注入依赖对象

知识点：
【

基本类型对象注入：
<bean id="orderService" class="cn.itcast.service.OrderServiceBean">
<constructor-arg index=“0” type=“java.lang.String” value=“xxx”/>//构造器注入
<property name=“name” value=“zhao/>//属性setter方法注入
</bean>
注入其他bean：
方式一
<bean id="orderDao" class="cn.itcast.service.OrderDaoBean"/>
<bean id="orderService" class="cn.itcast.service.OrderServiceBean">
<property name="orderDao" ref="orderDao"/>
</bean>
方式二(使用内部bean,但该bean不能被其他bean使用)
<bean id="orderService" class="cn.itcast.service.OrderServiceBean">
<property name="orderDao">
<bean class="cn.itcast.service.OrderDaoBean"/>
</property>
</bean>


】

环境搭建见上....

实现步骤：
第一步：建立PersonDaoBean 和 IpersonDao接口

IpersonDao.java
public interface IPersonDao {

public abstract void add();

}

PersonDaoBean.java

public class PersonDaoBean implements IPersonDao {
/* (non-Javadoc)
* @see com.liyong.PersonDaoBean.Imp.PersonDao#add()
*/
public void add(){
System.out.println("执行PersonDaoBean中的add()方法");
}
}

第二步：编写PersonServer和IPersonServer

IPersonServer.java

public interface IPersonServer {

public abstract void save();

}

PersonServer.java

public class PersonServer implements IPersonServer {
/*
* 注意必须为这些属性提供setter方法
* 通过属性注入依赖对象
*/
private IPersonDao personDao;
private String name;

public PersonServer(){}
/*
* 通过构造器来注入依赖对象
*/
public PersonServer(IPersonDao personDao,String name) {

this.name = name;
this.personDao = personDao;

}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public IPersonDao getPersonDao() {
return personDao;
}

public void setPersonDao(IPersonDao personDao) {
this.personDao = personDao;
}



public void save()
{
personDao.add();
System.out.println("name="+name);
System.out.println("save is OK !");
}
}

第四步：编写beans.xml文件

<?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">

<!--外部引用
<bean id="personDaoBean" class="com.liyong.PersonDaoBean.Imp.PersonDaoBean"/>
<bean id="personServer" class="com.liyong.ServersBean.PersonServer" >
<property name="personDao" ref="personDaoBean"/>
</bean>
-->
<!--使用内部bean,但该bean不能被其他bean使用
<bean id="personServer" class="com.liyong.ServersBean.PersonServer" >
<property name="personDao">
<bean class="com.liyong.PersonDaoBean.Imp.PersonDaoBean"/>
</property>
</bean>
-->
<!--使用构造器注入依赖对象-->
<bean id="personDaoBean" class="com.liyong.PersonDaoBean.Imp.PersonDaoBean"/>
<bean id="personServer" class="com.liyong.ServersBean.PersonServer">
<constructor-arg index="0" ref="personDaoBean"/>
<constructor-arg index="1" value="liyong"/>
</bean>
</beans>

第五步：编写单元测试

public class JUnitTest {

@Test
public void TestSave()
{
//得到Spring容器实例
ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
//ApplicationContext ctx2 = new ClassPathXmlApplicationContext(new String[]{"beans.xml"});

//这里面向接口
IPersonServer server =(IPersonServer)ctx.getBean("personServer");
server.save();
}
}

第六步：部署

.....