Spring配置数据源

常见的数据源连接池:DBCP、C3P0、BoneCP、Druid等

1、C3P0

①导入数据源的坐标和数据库驱动坐标

<dependency>
   <groupId>c3p0</groupId>
   <artifactId>c3p0</artifactId>
   <version>0.9.1.2</version>
</dependency>
<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>5.1.47</version>
</dependency>

②创建连接池

  @Test
  public void test1() throws Exception {
        ComboPooledDataSource dataSource = new ComboPooledDataSource();
        dataSource.setDriverClass("com.mysql.jdbc.Driver");
        dataSource.setJdbcUrl("jdbc:mysql://172.16.90.174:3306/dbName");
        dataSource.setUser("root");
        dataSource.setPassword("123456");
        Connection connection = dataSource.getConnection();
        System.out.println(connection);
    }

1、Druid

①导入数据源的坐标和数据库驱动坐标

<dependency>
  <groupId>com.alibaba</groupId>
  <artifactId>druid</artifactId>
  <version>1.1.23</version>
</dependency>
<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>5.1.47</version>
</dependency>

②创建连接池

  @Test
    public void test2() throws Exception {
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName("com.mysql.jdbc.Driver");
        dataSource.setUrl("jdbc:mysql://172.16.90.174:3306/dbName");
        dataSource.setUsername("root");
        dataSource.setPassword("123456");
        Connection connection = dataSource.getConnection();
        System.out.println(connection);
    }

配置文件提取（jdbc.properties）

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://172.16.90.174:3306/dbName
jdbc.username=root
jdbc.password=123456

①代码方式

@Test
public void test3() throws Exception {
        ResourceBundle resourceBundle = ResourceBundle.getBundle("jdbc");
        String driver = resourceBundle.getString("jdbc.driver");
        String url = resourceBundle.getString("jdbc.url");
        String username = resourceBundle.getString("jdbc.username");
        String password = resourceBundle.getString("jdbc.password");

        ComboPooledDataSource dataSource = new ComboPooledDataSource();
        dataSource.setDriverClass(driver);
        dataSource.setJdbcUrl(url);
        dataSource.setUser(username);
        dataSource.setPassword(password);
        Connection connection = dataSource.getConnection();
        System.out.println(connection);
    }

②配置文件方式（applicationContext.xml）

<?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">
    <!-- 加载jdbc.properties配置文件--> 
    <context:property-placeholder location="classpath:jdbc.properties"/>

    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <!-- 指定连接数据库的驱动--> 
        <property name="driverClass" value="${jdbc.driver}"/>
        <!-- 指定连接数据库的URL-->  
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <!-- 指定连接数据库的用户名--> 
        <property name="user" value="${jdbc.username}"/>
        <!-- 指定连接数据库的密码-->  
        <property name="password" value="${jdbc.password}"/>
    </bean>
</beans>

③测试

@Test
public void test4() throws Exception {
    ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
    ComboPooledDataSource dataSource = (ComboPooledDataSource) context.getBean("dataSource");
    Connection connection = dataSource.getConnection();
    System.out.println(connection);
 }