druid.properties

url=jdbc:mysql://localhost:3306/demo?useUnicode=true&&characterEncodeing=UTF-8&&useSSL=false&&serverTimezone=GMT&&rwriteBatchedStatments=true
username=root
password=123456
driverClassName=com.mysql.cj.jdbc.Driver
#<!-- 初始化连接 -->
initialSize=10
#最大连接数量
maxActive=50
#<!-- 最小空闲连接 -->
minIdle=5
#<!-- 超时等待时间以毫秒为单位 6000毫秒/1000等于60秒 -->
maxWait=6000

test.java

    @Test
    public void getConn() throws Exception {
        Properties pros = new Properties();
        InputStream is = ClassLoader.getSystemClassLoader().getResourceAsStream("druid.properties");
        pros.load(is);
        DataSource source = DruidDataSourceFactory.createDataSource(pros);
        Connection conn = source.getConnection();
        System.out.println(conn);
    }