Spring中获取IOC容器中的Bean实例工具封装

在spring中获取Bean的方式有很多们，这里使用实现ApplicationContextAware接口的方式封装一个可以快速获取Bean实例的方式，具体实现实例：

实现ApplicationContextAware接口获取程序运行上下文：

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

/**
 * 描述：获取spring上下文环境，即ApplicationContext
 *
 * @author SXT
 * @version 1.0
 * @date 2022/10/23
 */
@Component
public final class ApplicationContextHandler implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

    /**
     * 获取运行程序的上下文环境
     */
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        ApplicationContextHandler.applicationContext = applicationContext;
    }

    /**
     * 获取运行程序的上下文环境 applicationContext
     * @return bean实例
     */
    public static ApplicationContext getApplicationContext(){
        assertApplicationContext();
        return applicationContext;
    }

    private static void assertApplicationContext(){
        if (null == applicationContext) {
            throw new RuntimeException("ApplicationContextHandler中applicationContext属性为null,请确保ApplicationContext正常注入");
        }
    }
}

封装获取bean实例工具类：

import org.springframework.context.ApplicationContext;

/**
 * 描述：获取IOC容器中的bean实例
 *
 * @author SXT
 * @version 1.0
 * @date 2022/10/23
 */
public final class BeanUtils {

    private static ApplicationContext applicationContext = ApplicationContextHandler.getApplicationContext();

    private BeanUtils(){}

    /**
     * 获取指定的bean
     * @return bean实例
     */
    public static <T> T getBean(String beanName,Class<T> tClass){
        return applicationContext.getBean(beanName,tClass);
    }

    /**
     * 获取指定bean名实例
     * @return bean实例
     */
    @SuppressWarnings("unchecked")
    public static <T> T getBean(String beanName){
        return (T)applicationContext.getBean(beanName);
    }

    /**
     * 获取指定bean类型实例
     * @return bean实例
     */
    public static <T> T getBean(Class<T> tClass){
        return applicationContext.getBean(tClass);
    }

}