spring实例化bean以及构造器装配属性

来源：互联网发布：sql 添加合计行编辑：程序博客网时间：2024/05/29 13:58

Spring三种实例化Bean的方式
1、使用类构造器实例化 90%
<bean id="personService" class="com.insigma.service.impl.PersonServiceBean"></bean>

2、使用静态工厂方法实例化
<bean id="personService" class="com.insigma.service.PersonServiceBeanFactory" factory-method="createPersonServiceBean"></bean>
public class PersonServiceBeanFactory
{
public static PersonServiceBean createPersonServiceBean()
{
return new PersonServiceBean();
}
}

3、使用实例化工厂方法实例化
<bean id="personServiceFactory" class="com.insigma.service.PersonServiceBeanFactory" ></bean>
<bean id="personService" class="com.insigma.service.PersonServiceBeanFactory" factory-bean="personServiceFactory"factory-method="createPersonServiceBean"></bean>
public class PersonServiceBeanFactory
{
public PersonServiceBean createPerson()
{
return new PersonServiceBean();
}

}

private PersonDao personDao;
private String personName;
private int personAge;

public PersonServiceBean(PersonDao personDao, String personName,
int personAge) {
this.personDao = personDao;
this.personName = personName;
this.personAge = personAge;
}

<bean id="personService" class="com.insigma.service.impl.PersonServiceBean" init-method="initBean" destroy-method="destoryBean">

<constructor-arg index="0" type="com.insigma.dao.PersonDao" ref="personDao" />
<constructor-arg index="1" type="String" value="张三" />
<constructor-arg index="2" type="int" value="33" />
</bean>