jdbc连接数据库

package com.lxj.db;import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.Statement;public class DBUtil {    public static final String URL = "jdbc:mysql://127.0.0.1:3306/javatest";    public static final String USER = "root";    public static final String PASSWORD = "root";    public static void main(String args[]) throws Exception{        //下载mysql-java驱动        //1.加载驱动        Class.forName("com.mysql.jdbc.Driver");        //2.获得数据库连接        Connection conn = DriverManager.getConnection(URL, USER, PASSWORD);        //3.操作数据库        Statement stmt = conn.createStatement();        String sql = "select id,user_name,sex,age,birthday from goddess";        ResultSet rs =  stmt.executeQuery(sql);        while(rs.next()){            System.out.println(rs.getInt("id"));            System.out.println(rs.getString("user_name"));        }    }}