每个接口都要获取token来拿用户信息? 拦截器+线程池 优化 token

1,创建线程池:

public class UserHolder {

    private static ThreadLocal<User> tl =new ThreadLocal<User>();

    // 存数据
    public static void saveUser(User user){
        tl.set(user);
    }

    //取数据
    public static User getUser(){
        return tl.get();
    }

    //删除数据
    public static void removeUser(){
        tl.remove();
    }

}

2,创建拦截器:

@Component
public class TokenInterceptor implements HandlerInterceptor {
    @Autowired
    private UserService userService;

    @Override//在controller前拦截
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 获取token  getHeader获取单个请求头Authorization对应的value值
        String token = request.getHeader("Authorization");//请求参数Authorization 令牌=token
        if (token == null) {
            response.setStatus(400);
            return false;

        }

        User user = userService.fromRedisUser(token);
        if(user==null){
            response.setStatus(400); //权限不足
            return false;//中断请求
        }
        // 将用户放在threadLocal中
        UserHolder.saveUser(user);
        // 放行
        return true;
    }


    @Override//响应结束 threadLocal移除对象
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        UserHolder.removeUser(); //移除对象
    }
}

这样,需要根据token来获取用户信息的地方就可以直接:

User user = UserHolder.getUser();

再也不用每次都往接口里传token了

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