package cn.itcast.utils;import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;import java.util.ResourceBundle;public class DbUtil {        private static String className = null;    private static String connUrl = null;    private static String userName = null;    private static String password = null;        //类加载时初始化静态数据    static{        ResourceBundle resbe = ResourceBundle.getBundle("jdbc");        className = resbe.getString("className");        connUrl = resbe.getString("connUrl");        userName = resbe.getString("userName");        password = resbe.getString("password");        initDriver();    }        /**     * 获取数据库连接接口     * @return     */    public static Connection getConnection(){                try {            return DriverManager.getConnection(connUrl, userName, password);        } catch (SQLException e) {            e.printStackTrace();        }        return null;            }        /**     * 初始化数据库驱动     */    public static void initDriver(){        try {            Class.forName(className);        } catch (ClassNotFoundException e) {            e.printStackTrace();        }    }        /**     * 释放对象内存     * @param rs ResultSet     * @param st Statement     * @param conn Connection     */    public static void release(ResultSet rs,Statement st,Connection conn){        if(rs!=null){            try {                rs.close();            } catch (SQLException e) {                e.printStackTrace();            }            rs = null;        }        if(st!=null){            try {                st.close();            } catch (SQLException e) {                e.printStackTrace();            }            st = null;        }        if(conn!=null){            try {                conn.close();            } catch (SQLException e) {                e.printStackTrace();            }        }    }}