Spring之ContextLoaderListener

悠悠 2022-03-21 07:39 261阅读 0赞

## Spring 官方文档 ##

*  [Spring Framework Documentation【Version 5.1.4.RELEASE】][Spring Framework Documentation_Version 5.1.4.RELEASE]
 *  [ContextLoaderListener API Doc][]

## 介绍 ##

> web.xml中配置ContextLoaderListener，可以实例化ApplicationContext

You can register an ApplicationContext by using the ContextLoaderListener, as the following example shows:

<context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/daoContext.xml /WEB-INF/applicationContext.xml</param-value>
    </context-param>
    
    
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

## 源码 ##

package org.springframework.web.context;
    
    import javax.servlet.ServletContextEvent;
    import javax.servlet.ServletContextListener;
    
    public class ContextLoaderListener extends ContextLoader implements ServletContextListener { 
    	public ContextLoaderListener() { 
    	}
    	public ContextLoaderListener(WebApplicationContext context) { 
    		super(context);
    	}
    	@Override
    	public void contextInitialized(ServletContextEvent event) { 
    		initWebApplicationContext(event.getServletContext());
    	}
    	@Override
    	public void contextDestroyed(ServletContextEvent event) { 
    		closeWebApplicationContext(event.getServletContext());
    		ContextCleanupListener.cleanupAttributes(event.getServletContext());
    	}
    
    }

[Spring Framework Documentation_Version 5.1.4.RELEASE]: https://docs.spring.io/spring/docs/5.1.4.RELEASE/spring-framework-reference
[ContextLoaderListener API Doc]: https://docs.spring.io/spring-framework/docs/5.1.4.RELEASE/javadoc-api/org/springframework/web/context/ContextLoaderListener.html