Spring MVC自定义拦截器

自定义拦截器要实现org.springframework.web.servlet.handler.HandlerInterceptorAdapter类。

如果基于xml配置使用Spring MVC，可以利用SimpleUrlHandlerMapping、BeanNameUrlHandlerMapping进行Url映射（相当于struts的path映射）和拦截请求（注入interceptors）。如果基于注解使用Spring MVC，可以使用DefaultAnnotationHandlerMapping注入interceptors。注意无论基于xml还是基于注解，HandlerMapping bean都是需要在xml中配置的。

public class TimeBasedAccessInterceptor extends HandlerInterceptorAdapter {   
    private int openingTime;   
    private int closingTime;   
    private String mappingURL;//利用正则映射到需要拦截的路径   
    public void setOpeningTime(int openingTime) {   
        this.openingTime = openingTime;   
    }   
    public void setClosingTime(int closingTime) {   
        this.closingTime = closingTime;   
    }   
    public void setMappingURL(String mappingURL) {   
        this.mappingURL = mappingURL;   
    }   
    @Override  
    public boolean preHandle(HttpServletRequest request,   
            HttpServletResponse response, Object handler) throws Exception {   
        String url=request.getRequestURL().toString();   
        if(mappingURL==null || url.matches(mappingURL)){   
            Calendar c=Calendar.getInstance();   
            c.setTime(new Date());   
            int now=c.get(Calendar.HOUR_OF_DAY);   
            if(now<openingTime || now>closingTime){   
                request.setAttribute("msg", "注册开放时间：9：00-12：00");   
                request.getRequestDispatcher("/msg.jsp").forward(request, response);   
                return false;   
            }   
            return true;   
        }   
        return true;   
    }   
} 

<bean id="timeBasedAccessInterceptor" class="com.spring.handler.TimeBasedAccessInterceptor">  
    <property name="openingTime" value="9" />  
    <property name="closingTime" value="12" />  
    <property name="mappingURL" value=".*/user\.do\?action=reg.*" />  
</bean>  
<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping">  
    <property name="interceptors">  
        <list>  
            <ref bean="timeBasedAccessInterceptor"/>  
        </list>  
    </property>  
</bean> 

简单的配置拦截器的方法：

<mvc:interceptors>
		<bean class="com.spring.handler.TimeBasedAccessInterceptor" />
	</mvc:interceptors>