spring获取bean实例

雨翔河

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spring获取bean实例

2016-12-29 14:12

>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。

类型：工作标签：spring,java