druid和hikariCP 数据库连接池 druid 首先需要导入druid的jar包 Properties properties = new Properties(); FileInputStream fileInputStream = new FileInputStream("src/com/jdbc/druid/druid.properties"); properties.load(fileInputStream); DataSource dataSource = DruidDataSourceFactory.createDataSource(properties); Connection connection = dataSource.getConnection(); String sql = "select * from student"; PreparedStatement statement =connection.prepareStatement(sql); ResultSet resultSet = statement.executeQuery(); while(resultSet.next()){ System.out.println(resultSet.getString("stuno")); System.out.println(resultSet.getString("stuname")); System.out.println("--------------------"); } connection.close();     其中导入的数据properties文件内容如下 url=jdbc:mysql://localhost:3306/orcl username=root password=123456 其中配置参数都可以在druid中的gitHub中找到相应的参数   hikariCP HikariConfig config = new HikariConfig(); config.setJdbcUrl("jdbc:mysql://localhost:3306/orcl"); config.setUsername("root"); config.setPassword("123456"); HikariDataSource ds = new HikariDataSource(config); Connection connection = ds.getConnection(); String sql ="select * from student"; PreparedStatement statement =connection.prepareStatement(sql); ResultSet resultSet = statement.executeQuery(); while(resultSet.next()){ System.out.println(resultSet.getString("stuno")); System.out.println(resultSet.getString("stuname")); System.out.println("--------------------"); } connection.close(); 连接方法有很多种可以在GitHub中查看