springboot中的拦截器配置
自定义拦截器,一般在主启动类的包下创建interceptor包,在该包中创建拦截器
示例:登录拦截器
public class LoginInterceptor implements HandlerInterceptor {
@Override
// Controller方法处理之前【也就是路径跳转之前】
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
Object user = request.getSession().getAttribute("user");
if (user == null){
response.sendRedirect("/login.html");
return false;
}
return true;
}
@Override
// Controller方法处理完之后,DispatcherServlet进行视图的渲染之前,也就是说在这个方法中你可以对ModelAndView进行操作
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
}
@Override
// DispatcherServlet进行视图的渲染之后
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
}
}
注册拦截器,配置拦截器拦截和不拦截的地址等信息
一般在主启动类包下创建配置包,在包中创建配置类
@Configuration //声明是一个配置类
public class LoginConfig implements WebMvcConfigurer {
// 实现 WebMvcConfigurer
// 重写 addInterceptors 方法
@Override
public void addInterceptors(InterceptorRegistry registry) {
// 调用addInterceptor方法,参数为拦截器,
// addPathPatterns--表示拦截的路径
// excludePathPatterns--表示不拦截的路径
registry.addInterceptor(new LoginInterceptor())
.addPathPatterns("/**").excludePathPatterns("/login.html","/checkLogin");
}
}
自定义配置视图控制器
//springboot默认不支持jsp,而是使用模板引擎thymeleaf作为视图
//引入thymeleaf
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
//配置视图控制器
@Configuration
public class MyConfig implements WebMvcConfigurer {
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(new MyIntercepter()).addPathPatterns("/**").excludePathPatterns("/","/index.html","/user/login");
}
//配置视图控制器
@Override
public void addViewControllers(ViewControllerRegistry registry) {
registry.addViewController("/main").setViewName("main");
}
}
如图:
registry.addViewController(“/main”).setViewName(“main”);
}
}
如图:
![在这里插入图片描述](https://img-blog.csdnimg.cn/d9351cc2f80a49d3b85b7371c1d3fc92.png)