spring实例化工厂和静态工厂的详细!!

1.静态/实例工厂

静态工厂：
就是生成实例对象，所有的方法必须是static
实例工厂：
就是先创建类对象，通过对象来调用创建实例对象的方法

---

静态工厂创建的方法必须是静态方法

2.代码执行：

1.静态

package com.briup.util;

import com.briup.service.UserServiceImpl;
/**
 * 静态方法
 * 静态工厂
 */
public class mybeanfactory {
	
	public static UserServiceImpl getUserService() {
		return new UserServiceImpl();
	}
}

2.非静态

package com.briup.util;

import com.briup.service.UserServiceImpl;
/*
实例工厂
非静态方法
*/
public class mybeanfactory2 {
	public  UserServiceImpl createService() {
		return new UserServiceImpl();
	}
}

3.bean.xml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">
<!-- 测试静态工厂 -->
<bean id="UserService" class="com.briup.util.mybeanfactory" factory-method="getUserService">
</bean>

<!--  测试实例工厂-->
<bean id="mybeanfactory2" class="com.briup.util.mybeanfactory2"></bean>
<bean id="userService2" factory-bean="mybeanfactory2"  factory-method="createService"></bean>

<!-- 测试 factorybean-->
<bean id="factorybean" class="com.briup.util.beanFactoryTest"></bean>
</beans>

4.test文件测试：

！！！

package com.briup.test;

import org.junit.Test;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.briup.pojo.User;
import com.briup.service.UserServiceImpl;

public class UserServiceTest {

@Test
	public void  test1() {
		
		ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("bean2.xml");
		UserServiceImpl bean = (UserServiceImpl) applicationContext.getBean("userService2");
		//bean.addUser();
		System.out.println(bean);
	}
	
	@Test
	public void test2() {
		
		ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("bean2.xml");
		UserServiceImpl u =(UserServiceImpl) applicationContext.getBean("factorybean");
		System.out.println(u);
	}
	@Test
	public void test3() {
		
		ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("bean3.xml");
		User u =(User) applicationContext.getBean("UserId");
		System.out.println(u);
	}
	}