使用Spring(三)依赖注入DI（Setter DI，构造器注入）

<?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.xsd"> <bean id="exampleBean" class="com.yw.test03.ExampleBean">

<!-- setter injection using the nested <ref/> element -->
<property name="beanOne">
<ref bean="anotherExampleBean" />
</property>

<!-- setter injection using the neater 'ref' attribute -->
<property name="beanTwo" ref="yetAnotherBean" />
<property name="integerProperty" value="1" />
</bean>

<bean id="anotherExampleBean" class="com.yw.test03.AnotherBean" />
<bean id="yetAnotherBean" class="com.yw.test03.YetAnotherBean" />
</beans>

<?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.xsd"> <bean id="exampleBean" class="com.yw.test03.ExampleBean2">
<!-- constructor injection using the nested <ref/> element -->
<constructor-arg>
<ref bean="anotherExampleBean" />
</constructor-arg>

<!-- constructor injection using the neater 'ref' attribute -->
<constructor-arg ref="yetAnotherBean" />

<constructor-arg type="int" value="1" />
</bean>
<bean id="anotherExampleBean" class="com.yw.test03.AnotherBean" />
<bean id="yetAnotherBean" class="com.yw.test03.YetAnotherBean" />
</beans>

package com.yw.test03;

public class AnotherBean
{

}

package com.yw.test03;

public class YetAnotherBean
{

}

package com.yw.test03;

public class ExampleBean
{
private AnotherBean beanOne;
private YetAnotherBean beanTwo;
private int i;

public void setBeanOne(AnotherBean beanOne) {
this.beanOne = beanOne;
}

public void setBeanTwo(YetAnotherBean beanTwo) {
this.beanTwo = beanTwo;
}

public void setIntegerProperty(int i) {
this.i = i;
}

}

package com.yw.test03;

public class ExampleBean2
{
private AnotherBean beanOne;
private YetAnotherBean beanTwo;
private int i;

public ExampleBean2(AnotherBean anotherBean, YetAnotherBean yetAnotherBean, int i)
{
System.out.println("=构造器=ExampleBean2(AnotherBean anotherBean, YetAnotherBean yetAnotherBean, int i)=");
this.beanOne = anotherBean;
this.beanTwo = yetAnotherBean;
this.i = i;
}
}

package com.yw.test03;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.Resource;

public class Test01
{
public static void main(String[] args)
{
//实例化容器方法一
//		Resource resource = new FileSystemResource("src/com/yw/test02/applicationContext.xml");
//		BeanFactory factory = new XmlBeanFactory(resource);

//实例化容器方法二
//		ClassPathResource resource = new ClassPathResource("com/yw/test02/applicationContext.xml");
//		BeanFactory factory = new XmlBeanFactory(resource);

//实例化容器方法三
ApplicationContext context = new ClassPathXmlApplicationContext(new String[] { "com/yw/test03/applicationContext.xml"});
// of course, an ApplicationContext is just a BeanFactory
BeanFactory factory = (BeanFactory) context;

//XML格式定义的Setter DI例子
Object obj=factory.getBean("exampleBean");
System.out.println("obj="+obj);
}
}

package com.yw.test03;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.Resource;

public class Test02
{
public static void main(String[] args)
{
//实例化容器方法一
//		Resource resource = new FileSystemResource("src/com/yw/test02/applicationContext.xml");
//		BeanFactory factory = new XmlBeanFactory(resource);

//实例化容器方法二
//		ClassPathResource resource = new ClassPathResource("com/yw/test02/applicationContext.xml");
//		BeanFactory factory = new XmlBeanFactory(resource);

//实例化容器方法三
ApplicationContext context = new ClassPathXmlApplicationContext(new String[] { "com/yw/test03/applicationContext2.xml"});
// of course, an ApplicationContext is just a BeanFactory
BeanFactory factory = (BeanFactory) context;

//XML格式定义的构造器注入例子
Object obj=factory.getBean("exampleBean");
System.out.println("obj="+obj);
}
}