Spring 的 BeanFactory 中自动注入的依赖 Bean

package sping.analysis.aware;

import java.util.Map;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Component;

/**
 * Spring 的 BeanFactory 中自动注入的依赖 Bean
 * Register default environment beans:
 * 	environment
 *  systemProperties
 *  systemEnvironment
 * 
 * @author slHuang
 * @since 2019-02-08
 */
@Component
public class MyBeanAutowiredBeans {
	
	@Autowired
	private BeanFactory beanFactory;
	
	public void useEnvironment() {
		Environment environment = (Environment) this.beanFactory.getBean("environment");
		System.out.println(environment.getProperty("java.home"));
	}
	
	public void useSystemProperties() {
		@SuppressWarnings("unchecked")
		Map<String, Object> res = (Map<String, Object>) this.beanFactory.getBean("systemProperties");
		System.out.println(res.get("java.runtime.version"));
	}
	
	public void useSystemEnvironment() {
		@SuppressWarnings("unchecked")
		Map<String, Object> res = (Map<String, Object>) this.beanFactory.getBean("systemEnvironment");
		System.out.println(res.get("LOCALAPPDATA"));
	}
}