未登录，不允许访问项目文件夹内的页面，那如何判断是否登录呢？
下面向大家详细介绍spring mvc Session拦截器的使用，本文以登录为例，未登录无权限访问项目内页面，session为空时返回项目首页。
代码如下：
package com.sundear.sundearemm.interceptor;
import com.sundear.sundearemm.model.User;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
/**
*
* @author yh
*/
public class SessionInterceptor implements HandlerInterceptor {
private Logger logger = Logger.getLogger(SessionInterceptor.class.getName());
@Override
public boolean preHandle(HttpServletRequest hsr, HttpServletResponse hsr1, Object o) throws Exception {
User user=(User) hsr.getSession().getAttribute("LoginUser");
if(user==null){
logger.log(Level.INFO, "user not login");
hsr1.sendRedirect("/SundearEmm");
return false;
}
return true;
}
@Override
public void postHandle(HttpServletRequest hsr, HttpServletResponse hsr1, Object o, ModelAndView mav) throws Exception {
}
@Override
public void afterCompletion(HttpServletRequest hsr, HttpServletResponse hsr1, Object o, Exception excptn) throws Exception {
}
}
package com.sundear.sundearemm.interceptor;
import com.sundear.sundearemm.model.User;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
/**
*
* @author yh
*/
public class SessionInterceptor implements HandlerInterceptor {
private Logger logger = Logger.getLogger(SessionInterceptor.class.getName());
@Override
public boolean preHandle(HttpServletRequest hsr, HttpServletResponse hsr1, Object o) throws Exception {
User user=(User) hsr.getSession().getAttribute("LoginUser");
if(user==null){
logger.log(Level.INFO, "user not login");
hsr1.sendRedirect("/SundearEmm");
return false;
}
return true;
}
@Override
public void postHandle(HttpServletRequest hsr, HttpServletResponse hsr1, Object o, ModelAndView mav) throws Exception {
}
@Override
public void afterCompletion(HttpServletRequest hsr, HttpServletResponse hsr1, Object o, Exception excptn) throws Exception {
}
}
仅这些还不够，我们还需要修改spring mvc的配置文件dispatcher-servlet.xml,加入拦截器代码如下：
<!-- interceptors --> <mvc:interceptors > <mvc:interceptor> <mvc:mapping path="/group/*" /> <mvc:mapping path="/user/*"/> <mvc:mapping path="/subscribe/*"/> <mvc:mapping path="/recipient/*"/> <mvc:mapping path="/mail/*"/> <bean class="com.sundear.sundearemm.interceptor.SessionInterceptor"></bean> </mvc:interceptor> </mvc:interceptors> <!-- interceptors --> <mvc:interceptors > <mvc:interceptor> <mvc:mapping path="/group/*" /> <mvc:mapping path="/user/*"/> <mvc:mapping path="/subscribe/*"/> <mvc:mapping path="/recipient/*"/> <mvc:mapping path="/mail/*"/> <bean class="com.sundear.sundearemm.interceptor.SessionInterceptor"></bean> </mvc:interceptor> </mvc:interceptors>
如有访客不明白的可以给我留言，我会给大家满意的解决方法……