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spring bean作用域

概要:

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实例代码具体解释:

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Car.java

package com.coslay.beans.autowire;

public class Car {
	private String brand;
	private double price;

	public String getBrand() {
		return brand;
	}

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

	public double getPrice() {
		return price;
	}

	public void setPrice(double price) {
		this.price = price;
	}

	@Override
	public String toString() {
		return "Car [brand=" + brand + ", price=" + price + "]";
	}
	
	public Car(){
		System.out.println("Car‘s Constructor...");
	}

}

Main.java

package com.coslay.beans.scope;

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

import com.coslay.beans.autowire.Car;

public class Main {
	public static void main(String[] args) {
		ApplicationContext ctx = new ClassPathXmlApplicationContext("beans-scope.xml");
		
		Car car = (Car) ctx.getBean("car");
		Car car2 = (Car) ctx.getBean("car");
		
		System.out.println(car == car2);
	}
}


beans-scope.xml
<?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">

	<!-- 
		使用bean的scope属性来配置bean的作用域
		singleton:默认值,容器初始化时创建bean实例,在整个容器的生命周期内仅仅创建这一个bean。单例的。
		prototype:原型的。容器初始化时不创建bean的实例。

而在每次请求时都创建一个新的Bean实例。并返回。

--> <bean id="car" class="com.coslay.beans.autowire.Car" scope="prototype"> <property name="brand" value="http://www.mamicode.com/Audi"></property> <property name="price" value="http://www.mamicode.com/300000000"></property> </bean> </beans>



spring bean作用域