Spring入门实例-bean初始化-beanfactorypostproperty

最新推荐文章于 2025-08-12 14:50:49 发布

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#spring #入门 #实例 #PropertyPlaceholderConfigurer #beanfactorypostproperty

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本文详细介绍了Spring入门实例中的BeanFactoryPostProcessor的使用方法，包括配置文件、bean定义、测试main方法及properties文件的应用。通过实例展示了如何使用PropertyPlaceholderConfigurer和PropertyOverrideConfigurer进行属性注入。

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Spring入门实例-beanfactorypostprocessor

实例：

配置文件：

<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-2.5.xsd">
	
	<bean id="configBean" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="location">
			<value>com/myspring/beanfacotrypostprocessor/hello.properties</value>
		</property>
	</bean>
	<!-- 
	<bean class="org.springframework.beans.factory.config.PropertyOverrideConfigurer">
		<property name="location">
			<value>com/myspring/beanfacotrypostprocessor/hello.properties</value>
		</property>
	</bean>
	 -->
	
	<bean id="helloBean" class="com.myspring.beanfacotrypostprocessor.PostBean">
		<property name="dbname">
			<value>oracle</value>
		</property>
	</bean>
	
	<bean id="helloBean2" class="com.myspring.beanfacotrypostprocessor.PostBean">
		<property name="dbname">
			<value>${db_mysql}</value>
		</property>
	</bean>

</beans>

在properties文件中，可以使用覆盖PropertyOverrideConfigurer，直接写helloBean.dbname="mysql"覆盖原值

或是使用PropertyPlaceholderConfigurer使用${db_mysql}，db_mysql="mysql"赋值dbname属性

properties文件：

helloBean.dbname=mysql
db_mysql=sqlserver

bean：

public class PostBean
{
	private String dbname;

	public void setDbname(String dbname)
	{
		this.dbname = dbname;
	}

	public String getDbname()
	{
		return dbname;
	}
}

测试main：

public class TestPropertyPost
{
	public static void main(String[] args)
	{
		ApplicationContext context = new ClassPathXmlApplicationContext("com/myspring/beanfacotrypostprocessor/propertypostxml.xml");
		PostBean pb =  (PostBean) context.getBean("helloBean2");
		System.out.println(pb.getDbname());
	}
}