spring 作用域之单例模式/原型模型

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1.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.xsd">


<bean id="car" class="com.hxzy.model.Car" scope="singleton">
<property name="brand" value="bmw"></property>
<property name="address" value="天津"></property>
<property name="speed" value="220"></property>
</bean>

</beans>

2.Car类

package com.hxzy.model;

public class Car {

private String brand;
private String address;
private int speed;

public void setBrand(String brand) {
this.brand = brand;
}

public void setAddress(String address) {
this.address = address;
}

public void setSpeed(int speed) {
this.speed = speed;
}

public Car() {

}

public Car(String brand, String address, int speed) {
super();
this.brand = brand;
this.address = address;
this.speed = speed;
}

@Override
public String toString() {
return "brand : " + brand + " address : " + address + " speed : " + speed;
}

}

3.测试类

AbstractApplicationContext ctx = new ClassPathXmlApplicationContext("spring_scope.xml");

Car car = (Car) ctx.getBean("car");
//System.out.println(car);

Car car2 = (Car) ctx.getBean("car");

System.out.println(car == car2);
ctx.close();

输出时结果为true，因为使用了单例模式获取car和car2

若改为使用 <bean id="car" class="com.hxzy.model.Car" scope="prototype">

则输出为false

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