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拦截器Intercepter

news 2025/9/1 23:48:09

1、编写LoginInterceptor类实现 `HandlerInterceptor` 接口

public class LoginInterceptor implements HandlerInterceptor {@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {//1.获取sessionHttpSession session = request.getSession();//2.获取session中的用户Object user = session.getAttribute("user");//3.判断用户是否存在if(user == null){//4.不存在，拦截，返回401状态码response.setStatus(401);return false;}//5.存在，保存用户信息到ThreadlocalUserHolder.saveUser((User)user);//6.放行return true;}@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {// 清理ThreadLocal中的用户UserHolder.removeUser();}
}

注意：实现方法之后，使用快捷键ctrl+i实现这两个方法

2. 注册拦截器到 Spring MVC

@Configuration
public class MvcConfig implements WebMvcConfigurer {/*** 配置拦截器* @param registry*/@Overridepublic void addInterceptors(InterceptorRegistry registry) {// 登录拦截器registry.addInterceptor(new LoginInterceptor()).excludePathPatterns("/shop/**","/voucher/**","/shop-type/**","/upload/**","/blog/hot","/user/code","/user/login");}
}

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