spring 事件发布工具

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ApplicationEvent;
import org.springframework.stereotype.Component;
import org.springframework.util.Assert;

import java.util.Map;

@Component
public class SpringApplicationContext implements ApplicationContextAware {
    private static ApplicationContext ctx;

    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        ctx = applicationContext;
    }

    @SuppressWarnings("unchecked")
    public static <T> T getBean(String beanName) {
        Assert.notNull(ctx, "ApplicationContext cannot be null");
        return (T) ctx.getBean(beanName);
    }

    public static <T> T getBean(String beanName, Class<T> type) {
        Assert.notNull(ctx, "ApplicationContext cannot be null");
        return (T) ctx.getBean(beanName, type);
    }

    public static <T> Map<String,T> getBeansOfType(Class<T> type) {
        Assert.notNull(ctx, "ApplicationContext cannot be null");
        return ctx.getBeansOfType( type);
    }

    public static <T> T getBean(Class<T> type) {
        Assert.notNull(ctx, "ApplicationContext cannot be null");
        return (T) ctx.getBean(type);
    }

    public static void publishEvent(ApplicationEvent event) {
        Assert.notNull(ctx, "ApplicationContext cannot be null");
        ctx.publishEvent(event);
    }

    public static ApplicationContext getCtx() {
        return ctx;
    }
}