拦截器

自定义拦截器

实现HandlerInterceptor类

public class MyInterceptor implements HandlerInterceptor {
    // return true; 执行下一个拦截器,放行
    // return false; 不执行下一个拦截器
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("=============处理前==============");
        return true;
    }

    // 拦截日志
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("=============处理后==============");
    }

    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("==============清理=============");
    }
}

配置拦截器

spring-mvc.xml

    <!--拦截器配置-->
    <mvc:interceptors>
        <mvc:interceptor>
            <!--包括这个请求下的所有请求-->
            <mvc:mapping path="/**"/>
            <bean class="com.song.config.MyInterceptor"/>
        </mvc:interceptor>
        <mvc:interceptor>
            <!--包括这个请求下的所有请求-->
            <mvc:mapping path="/user/**"/>
            <mvc:exclude-mapping path="/user/login"/>
            <bean class="com.song.config.LoginInterceptor"/>
        </mvc:interceptor>
    </mvc:interceptors>