springmvc自定义拦截器

<!-- 注册自定义的拦截器 -->
<mvc:interceptors>
<mvc:interceptor>
<!-- 指定当前的拦截器拦截的路径 -->
<mvc:mapping path="/user/*"/>
<bean class="cn.internet.intercepter.MyIntercepter"></bean>
</mvc:interceptor>
</mvc:interceptors>

package cn.internet.intercepter;

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

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

/**
* 自定义拦截器
* @author    zhangbin
*
*/
public class MyIntercepter implements HandlerInterceptor{

@Override
public void afterCompletion(HttpServletRequest arg0,
HttpServletResponse arg1, Object arg2, Exception arg3)
throws Exception {
System.out.println("------------afterCompletion------------");

}

@Override
public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,
Object arg2, ModelAndView arg3) throws Exception {
System.out.println("------------postHandle------------");

}

@Override
public boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1,
Object arg2) throws Exception {
System.out.println("------------preHandle------------");
//拦截客户端请求，检查权限，如果没有权限，返回false
//权限检查从session里面把登录用户拿出来 根据登录用户来获得角色，根据角色获得权限，
//根据权限来判断当前你访问的地址对应的是哪个权限 看这个用户权限里面是否包含 如果有就放行，如果没有那就直接跳转到没有权限页面

return true;
}

}