验证Bean的singleton和portotype作用域

1.HelloWorld.java

package com.forcoldplay.spring.test02;

public class HelloWorld {
    private String message ;
    public void setMessage(String message) {
        this.message = message;
    }
    public String getMessage() {
        System.out.println("message : " + message);
        return message;
    }
}

2.MainApp.java

package com.forcoldplay.spring.test02;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MainApp {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("Beans.xml");
        HelloWorld obj1 = context.getBean("helloWorld02",HelloWorld.class);
        obj1.setMessage("I am object A");
        obj1.getMessage();
        HelloWorld obj2 = context.getBean("helloWorld02",HelloWorld.class);
        obj2.getMessage();
    }
}

3.配置文件，设作用域为原型模式

<?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="helloWorld" class="com.forcoldplay.spring.test.HelloWorld">
        <property name="message" value="Hello World!"/>
    </bean>
    <bean id="helloWorld02" class="com.forcoldplay.spring.test02.HelloWorld" scope="prototype">

    </bean>
</beans>

4.运行结果

message : I am object A
message : null

5.改为单例模式

<?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="helloWorld" class="com.forcoldplay.spring.test.HelloWorld">
        <property name="message" value="Hello World!"/>
    </bean>
    <bean id="helloWorld02" class="com.forcoldplay.spring.test02.HelloWorld" scope="singleton">

    </bean>
</beans>

运行结果为

message : I am object A
message : I am object A

其默认值为单例模式。