spring获取bean实例

在web项目中获取springbean，有时候我们需要在非spring组件中获取springbean，我们如果希望在我们的项目中任何位置都能拿到同一个ApplicationContext来获取IOC容器中的资源，就要让Spring将上下文环境填充到我们能获取的地方

最简单的方案就是自己写一个SpringContextUtil来获取。

代码如下：

public class SpringContextUtil implements ApplicationContextAware {
private static final Logger logger = LoggerFactory.getLogger(SpringContextUtil.class);

private static ApplicationContext context = null;

/*
* @Title: setApplicationContext
* @Description: spring获取bean工具类
* @param applicationContext
* @throws BeansException
* @see org.springframework.context.ApplicationContextAware#setApplicationContext(org.springframework.context.ApplicationContext)
*/
@Override
public void setApplicationContext(ApplicationContext applicationContext)
throws BeansException {
SpringContextUtil.context = applicationContext;
}
@SuppressWarnings("unchecked")
public static <T> T getBean(String beanName) {
return (T) SpringContextUtil.context.getBean(beanName);
}
public static String getMessage(String key) {
return context.getMessage(key, null, Locale.getDefault());
}
}

有一个quartz任务需要执行，它是在spring组件之外的，代码如下：

public class VisitorWriteTask extends QuartzJobBean {

private static final Logger logger = LoggerFactory.getLogger(VisitorWriteTask.class);

@Override
protected void executeInternal(JobExecutionContext jobExecutionContext) throws JobExecutionException {
this.work();
}

public void work() {
try {
logger.info("VisitorWriteTask is start");
VisitorService visitorService = SpringContextUtil.getBean("visitorService");
visitorService.writeVisitor();
logger.info("VisitorWriteTask is end");
} catch (Exception e) {
logger.error(e.getMessage());
}
}
}

这样通过直接

SpringContextUtil.getBean("visitorService")

就可以获得visitorService这个实例bean。