Spring2.5学习笔记1-控制反转-元素及配置

一、外在参数配置
通过PropertyPlaceholderConfiger和PropertyOverideConfigurer对象可以实现外在配置,他们实现了BeanFactoryPostProcessor接口。

PropertyPlaceholderConfiger
#userinfo.properties
#username=scott
passwd=tiger

System.setProperty("username", "sys_username");
ApplicationContext acc = new ClassPathXmlApplicationContext(
"config.xml");
GenericBeanFactoryAccessor gbfa = new GenericBeanFactoryAccessor(acc);
log.info("========外在参数配置========");
UserInfo user1 =gbfa.getBean("user1");
log.info("user1.name="+user1.getUserName());
log.info("user1.passwd="+user1.getPasswd());

class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">


userinfo.properties

PropertyOverideConfigurer

#override.properties
userInfo.userName=overideUserName
#userInfo.passwd=overrideUserPasswd

UserInfo userInfo =gbfa.getBean("userInfo");
log.info("userInfo.name="+userInfo.getUserName());
log.info("userInfo.passwd="+userInfo.getPasswd());

class="org.springframework.beans.factory.config.PropertyOverrideConfigurer">

override.properties

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