SpringIOC控制反转(依赖注入)创建对象的方式

Class c &＃61; Class .forName("类的全路径名称")Object obj &＃61; c.newInstance()

package cn.tedu.beans;public class Person {public Person(String str) {System.out.println("有参构造 ~~~");}public void say() {System.out.println("person hello spring ~~~");}
}

&＃64;Test/*** SpringIOC 创建对象方式 1 - 通过无参构造方法创建对象*/public void test4(){/**/ApplicationContext context &＃61; new ClassPathXmlApplicationContext("applicationContext.xml");// 通过id获取Person p &＃61; (Person) context.getBean("person");p.say();}

package cn.tedu.factory;import java.util.Calendar;public class CalendarStaticFactory {public static Calendar getInstance(){return Calendar.getInstance();}
}

xml version&＃61;"1.0" encoding&＃61;"UTF-8"?>
<beans xmlns&＃61;"http://www.springframework.org/schema/beans" xmlns:xsi&＃61;"http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation&＃61;"http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd"><bean id&＃61;"calendar" class&＃61;"cn.tedu.factory.CalendarStaticFactory" factory-method&＃61;"getCalendar">bean>beans>

&＃64;Test/*** SpringIOC 创建对象方式 2 - 静态工厂*/public void test5(){ApplicationContext context &＃61; new ClassPathXmlApplicationContext("applicationContext.xml");// 通过id获取Calendar calendar &＃61; (Calendar) context.getBean("calendar");System.out.println(calendar);}

package cn.tedu.factory;import java.util.Calendar;public class CalendarFactory {public Calendar getCalendar(){return Calendar.getInstance();}
}

xml version&＃61;"1.0" encoding&＃61;"UTF-8"?>
<beans xmlns&＃61;"http://www.springframework.org/schema/beans" xmlns:xsi&＃61;"http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation&＃61;"http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd"><bean id&＃61;"calendarFactory" class&＃61;"cn.tedu.factory.CalendarFactory">bean><bean id&＃61;"calendar" factory-bean&＃61;"calendarFactory" factory-method&＃61;"getCalendar">bean>beans>

&＃64;Test/*** Spring 创建对象方式3 - 实例工厂*/public void test7(){ApplicationContext context &＃61; new ClassPathXmlApplicationContext("applicationContext.xml");Calendar calendar &＃61; (Calendar) context.getBean("calendar");System.out.println(calendar);}

package cn.tedu.factory;import java.util.Calendar;import org.springframework.beans.factory.FactoryBean;public class CalendarSpringFactory implements FactoryBean {/*** Spring工厂生产对象的方法*/&＃64;Overridepublic Calendar getObject() throws Exception {return Calendar.getInstance();}/*** 获取当前工厂生产的对象的类型的方法*/&＃64;Overridepublic Class getObjectType() {return Calendar.class;}/*** Spring工厂生产对象时是否采用单例模式* 如果返回true&＃xff0c;则在spring中该对象只创建一次&＃xff0c;后续重复使用* 如果返回false,则每次获取该bean都重新创建对象*/&＃64;Overridepublic boolean isSingleton() {return true;}
}

xml version&＃61;"1.0" encoding&＃61;"UTF-8"?>
<beans xmlns&＃61;"http://www.springframework.org/schema/beans" xmlns:xsi&＃61;"http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation&＃61;"http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd"><bean id&＃61;"calendar" class&＃61;"cn.tedu.factory.CalendarSpringFactory">bean>beans>

&＃64;Test/*** SpringIOC 创建对象方式 3 - spring工厂*/public void test6(){ApplicationContext context &＃61; new ClassPathXmlApplicationContext("applicationContext.xml");// 通过id获取Calendar calendar &＃61; (Calendar) context.getBean("calendar");System.out.println(calendar);}