为验证,我们写一个类,包括如下几个元素:
public class UserInfo {
static {
System.out.println("静态代码块");
}
{
System.out.println("非静态代码块");
}
private String name;
public UserInfo() {
System.out.println("构造方法");
}
public String getName() {
System.out.println("get方法");
return name;
}
public void setName(String name) {
System.out.println("set方法");
this.name = name;
}
public void init() {
System.out.println("init");
}
public void destroy(){
System.out.println("销毁");
}
}
XML文件如下配置:
<?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.xsd">
<bean id= "userInfo" class="com.jd.vo.UserInfo" lazy-init="true" init-method="init" destroy-method="destroy"><!--scope可以是除"prototype"外其他任意值,因为scope为prototype时,destroy方法不执行-->
<property name="name" value="Tom"></property>
</bean>
</beans>
再创建一的测试类:
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Test {
public static void main(String[] args) {
ClassPathXmlApplicationContext classPathXmlApplicationContext = new ClassPathXmlApplicationContext("application.xml");//创建IOC容器并为xml中配置的类创建对象
Object object = classPathXmlApplicationContext.getBean("userInfo");
System.out.println(object);
}
}
运行Test类:
观察结果,可知spring中,对象的生命周期为静态代码块->动态代码块->构造方法->set方法->init->方法->main方法->destroy方法