DruidUtils(druid的工具类)

/**
 * druid连接池的工具类
 */
public class DruidUtils {

    //定义成员变量 DataSource
    private static DataSource ds;

    static {
        try {
            //加载配置文件
            //创建Properties类
            Properties pro = new Properties();
            //加载文件
            pro.load(DruidDemo.class.getClassLoader().getResourceAsStream("druid.properties"));
            //获取连接池对象
            ds = DruidDataSourceFactory.createDataSource(pro);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 获取Connection对象,数据库连接对象
     * @return
     * @throws SQLException
     */
    public static Connection getConnection() throws SQLException {
        return ds.getConnection();
    }

    /**
     * 归还连接
     * @param stmt
     * @param conn
     */
    public static void close(Statement stmt, Connection conn) {
        close(null,stmt,conn);
    }

    public static void close(ResultSet rs,Statement stmt, Connection conn) {
        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        if (stmt != null) {
            try {
                stmt.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * 获取数据库连接池对象
     * @return
     */
    public static DataSource getDataSource(){
        return ds;
    }
}