8.15
package com.zhongruan.service;
import com.zhongruan.bean.Music;
import com.zhongruan.dao.MusicDao;
import com.zhongruan.dao.UserDao;
import java.sql.SQLException;
import java.util.List;
import java.util.Scanner;
public class MusicService {
public static void main(String[] args) throws SQLException {
UserDao userDao = new UserDao();
MusicDao musicDao = new MusicDao();
while (true) {
System.out.println(“---------请输入用户名:---------”);
Scanner input = new Scanner(System.in);
String username = input.next();
System.out.println(“---------请输入密码:-----------”);
String password = input.next();
System.out.println(username + password);
boolean flag = userDao.login(username, password);
if (flag) {
System.out.println("*****------------登入成功------------*****");
System.out.println("*****------欢迎来到音乐管理系统------*****");
System.out.println("\t1.音乐管理\t2.用户管理\t3.退出系统");
int j = input.nextInt();
if (j == 1) {
System.out.println("*****------欢迎进入音乐管理系统------*****");
System.out.println("\t1.查询音乐\t2.添加音乐\t3.修改音乐\t4.删除音乐");
int a = input.nextInt();
switch (a) {
case 1: