Spring 学习总结 使用静态工厂创建Bean

Posted 2020-07-28 work hard work smart

创建Bean时，class属性必须指定，此时为静态工厂类。 factory-method指定静态工厂方法名。

接口：

public interface Being {
	public void testBeing();
}

Dog类

public class Dog implements Being{
	
	private String msg;

	public void setMsg(String msg) {
		this.msg = msg;
	}

	@Override
	public void testBeing() {
		System.out.println(msg + " 狗爱啃骨头");
		
	}

}

 

Cat类

public class Cat implements Being{

	private String msg;

	public void setMsg(String msg) {
		this.msg = msg;
	}

	@Override
	public void testBeing() {
		System.out.println(msg + " 猫爱吃老鼠!");
		
	}

}

　

Bean里配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
	<bean id="dog" class="com.springtest2.factory.BeingFactory"
		factory-method="getBeing">
		<constructor-arg value="dog" />
		<property name="msg" value="我是狗" />
	</bean>

	<bean id="cat" class="com.springtest2.factory.BeingFactory"
		factory-method="getBeing">
		<constructor-arg value="cat" />
		<property name="msg" value="我是猫" />
	</bean>

</beans>

　调用测试

	private static void testFactory(){
		ApplicationContext context = new ClassPathXmlApplicationContext(new String[]{"beans_factory.xml"});
		Being b1 = context.getBean("dog", Being.class);
		b1.testBeing();
		
		Being b2 = context.getBean("cat", Being.class);
		b2.testBeing();
	}

输出结果