Spring：IOC—控制反转（4）-优快云博客

本文链接：https://blog.youkuaiyun.com/oosocool/article/details/72780912

本文介绍Spring框架中通过静态工厂和动态工厂方法创建IOC容器管理对象的过程。包括如何定义工厂类及配置XML文件来实现对象实例化，并展示了最终的运行效果。

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IOC创建对象的三种方法
第三种：通过工厂的方法创建对象（不多用..）

1.静态工厂
创建一个工厂类：Factory.java

package com.et.factory;

import com.et.bean.Hello;

public class Factory {

    public static Hello newInstance(String name){
        return new Hello(name);
    }

}

beans.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">

        <bean id="hello" class="com.et.factory.Factory" factory-method="newInstance">
            <constructor-arg index="0" value="elliott"/>
        </bean>

</beans>

2.动态工厂
创建一个动态工厂类DynamicFactory .java

package com.et.factory;

import com.et.bean.Hello;

    public class DynamicFactory {
        public Hello newInstance(String name){
            return new Hello(name);
        }

}

beans.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">

        <bean id="helloFactory" class="com.et.factory.DynamicFactory"></bean>
        <bean id="hello" factory-bean="helloFactory" factory-method="newInstance">
            <constructor-arg index="0" value="elliott"/>
        </bean>

</beans>

两者Hello.java

package com.et.bean;

public class Hello {

    private String name;

    public Hello(String name){
        super();
        this.name=name;
    }

    public void show(){
        System.out.println("hello,"+name);
    }

}

两者test.java

package com.et.test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.et.bean.Hello;

public class Test {
    public static void main(String[] args) {
        ApplicationContext act=new ClassPathXmlApplicationContext("beans.xml");
        Hello hello=(Hello)act.getBean("hello");
        hello.show();
    }
}

都输出结果：
hello,elliott