场景

在一些开发过程中，@Component,@Configuration类中使用@Autowired、@Resource无法注入需要Bean的情况下，我们需要通过手动方式实现Bean的注入，可以通过实现ApplicationContextAware达到预期目标

代码实现

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

@Component
public class SpringContextUtils implements ApplicationContextAware {

    public static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext)
            throws BeansException {
        SpringContextUtils.applicationContext = applicationContext;
    }

    public static Object getBean(String name) {
        return applicationContext.getBean(name);
    }

    public static <T> T getBean(String name, Class<T> requiredType) {
        return applicationContext.getBean(name, requiredType);
    }

    public static boolean containsBean(String name) {
        return applicationContext.containsBean(name);
    }

    public static boolean isSingleton(String name) {
        return applicationContext.isSingleton(name);
    }

    public static Class<? extends Object> getType(String name) {
        return applicationContext.getType(name);
    }
}

使用

避免Bean加载顺序导致NullPointException，建议在需要引用工具类的类上添加注解@DependsOn("springContextUtils")

注入Bean
Bean bean= (Bean)SpringContextUtils.getBean("beanName")