使用springmvc中的intercepter进行页面的拦截,拦截除了登录界面的所有页面,当用户登录过后产生保存用户信息的session。在拦截器通过判断session进行页面跳转。
1.登录页面html
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form th:action="@{/}">
<input type="text" name="username">用户名
<br>
<input type="password" name="password">密码
<input type="submit" value="登录">
<br>
<p style="color:red;" th:text="${msg}"></p>
</form>
</body>
</html>
2.在自动配置类中配置需要拦截的页面和请求映射
@Configuration
public class MvcConfig implements WebMvcConfigurer {
@Bean
public WebMvcConfigurer webMvcConfigurer(){
return new WebMvcConfigurer(){
@Override
public void addInterceptors(InterceptorRegistry registry) {
InterceptorRegistration interceptorRegistration = registry.addInterceptor(new InterceptLogin());
/*拦截除了/ 和/index.html之外的全部请求*/
interceptorRegistration.addPathPatterns("/**");
interceptorRegistration.excludePathPatterns("/","/index.html");
}
@Override
public void addViewControllers(ViewControllerRegistry registry) {
registry.addViewController("/index.html").setViewName("index");
}
};
}
}
3.拦截请求
public class InterceptLogin implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
HttpSession session = request.getSession();
/*获取用户信息*/
Object user = session.getAttribute("user");
/*如果用户信息为空跳转到登录页面*/
if(user==null){
request.setAttribute("msg","请重新登录");
request.getRequestDispatcher("index.html").forward(request, response);
return false;
}
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
}
}
4.业务逻辑层
@Controller
public class UserController {
@RequestMapping("/")
public String userLogin(User user,HttpSession session){
User user1 = (User) session.getAttribute("user");
/*如果信息从登陆页面传入,session中存入用户信息*/
if(user.getUsername()!=null){
session.setAttribute("user", user);
return "redirect:/user";
}
if(user1!=null){
return "redirect:/user";
}
return "index";
}
@ResponseBody
@RequestMapping("user")
public String user(HttpSession session){
User user = (User) session.getAttribute("user");
return user.toString();
}
}
user
public class User {
private String username;
private String password;
getter..setter....
}
5.效果图
直接访问其他的url
用户登录后
