SpringMvc 拦截器

<mvc:interceptors> 
<mvc:interceptor> 
  <mvc:mapping path=”拦截的路径，可用正则表达式”/>
<bean class=”自定义拦截器实现类”></bean>
</mvc:interceptor>
</mvc:interceptors>

<!-- 解决spring post 中文乱码 -->
<filter>  
        <filter-name>characterEncodingFilter</filter-name>  
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>  
        <init-param>  
            <param-name>encoding</param-name>  
            <param-value>UTF-8</param-value>  
        </init-param>  
        <init-param>  
            <param-name>forceEncoding</param-name>  
            <param-value>true</param-value>  
        </init-param>  
    </filter>  
    <filter-mapping>  
        <filter-name>characterEncodingFilter</filter-name>  
        <url-pattern>/*</url-pattern>  
    </filter-mapping>  

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