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  • spring之通过静态工厂方法配置Bean

    Car.java

    package com.gong.spring.beans.factory;
    
    public class Car {
        private String name;
        private double price;
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
        public double getPrice() {
            return price;
        }
        public void setPrice(double price) {
            this.price = price;
        }
        public Car(String name, double price) {
            super();
            this.name = name;
            this.price = price;
        }
        @Override
        public String toString() {
            return "Car [name=" + name + ", price=" + price + "]";
        }
        
    }

    StaticFactory.java

    package com.gong.spring.beans.factory;
    
    import java.util.HashMap;
    import java.util.Map;
    
    //静态工厂方法:直接调用一个类的静态工厂方法就可以返回Bean的实例
    public class StaticFactory {
        public static Map<String,Car> cars = new HashMap<String,Car>();
        static {
            cars.put("baoma",new Car("baoma",200000));
            cars.put("benchi",new Car("benchi",300000));
        }
        public static Car getCar(String name) {
            return cars.get(name);
        }
    }

    beans-factory.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">
    
        <!-- 通过静态工厂方法来配置Bean,不是配置静态工厂方法实例,而是配置Bean实例 -->
        <!-- class:指向静态工厂方法的全类名
             factory-method:指向静态工厂方法的名字
             constructor-arg:如果静态工厂方法需要传入参数,使用这个来配置参数 -->
        <bean id="car" class="com.gong.spring.beans.factory.StaticFactory" factory-method="getCar">
            <constructor-arg value="baoma"></constructor-arg>
        </bean>
    </beans>

    Main.java

    package com.gong.spring.beans.factory;
    
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class Main {
        public static void main(String[] args) {
            //1.创建spring的IOC容器对象
            ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("beans-factory.xml");
            //2.从容器中获取Bean实例
            Car car = (Car) ctx.getBean("car");
            System.out.println(car.toString());
            ctx.close();
        }
    }

    输出:

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  • 原文地址:https://www.cnblogs.com/xiximayou/p/12155856.html
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