步骤如下

1. 编写拦截器的类
2. 在springmvc配置文件中配置拦截器的类

步骤一：编写拦截器的类

public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
        // 如果用户没有登录成功，则跳转到登录页面
        HttpSession session = httpServletRequest.getSession();
        User user = (User) session.getAttribute(Contans.SESSION_USER);
        if (user == null){
            // 重定向时，url必须加项目的名称
            httpServletResponse.sendRedirect(httpServletRequest.getContextPath());
            return false;
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {

    }
}

步骤二：在SpringMVC配置文件中配置拦截器

<!-- 配置拦截器 -->
        <mvc:interceptors>
            <mvc:interceptor>
                <!-- 配置拦截的请求，要拦截的类 -->
                <mvc:mapping path="/settings/**"/>
                <mvc:mapping path="/workbecnch/**"/>
                <!-- 配置排除拦截的请求(优先级高) 放行的controller url地址-->
                <mvc:exclude-mapping path="/settings/qx/user/toLogin.do"/>
                <mvc:exclude-mapping path="/settings/qx/user/login.do"/>
                <!-- 配置拦截器的类 -->
                <bean class="com.bjpowernode.crm.settings.web.interceptor.LoginInterceptor"></bean>
            </mvc:interceptor>
        </mvc:interceptors>

最后

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