将外部属性文件的数据配置到bean的配置文件，依赖于context标签下的property-placeholder标签

1、准备properties文件

url=jdbc:mysql://localhost:3306/hibernate_db
username=root
password=1111

2、编写对应实体类

package com.yl.bean;public class DataSource { private String url; private String username; private String password; public DataSource() { } public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } @Override public String toString() { return "DataSource{" + "url='" + url + '\'' + ", username='" + username + '\'' + ", password='" + password + '\'' + '}'; }}

3、spring配置文件

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://.yl.bean.DataSource;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class MainTest { public static void main(String[] args) { ApplicationContext applicationContext=new ClassPathXmlApplicationContext("bean1.xml"); DataSource dataSource= (DataSource) applicationContext.getBean("dataSource"); System.out.println(dataSource); }}

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