Spring - IOC - 入门实例

最新推荐文章于 2025-12-30 14:28:35 发布

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#IOC #Spring #log4j #Bean #XML

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本文通过一个具体的示例展示了如何使用Spring框架进行依赖注入。示例中定义了Person和Axe两个接口，以及它们的实现类Chinese和StoneAxe。通过配置文件ApplicationContext.xml将StoneAxe实例注入到Chinese类中，并在TestSpringDemo类中调用useAxe方法展示StoneAxe的行为。

两个接口Person 和 Axe

package wei.peng;

public interface Person {
	
	public void useAxe();
}

package wei.peng;

public interface Axe {

	public String chop();
}

两个实现类Chinese 和 StoneAxe

package wei.peng;

public class Chinese implements Person {

	private Axe axe;
	
	public void setAxe(Axe axe) {
		this.axe = axe;
	}

	@Override
	public void useAxe() {
		// TODO Auto-generated method stub
		System.out.println(axe.chop());
	}

}

package wei.peng;

public class StoneAxe implements Axe {

	@Override
	public String chop() {
		// TODO Auto-generated method stub
		return "Stone axe is so slow.... I want a steel axe.";
	}

}

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"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
	
	<bean name="chinese" class="wei.peng.Chinese">
		<property name="axe">
			<ref local="StoneAxe" />
		</property>
	</bean>
	
	<bean id="StoneAxe" class="wei.peng.StoneAxe"></bean>
</beans>

Test类

package wei.peng;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;

public class TestSpringDemo {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		ApplicationContext ctx = new FileSystemXmlApplicationContext("/src/applicationContext.xml");  
		Person per = (Person)ctx.getBean("chinese");
		per.useAxe();
	}

}

Test Result

log4j:WARN No appenders could be found for logger (org.springframework.context.support.FileSystemXmlApplicationContext).
log4j:WARN Please initialize the log4j system properly.
Stone axe is so slow.... I want a steel axe.