import java.sql.Connection;import java.sql.DriverManager;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException; public class DBUtils {private static final String URL="jdbc:mysql://localhost:3306/jdbc?characterEncoding=utf-8";private static final String UER_NAME = "root";private static final String PDW="123123";private static DBUtils me = new DBUtils();public static DBUtils getInstance(){return me;}//为了是单例模式成为唯一可以获取该对象的方法，将该类的无参构造函数设为私有private DBUtils(){}public Connection getConn(){Connection conn = null;try {Class.forName("com.mysql.jdbc.Driver");conn = DriverManager.getConnection(URL, UER_NAME,PDW);} catch (ClassNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}return conn;}public void releaseRes(Connection conn,PreparedStatement pstmt,ResultSet rs){try {if(conn!=null) conn.close();if(pstmt!=null) pstmt.close();if(rs!=null) rs.close();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}