spring创建工厂的三种方式

基础代码
		ApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
		People people = applicationContext.getBean("peo", People.class);
		System.out.println(people);

1. 构造方法（默认无参构造，可以有参构造）

无参构造
<bean id="peo" class="com.run.People"></bean>

有参构造
	<bean id="peo" class="com.run.People">
		<constructor-arg name="name" value="ych"></constructor-arg>
		<constructor-arg name="age" value="30"></constructor-arg>
	</bean>

2. 实例工厂

public class PeopleFactory {
	public People getPeople() {
		return new People();
	}
}

	<bean id="fac1" class="com.run.PeopleFactory"></bean>
	<bean id="peo" factory-bean="fac1" factory-method="getPeople"></bean>

3. 静态工厂

public class PeopleFactory {
	public static People getPeople1() {
		People people = new People();
		people.setName("ych");
		return people;
	}
}

<bean id="peo" class="com.run.PeopleFactory" factory-method="getPeople1"></bean>