springboot 拦截器实现的具体步骤 淡淡的烟草味﹌ 2022-06-01 04:59 166阅读 0赞 拦截器的功能是拦截action请求,底层通过反射机制实现。 具体步骤: (1)先写一个拦截器,实现HandlerInterceptor。拦截逻辑写在方法preHandle 里面,如果让通过 return true,否则return false。postHandle 是完成action请求后回到这个方法里面,这个时候还没渲染页面(没有展示页面)。afterCompletion 是渲染页面后执行的方法。 public class FirstInterceptor implements HandlerInterceptor { @Override public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception { System.out.println("11########## FirstInterceptor 前前前前前前前前前前前前前前前前前前前前"); return true; } @Override public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception { System.out.println("11########## FirstInterceptor 后后后后后后后后后后后后后后后后后后"); } @Override public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception { System.out.println("11########## FirstInterceptor over over over over"); } } (2)写一个配置类,加载拦截器。 @Configuration public class SessionConfiguration extends WebMvcConfigurerAdapter{ @Override public void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(new FirstInterceptor()).addPathPatterns("/**");//拦截所有请求 super.addInterceptors(registry); } } 完成了。 在拦截器的的preHandle return true 情况下,会如下图执行(return false 的情况下,会立即断掉,不往下执行,且无东西返回浏览器)。这个拦截器的顺序由配置类的registry.addInterceptor 先后顺序确定,先add的拦截器会越靠外,即越靠近浏览器。 ![SouthEast][] [SouthEast]: /images/20220601/26990a245b144e6a97a1b92913197fc4.png
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