined ? true : params[1],
        },
      })
      .then((res: any) => {
        if (res.code === "200") {
          return Promise.resolve(res.entitys);
        } else {
          ElMessage({
            message: res.entitys[Object.keys(res.entitys)[0]],
            type: "error",
            duration: 5 * 1000,
          });
          Promise.resolve(false);
        }
      })
      .catch((e) => {
        ElMessage({
          message: e,
          type: "error",
          duration: 5 * 1000,
        });
        Promise.resolve(false);
      });
  }

  put(...params: any[]) {
    return instance
      .put(this.url, this.params, {
        headers: {
          loadingTarget: params[0],
          isShowLoading: params[1] === undefined ? true : params[1],
        },
      })
      .then((res: any) => {
        if (res.code === "200") {
          return Promise.resolve(res.entitys);
        } else {
          ElMessage({
            message: res.entitys[Object.keys(res.entitys)[0]],
            type: "error",
            duration: 5 * 1000,
          });
          Promise.resolve(false);
        }
      })
      .catch((e) => {
        ElMessage({
          message: e,
          type: "error",
          duration: 5 * 1000,
        });
        Promise.resolve(false);
      });
  }

  delete(...params: any[]) {
    return instance
      .delete(this.url, {
        params: this.params,
        headers: {
          loadingTarget: params[0],
          isShowLoading: params[1] === undefined ? true : params[1],
        },
      })
      .then((res: any) => {
        if (res.code === "200") {
          return Promise.resolve(res.entitys);
        } else {
          ElMessage({
            message: res.entitys[Object.keys(res.entitys)[0]],
            type: "error",
            duration: 5 * 1000,
          });
          Promise.resolve(false);
        }
      })
      .catch((e) => {
        ElMessage({
          message: e,
          type: "error",
          duration: 5 * 1000,
        });
        Promise.resolve(false);
      });
  }

  upfile(...params: any[]) {
    return instance
      .post(this.url, this.params, {
        headers: {
          "Content-Type": "multipart/form-data",
          "X-Requested-With": "XMLHttpRequest",
          loadingTarget: params[0],
          isShowLoading: params[1] === undefined ? true : params[1],
        },
      })
      .then((res: any) => {
        if (res.code === "200") {
          return Promise.resolve(res.entitys);
        } else {
          ElMessage({
            message: res.entitys[Object.keys(res.entitys)[0]],
            type: "error",
            duration: 5 * 1000,
          });
          Promise.resolve(false);
        }
      })
      .catch((e) => {
        ElMessage({
          message: e,
          type: "error",
          duration: 5 * 1000,
        });
        Promise.resolve(false);
      });
  }

  downfile(...params: any[]) {
    return instance
      .post(this.url, this.params, { responseType: "blob" })
      .then((res: any) => {
        const fileReader = new FileReader()服务器托管网;
        fileReader.onload = function (e: any) {
          try {
            const jsonData = JSON.parse(e.target.result); // 说明是普通对象数据，后台转换失败
            if (jsonData.code) {
              ElMessage({
                message: jsonData.message,
                type: "error",
                duration: 5 * 1000,
              });
              Promise.resolve(false);
            }
          } catch (err) {
            // 解析成对象失败，说明是正常的文件流
            const url = window.URL.createObjectURL(res);
            const eleLink = document.createElement("a");
            eleLink.href = url;
            eleLink.download = params[2];
            // eleLink.download = "1.xls";
            document.body.appendChild(eleLink);
            eleLink.click();
            window.URL.revokeObjectURL(url);
          }
        };
        fileReader.readAsText(res);
      })
      .catch((e) => {
        ElMessage({
          message: e,
          type: "error",
          duration: 5 * 1000,
        });
        Promise.resolve(false);
      });
  }
  icd9Export() {
    return instance
      .post(this.url, this.params, { responseType: "blob" })
      .then((res: any) => {
        const fileReader = new FileReader();
        fileReader.onload = function (e: any) {
          try {
            const jsonData = JSON.parse(e.target.result); // 说明是普通对象数据，后台转换失败
            if (jsonData.code) {
              ElMessage({
                message: jsonData.message,
                type: "error",
                duration: 5 * 1000,
              });
              Promise.resolve(false);
            }
          } catch (err) {
            // 解析成对象失败，说明是正常的文件流
            const url = window.URL.createObjectURL(res);
            const eleLink = document.createElement("a");
            eleLink.href = url;
            eleLink.download = "icd9.xls";
            document.body.appendChild(eleLink);
            eleLink.click();
            window.URL.revokeObjectURL(url);
          }
        };
        fileReader.readAsText(res);
      })
      .catch((e) => {
        ElMessage({
          message: e,
          type: "error",
          duration: 5 * 1000,
        });
        Promise.resolve(false);
      });
  }
  icd10Export() {
    return instance
      .post(this.url, this.params, { responseType: "blob" })
      .then((res: any) => {
        const fileReader = new FileReader();
        fileReader.onload = function (e: any) {
          try {
            const jsonData = JSON.parse(e.target.result); // 说明是普通对象数据，后台转换失败
            if (jsonData.code) {
              ElMessage({
                message: jsonData.message,
                type: "error",
                duration: 5 * 1000,
              });
              Promise.resolve(false);
            }
          } catch (err) {
            // 解析成对象失败，说明是正常的文件流
            const url = window.URL.createObjectURL(res);
            const eleLink = document.createElement("a");
            eleLink.href = url;
            eleLink.download = "icd10.xls";
            document.body.appendChild(eleLink);
            eleLink.click();
            window.URL.revokeObjectURL(url);
          }
        };
        fileReader.readAsText(res);
      })
      .catch((e) => {
        ElMessage({
          message: e,
          type: "error",
          duration: 5 * 1000,
        });
        Promise.resolve(false);
      });
  }
}

测试vue

template>
  div>
    el-button type="primary" @click="login()">登录/el-button>
    el-button type="primary" @click="getData()">接口一/el-button>
    el-button type="primary" @click="getData2()">接口二/el-button>
  /div>
/template>

script lang="ts" setup>
import BaseRequest from "@/request/request";
const login = () => {
  const url = `/login`;
  const BaseRequestFun = new BaseRequest(url, "");
  BaseRequestFun.get().then((res) => {
    if (res) {
      console.log();
      localStorage.setItem("accessToken", res.accessToken);
      localStorage.setItem("RefreshToken", res.refreshToken);
    }
  });
};
const getData = () => {
  const url = `/getData`;
  const BaseRequestFun = new BaseRequest(url, "");
  BaseRequestFun.get().then((res) => {
    if (res) {
      console.log(res);
    }
  });
};
const getData2 = () => {
  const url = `/getData2`;
  const BaseRequestFun = new BaseRequest(url, "");
  BaseRequestFun.get().then((res) => {
    if (res) {
      console.log(res);
    }
  });
};
/script>

style lang="scss">/style>

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