只需定义多个拦截器的 bean，然后在拦截器的配置类中将其逐一添加即可
第一个拦截器的定义：
@Component
public class ProjectInterceptor1 implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println("preHandle111...");
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("postHandle111...");
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
System.out.println("afterCompletion111...");
}
}第二个拦截器的定义：
@Component
public class ProjectInterceptor2 implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println("preHandle222...");
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("postHandle222...");
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
System.out.println("afterCompletion222...");
}
}
拦截器配置类：
@Configuration
public class SpringMvcSupport extends WebMvcConfigurationSupport {
@Autowired
private ProjectInterceptor1 interceptor1;
@Autowired
private ProjectInterceptor2 interceptor2;
@Override
protected void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(interceptor1).addPathPatterns("/books", "/books/*");
registry.addInterceptor(interceptor2).addPathPatterns("/books", "/books/*");
}
}
拦截器配置类中，首先被添加的拦截器在外层，之后添加的在内层，请求发出之后首先被外层的拦截器拦截，外层放行后进入内层，而离开拦截器时先离开内层的拦截器，再离开外层。
上例子中第一个拦截器在外层，第二个在内层，所以上例中拦截器的输出顺序为：
preHandle111...
preHandle222...
postHandle222...
postHandle111...
afterCompletion222...
afterCompletion111...
值得注意的是，afterCompletion 方法的一定会在 postHandle 之后执行，并且也是由内层向外层执行，所以 afterCompletion222 输出在 postHandle111 之后，而在 afterCompletion111 之前。换言之，即便有再多的拦截器，最先执行的 afterCompletion 也一定在最后执行的 postHandle 之后才执行
此外，当拦截器的 preHandle 方法返回 false 时，其内层的拦截器以及它自身 postHandle 和 afterCompletion 都不会再执行，而所有外层拦截器的 postHandle 不再执行，但 afterCompletion 照常执行
这是因为 postHandle 执行在原始 Controller 方法执行之后，必须所有拦截器都放行时，才会执行原始方法，也就才会执行 postHandle 方法
上例中第二个拦截器 preHandle 返回 false 时的输出顺序：
preHandle111...
preHandle222...
afterCompletion111...
