用实例工厂的方法实例化bean

在实例化bean时，除了setter,constructor方法外，还有实例工厂方法，和静态工厂方法。

看代码：

People类的代码如下：

package com.timo.domain;

public class People {
    private String name;
    private Integer age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}

//工厂方法如下：

package com.timo.domain;

public class PeopleFactory {
    private static People people=new People();
    //this is non-static method.
    public People createPeopleInstance(){
        return  people;
    }
}

配置文件

applicationContext-instance-factory.xml

如下：

<?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">
    <import resource="applicationContext.xml"/>
    <import resource="applicationContext2.xml"/>
    <bean id="peopleFactory" class="com.timo.domain.PeopleFactory"></bean>
    <bean id="people" factory-bean="peopleFactory" factory-method="createPeopleInstance">
        <property name="name" value="曹操"/>
        <property name="age" value=""/>
      </bean>

    <!-- more bean definitions go here -->

</beans>

测试类如下：

package com.timo.test;

import com.timo.domain.People;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Test5 {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext-instance-factory.xml");
        People people = applicationContext.getBean(People.class);
        System.out.println("name="+people.getName()+" age="+people.getAge());
    }
}