【Spring】07 JDBC使用外部属性文件

JDBC 使用外部属性文件

• 先来下载几个jar
• db-properties(外部属性文件)
• beans-properties.xml
• Main.java(com.test.sping.beans.properties.Main)

先来下载几个jar

c3p0:JDBC DataSources
mysql-connector-java-5.1.47.zip
下好了放在lib文件夹里，idea中选中这些文件右击选择Add as Library

db-properties(外部属性文件)

user=root
password=123456
driverClass=com.mysql.jdbc.Driver
jdbcUrl=jdbc:mysql:///test

beans-properties.xml

<?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.xsd">

    <!-- 导入属性文件 -->
    <context:property-placeholder location="classpath:db-properties"></context:property-placeholder>

    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <!-- 使用外部化属性文件的属性 -->
        <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>

Main.java(com.test.sping.beans.properties.Main)

package com.test.sping.beans.properties;


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

import javax.sql.DataSource;
import java.sql.SQLException;

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());
    }

}

完事了…