spring的简单事例

1、spring依赖库
* spring.jar
* Scommons-logging.jar
* log4j-1.2.14.jar
2、拷贝spring配置文件到src下
3、拷贝log4j配置文件到src下
4、在UserManagerImpl中提供构造函数或setter方法，spring将实例化好的UserDao实现注入给我们
5、让spring管理我们的对象创建和依赖，必须在spring配置中进行定义
6、编写客户端
spring Ioc容器的关键点：
* 必须将被管理的对象定义到spring配置文件中

* 必须定义构造函数或setter方法，让spring将对象注入过来

针对spring配置时，可对象的某个属性值进行配置，达到整个项目的全局参数的效果，维护起来方式，针对对象的属性值配置如string,int,list,map,同时按类型名称和类型对应等相关配置，在些不做说明，只是列出简单的应用，以备后期查询使用

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>


<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd"
<!-- default-autowire="byType" default-autowire="byName" --> 
>
           
<bean id="userDao4MySqlImpl" class="com.bjsxt.spring.dao.UserDao4MySqlImpl"/>
<bean id="userDao4OracleImpl" class="com.bjsxt.spring.dao.UserDao4OracleImpl"/>

<bean id="userManager" class="com.bjsxt.spring.manager.UserManagerImpl">

<!-- 构造方法注入 
<constructor-arg ref="userDao4OracleImpl"/>
-->
<property name="userDao" ref="userDao4OracleImpl"/>
</bean>

<!-- <bean id="bean3222" class="com.bjsxt.spring.Bean3" parent="beanAbstract">
    <property name="name" value="Tom"/>
    <property name="password" value="123"/>
   </bean>        
   
   <bean id="bean42222" class="com.bjsxt.spring.Bean4" parent="beanAbstract"/> -->
</beans>

import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;


public class Client {


public static void main(String[] args) {
//applicationContext.xml 如改成applicationContext-*.xml表示对前缀为applicationContext-的所有文件的匹配
BeanFactory factory = new ClassPathXmlApplicationContext("applicationContext.xml");

UserManager userManager = (UserManager)factory.getBean("userManager");
userManager.save("张三", "123");


}
}

public interface UserDao {

public void save(String username, String password);
}

public class UserDao4MySqlImpl implements UserDao {


public void save(String username, String password) {
System.out.println("--------UserDao4MySqlImpl.save()-------");
}
}

public class UserDao4OracleImpl implements UserDao {


public void save(String username, String password) {
System.out.println("--------UserDao4OracleImpl.save()-------");
}
}

public interface UserManager {

public void save(String username, String password);
}

public class UserManagerImpl implements UserManager {

private UserDao userDao;

// public UserManagerImpl(UserDao userDao) {
// this.userDao = userDao;
// } 

public void save(String username, String password) {
this.userDao.save(username, password);
}


public void setUserDao(UserDao userDao) {
this.userDao = userDao;
}
}