lazy-init (不重要)
init-method destroy-methd 不要和prototype一起用(了解)
lazy-init=true延迟加载类
在Spring容器初始化时,不初始化该bean,很少用
当new ClassPathXmlContext时,Spring容器初始化时会加载全部Bean放到内存
当Spring容器中配置了很多个Bean,而经常需要重启时,则配置它
Spring是IOC容器,负责实例化Bean,负责把属性装配到Bean上
init-method destroy-methd 用于初始化Bean时执行的方法,和销毁方法
不要和prototype一起用,否则不执行销毁方法
<?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-2.5.xsd">
<bean id="u" class="com.bjsxt.dao.impl.UserDAOImpl">
</bean>
<bean id="userService" class="com.bjsxt.service.UserService" init-method="init"destroy-method="destroy" scope="prototype">
<!--
<property name="userDAO" ref="u" />
-->
<constructor-arg>
<ref bean="u"/>
</constructor-arg>
</bean>
</beans>
--------------------------------------------
public class UserService {
private UserDAO userDAO;
public void init() {
System.out.println("init");
}
//.............
public void destroy() {
System.out.println("destroy");
}
}