Spring三种注入方式（一）

构造方法注入

通过constructor-arg指定构造方法的参数

 

Source.java

package com.gary.test;

public class Source {
	
	public void helloWorld(){
		System.out.println("Hello World!");
	}
}

 

 Target.java

package com.gary.test;

public class Target {
	
	private Source source;
	
	public Target(Source source){
		this.source = source;
	}
	
	public void sayHelloWorld(){
		source.helloWorld();
	}
	
}

 

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:p="http://www.springframework.org/schema/p"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

	<bean id="source" class="com.gary.test.Source" />
	<bean id="target" class="com.gary.test.Target">
		<constructor-arg ref="source" />
	</bean>
</beans>

 

TargetTest.java

package com.gary.test;

import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TargetTest {

	static BeanFactory factory = null;
	static Target target = null;
	
	@BeforeClass
	public static void setUpBeforeClass() throws Exception {
		try{
			factory = new ClassPathXmlApplicationContext("applicationContext.xml");
			target = (Target) factory.getBean("target");
		}catch(Exception e){
			e.printStackTrace();
		}
	}

	@AfterClass
	public static void tearDownAfterClass() throws Exception {
		
	}

	@Test
	public void testSayHelloWorld() {
		target.sayHelloWorld();
	}

}

 

运行结果

Hello World!

 

 

demo见附件

评论

1 楼 yingzhor 2011-01-20  

还有一种叫啥“接口注入”吧。 那玩意纯扯淡，根本没人用。