参考文章
Introduction to the Spring IoC container and beans
BeanFactory 和ApplicationContext(Bean工厂和应用上下文)
Spring ApplicationContext - Resource leak: 'context' is never closed
版本说明
- JDK 1.7
- Spring3.2.14
<dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>3.2.14.RELEASE</version> </dependency>
Java项目中,启动Spring IoC、获取Bean
CLASS PATH下放一个最简单的Spring配置文件
<?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-3.0.xsd"> <bean id="demoBean" class="com.nicchagil.springapplication.No001initSpringIocAndGetABean.bean.DemoBean"> </bean> </beans>
需要由Spring托管的Bean Class
package com.nicchagil.springapplication.No001initSpringIocAndGetABean.bean; public class DemoBean { public String test() { return "hello spring..."; } }
调用类
package com.nicchagil.springapplication.No001initSpringIocAndGetABean; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.nicchagil.springapplication.No001initSpringIocAndGetABean.bean.DemoBean; public class Call { public static void main(String[] args) { ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml"); DemoBean d1 = context.getBean("demoBean", DemoBean.class); DemoBean d2 = context.getBean("demoBean", DemoBean.class); /* execu the method*/ System.out.println(d1.test()); System.out.println(d2.test()); /* default singleton */ System.out.println("demoBean isSingleton ? -> " + context.isSingleton("demoBean")); System.out.println(d1); System.out.println(d2); System.out.println("d1 == d2 -> " + (d1 == d2)); } }
日志
hello spring... hello spring... demoBean isSingleton ? -> true com.nicchagil.springapplication.No001initSpringIocAndGetABean.bean.DemoBean@4857b188 com.nicchagil.springapplication.No001initSpringIocAndGetABean.bean.DemoBean@4857b188 d1 == d2 -> true