标签：信息 factor path refresh hiera classpath odi name property
看如下代码
<?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="car" class="logan.spring.study.autowire.Car"> <property name="brand" value="Audi"></property> <property name="price" value="3000000"></property> </bean> </beans>
package logan.spring.study.scope; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import logan.spring.study.autowire.Car; public class Main { public static void main(String[] args) { // TODO Auto-generated method stub ApplicationContext ctx = new ClassPathXmlApplicationContext("beans-scope.xml"); Car car1 = (Car) ctx.getBean("car"); Car car2 = (Car) ctx.getBean("car"); System.out.println(car1 == car2); } }
输出结果为：
五月 20, 2017 4:39:17 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh 信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@3eb07fd3: startup date [Sat May 20 16:39:17 CST 2017]; root of context hierarchy 五月 20, 2017 4:39:17 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions 信息: Loading XML bean definitions from class path resource [beans-scope.xml] true
可以看到从IOT获得的Car实例是单例的。
事实上，我们可以设置bean的作用域，如下：
<?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="car" class="logan.spring.study.autowire.Car" scope="prototype"> <property name="brand" value="Audi"></property> <property name="price" value="3000000"></property> </bean> </beans>
package logan.spring.study.scope; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import logan.spring.study.autowire.Car; public class Main { public static void main(String[] args) { // TODO Auto-generated method stub ApplicationContext ctx = new ClassPathXmlApplicationContext("beans-scope.xml"); Car car1 = (Car) ctx.getBean("car"); Car car2 = (Car) ctx.getBean("car"); System.out.println(car1 == car2); } }
下面是输出结果
五月 20, 2017 4:42:00 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh 信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@3eb07fd3: startup date [Sat May 20 16:42:00 CST 2017]; root of context hierarchy 五月 20, 2017 4:42:00 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions 信息: Loading XML bean definitions from class path resource [beans-scope.xml] false
使用prototype作用域，bean的实例就不是单例的了。每次获取Bean的时候返回的都是新的Bean。默认值是单例的。
标签：信息 factor path refresh hiera classpath odi name property
原文地址：http://www.cnblogs.com/LoganChen/p/6882506.html
