亲，求一份超市管理系统的源代码，只要源代码就行了

import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; public class Conn { private static final String driver="com.mysql.jdbc.Driver"; private static final String url="jdbc:mysql://localhost:3306/blog?user=root&password=root"; //获得数据库连接 public static Connection getConnection(){ Connection conn = null; try { Class.forName(driver); conn = DriverManager.getConnection(url); if(conn != null){ System.out.print("成功"); } } catch (SQLException e) { e.printStackTrace(); } catch (ClassNotFoundException e) { e.printStackTrace(); } return conn; } //关闭Resultset public static void closeResultSet(ResultSet rs) { try { if(rs != null) { rs.close(); } }catch (SQLException ex) { ex.printStackTrace(); } } //关闭Statement public static void closeStatement(Statement st) { try { if(st != null) { st.close(); } }catch (SQLException ex) { ex.printStackTrace(); } } //关闭Connection public static void closeConnection(Connection conn) { try { if(conn != null) { conn.close(); } }catch (SQLException ex) { ex.printStackTrace(); } } //测试数据库连接是否成功 public static void main(String[] args) { Conn.getConnection(); } }