Spring配置与实例化(DI)xml形式

1.导入Spring jar包

myeclipse右键项目->MyEclipse->Project Facets->Spring

2.applicationContext.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"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.1.xsd">
<bean name="/userinfo" class="domain.Userinfo" id="userinfo"></bean>
<!-- db层 -->
<!-- 建议数据连接员 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost/jingteng?useUnicode=true&characterEncoding=utf-8"/>
<property name="username" value="root"/>
<property name="password" value="jingteng"/>
<property name="maxActive" value="100"/>
<property name="maxWait" value="10000"/>
<property name="maxIdle" value="30"/>
</bean>

<!-- 持久层dao-->
<bean name="userinfoDao" class="test2.UserinfoDao"></bean>

<!-- 业务层service -->
<bean name="userinfoService" class="test2.UserinfoService">
<!-- name是类里面的属性名，ref是引用spring的实例名字（17） -->
<property name="userinfoDao" ref="userinfoDao"></property>
</bean>

</beans>

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测试类1  Test.java:

package test2;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Test {

public static void main(String[] args) {
// 模拟控制层调用业务层
// UserinfoService service = new UserinfoService();
// service.save();

// 用spring做1.单例bean 2.ioc/di
// 解决第10行单例问题
ApplicationContext ctx = new ClassPathXmlApplicationContext(
"applicationContext.xml");
UserinfoService service = (UserinfoService)ctx.getBean("userinfoService");
service.save();
}

}

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测试类2(测试数据员连接池) Test3.java:

package test2;

import java.sql.Connection;

import java.sql.SQLException;

import org.apache.commons.dbcp.BasicDataSource;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Test3 {
public static void main(String[] args) {
ApplicationContext ctx = new ClassPathXmlApplicationContext(
"applicationContext.xml");

BasicDataSource bsds = (BasicDataSource)ctx.getBean("dataSource");

try {
Connection connection = bsds.getConnection();

System.out.println(connection.isClosed());
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}

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注：用javaBean中的set方法来实现实例化(di/ioc注入)

UserinfoService.java:

package test2;

public class UserinfoService {
//调用dao持久层
private UserinfoDao userinfoDao ;

//di/ioc注入
public void setUserinfoDao(UserinfoDao userinfoDao) {
this.userinfoDao = userinfoDao;
}

//业务层添加
public void save(){
userinfoDao.save();//调用持久层
}

}