spring中构造函数注入

spring中构造函数注入，简单来说，就是通过beans.xml中，设置对应的值。而且通过bean类中的构造函数进行注入这些值。

文件结构



Goods类

package com.test.innerbean;

public class Goods {
private String goodsName;
private int price;

public Goods(String name,int price)
{
goodsName=name;
this.price=price;
}

public void say()
{
System.out.println("goodsname:"+goodsName+" price:"+price);
}

}

beans.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 id="goods" class="com.test.innerbean.Goods">
<constructor-arg  value="茶杯"></constructor-arg>
<constructor-arg value="12"></constructor-arg>
</bean>

</beans>

測试类

package com.test.innerbean;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;

public class Test {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
BeanFactory factory=new XmlBeanFactory(new ClassPathResource("com/test/innerbean/beans.xml"));
Goods goods=(Goods)factory.getBean("goods");
goods.say();
}

}

输出结果



我们可以看到。可以产生Goods类的一个实例，而且对这个实例进行输出測试。发现也的确获得了对应的值。