Spring-mvc自定义拦截器实现

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实现接口HandlerInterceptor，然后分别实现afterCompletion、postHandle、preHandle三个方法，

例如：

public boolean preHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2) throws Exception {
       // TODO Auto-generated method stub
       System.out.println("prehandle");
       User user=(User) arg0.getSession().getAttribute("user");
       if(user==null){
              arg0.getRequestDispatcher("/login.jsp").forward(arg0, arg1);
           return false;
       }
       return true;
   }

spring-mvc配置文件实现自定义拦截器的两种方式：

1.非注解实现：

<mvc:interceptors>
<mvc:interceptor> <mvc:mapping path="/user"/> <bean class="com.interceptor.inter1" /> </mvc:interceptor>
</mvc:interceptors>

2.注解实现：注解实现spring提供了两个类，分别是DefaultAnnotationHandlerMapping和 AnnotationMethodHandlerAdapter

DefaultAnnotationHandlerMapping的实现方法：‘

<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping">
        <property name="interceptors">
            <list>
                <bean class="com.interceptor.inter1"/>
            </list>
        </property>
</bean>

附上xml的头信息：

    xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:tx="http://www.springframework.org/schema/tx"
   xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-2.5.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
   http://www.springframework.org/schema/mvc
   http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">

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