Java 獲取Springboot中bean案例

場景：當使用到工廠模式的時候，並在工廠實例中使用外部的service層對象，會這個對象是一個空對象，因此有必要通過spring去獲取bean

1、SpringBeanUtil.java

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
public class SpringBeanUtil implements ApplicationContextAware {
    private static Logger springBeanUtilLog = LoggerFactory.getLogger(SpringBeanUtil.class);

    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        if(SpringBeanUtil.applicationContext == null) {
            SpringBeanUtil.applicationContext = applicationContext;
        }
        springBeanUtilLog.info("========ApplicationContext配置成功,在普通類可以通過調用SpringUtils.getAppContext()獲取applicationContext對象,applicationContext={}",SpringBeanUtil.applicationContext);
    }

    /**
     * 獲取applicationContext
     * @return
     */
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    /**
     * 通過name獲取 Bean.
     * @param name
     * @return
     */
    public static Object getBean(String name){
        return getApplicationContext().getBean(name);
    }

    /**
     * 通過class獲取Bean.
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> T getBean(Class<T> clazz){
        return getApplicationContext().getBean(clazz);
    }

    /**
     * 通過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 getApplicationContext().getBean(name, clazz);
    }

}

完畢