spring 获取bean的几种方法

实现BeanFactoryAware

public class ServiceLocator implements BeanFactoryAware {

private static BeanFactory beanFactory;@Overridepublic void setBeanFactory(BeanFactory beanFactory) throws BeansException {ServiceLocator.beanFactory = beanFactory;}/** * 根据提供的bean名称得到相应的服务类 *  * @param servName * bean名称 */public static Object getService(String servName) {return beanFactory.getBean(servName);}}

spring配置文件

<bean id="serviceLocator" class="com.taobao.appcenter.common.ServiceLocator" lazy-init="false"/>

实现applicationContextAware

public class SpringContextsUtil implements ApplicationContextAware {private static ApplicationContext applicationContext;    //Spring context   @Overridepublic void setApplicationContext(ApplicationContext applicationContext) throws BeansException {SpringContextsUtil.applicationContext = applicationContext;}/**  * @return ApplicationContext  */  public static ApplicationContext getApplicationContext() {    return applicationContext;  }  /**  * 获取对象    * @param name  * @return Object 一个以所给名字注册的bean的实例  * @throws BeansException  */  public static Object getBean(String name) throws BeansException {    return applicationContext.getBean(name);  }}

spring xml配置文件

<bean id="springContext" class="com.taobao.appcenter.common.SpringContext" lazy-init="false"/>

通过servlet 或listener设置spring的ApplicationContext,以便后来引用,这个是针对web 工程的

public class SpringContext {private static ApplicationContext applicationContext; // Spring应用上下文环境public static void setApplicationContext(ApplicationContext applicationContext) throws BeansException {SpringContext.applicationContext = applicationContext;}/** * @return ApplicationContext */public static ApplicationContext getApplicationContext() {return applicationContext;}public static Object getBean(String name) throws BeansException {return applicationContext.getBean(name);}}

上面的SpingContext谁没实现任何接口的，不是回调的方式。而是在listener或者servlet中set进来

public class SpringContextLoaderListener extends ContextLoaderListener {public void contextInitialized(ServletContextEvent event){super.contextInitialized(event);SpringContext.setApplicationContext(WebApplicationContextUtils.getWebApplicationContext(event.getServletContext()));}}

替换web.xml文件的listener为上面的文件

<listener><listener-class>com.taobao.appcenter.common.SpringContextLoaderListener</listener-class></listener>

servlet的代码如下

public class SpringContextLoaderServlet extends ContextLoaderServlet { private ContextLoader contextLoader;    public void init() throws ServletException {        this.contextLoader = createContextLoader();        SpringContext.setApplicationContext(this.contextLoader.initWebApplicationContext(getServletContext()));    }}

调用

由于使用的都是静态函数,使用getBean(Stirng name)或者getService(String serviceName)就可以获得xml配置的业务自己bean。