Spring初学之使用外部配置文件dataSource

一、在Spring的基础上还要另外导入c3p0包和mysql的驱动包。

二、配置文件，

jdbc.propertices：这里只做了一些简单配置

user=root
password=123
driverClass=com.mysql.jdbc.Driver
jdbcUrl=jdbc\:mysql\:///test

三、spring配置文件：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">

<!-- 导入外部配置文件-->
<context:property-placeholder location="classpath:jdbc.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>

四、测试：

package spring.beans.properties.test;

import java.sql.SQLException;

import javax.sql.DataSource;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main {

    public static void main(String[] args) throws SQLException {
        ApplicationContext ctx=new ClassPathXmlApplicationContext("beans-properties.xml");

        DataSource dataSource=(DataSource) ctx.getBean("dataSource");
        System.out.println(dataSource.getConnection());
    }

}

五、输出

　　数据库中有对应数据库test，并配置成功，会输出

com.mchange.v2.c3p0.impl.NewProxyConnection@28ac3dc3