SpringMVC 拦截器 【vaynexiao】

只需要实现HandlerInterceptor接口即可成为拦截器
class MyInterceptor implements HandlerInterceptor

<!--关于拦截器的配置-->
<mvc:interceptors>
    <mvc:interceptor>
        <!--/** 包括路径及其子路径-->
        <!--/admin/* 拦截的是/admin/add等等这种 , /admin/add/user不会被拦截-->
        <!--/admin/** 拦截的是/admin/下的所有-->
        <mvc:mapping path="/**"/>
        <!--bean配置的就是拦截器-->
        <bean id="loginInterceptor" class="com.kuang.interceptor.MyInterceptor"/>
    </mvc:interceptor>
</mvc:interceptors>

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class MyInterceptor implements HandlerInterceptor {
    //在请求处理的方法之前执行
    //如果返回true执行下一个拦截器，放行程序
    //如果返回false就不执行下一个拦截器，停止程序
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
        System.out.println("------------处理前------------");
        return true;
    }
    //在请求处理方法执行之后执行
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        System.out.println("------------处理后------------");
    }
    //在dispatcherServlet处理后执行,做清理工作.
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        System.out.println("------------清理------------");
    }
}

此时写一个Controller类，print一句"666666666666666666666666",调用请求后
------------处理前------------
666666666666666666666666
------------处理后------------
------------清理--------------