五 依赖注入

五 依赖注入
1>set注入方式
1 对象注入 
先看接口 PersonDao.java
package cn.itcast.service;

public interface PersonDao {

	public void add();

}

PersonService
package cn.itcast.service;

public interface PersonService {

	public void save();

}


实现类 
PersonDaoBean.java

package cn.itcast.service.impl;

import cn.itcast.service.PersonDao;

public class PersonDaoBean implements PersonDao {
    /* (non-Javadoc)
	 * @see cn.itcast.service.impl.PersonDao#add()
	 */
    public void add(){
    	System.out.println("我是PersonDaoBean里的add方法");
    }
}

PersonServiceBean.java
package cn.itcast.service.impl;

import cn.itcast.service.PersonDao;
import cn.itcast.service.PersonService;

public class PersonServiceBean implements PersonService {
    private PersonDao persondao;
	public PersonDao getPersondao() {
		return persondao;
	}
	public void setPersondao(PersonDao persondao) {
		this.persondao = persondao;
	}
	public void save(){
		System.out.println("我是在PersonServiceBean中的save()方法");
		persondao.add();
	}
	public void init(){
		System.out.println("我是在PersonServiceBean中的初始化的方法");
	}
	public void destroy(){
		System.out.println("我是在PersinServiceBean中的释放资源的方法");
	}
}




配置文件 
<?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">
      <!-- 依赖对象 -->
      <!-- 方式一 set方法注入  -->
      <!--  
      <bean id="persondao" class="cn.itcast.service.impl.PersonDaoBean"></bean>    
      <bean id="personservice" class="cn.itcast.service.impl.PersonServiceBean" init-method="init" destroy-method="destroy">
      <property name="persondao" ref="persondao"></property>
      </bean>
      -->
      
        <!-- 方式二(使用内部bean,但该bean不能被其他bean使用) -->
        <bean id="personservice" class="cn.itcast.service.impl.PersonServiceBean" init-method="init" destroy-method="destroy">
        <property name="persondao">
        <bean class="cn.itcast.service.impl.PersonDaoBean"></bean>
        </property>
        </bean>
</beans>


执行代码
AbstractApplicationContext tx=new ClassPathXmlApplicationContext("beans.xml");
PersonService personservie=(PersonService)tx.getBean("personservice");
personservie.save();
tx.close();

2 基本类型数据注入


<bean id="personservice" class="cn.itcast.service.impl.PersonServiceBean" init-method="init" destroy-method="destroy">
 <property name="persondao">
 <bean class="cn.itcast.service.impl.PersonDaoBean"></bean>   
 </property>
  <!-- 基本类型数据注入 -->
  <property name="name" value="itcast"></property>   
 </bean>


 实现类修改
 package cn.itcast.service.impl;

import cn.itcast.service.PersonDao;
import cn.itcast.service.PersonService;

public class PersonServiceBean implements PersonService {
    private PersonDao persondao;
    private String name;
	public PersonDao getPersondao() {
		return persondao;
	}
	public void setPersondao(PersonDao persondao) {
		this.persondao = persondao;
	}
	public void save(){
		System.out.println("我是在PersonServiceBean中的save()方法");
		System.out.println("name="+name);
		persondao.add();
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public void init(){
		System.out.println("我是在PersonServiceBean中的初始化的方法");
	}
	public void destroy(){
		System.out.println("我是在PersinServiceBean中的释放资源的方法");
	}
}

测试 
AbstractApplicationContext tx=new ClassPathXmlApplicationContext("beans.xml");
PersonService personservie=(PersonService)tx.getBean("personservice");
personservie.save();
tx.close();


3 集合属性注入
Set集合属性注入
 <!-- 集合注入 -->
         <property name="set">
         <set>
         <value>第一个</value>
         <value>第二个</value>
         <value>第三个</value>
         </set>
         </property>
         <property name="list">
         <list>
           <value>list集合1</value>
           <value>list集合2</value>
           <value>list集合3</value>
         </list>
         </property>
         <property name="p">
         <props>
         <prop key="who is he?">我是谁</prop>
         <prop key="do you know">你懂吗</prop>
         <prop key="that's goodidear">好主意</prop>
         </props>
         </property>
         <property name="map">
         <map>
         <entry key="xuchunrong" value="许春荣"></entry>
         <entry key="huhuan" value="huhuan"></entry>
         <entry key="nihao" value="李好"></entry>
         </map>
         </property>




2>构造器注入方式
1 利用构造器注入方式注入属性和对象值
配置
  <bean id="persondao" class="cn.itcast.service.impl.PersonDaoBean"></bean>
          <bean id="personService" class="cn.itcast.service.impl.PersonServiceBean">
          <constructor-arg index="0" ref="persondao"></constructor-arg>
          <constructor-arg index="1" value="xuchunrong"></constructor-arg>
</bean>

接口
package cn.itcast.service;

public interface PersonDao {

	public void add();

}


package cn.itcast.service;

public interface PersonService {

	public void save();

}


实现类
package cn.itcast.service.impl;

import cn.itcast.service.PersonDao;

public class PersonDaoBean implements PersonDao {
    /* (non-Javadoc)
	 * @see cn.itcast.service.impl.PersonDao#add()
	 */
    public void add(){
    	System.out.println("我是PersonDaoBean里的add方法");
    }
}




package cn.itcast.service.impl;

import cn.itcast.service.PersonDao;
import cn.itcast.service.PersonService;

public class PersonServiceBean implements PersonService {
    private PersonDao persondao;
    private String name;
	public void save(){
		System.out.println("我是save()方法");
		this.persondao.add();
		System.out.println("name----------->"+name);
		
	}
	public PersonServiceBean(PersonDao persondao, String name) {
		this.persondao = persondao;
		this.name = name;
	}

}



测试类
AbstractApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
PersonService personService = (PersonService)ctx.getBean("personService");
personService.save();


3>使用Field注入（用于注解方式）