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拦截器类似于过滤器，但拦截器只拦截Action，并且可以获取任意的Bean。本节将阐述如何使用拦截器。

1、前提约束

2、操作步骤

• 在src文件夹下创建net.wanho.system..java，内容如下：

import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class LoginIntecepterHandle implements HandlerInterceptor {    //api执行之前    @Override    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {        System.out.println("preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o)");        //获取存储在session中的用户信息        Object object = httpServletRequest.getSession().getAttribute("user");        if(object==null)        {            //如果用户信息为空，则重定向到登录界面，并且阻止向下执行            httpServletResponse.sendRedirect("/login.jsp");            return false;        }        return true;    }    //api执行之后，页面渲染之前    @Override    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {        System.out.println("postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView)");    }    //api执行之后，页面渲染之后    @Override    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {        System.out.println("afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e)");    }}

• 修改spring-mvc.xml，加入以下内容：

• 启动tomcat，测试，任意的action请求都将被拦截。
  以上就是springmvc中拦截器的使用。

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