/**
*
*/
package com.plf.context;
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
/**
* Context上下文监听器
*
* @author PLF
* @date 2019年2月18日
*
*/
public class ContextLoaderListener implements ServletContextListener{
private WebApplicationContext context;
public static final String ROOT_CXT_ATTR = "ROOT_CXT";
/**
* context初始化.
*/
@Override
public void contextInitialized(ServletContextEvent event) {
System.out.println("contextInitialized");
ServletContext servletContext = event.getServletContext();
if (null == this.context) {
//配置的application文件路径
String cfgFile = servletContext.getInitParameter("contextConfigLocation");
this.context = new WebApplicationContext(cfgFile);
//存入上下文，后面servlet会取用
servletContext.setAttribute(ROOT_CXT_ATTR, this.context);
}
//源码中是在这里初始化context，调用refresh方法的，我们在上面new的时候先做了
// initWebApplicationContext(this.context);
}
/**
* context销毁
*
* @param arg0
*/
@Override
public void contextDestroyed(ServletContextEvent arg0) {
System.out.println("contextDestroyed");
context = null;
}
}
