Spring阶段性学习总结（七）引用properties文件的属性

<?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">
    <!--引入外部文件-->
    <context:property-placeholder location="classpath:db.properties"></context:property-placeholder>

    <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>

package SpringProperties;

import org.springframework.context.support.ClassPathXmlApplicationContext;

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

public class Main {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("SpringProperties/beans-properties.xml");
        DataSource datasource = (DataSource) ctx.getBean("datasource");
        try {
            System.out.println(datasource.getConnection());
        } catch (SQLException e) {
            e.printStackTrace();
        }

    }
}