public class User {public void add(){System.out.println("add.............");}public static void main(String[] args) {//原始做法User user = new User();user.add();}
}

<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="foo" class="x.y.Foo"><meta key="cacheName" value="foo"/><property name="name" value="Rick"/></bean></beans>

 <bean id="user" class="cn.itcast.ioc.User"></bean>

@Testpublic void testUser(){//1 加载spring配置文件，根据创建对象ApplicationContext context = new ClassPathXmlApplicationContext("bean1.xml");//得到配置创建的对象User user = (User)context.getBean("user");user.add();}

http://www.springframework.org/schema/beans/spring-beans.xsd

<bean id="user" class="cn.itcast.ioc.User"></bean>

public class Bean2Factory {//静态的方法，返回Bean2对象public static Bean2 getBean2(){return new Bean2();}
}

public class Bean2 {public void add() {System.out.println("bean2.............");}
}

<bean id="bean2" class="cn.itcast.bean.Bean2Factory" factory-method="getBean2"></bean>

@Testpublic void testUser(){//1 加载spring配置文件，根据创建对象ApplicationContext context = new ClassPathXmlApplicationContext("bean1.xml");//得到配置创建的对象/*User user = (User)context.getBean("user");user.add();*/Bean2 bean2 = (Bean2)context.getBean("bean2");System.out.println(bean2);bean2.add();}

<!-- 使用实例工厂创建对象 --> <!-- 创建工厂对象 --><bean id="bean3Factory" class="cn.itcast.bean.Bean3Factory"></bean><bean id="bean3" factory-bean="bean3Factory" factory-method="getBean3"></bean>

scope="prototype"

<bean id="demo1" class="cn.itcast.property.PropertyDemo1"><!-- 使用有参构造注入 --><constructor-arg name="username" value="hello"></constructor-arg></bean>

public class PropertyDemo1 {private String username;public PropertyDemo1(String username) {this.username = username;}public void test1(){System.out.println("demo1"+username);}
}

<bean id="book" class="cn.itcast.property.Book"><!-- 注入属性值name属性值：类里面定义的属性名称value属性值：设置具体的值--><property name="bookName" value="易经经"></property>
</bean>

public class Book {private String bookName;public void setBookName(String bookName) {this.bookName = bookName;}public void demobook(){System.out.println("book.............."+bookName);}
}

public class UserService {//1 定义dao类型属性private UserDao userDao;//生成set方法public void setUserDao(UserDao userDao) {this.userDao = userDao;}