Java Spring Tutorial -- autowire byName, byType, constructor

文件结构：



package com.zxl.spring;

public class MessageBean {
private RefMessageBean refMessageBean;
/* bean & constructor */
/*public MessageBean(RefMessageBean refMessageBean){
this.refMessageBean=refMessageBean;
}*/
public void setRefMessageBean(RefMessageBean refMessageBean){
this.refMessageBean=refMessageBean;
}
public RefMessageBean getRefMessageBean(){
return refMessageBean;
}
}

package com.zxl.spring;

public class RefMessageBean {
private String message;
public RefMessageBean(String message){
this.message=message;
}
public String getMessage(){
return message;
}
}

package com.zxl.spring;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class SpringApp09 {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
ClassPathXmlApplicationContext context=new ClassPathXmlApplicationContext("SpringBeans.xml");
MessageBean messageBean =(MessageBean) context.getBean("messageBean");
System.out.println(messageBean.getRefMessageBean().getMessage());
context.close();
}

}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://www.springframework.org/schema/beans"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <!-- bean -->
<!-- <bean id="messageBean" class="com.zxl.spring.MessageBean" >
<constructor-arg ref="refMessageBean" />
</bean>
<bean id="refMessageBean" class="com.zxl.spring.RefMessageBean" >
<constructor-arg value="hello!!" />
</bean>	 -->
<!-- [][][] -->

<!-- constructor -->
<!-- <bean id="messageBean" class="com.zxl.spring.MessageBean" autowire="constructor" />
<bean class="com.zxl.spring.RefMessageBean">
<constructor-arg value="hello!!" />
</bean>  -->
<!-- [][][] -->

<!-- byName -->
<!-- <bean id="messageBean" class="com.zxl.spring.MessageBean" autowire="byName" />
<bean id="refMessageBean" class="com.zxl.spring.RefMessageBean" >
<constructor-arg value="hello!!" />
</bean>  -->
<!-- [][][] -->

<!-- byType -->
<bean id="messageBean" class="com.zxl.spring.MessageBean" autowire="byType" />
<bean id="refMessageBean" class="com.zxl.spring.RefMessageBean" >
<constructor-arg value="hello!!" />
</bean>
<!-- [][][] -->
</beans>