Druid连接池对象

配置文件

driverClassName=com.mysql.jdbc.Driver
url=jdbc:mysql://127.0.0.1:3306/db1
username=root
password=root
//初始化连接数量
initialSize=5
maxActive=10
//最大等待时间
maxWait=3000

定义一个JdbcPollutils类

public class JdbcPollutils {
    //定义成员变量
    private static DataSource dataSource;
    static {

        try {
            //加载配置文件
            Properties properties = new Properties();
            properties.load(JdbcPollutils.class.getClassLoader().getResourceAsStream("druid.properties"));
            //获取DataSource
            dataSource = DruidDataSourceFactory.createDataSource(properties);

        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    //获取连接
    public static Connection getConnection() throws SQLException{
        return dataSource.getConnection();
    }
    //释放资源
    public static void close(ResultSet resultSet, Statement statement, Connection connection){
        if(resultSet!=null){
            try {
                resultSet.close();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }
        if(statement!=null){
            try {
                statement.close();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }
        if(connection!=null){
            try {
                connection.close();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }
    }
    //获取连接池方法
    public static DataSource getDataSource(){
        return dataSource;
    }
}

 测试Druid连接池

public class DruidDemo2 {
    public static void main(String[] args) {
        //添加操作
        Connection connection =null;
        PreparedStatement preparedStatement=null;
        try {
            connection = JdbcPollutils.getConnection();
            String sql="insert into info values(null,?,?,?)";
            preparedStatement = connection.prepareStatement(sql);
            preparedStatement.setString(1,"wangwu");
            preparedStatement.setString(2,"男");
            preparedStatement.setString(3,"湖南");
            int i = preparedStatement.executeUpdate();
            System.out.println(i);
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }finally {
            //释放连接
            JdbcPollutils.close(null,preparedStatement,connection);
        }

    }
}