Spring Boot 笔记 026 文章分类列表查询

1.1 pinia

1.1.1 安装pinia npm install pinia

1.1.2 安装persist npm install pinia-persistedstate-plugin

1.1.2 在vue应用实例中使用pinia，在pinia中使用persist

1.1.3 在src/stores/token.js中定义store，定义状态Store时指定持久化配置参数

//定义store
import {defineStore} from 'pinia'
import {ref} from 'vue'
/* 
    第一个参数:名字,唯一性
    第二个参数:函数,函数的内部可以定义状态的所有内容

    返回值: 函数
*/
export const useTokenStore = defineStore('token',()=>{
    //定义状态的内容

    //1.响应式变量
    const token = ref('')

    //2.定义一个函数,修改token的值
    const setToken = (newToken)=>{
        token.value = newToken
    }

    //3.函数,移除token的值
    const removeToken = ()=>{
        token.value=''
    }

    return {
        token,setToken,removeToken
    }
},{
    persist:true//持久化存储
});

1.1.4 在组件中使用store

1.1.4.1 在login.vue中使用store将token存储到pinia中

 1.1.4.2 在axios中添加请求拦截器使用pinia中的token

//定制请求的实例

//导入axios  npm install axios
import axios from 'axios';

import { ElMessage } from 'element-plus'
//定义一个变量,记录公共的前缀  ,  baseURL
//const baseURL = 'http://localhost:8080';
const baseURL = '/api';
const instance = axios.create({ baseURL })

import {useTokenStore} from '@/stores/token.js'
//添加请求拦截器
instance.interceptors.request.use(
    (config)=>{
        //请求前的回调
        //添加token
        const tokenStore = useTokenStore();
        //判断有没有token
        if(tokenStore.token){
            config.headers.Authorization = tokenStore.token
        }
        return config;
    },
    (err)=>{
        //请求错误的回调
        Promise.reject(err)
    }
)

/* import {useRouter} from 'vue-router'
const router = useRouter(); */

import router from '@/router'
//添加响应拦截器
instance.interceptors.response.use(
    result => {
        //判断业务状态码
        if(result.data.code===0){
            return result.data;
        }

        //操作失败
        //alert(result.data.msg?result.data.msg:'服务异常')
        ElMessage.error(result.data.msg?result.data.msg:'服务异常')
        //异步操作的状态转换为失败
        return Promise.reject(result.data)
        
    },
    err => {
        //判断响应状态码,如果为401,则证明未登录,提示请登录,并跳转到登录页面
        if(err.response.status===401){
            ElMessage.error('请先登录')
            router.push('/login')
        }else{
            ElMessage.error('服务异常')
        }
       
        return Promise.reject(err);//异步的状态转化成失败的状态
    }
)

export default instance;

1.1.4.3 在article.js中发送请求

import request from '@/utils/request.js'
//文章分类列表查询
export const articleCategoryListService = ()=>{
    const tokenStore = useTokenStore();
    //在pinia中定义的响应式数据,都不需要.value
       return request.get('/category')
}

1.1.5 articlecategory.vue 编写页面并调用接口

```html
<script setup>
import {
    Edit,
    Delete
} from '@element-plus/icons-vue'
import { ref } from 'vue'
const categorys = ref([
    {
        "id": 3,
        "categoryName": "美食",
        "categoryAlias": "my",
        "createTime": "2023-09-02 12:06:59",
        "updateTime": "2023-09-02 12:06:59"
    },
    {
        "id": 4,
        "categoryName": "娱乐",
        "categoryAlias": "yl",
        "createTime": "2023-09-02 12:08:16",
        "updateTime": "2023-09-02 12:08:16"
    },
    {
        "id": 5,
        "categoryName": "军事",
        "categoryAlias": "js",
        "createTime": "2023-09-02 12:08:33",
        "updateTime": "2023-09-02 12:08:33"
    }
])

    //声明一个异步的函数
    import { articleCategoryListService } from '@/api/article.js'
    const articleCategoryList = async () => {
        let result = await articleCategoryListService();
        categorys.value = result.data;

    }
    articleCategoryList();
</script>
<template>
    <el-card class="page-container">
        <template #header>
            <div class="header">
                <span>文章分类</span>
                <div class="extra">
                    <el-button type="primary">添加分类</el-button>
                </div>
            </div>
        </template>
        <el-table :data="categorys" style="width: 100%">
            <el-table-column label="序号" width="100" type="index"> </el-table-column>
            <el-table-column label="分类名称" prop="categoryName"></el-table-column>
            <el-table-column label="分类别名" prop="categoryAlias"></el-table-column>
            <el-table-column label="操作" width="100">
                <template #default="{ row }">
                    <el-button :icon="Edit" circle plain type="primary" ></el-button>
                    <el-button :icon="Delete" circle plain type="danger"></el-button>
                </template>
            </el-table-column>
            <template #empty>
                <el-empty description="没有数据" />
            </template>
        </el-table>
    </el-card>
</template>

<style lang="scss" scoped>
.page-container {
    min-height: 100%;
    box-sizing: border-box;

    .header {
        display: flex;
        align-items: center;
        justify-content: space-between;
    }
}
</style>
```

1.2 未登录统一处理

//定制请求的实例

//导入axios  npm install axios
import axios from 'axios';
import { ElMessage } from 'element-plus'
//定义一个变量,记录公共的前缀  ,  baseURL
const baseURL = '/api';
const instance = axios.create({baseURL})

import {useTokenStore} from '@/stores/token.js'
//添加请求拦截器
instance.interceptors.request.use(
    (config)=>{
        //请求前的回调
        //添加token
        const tokenStore = useTokenStore();
        //判断有没有token
        if(tokenStore.token){
            config.headers.Authorization = tokenStore.token
        }
        return config;
    },
    (err)=>{
        //请求错误的回调
        Promise.reject(err)
    }
)

import router from '@/router'
//添加响应拦截器
instance.interceptors.response.use(
    result => {
        //判断业务状态码
        if(result.data.code===0){
            return result.data;
        }

        //操作失败
        //alert(result.data.msg?result.data.msg:'服务异常')
        ElMessage.error(result.data.msg?result.data.msg:'服务异常')
        //异步操作的状态转换为失败
        return Promise.reject(result.data)
        
    },
    err => {
        //判断响应状态码,如果为401,则证明未登录,提示请登录,并跳转到登录页面
        if(err.response.status===401){
            ElMessage.error('请先登录')
            router.push('/login')
        }else{
            ElMessage.error('服务异常')
        }
       
        return Promise.reject(err);//异步的状态转化成失败的状态
    }
)

export default instance;