Spring的配置数据源连接数据库

导入数据源的坐标和数据库驱动坐标创建数据源对象设置数据源的基本连接数据使用数据源获取连接资源和归还连接资源

public class DataSourceText {

    //测试手动创建c3p0数据源
    @Test
    public void test1() throws Exception {
        ComboPooledDataSource dataSource= new ComboPooledDataSource();
        dataSource.setDriverClass("com.mysql.cj.jdbc.Driver");
        dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/text01");
        dataSource.setUser("root");
        dataSource.setPassword("root");
        Connection connection = dataSource.getConnection();
        System.out.println(connection);
        connection.close();

        
    }
    
    //测试手动创建driud数据源
    @Test
    public void test02() throws SQLException {
        DruidDataSource dataSource =new DruidDataSource();
        dataSource.setDriverClassName("com.mysql.cj.jdbc.Driver");
        dataSource.setUrl("jdbc:mysql://localhost:3306/text01");
        dataSource.setUsername("root");
        dataSource.setPassword("root");

        DruidPooledConnection connection=dataSource.getConnection();
        System.out.println(connection);
        connection.close();

    }
}

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/text01
jdbc.username=root
jdbc.password=root

public class DataSourceText {

    //测试手动创建c3p0数据源
    @Test
    public void test1() 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
        ComboPooledDataSource dataSource=new ComboPooledDataSource();
        dataSource.setPassword(password);
        dataSource.setJdbcUrl(url);
        dataSource.setUser(username);
        dataSource.setDriverClass(driver);

        //创建连接对象
        Connection connection=dataSource.getConnection();
        System.out.println(connection);
        connection.close();
    }

  
}

注入

 //Spring容器产生数据源对象
    @Test
    public void test03() throws SQLException {
        ApplicationContext app=new ClassPathXmlApplicationContext("applicationContext.xml");
        DataSource dataSource = (DataSource) app.getBean("dataSource");
        Connection connection = dataSource.getConnection();
        System.out.println(connection);
        connection.close();
    }

在 applicationContext.xml 文件中，加载properties 文件  实现对jdbc.properties 的抽取

 在原来的基础上添加了

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

 http://www.springframework.org/schema/context  http://www.springframework.org/schema/context/spring-context.xsd