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一、属性注入
1，PersonDaoBean.java
package cn.itcast.dao.impl;
import cn.itcast.dao.PersonDao;
public class PersonDaoBean implements PersonDao {
/* (non-Javadoc)
* @see cn.itcast.dao.impl.PersonDao#add()
*/
@Override
public void add(){
System.out.println("执行PersonDaoBean中的add方法！");
}
}
PersonDao接口:
package cn.itcast.dao;
public interface PersonDao {
public abstract void add();
}
setter属性注入：
package cn.itcast.service.impl;
import cn.itcast.dao.PersonDao;
import cn.itcast.service.IPersonService;
public class PersonServiceBean implements IPersonService {
private PersonDao personDao;
public PersonDao getPersonDao() {
return personDao;
}
public void setPersonDao(PersonDao personDao) {
this.personDao = personDao;
}
@Override
public void save(){
personDao.add();
}
}
文件配置
<?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-2.5.xsd"> <bean id="personDao" class="cn.itcast.dao.impl.PersonDaoBean"></bean> <bean id="personService" class="cn.itcast.service.impl.PersonServiceBean"> <property name="personDao" ref="personDao"></property> </bean> </beans>
测试：
package org.test; import static org.junit.Assert.*; import org.junit.Test; import org.omg.CORBA.portable.ApplicationException; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import cn.itcast.service.IPersonService; public class SpringTest { @Test public void test() { ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
//此处虽然personDao没有显示的初始化，但是在beans.xml已经实现依赖注入了，所以不会出现空指针的问题。 IPersonService personservice = (IPersonService) ctx.getBean("personService"); personservice.save(); } }
二、内部bean注入：
<?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="personService" class="cn.itcast.service.impl.PersonServiceBean"> <property name="personDao"> <bean class="cn.itcast.dao.impl.PersonDaoBean"></bean> </property> </bean> </beans>
第一种方法的好处是可以被多个业务bean使用。
为基本属性注入：
<bean id="personService" class="cn.itcast.service.impl.PersonServiceBean"> <property name="personDao"> <bean class="cn.itcast.dao.impl.PersonDaoBean"></bean> </property> <property name="name" value="liushaocun"></property> </bean>
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原文地址：http://www.cnblogs.com/liusc0424/p/4423361.html
