手动关闭Spring容器

    Spring应用在web系统中，如果web服务停止，servlet容器会触发关闭事件并通知ContextLoaderListener，ContextLoaderListener中contextDestroyed方法调用closeWebApplicationContext(event.getServletContext())销毁Spring容器；但对于非web应用项目，则需要手动去关闭Spring；

    不过手动关闭Spring容器也很容易，Spring中ApplicationContext实现类大都继承AbstractApplicationContext，而AbstractApplicationContext中定义了一个registerShutdownHook()的方法，不需要参数，只需要显示调用此方法即可，方法实现中会向jvm绑定一个系统钩子，在关闭时将执行此钩子；非web项目通常需要手工创建ApplicationContext，样例代码如下：

import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.*;
import org.springframework.context.support.AbstractApplicationContext;

public class ServerApplication {

    //private static final ILog LOG = LogFactory.getLog(ServerApplication.class);


    public static void main(String[] args) {
        long b = System.currentTimeMillis();
    	//Spring启动时，会自动触发各Service启动
        ApplicationContext context =
                new AnnotationConfigApplicationContext(ServerApplication.class);

        long e = System.currentTimeMillis();
     //   LOG.info("ServerApplication started successfully in "+(e-b)+"ms.");
        if(context instanceof AbstractApplicationContext)
        {
            ((AbstractApplicationContext)context).registerShutdownHook();

        }
    }


}

 

 看下registerShutdownHook实现，如下所示，会调用doClose()来关闭Spring容器。

@Override
	public void registerShutdownHook() {
		if (this.shutdownHook == null) {
			// No shutdown hook registered yet.
			this.shutdownHook = new Thread() {
				@Override
				public void run() {
					doClose();
				}
			};
			Runtime.getRuntime().addShutdownHook(this.shutdownHook);
		}
	}