springmvc拦截器的配置
登陆认证拦截实现
代码实现
1 @Controller 2 public class LoginController { 3 @RequestMapping("/login") 4 public String login(HttpSession session,String username,String password) throws Exception { 5 6 session.setAttribute("username", username); 7 return "redirect:items/queryItems.action"; 8 } 9 10 @RequestMapping("/logout") 11 public String logout(HttpSession session) throws Exception { 12 session.invalidate(); 13 return "redirect:/items/queryItems.action"; 14 } 15 }
LoginInterceptor.java
1 public class LoginInterceptor implements HandlerInterceptor { 2 3 //在进入handler方法之前执行 4 //用于身份认证，身份授权 认认证不通过，拦截，不再向下执行 5 public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { 6 7 String url = request.getRequestURI(); 8 //判断url是否是公开地址 在这里就是登录提交的地址 9 if(url.indexOf("login.action") >= 0){ 10 //放行 11 return true; 12 } 13 14 HttpSession session = request.getSession(); 15 String username = (String) session.getAttribute("username"); 16 if(username != null){ 17 return true; 18 } 19 //失败，跳转登录页面 20 request.getRequestDispatcher("/WEB-INF/jsp/login.jsp").forward(request, response); 21 //false表示拦截 true表示放行 22 return false; 23 } 24 25 //进入handler方法之后，返回modelandview之前执行 26 //将公用的模型数据传到视图，也可以在这里统一视图 27 public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) 28 throws Exception { 29 System.out.println("Interceptor......postHandle"); 30 } 31 32 //执行完handler方法之后执行 33 //使用统一的异常处理，统一的日志处理 34 public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) 35 throws Exception { 36 System.out.println("Interceptor......afterCompletion"); 37 } 38 39 }
拦截器配置
1 <!--拦截器 --> 2 <mvc:interceptors> 3 <!--多个拦截器,顺序执行 --> 4 <!-- 登陆认证拦截器 --> 5 <mvc:interceptor> 6 <mvc:mapping path="/**"/> 7 <bean class="cn.cuibusi.ssm.interceptor.LoginInterceptor"></bean> 8 </mvc:interceptor> 9 </mvc:interceptors>
