Spring MVC 登录拦截器

1.编写拦截器

package interceptor;import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;/*** @Description 登录拦截器* @Author zhaohuaqing*/
public class LoginInterceptor implements HandlerInterceptor {@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws IOException {HttpSession session = request.getSession();Object username = session.getAttribute("username");String path = request.getServletPath();//不需要过滤的urlString[] urls = {"/login","/logOut","/index","/json",".js",".css",".ico",".jpg",".png"};// flag是登录成功标志boolean flag = false;for (String url : urls) {if (path.endsWith(url) && !path.endsWith(".jsp") || path.endsWith("login.jsp")){flag = true;break;}}if (!flag){if (username != null) {return true;}else {response.sendRedirect("/index");return false;}}else {return true;}}@Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) {}@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex){}
}

2.Spring MVC 配置

<!-- 登录拦截器--><mvc:interceptors><mvc:interceptor><mvc:mapping path="/**"/><bean class="com.interceptor.LoginInterceptor" /></mvc:interceptor></mvc:interceptors>