博客 - 使用SpringContextHolder

import java.util.Map;

​

import org.springframework.beans.BeansException;

import org.springframework.context.ApplicationContext;

import org.springframework.context.ApplicationContextAware;

import org.springframework.stereotype.Component;

​

//

//import org.apache.commons.lang3.Validate;

//import org.slf4j.Logger;

//import org.slf4j.LoggerFactory;

//import org.springframework.beans.factory.DisposableBean;

//import org.springframework.context.ApplicationContext;

//import org.springframework.context.ApplicationContextAware;

//import org.springframework.context.annotation.Lazy;

//import org.springframework.stereotype.Service;

//

//@Service

//@Lazy(false)

//public class SpringContextHolder implements ApplicationContextAware, DisposableBean {

//	private static ApplicationContext applicationContext = null;

//

//	private static Logger logger = LoggerFactory.getLogger(SpringContextHolder.class);

//

//	public static ApplicationContext getApplicationContext() {

//		assertContextInjected();

//		return applicationContext;

//	}

//

//	public static <T> T getBean(String name) {

//		assertContextInjected();

//		return (T) applicationContext.getBean(name);

//	}

//

//	public static <T> T getBean(Class<T> requiredType) {

//		assertContextInjected();

//		return applicationContext.getBean(requiredType);

//	}

//

//	public static void clearHolder() {

//		if (logger.isDebugEnabled()) {

//			logger.debug("清除SpringContextHolder中的ApplicationContext:" + applicationContext);

//		}

//		applicationContext = null;

//	}

//

//	public void setApplicationContext(ApplicationContext applicationContext) {

//		applicationContext = applicationContext;

//	}

//

//	public void destroy() throws Exception {

//		clearHolder();

//	}

//

//	private static void assertContextInjected() {

//		Validate.validState(applicationContext != null,

//				"applicaitonContext属性未注入, 请在applicationContext.xml中定义SpringContextHolder.", new Object[0]);

//	}

//}

​

​

@Component

public class SpringContextHolder implements ApplicationContextAware {

​

    /**

     * 以静态变量保存ApplicationContext,可在任意代码中取出ApplicaitonContext.

     */

    private static ApplicationContext context;

​

    /**

     * 实现ApplicationContextAware接口的context注入函数, 将其存入静态变量.

     */

​

    @Override

    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {

        SpringContextHolder.context = applicationContext;

    }

​

    /**

     * 获取applicationContext

     * @return

     */

    public ApplicationContext getApplicationContext() {

        return context;

    }

​

    /**

     * 通过name获取 Bean.

     * @param name

     * @return

     */

    @SuppressWarnings("unchecked")

	public static <T> T getBean(String name){

        return (T) context.getBean(name);

    }

​

    /**

     * 通过class获取Bean.

     * @param clazz

     * @param <T>

     * @return

     */

    public static <T> Map<String, T> getBeans(Class<T> clazz){

        return context.getBeansOfType(clazz);

    }

​

    /**

     * 通过class获取Bean.

     * @param clazz

     * @param <T>

     * @return

     */

    public static <T> T getBean(Class<T> clazz){

        return context.getBean(clazz);

    }

​

    /**

     * 通过name,以及Clazz返回指定的Bean

     * @param name

     * @param clazz

     * @param <T>

     * @return

     */

    public static <T> T getBean(String name, Class<T> clazz){

        return context.getBean(name, clazz);

    }

}