[业务流程]JWT实现单点登录(SpringBoot + Vue +axious)

JWT实现单点登录(SpringBoot + Vue +axious)

准备阶段:

**登录所需对象**admin{"username":"", //作为Token"password":"", //作为签名"nicakname":"","avatar":"",}

开始阶段

1.导包

<dependency><groupId>com.auth0</groupId><artifactId>java-jwt</artifactId><version>3.10.3</version></dependency>

2.创建一个TokenUtils(放在util包下)

public class TokenUtils {public static String getToken(admin admin){String token="";token= JWT.create().withAudience(admin.getUsername()) // 将 username 保存到 token 里面.withExpiresAt(DateUtil.offsetHour(new Date(),1)) //1小时后token过期(DateUtil是hutool包下的).sign(Algorithm.HMAC256(admin.getPassword())); // 以 password 作为 oken的密钥,默认用HMAC256加密return token;}}

3.在admin的相应controller下创建login方法

@PostMapping("/login")// 1.接收前端传来的登录前Json对象public Result login(@RequestBody admin admin){String username = admin.getUsername();String password = admin.getPassword();if (username == "" || password == "") {throw new ServiceException(Constants.CODE_401,"没有输入");}​// 2.进行登录操作，验证数据库是否有该对象，并得到登录后对象com.pinkman.management.entity.admin loginAdmin = adminService.login(admin);​// 3.将Token设置进登录后对象String token = TokenUtils.getToken(loginAdmin);loginAdmin.setToken(token);// 4.返回给前端return new Result(adminService.login(admin) == null?Constants.CODE_200:Constants.CODE_401,"成功",loginAdmin);}

前端阶段

1.前端登录方法

login() {var user = {username: this.username,password: this.password,};​this.request.post("http://localhost:8888/admin/login", user).then((res) => {console.log(res);if (res.code == "401") {​localStorage.setItem("user", JSON.stringify(res.data));//储存Token信息localStorage.setItem("token", res.data.token);​this.$router.push("/");} else {this.$message.error("用户名或密码错误");}});

tips:前端传给后端时候，正确token:xxx.yyy.zzz,不正确token:"xxx.yyy.zzz"

成功写入本地存储：

2.在前端Vue集成的项目中对axious进行配置

import axios from 'axios'// request 拦截器// 可以自请求发送前对请求做一些处理// 比如统一加token，对请求参数统一加密request.interceptors.request.use(config => {config.headers['Content-Type'] = 'application/json;charset=utf-8';// 在这里拿到Token信息并且写入到请求的头中去config.headers['token'] = localStorage.getItem("token");return config}, error => {return Promise.reject(error)});

Token成功写入请求头

验证阶段

1.前端发送任意带token的请求给后端

2.在后端的config包下的interceptor包下配置相应拦截器(配置校验规则)

@Componentpublic class JwtHandlerInterceptor implements org.springframework.web.servlet.HandlerInterceptor {​@Autowiredprivate adminService adminService;​@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {String token = request.getHeader("token");// 0.如果不是映射方法，则直接通过if (!(handler instanceof HandlerMethod)) {return true;}​// 1.先通过token获取相应的用户名if (StringUtils.isBlank(token)) {throw new ServiceException(Constants.CODE_401,"无Token,请先登录");}String username;try{username = JWT.decode(token).getAudience().get(0);}catch (JWTDecodeException j){throw new ServiceException(Constants.CODE_401,"Token验证失败");}​​​// 2.根据获取到的用户名查询数据库是否存在该用户admin admin = adminService.getAdminByName(username);if (admin == null) {throw new ServiceException(Constants.CODE_401,"用户不存在");}// 用户密码加签 验证TokenJWTVerifier jwtVerifier = JWT.require(Algorithm.HMAC256(admin.getPassword())).build();​​// 3.若存在，则对签名进行核验try {​jwtVerifier.verify(token); // 验证token} catch (JWTVerificationException e) {e.printStackTrace();}System.out.println("成功验证");// 4.核验完成则返回truereturn true;​}}

3.在后端的config包下创建拦截器JwtInterceptorConfig配置(让服务器知道拦截器的存在)

// 1.配置注解@Configuration// 2.实现WebMvcConfigurer接口public class InterceptorConfig implements WebMvcConfigurer {​@Beanpublic JwtHandlerInterceptor getJwtHandlerInterceptor(){return new JwtHandlerInterceptor();}// 3.重写方法，将jwt拦截器注册进拦截器注册中心(让web应用上下文知道拦截器的存在)@Overridepublic void addInterceptors(InterceptorRegistry registry) {registry.addInterceptor(getJwtHandlerInterceptor()).addPathPatterns("/**") // 拦截所有请求，通过判断token是否合法来决定是否登录.excludePathPatterns("/admin/login");// 排除部分,如，登录请求(必须排除),导入请求，导出请求}}

tips:拦截器在初始化时候记得放进spring容器中