springmvc配置拦截器

1.在springmvc的配置文件中

    <!-- 配置拦截器 -->
    <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/back/manager/**"/>
            <mvc:mapping path="/dev/flatform/**"/>
            <bean class="cn.appsys.interceptor.LoginInterceptor"/>
        </mvc:interceptor>
    </mvc:interceptors>

2.编写拦截器Java代码

public class LoginInterceptor extends HandlerInterceptorAdapter {
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        HttpSession session = request.getSession();
        BackendUser backendUser = (BackendUser) session.getAttribute(Constants.USER_SESSION);
        DevUser devUser = (DevUser) session.getAttribute(Constants.DEV_USER_SESSION);
        if (null != devUser) {
            return true;
        } else if (null != backendUser) {
            return true;
        } else {
            response.sendRedirect(request.getContextPath() + "/403.jsp");
            return false;
        }
    }
}