spring 引入外部配置文件

beans-properties.xml

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

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

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

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

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

xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context/spring-context-4.0.xsd">

<!-- 配置数据源 -->

<!-- <bean id="dataS" class="com.mchange.v2.c3p0.ComboPooledDataSource">

<property name="user" value="root"></property>

<property name="password" value="123456"></property>

<property name="driverClass" value="com.mysql.jdbc.Driver"></property>

<property name="jdbcUrl" value="jdbc:mysql:///test"></property>

</bean> -->

<!-- 导入外部的资源文件 -->

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

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

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

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

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

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

</bean>

</beans>

外部文件为:db.properties

jdbc.user=root

jdbc.password=1230

jdbc.driverClass=com.mysql.jdbc.Driver

jdbc.jdbcUrl=jdbc:mysql:///test

测试类：

package com.spring.properties;

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 Exception {

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

DataSource source = (DataSource) ctx.getBean("dataS");

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

}

}