第4讲引入JWT前后端交互

引入JWT前后端交互

Json web token (JWT), 是为了在网络应用环境间传递声明而执行的一种基于JSON的开放标准（(RFC
7519)；
JWT就是一段字符串，用来进行用户身份认证的凭证，该字符串分成三段【头部、载荷、签证】

后端接口测试：

@RestController
@RequestMapping("/test")
public class TestController {

    @Autowired
    private SysUserService sysUserService;
    
    @GetMapping("/user/list")
    public R userList(@RequestHeader(required = false) String token){
        if(StringUtil.isNotEmpty(token)){
            Map<String,Object> resutMap=new HashMap<>();
            List<SysUser> userList = sysUserService.list();
            resutMap.put("userList",userList);
            return R.ok(resutMap);
        }else{
            return R.error(401,"没有权限访问");
        }


    }

    @GetMapping("/login")
    public R login(){
        String token= JwtUtils.genJwtToken("java1234");
        return R.ok().put("token",token);
    }
    
}

前端测试：

<template>

  <el-button type="primary" @click="handleLogin">测试登录</el-button>
  <el-button type="danger" @click="handleUserList">测试获取用户列表信息</el-button>

</template>
<script setup>
import requestUtil from '@/util/request'
import store from '@/store'

const handleLogin=async()=>{
  let result=await requestUtil.get("test/login");
  let data=result.data;
  if(data.code==200){
    const token=data.token;
    console.log("登录成功：token="+token);
    store.commit('SET_TOKEN',token);
  }else{
    console.log("登录出错！")
  }
}

const handleUserList=async ()=>{
  let result=await requestUtil.get("test/user/list");
  let data=result.data;
  if(data.code==200){
    const userList=data.userList;
    console.log("用户列表信息：userList="+userList);
  }else{
    console.log("出错！")
  }
}

</script>
<style>

</style>

跨越问题：

@Configuration
public class WebAppConfigurer implements WebMvcConfigurer {

    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowedOrigins("*")
                .allowCredentials(true)
                .allowedMethods("GET", "HEAD", "POST", "PUT", "DELETE","OPTIONS")
                .maxAge(3600);
    }

  
}

封装request.js

// 引入axios
import axios from 'axios';
import store from '@/store'

let baseUrl="http://localhost:80/";
// 创建axios实例
const httpService = axios.create({
    // url前缀-'http:xxx.xxx'
    // baseURL: process.env.BASE_API, // 需自定义
    baseURL:baseUrl,
    // 请求超时时间
    timeout: 3000 // 需自定义
});

//添加请求和响应拦截器
// 添加请求拦截器
httpService.interceptors.request.use(function (config) {
    // 在发送请求之前做些什么
    //config.headers.token=window.sessionStorage.getItem('token');
    console.log("store="+store.getters.GET_TOKEN)
    config.headers.token=store.getters.GET_TOKEN
    return config;
}, function (error) {
    // 对请求错误做些什么
    return Promise.reject(error);
});

// 添加响应拦截器
httpService.interceptors.response.use(function (response) {
    // 对响应数据做点什么
    return response;
}, function (error) {
    // 对响应错误做点什么
    return Promise.reject(error);
});

/*网络请求部分*/

/*
 *  get请求
 *  url:请求地址
 *  params:参数
 * */
export function get(url, params = {}) {
    return new Promise((resolve, reject) => {
        httpService({
            url: url,
            method: 'get',
            params: params
        }).then(response => {
            resolve(response);
        }).catch(error => {
            reject(error);
        });
    });
}

/*
 *  post请求
 *  url:请求地址
 *  params:参数
 * */
export function post(url, params = {}) {
    return new Promise((resolve, reject) => {
        httpService({
            url: url,
            method: 'post',
            data: params
        }).then(response => {
            console.log(response)
            resolve(response);
        }).catch(error => {
            console.log(error)
            reject(error);
        });
    });
}

/*
 *  文件上传
 *  url:请求地址
 *  params:参数
 * */
export function fileUpload(url, params = {}) {
    return new Promise((resolve, reject) => {
        httpService({
            url: url,
            method: 'post',
            data: params,
            headers: { 'Content-Type': 'multipart/form-data' }
        }).then(response => {
            resolve(response);
        }).catch(error => {
            reject(error);
        });
    });
}

export function getServerUrl(){
    return baseUrl;
}

export default {
    get,
    post,
    fileUpload,
    getServerUrl
}