Spring学习-创建Bean的三种方式-优快云博客

本文链接：https://blog.youkuaiyun.com/pyzheng/article/details/83945675

本文通过具体代码示例介绍了Spring框架中三种不同的Bean实例化方式：构造器实例化、静态工厂方式实例化及实例工厂方式实例化，并展示了如何在Hibernate配置文件中定义这些实例化过程。

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MyTestInstance类


package com.app.impl;

public class MyTestInstance {

	private String testMessage;

	public MyTestInstance(){
		System.out.println("初始化我的MyTestInstance类.");
	}
	public void info(){
		System.out.println(this.getTestMessage());
	}

	public String getTestMessage() {
		return testMessage;
	}

	public void setTestMessage(String testMessage) {
		this.testMessage = testMessage;
	}


}

TestCreateInstance 类


package com.app.impl;

import com.app.ICreateInstance;

public class TestCreateInstance implements ICreateInstance {

	private String message;

	public TestCreateInstance(){
		System.out.println("使用构造器创建Bean实例");
	}
	public static MyTestInstance staticCreateInstance(){
		MyTestInstance instance = new MyTestInstance();
		System.out.println("使用静态工厂方法创建Bean");
		return instance;
	}
	public MyTestInstance createInstance(){
		MyTestInstance instance = new MyTestInstance();
		System.out.println("调用实例工厂方法创建Bean");
		return instance;
	}

	public void testService() {
		System.out.println("testService--------------");
	}

	public void setMessage(String message) {
		this.message = message;
	}
	public String getMessage() {
		return message;
	}




}

Hibernate.cfg.xml配置


<bean id="testCreateInstance1" class="com.app.impl.TestCreateInstance" p:message="我的哈哈">
	</bean>	
	<bean id="testCreateInstance2" class="com.app.impl.TestCreateInstance" 
		p:testMessage="不是哈哈1"
		factory-method="staticCreateInstance">
	</bean>
	<bean id="testCreateInstance3" factory-bean="testCreateInstance1"
		p:testMessage="不是哈哈2"
		factory-method="createInstance">
	</bean>

测试


public void testCreate(){
		ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");

		TestCreateInstance instance1 = ctx.getBean("testCreateInstance1",TestCreateInstance.class);
		instance1.testService();

		MyTestInstance instance2 = ctx.getBean("testCreateInstance2",MyTestInstance.class);
		instance2.info();

		MyTestInstance instance3 = ctx.getBean("testCreateInstance3",MyTestInstance.class);
		instance3.info();
	}

、
输出:
---------------------------------------------------
使用构造器创建Bean实例
初始化我的MyTestInstance类.
使用静态工厂方法创建Bean
初始化我的MyTestInstance类.
调用实例工厂方法创建Bean
testService--------------
不是哈哈1
不是哈哈2