Java类如何获取Spring的Bean
1.创建一个类并让其实现org.springframework.context.ApplicationContextAware接口来让Spring在启动的时候为我们注入ApplicationContext对象.
示例代码:
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? view?plaincopy?to?clipboardprint?
import?org.springframework.beans.BeansException;
import?org.springframework.context.ApplicationContext;
import?org.springframework.context.ApplicationContextAware;
public?class?MyApplicationContextUtil?implements?ApplicationContextAware?{
private?static?ApplicationContext?context;//声明一个静态变量保存
@Override
public?void?setApplicationContext(ApplicationContext?contex)
throws?BeansException?{
this.context=contex;
}
public?static?ApplicationContext?getContext(){
return?context;
}
2.在applicationContext.xml文件中配置此bean,以便让Spring启动时自动为我们注入ApplicationContext对象.
例:
?
? <!--?这个bean主要是为了得到ApplicationContext?所以它不需要其它属性-->?
<bean?class="org.ing.springutil.MyApplicationContextUtil"></bean>
3.有了这个ApplicationContext之后我们就可以调用其getBean("beanName")方法来得到由Spring 管理所有对象.
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4.在java中获得applicationContext引用:
import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
?
public class ApplicationListener implements ServletContextListener {
?private static final Log log = LogFactory.getLog(ApplicationListener.class);
?public void contextDestroyed(ServletContextEvent arg0) {
???
?}
?
?public void contextInitialized(ServletContextEvent evt) {
??System.setProperty("user.timezone", "GMT+0800");// 服务器的时区应该是可以配置的
//??TimeZone.setDefault(TimeZone.getTimeZone("GMT+0800"));?//这个真TMD奇怪
??ServletContext sc = evt.getServletContext();
???
??//获取spring上下文
??ServletContext context = evt.getServletContext();
??ApplicationContext ctx = WebApplicationContextUtils.getWebApplicationContext(context);
??System.out.println("在这里向java类中传递ctx参数,可以在这里初始化,启动别的服务");
???
??evt.getServletContext().setAttribute("test",2);
??
???}
?}
?
在web.xml中配置如下:
<listener>
??<listener-class>
???com.listener.ApplicationListener
??</listener-class>
?</listener>