Spring - Bean管理之三种实例化Bean的方式（XML）

packagecom.imooc.ioc.demo2;
/*** Bean的实例化的三种方式：采用无参数的构造方法的方式*/publicclassBean1 {
publicBean1(){
System.out.println("Bean1被实例化了...");
    }
}

packagecom.imooc.ioc.demo2;
/*** Bean的实例化三种方式：静态工厂实例化方式*/publicclassBean2 {
}
packagecom.imooc.ioc.demo2;
/*** Bean2的静态工厂*/publicclassBean2Factory {
publicstaticBean2createBean2(){
System.out.println("Bean2Factory的方法已经执行了...");
returnnewBean2();
    }
}

packagecom.imooc.ioc.demo2;
/*** Bean的实例化三种方式：实例工厂实例化*/publicclassBean3 {
}
packagecom.imooc.ioc.demo2;
/*** Bean3的实例工厂*/publicclassBean3Factory {
publicBean3createBean3(){
System.out.println("Bean3Factory执行了...");
returnnewBean3();
    }
}

<!--第一种：无参构造器的方式--><beanid="bean1"class="com.imooc.ioc.demo2.Bean1"/><!--第二种：静态工厂的方式--><beanid="bean2"class="com.imooc.ioc.demo2.Bean2Factory"factory-method="createBean2"/><!--第三种：实例工厂的方式--><beanid="bean3Factory"class="com.imooc.ioc.demo2.Bean3Factory"/><beanid="bean3"factory-bean="bean3Factory"factory-method="createBean3"/>

packagecom.imooc.ioc.demo2;
importorg.junit.Test;
importorg.springframework.context.ApplicationContext;
importorg.springframework.context.support.ClassPathXmlApplicationContext;
/*** Bean的实例化的三种方式*/publicclassSpringDemo2 {
@Testpublicvoiddemo1(){
// 创建工厂ApplicationContextapplicationContext=newClassPathXmlApplicationContext("applicationContext.xml");
// 通过工厂获得类的实例:Bean1bean1= (Bean1)applicationContext.getBean("bean1");
    }
@Testpublicvoiddemo2(){
// 创建工厂ApplicationContextapplicationContext=newClassPathXmlApplicationContext("applicationContext.xml");
// 通过工厂获得类的实例:Bean2bean2= (Bean2)applicationContext.getBean("bean2");
    }
@Testpublicvoiddemo3(){
// 创建工厂ApplicationContextapplicationContext=newClassPathXmlApplicationContext("applicationContext.xml");
// 通过工厂获得类的实例:Bean3bean3= (Bean3)applicationContext.getBean("bean3");
    }
}