Spring通过c3p0配置bean连接数据库

2019-11-26 08:42:04

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来源：转载

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Spring配置bean连接数据库两种方法：

（1）直接在.xml文件内部配置：

<?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">   <!-- 配置链接数据库 --> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="user" value="root"></property> <property name="password" value="wangjian"></property> <property name="driverClass" value="com.mysql.jdbc.Driver"></property> <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false"></property> </bean> </beans>

（2）将参数放在外部文件中，然后再读入配置文件：

<?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">  <!-- 导入属性文件 -->  <context:property-placeholder location="classpath:db.properties" /> <!-- 使用外部化属性文件的属性 --> <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>

外部的配置文件：

user=rootpassword=wangjiandriverclass=com.mysql.jdbc.Driverjdbcurl=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false

测试函数：

package com.primary.spring.beans.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 SQLException {  ApplicationContext ctx = new ClassPathXmlApplicationContext("beans-properties.xml");  DataSource dataSource = (DataSource) ctx.getBean("dataSource"); System.out.println(dataSource.getConnection());  }}

测试结果：