Spring入门案例

Spring入门案例

 

1. 导入两个jar包（在spring-framework-2.5.6文件内）

  （1）commons-logging.jar

  （2）spring.jar

 

2.两个接口，两个实现类，一个测试类,一个配置文件

 接口：AccountDaoIf.java，AccountServiceIf.java

实现类：AccountDao.java，AccountService.java

测试类：Test.java

配置文件：bean.xml

 

具体路径如图所示：

 

 

3.接口及实现类代码

（1）AccountDaoIf.java

package first;

public interface AccountDaoIf {
         //两种方法表示存款和取款
	public void withdraw();
	public void deposit();
}

 

 

 

 

 

 

 

 

 

 

 

 

 

 

（2）AccountDao.java

package first;

public class AccountDao implements AccountDaoIf {

	public void deposit() {
     System.out.println("deposit!");
		
	}

	public void withdraw() {
      System.out.println("withdraw!");
	}

}

 

（3) AccountServiceIf.java

package first;

public interface AccountServiceIf {
	//交易方法
	void transfer();
}

 

(4)AccountService.java

package first;

public class AccountService implements AccountServiceIf {

	private AccountDaoIf dao;	
	public void transfer() {
		System.out.println("transation begin");
		dao.withdraw();
		dao.deposit();
		System.out.println("transation commit");
	}
	//dao通过set方法注入
	public void setDao(AccountDaoIf dao){
		this.dao=dao;
	}
}

4.配置文件代码（通过配置文件实例化对象）

<?xml version="1.0" encoding="UTF-8"?>
	<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN"
			"http://www.springframework.org/dtd/spring-beans-2.0.dtd">
<beans>

	<bean id="dao" class="first.AccountDao" />
	<bean id="service" class="first.AccountService">
		<property name="dao">
			<ref bean="dao" />
		</property>
	</bean>
</beans>

5.测试类

test.java

package test;
import first.AccountServiceIf;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;

public class Test {
	public static void main(String[] args) {
		ClassPathResource resource=new ClassPathResource("bean.xml");
		XmlBeanFactory factory =new XmlBeanFactory(resource);
		AccountServiceIf service =(AccountServiceIf) factory.getBean("service");
		service.transfer();
	}
}

 

 

6.运行结果：