浏览器刷新后丢失 JWT 令牌

Question

我正在学习使用 Spring Boot 2.0 和 React 进行全栈开发。身份验证和授权由 JWT 管理，应用程序按预期工作，只是刷新浏览器后必须重新登录。即使浏览器刷新后如何维护 JWT 令牌？

import React, { Component } from 'react';
    import TextField from '@material-ui/core/TextField';
    import Button from '@material-ui/core/Button';
    import Snackbar from '@material-ui/core/Snackbar';
    import Carlist from './Carlist';
    import {SERVER_URL} from '../constants.js';

    class Login extends Component {
      constructor(props) {
        super(props);
        this.state = {username: '', password: '', isAuthenticated: false, open: false};
      }

      logout = () => {
        sessionStorage.removeItem("jwt");
        this.setState({isAuthenticated: false});
    }

      login = () => {
        const user = {username: this.state.username, password: this.state.password};
        fetch(SERVER_URL + 'login', {
          method: 'POST',
          body: JSON.stringify(user)
        })
        .then(res => {
          const jwtToken = res.headers.get('Authorization');
          if (jwtToken !== null) {
            sessionStorage.setItem("jwt", jwtToken);
            this.setState({isAuthenticated: true});
          }
          else {
            this.setState({open: true});  // maintient snackbar ouvert
          }
        })
        .catch(err => console.error(err))
      }

      handleChange = (event) => {
        this.setState({[event.target.name] : event.target.value});
      }

      handleClose = (event) => {
        this.setState({ open: false });
      }

      render() {
        if (this.state.isAuthenticated === true) {
          return (<Carlist />)
        }
        else {
          return (
            <div>
              <br/>
              <TextField tpye="text" name="username" placeholder="Username"
              onChange={this.handleChange} /><br/>
              <TextField type="password" name="password" placeholder="Password"
              onChange={this.handleChange} /><br /><br/>
              <Button variant="raised" color="primary" onClick={this.login}>Login</Button>
              <Snackbar
              open={this.state.open}  onClose={this.handleClose}
              autoHideDuration={1500} message='Check your username and password' />
            </div>
          );
        }
      }
    }

    export default Login;

Answer 1

我会使用本地存储而不是像这样的会话存储

localStorage.setItem("jwt", jwtToken)

而不是线

sessionStorage.setItem("jwt", jwtToken);

检查开发控制台中的本地存储，刷新页面并查看它是否仍然存在。它可能需要在您的身份验证流程中进行一些其他更改才能基于 localStorage 而不是 sessionStorage 构建它；但是，这将解决页面刷新时丢失 jwt 的直接问题。