StringMVC做登录拦截

 

 

StringMVC做登录拦截

1：拦截类

package cn.sjt.ums.interceptor;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.HandlerInterceptor;

import org.springframework.web.servlet.ModelAndView;

public class LoginInterceptor implements HandlerInterceptor{

@Override

public void afterCompletion(HttpServletRequest request,

HttpServletResponse response, Object obj, Exception err)

throws Exception {

}

@Override

public void postHandle(HttpServletRequest request, HttpServletResponse response,

Object obj, ModelAndView mav) throws Exception {

}

 

@Override

public boolean preHandle(HttpServletRequest request, HttpServletResponse response,

Object obj) throws Exception {

        // 从session 里面获取用户ID

        String userId = (String) request.getSession().getAttribute("userid");  

        // 判断如果没有取到用户ID，就跳转到登陆页面，提示用户进行登陆  

        if (userId == null || "".equals(userId)) {

            response.sendRedirect("/login");

            return false;

        }

        return true;

}

}

2：applicationContext-springmvc.xml的配置

<!-- 端口后加"/"，跳转至登录页 -->

<mvc:view-controller path="/" view-name="redirect:/login" /> 

    <mvc:interceptors>  

        <mvc:interceptor>  

            <mvc:mapping path="/**" /> 

             

        <!-- 不需要拦截的配置 -->

            <mvc:exclude-mapping path="/"/>

            <mvc:exclude-mapping path="/login" />

            <mvc:exclude-mapping path="/captcha-image" />

            <mvc:exclude-mapping path="/user/inneruser/login" />

            <mvc:exclude-mapping path="/css/**" />

          <mvc:exclude-mapping path="/images/**" /> 

          <mvc:exclude-mapping path="/js/**"/>   

            <bean class="cn.sjt.ums.interceptor.LoginInterceptor"/>  

        </mvc:interceptor>  

    </mvc:interceptors>