Java 如何在 Spring Boot 中注册 ServletContextListener
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How to register ServletContextListener in spring boot
提问by bilak
Hello I'm trying to rewrite my old code to use Spring Boot.
I have one listener public class ExecutorListener implements ServletContextListener.
您好，我正在尝试重写我的旧代码以使用 Spring Boot。我有一个听众public class ExecutorListener implements ServletContextListener。
How can I register this listener for Spring Boot? I've tried:
如何为 Spring Boot 注册此侦听器？我试过了：
@SpringBootApplication
@ComponentScan
public class Application extends SpringBootServletInitializer {
@Override
public void onStartup(ServletContext servletContext) throws ServletException {
super.onStartup(servletContext);
servletContext.addListener(new ExecutorListener());
}
}
But the contextInitializedmethod is not called.
但是contextInitialized没有调用该方法。
采纳答案by jny
You can try couple of things:
Register ExecutorListeneras a @Beanexplicitly:
您可以尝试几件事：明确注册ExecutorListener为@Bean：
@Bean
public ExecutorListener executorListener() {
return new ExecutorListener();
}
or
或者
You can try it with explicitly creating ServletRegistrationBean:
您可以通过显式创建 ServletRegistrationBean 来尝试：
@Bean
public DispatcherServlet dispatcherServlet() {
DispatcherServlet servlet=new DispatcherServlet();
servlet.getServletContext().addListener(new ExecutorListener());
return servlet;
}
@Bean
public ServletRegistrationBean dispatcherServletRegistration() {
ServletRegistrationBean registrationBean = new ServletRegistrationBean(dispatcherServlet(), "/rest/v1/*");
registrationBean
.setName(DispatcherServletAutoConfiguration.DEFAULT_DISPATCHER_SERVLET_REGISTRATION_BEAN_NAME);
return registrationBean;
}
回答by Tom Bunting
If using an embedded container, there will soon be a third option if using SpringBoot 1.3.0+
Annotate your ServletContextListenerimplementation with @WebListenerfrom servlet spec 3, then annotate one of your Spring @Configurationclasses with the new @ServletComponentScan(and optionally tell it which packages to scan for filters, servlets and listeners).
如果使用嵌入式容器，很快就会有第三个选项，如果使用 SpringBoot 1.3.0+ 使用servlet 规范 3注释您的ServletContextListener实现@WebListener，然后使用@Configuration新的注释您的 Spring类之一@ServletComponentScan（并可选择告诉它哪些包要扫描过滤器、servlet 和侦听器）。
Only available in 1.3.0+ at the moment though: http://docs.spring.io/spring-boot/docs/current/api/org/springframework/boot/web/servlet/ServletComponentScan.html
目前仅在 1.3.0+ 中可用：http://docs.spring.io/spring-boot/docs/current/api/org/springframework/boot/web/servlet/ServletComponentScan.html
文档：http: //docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-embedded-container-servlets-filters-listeners
回答by buer
In case you prefer auto discovery using annotations only, make your ExecutorListenerimplement the ServletContextInitializerand e.g. annotate it with javax.annotation.ManagedBean. From there, just implement the onStartupmethod:
如果你只喜欢自动发现使用注释，使您ExecutorListener实现ServletContextInitializer与和如对其进行批注javax.annotation.ManagedBean。从那里，只需实现该onStartup方法：
@ManagedBean
public final class ExecutorListener implements ServletContextInitializer {
...
@Override
public void onStartup(ServletContext servletContext) throws ServletException {
...
}
}
