Spring配置数据源

//dataSource.java
package spring_ioc_anno;

import java.beans.PropertyVetoException;
import java.sql.Connection;
import java.util.ResourceBundle;

import javax.sql.DataSource;

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

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.pool.DruidPooledConnection;
import com.mchange.v2.c3p0.ComboPooledDataSource;


public class DataSourceTest {
    
    
    @Test
    //测试手动创建c3p0数据源
    public void test1() throws Exception {
        ComboPooledDataSource dataSource = new ComboPooledDataSource(); 
        dataSource.setDriverClass("com.mysql.jdbc.Driver");
        dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/db3");
        dataSource.setUser("root");
        dataSource.setPassword("001224");
        Connection connection = dataSource.getConnection();
        System.out.println(connection);
        connection.close();
    }
    
    @Test
    //测试手动创建druid数据源
    public void test2() throws Exception {
        DruidDataSource dataSource = new DruidDataSource(); 
        dataSource.setDriverClassName("com.mysql.jdbc.Driver");
        dataSource.setUrl("jdbc:mysql://localhost:3306/db3");
        dataSource.setUsername("root");
        dataSource.setPassword("001224");
        DruidPooledConnection connection = dataSource.getConnection();
        System.out.println(connection);
        connection.close();
    }
    
    @Test
    //测试手动创建c3p0数据源(加载properties配置文件形式)
    public void test3() throws Exception {
        //读取配置文件
        ResourceBundle rb = ResourceBundle.getBundle("jdbc");
        String driver = rb.getString("jdbc.driver");
        String url = rb.getString("jdbc.url");
        String username = rb.getString("jdbc.username");
        String password = rb.getString("jdbc.password");
        //创建数据源对象，设置连接参数
        ComboPooledDataSource dataSource = new ComboPooledDataSource();
        dataSource.setDriverClass(driver);
        dataSource.setJdbcUrl(url);
        dataSource.setUser(username);
        dataSource.setPassword(password);
        Connection connection = dataSource.getConnection();
        System.out.println(connection);
        connection.close();
    }
    
    @Test
    //测试Spring容器产生c3p0数据源对象
    public void test4() throws Exception{
        ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");
        DataSource dataSource = app.getBean(DataSource.class);
        Connection connection = dataSource.getConnection();
        System.out.println(connection);
        connection.close();
    }
    
    
}

jdbc.driver = com.mysql.jdbc.Driver
jdbc.url = jdbc:mysql://localhost:3306/db3
jdbc.username = root
jdbc.password = 001224

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    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 http://www.springframework.org/schema/context/spring-context.xsd">


    <!-- 加载外部的properties文件 -->
    <context:property-placeholder location="classpath:jdbc.properties"/>
    
    
    <bean id = "dataSource" class = "com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"></property>
        <property name="jdbcUrl" value="${jdbc.url}"></property>
        <property name="user" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>
    
    
</beans>