<?xml version="1.0" encoding="UTF-8"?>

<beans

    xmlns="http://www.springframework.org/schema/beans"

    xmlns:context="http://www.springframework.org/schema/context"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xmlns:p="http://www.springframework.org/schema/p"

    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

    <context:property-placeholder location="classpath:db.properties"/>

    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">

        <property name="user" value="${user}"></property>

        <property name="password" value="${password}"></property>

        <property name="driverClass" value="${driverclass}"></property>

        <property name="jdbcUrl" value="${jdbcurl}"></property>

    </bean>

</beans>

user=root

password=admin

driverclass=com.mysql.jdbc.Driver

jdbcUrl=jdbc:mysql:///authority

package com.spring.properties;

import java.sql.SQLException;

import javax.sql.DataSource;

import org.springframework.context.*;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main {

    public static void main(String[] args) throws SQLException {

        ApplicationContext ctx = new ClassPathXmlApplicationContext("bean-properties.xml");

        DataSource dataSource = (DataSource)ctx.getBean("dataSource");

        System.out.println(dataSource.getConnection());

    }

}