package org.myframework.util;

import javax.servlet.ServletContext;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.springframework.context.ApplicationContext;

import org.springframework.context.ConfigurableApplicationContext;

import org.springframework.util.ClassUtils;

import org.springframework.web.context.WebApplicationContext;

import org.springframework.web.context.support.WebApplicationContextUtils;

/**

* 完成SPRING 的BEAN获取和 SPRING 容器的刷新

* @author Administrator

*

*/

public class SpringUtil {

private static Log log = LogFactory.getLog(SpringUtil.class);

/**

* 取得SpringBean实例

* @param request

* @param beanId

* @return

*/

public static Object getBean(HttpServletRequest request, String beanId) {

return getWebApplicationContext(request).getBean(beanId);

}

/**

* 刷新WEB中SPRING的信息

* @param request

*/

public static void refreshSpring(HttpServletRequest request) {

WebApplicationContext wac = getWebApplicationContext(request);

refreshSpring(wac);

}

/**

* 刷新SPRING的信息

* @param aContext

*/

public static void refreshSpring(ApplicationContext aContext) {

Class[] cls = ClassUtils.getAllInterfaces(aContext);

for (Class item : cls) {

if (ConfigurableApplicationContext.class.getName().equals(

item.getName())) {

log.debug("refresh Spring start ");

long start = System.currentTimeMillis();

((ConfigurableApplicationContext) aContext).refresh();

log.debug("refresh Spring end ; cost time (ms) :"

+ (System.currentTimeMillis() - start));

}

}

}

/**

* 取得WebApplicationContext

* @param sc

* @return

*/

public static WebApplicationContext getWebApplicationContext(

ServletContext sc) {

// 通过web.xml 配置 org.springframework.web.context.ContextLoaderListener 加载。

WebApplicationContext ctx = WebApplicationContextUtils

.getRequiredWebApplicationContext(sc);

if (ctx == null) {

throw new RuntimeException(

"WebApplicationContext error ........ Can't find [WebApplicationContext] in any scope !");

}

return ctx;

}

/**

* 取得WebApplicationContext

* @param request

* @return

*/

public static WebApplicationContext getWebApplicationContext(

HttpServletRequest request) {

ServletContext sc = request.getSession().getServletContext();

return getWebApplicationContext(sc);

}

}