SpringBoot 拦截器学习
阅读《Java EE 开发的颠覆者 Spring Boot 实战》时，在 第二部分->第四章 SpringMVC 基础 中介绍到拦截器的使用，这里介绍拦截器的配置可让普通Bean 实现HandlerInterceptor 接口或者继承HandlerInterceptorAdapter 类来实现自定义拦截器. 因为抽象类HandlerInterceptorAdapter 会多提供一个afterConcurrentHandlingStarted 方法,所以我们先根据继承HandlerInterceptorAdapter 的自定义拦截器类进行深入研究.这里我们先将相关的源码看一看. HandlerInterceptorAdapter package org.springframework.web.servlet.handler; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.lang.Nullable; import org.springframework.web.servlet.AsyncHandlerInterceptor; import org.springframework.web.servlet.ModelAndView; public abstract class HandlerInterceptorAdapter implements AsyncHandlerInterceptor { public HandlerInterceptorAdapter() { } public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { return true; } public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable ModelAndView modelAndView) throws Exception { } public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable Exception ex) throws Exception { } public void afterConcurrentHandlingStarted(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { } } AsyncHandlerInterceptor...