先導入C3P0數據源

1.新建db.properties

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

2.新建XML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.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd"><!-- 導入屬性文件 --><context:property-placeholder location="classpath:db.properties"/><bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"><!-- 使用外部屬性化文件的屬性 --><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>

3.測試類Main

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

4.輸出結果

log4j:WARN No appenders could be found for logger (org.springframework.core.env.StandardEnvironment). log4j:WARN Please initialize the log4j system properly. log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info. com.mchange.v2.c3p0.impl.NewProxyConnection@6a510e39

只要能打印出上述結果，則說明數據庫連接沒問題

轉載于:https://www.cnblogs.com/sdnu-zhang/p/8527966.html

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