Spring Boot-定义拦截器(七)

 在web项目 我们常常使用拦截器做权限验证和登陆验证 

1.创建一个拦截器实现类 标注@Componet

@Component
public class LoginInterceputer implements HandlerInterceptor {
    /**
     * 进入controller层之前拦截请求
     * @param httpServletRequest
     * @param httpServletResponse
     * @param o 为函数对象
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {

        System.out.println(o);
        System.out.println("进入controller之前拦截");
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
        System.out.println("--------------处理请求完成后视图渲染之前的处理操作---------------");
    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
        System.out.println("---------------视图渲染之后的操作-------------------------0");
    }

}

2.通过javaconfig的方式进行拦截器配置

@Configuration
public class WebConfig implements WebMvcConfigurer {
    @Autowired
    LoginInterceputer loginInterceputer;
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // 自定义拦截器，添加拦截路径和排除拦截路径
        registry.addInterceptor(loginInterceputer).addPathPatterns(new String[]{"/**"}).excludePathPatterns(new String[]{"/login"});
    }
}