public void test01() throws Exception{
        // 1. 創(chuàng)建一個(gè)Properties對(duì)象，讓其去讀取druid.properties文件
        Properties properties = new Properties();

        // 1.1.1 將druid.properties配置文件轉(zhuǎn)成字節(jié)輸入流
        // FileInputStream is = new FileInputStream("E:\\java\\project202302\\module19-day26\\resources\\druid.properties");
        // 1.1.2 或者用使用相對(duì)路徑來將配置文件轉(zhuǎn)成字節(jié)輸入流,我們可以使用類加載器來讀取類路徑下文件
        InputStream is = DataSourceTest.class.getClassLoader().getResourceAsStream("druid.properties");

        // 1.2 使用properties對(duì)象加載流
        properties.load(is);

        // 2. 使用DruidDataSourceFactory創(chuàng)建Druid連接池對(duì)象
        DataSource dataSource = DruidDataSourceFactory.createDataSource(properties);

        //3. 從連接池中取出一個(gè)連接使用 ，本來設(shè)置最大連接數(shù)量是10，超過10個(gè)會(huì)報(bào)錯(cuò)
        Connection connection1 = dataSource.getConnection();
        Connection connection2 = dataSource.getConnection();
        Connection connection3 = dataSource.getConnection();
        Connection connection4 = dataSource.getConnection();
        Connection connection5 = dataSource.getConnection();
        Connection connection6 = dataSource.getConnection();
        Connection connection7 = dataSource.getConnection();
        Connection connection8 = dataSource.getConnection();
        Connection connection9 = dataSource.getConnection();
        //歸還一個(gè)連接: 沒有使用連接池的時(shí)候connection.close()就是銷毀連接，如果是從連接池中取出的connection對(duì)象它調(diào)用close()方法就是將連接歸還回連接池
        //底層原理是動(dòng)態(tài)代理
        connection1.close();

        Connection connection10 = dataSource.getConnection();
        Connection connection11 = dataSource.getConnection();
    }