• 拦截器的使用

    1注册一个拦截器

    @Configuration
public class WebMvcConfig extends WebMvcConfigurerAdapter {

  //注册一个拦截器
  @Autowired
  AuthInterceptor authInterceptor;

  @Override
  public void addInterceptors(InterceptorRegistry registry) {
      registry.addInterceptor(authInterceptor).addPathPatterns("/**");
  }
}

    2编写拦截器逻辑

    @Component
public class AuthInterceptor extends HandlerInterceptorAdapter {
  @Override
  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
          throws Exception {
       //....
}

  • 注解的使用

    1编写一个注解

    @Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)    // source  : override    class    runtime
public @interface LoginRequire {

  boolean autoRedirect() default true;
}

    2在拦截器中获取该路由的注解，并添加业务逻辑

    @Component
public class AuthInterceptor extends HandlerInterceptorAdapter {
  @Override
  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
          throws Exception {
       //....
}
    //判断是否该请求需要用户登录
      //取到请求的方法上的注解  LoginRequire
      HandlerMethod handlerMethod = (HandlerMethod) handler;
      LoginRequire loginRequire = handlerMethod.getMethodAnnotation(LoginRequire.class);
      if(loginRequire!=null){
      //
      }else{
      //