spring拦截器的定义

package edu.mybatis.interceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

public class MyHandlerIntercepter implements HandlerInterceptor{

//进入handler之前
//身份认证，身份授权
public boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1,
Object arg2) throws Exception {
System.out.println("lanjie=====1");
return true;
}
//进入handler之后，返回modelandview之前
//ModelAndView:将公用的模型数据（菜单导航）传到视图
public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,
Object arg2, ModelAndView arg3) throws Exception {
System.out.println("lanjie=====1");

}
//执行完handler之后
//统一异常处理，统一日志处理
public void afterCompletion(HttpServletRequest arg0,
HttpServletResponse arg1, Object arg2, Exception arg3)
throws Exception {
System.out.println("lanjie=====1");

}

}

<!--拦截器 -->
<mvc:interceptors>
<!--多个拦截器,顺序执行 -->
<mvc:interceptor>
<mvc:mapping path="/**"/>
<bean class="edu.mybatis.interceptor.HandlerIntercepter"/>
</mvc:interceptor>
</mvc:interceptors>