spring ContextLoaderListener.java

该类为spring的启动监听器，必须在web.xml进行配置改监听器，默认加载WEB-INF/applicationContext1.xml配置文件，当然可以通过配置制定配置文件名称，例如WEB-INF/*Context.xml,WEB-INF/spring*.xml" or "WEB-INF/**/*Context.xml均可，如果没有指定，默认加载/WEB-INF/applicationContext.xml。

这些工作主要通过ContextLoader.java类，即环境资源加载类，主要进行spring启动的初始化工作

 

package org.springframework.web.context;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

/**
 * Bootstrap listener to start up Spring's root {@link WebApplicationContext}.
 * Simply delegates to {@link ContextLoader}.
 *
 * <p>This listener should be registered after
 * {@link org.springframework.web.util.Log4jConfigListener}
 * in <code>web.xml</code>, if the latter is used.
 *
 * @author Juergen Hoeller
 * @since 17.02.2003
 * @see ContextLoaderServlet
 * @see org.springframework.web.util.Log4jConfigListener
 */
public class ContextLoaderListener implements ServletContextListener {

 private ContextLoader contextLoader;

 /**
  * Initialize the root web application context.
  */
 public void contextInitialized(ServletContextEvent event) {
  this.contextLoader = createContextLoader();
  this.contextLoader.initWebApplicationContext(event.getServletContext());
 }

 /**
  * Create the ContextLoader to use. Can be overridden in subclasses.
  * @return the new ContextLoader
  */
 protected ContextLoader createContextLoader() {
  return new ContextLoader();
 }

 /**
  * Return the ContextLoader used by this listener.
  * @return the current ContextLoader
  */
 public ContextLoader getContextLoader() {
  return this.contextLoader;
 }

 /**
  * Close the root web application context.
  */
 public void contextDestroyed(ServletContextEvent event) {
  if (this.contextLoader != null) {
   this.contextLoader.closeWebApplicationContext(event.getServletContext());
  }
 }

}