2019.08.19
作者：互联网
2019.08.19
①完成音乐管理系统权限操作
package Music.ruanjian.service;
//import com.app.dao.UserDao;
import Music.ruanjian.bean.Music;
import Music.ruanjian.bean.User;
import Music.ruanjian.dao.MusicDao;
import Music.ruanjian.dao.UserDao;
import Music.ruanjian.util.DBUtil;
import com.sun.deploy.util.SyncAccess;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
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();
MusicService musicService = new MusicService();
boolean flag = true;
while (flag) {
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("|------------------------用户名:" + username + " 密码:" + password + "-----------------------|");
System.out.println("|-------------------------请输入角色:---------------------------|");
int type = input.nextInt();
User user=userdao.login(username, password);
if (user!=null) {
musicService.getMenu(user);
} else {
musicService.register();
}
}
}
public void getMenu(User user) throws SQLException {
MusicDao musicDao = new MusicDao();
UserDao userDao=new UserDao();
Scanner input = new Scanner(System.in);
System.out.println("|---------------------------登录成功----------------------------|");
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\t5.返回上一层|");
int a = input.nextInt();
switch (a) {
case 1:
List<Music> musics = musicDao.findAll();
System.out.println(musics);
System.out.println("|---------------------1.退出 0.返回上一级---------------------|");
int x = input.nextInt();
if (x==1) {
System.exit(0);
}else{
getMenu(user);
}
break;
case 2:
if(user.getType()!=0){
System.out.println("|---------------------你没有权限进行该操作!---------------------|");
System.out.println("|--------------------------返回上一级!-------------------------|");
getMenu(user);
break;
}
System.out.println("|--------------------请输入要添加歌曲的名称:--------------------|");
String n = input.next();
System.out.println("|--------------------请输入要添加歌曲的作者:--------------------|");
String au = input.next();
Music music = new Music();
music.setMusicname(n);
music.setAuthor(au);
musicDao.add(n, au);
System.out.println("|---------------------1.退出 0.返回上一级---------------------|");
int y = input.nextInt();
if (y==1) {
System.exit(0);
}else{
getMenu(user);
}
break;
case 3:
if (musicDao.modify()) {
System.out.println("|--------------------------修改成功!---------------------------|");
} else {
System.out.println("|--------------------------修改失败!---------------------------|");
}
System.out.println("|---------------------1.退出 0.返回上一级---------------------|");
int z = input.nextInt();
if (z==1) {
System.exit(0);
}else{
getMenu(user);
}
break;
case 4:
if(user.getType()!=0){
System.out.println("|---------------------你没有权限进行该操作!---------------------|");
System.out.println("|--------------------------返回上一级!-------------------------|");
getMenu(user);
break;
}
System.out.println("|---------------------请输入要删除歌曲的id:---------------------|");
int id = input.nextInt();
musicDao.delete(id);
System.out.println("|---------------------1.退出 0.返回上一级---------------------|");
int o = input.nextInt();
if (o==1) {
System.exit(0);
}else{
getMenu(user);
}
break;
case 5:
getMenu(user);
break;
}
} else if (j == 2) {
System.out.println("|---------------------欢迎进入用户管理系统----------------------|");
System.out.println("|\t1.查询用户\t2.添加用户\t3.修改用户\t4.删除用户\t5.返回上一层|");
int a = input.nextInt();
switch (a){
case 1:
List<User> users=userDao.findAll();
System.out.println(users);
System.out.println("|---------------------1.退出 0.返回上一级---------------------|");
int x = input.nextInt();
if (x==1) {
System.exit(0);
}else{
getMenu(user);
}
break;
case 2:
System.out.println("|--------------------请输入要添加用户的id:--------------------|");
int id = input.nextInt();
System.out.println("|--------------------请输入要添加用户的密码:--------------------|");
String pa = input.next();
System.out.println("|--------------------请输入要添加用户的权限:--------------------|");
int ty = input.nextInt();
User user1 = new User();
user1.setId(id);
user1.setPassword(pa);
user1.setType(ty);
userDao.register(user1.getUsername(),user1.getPassword(),user1.getType());
System.out.println("|---------------------1.退出 0.返回上一级---------------------|");
int y = input.nextInt();
if (y==1) {
System.exit(0);
}else{
getMenu(user);
}
break;
case 3:
System.out.println("|---------------------请输入要修改用户的id:---------------------|");
int id1=input.nextInt();
System.out.println("|--------------------请输入要修改用户的密码:--------------------|");
String password=input.next();
userDao.modify(id1,password);
System.out.println("|---------------------1.退出 0.返回上一级---------------------|");
int z = input.nextInt();
if (z==1) {
System.exit(0);
}else{
getMenu(user);
}
break;
case 4:
System.out.println("|---------------------请输入要删除用户的id:---------------------|");
int id2 = input.nextInt();
userDao.delete(id2);
System.out.println("|---------------------1.退出 0.返回上一级---------------------|");
int o = input.nextInt();
if (o==1) {
System.exit(0);
}else{
getMenu(user);
}
break;
case 5:
getMenu(user);
break;
}
}
}
public void register() throws SQLException {
UserDao userDao=new UserDao();
Scanner input=new Scanner(System.in);
System.out.println("|---------------------------登录失败----------------------------|");
System.out.println("|---------------------------请先注册----------------------------|");
System.out.println("|-------------------------请输入用户名:-------------------------|");
String username1 = input.next();
System.out.println("|--------------------------请输入密码:--------------------------|");
String password1 = input.next();
System.out.println("|--------------------------请确认密码:--------------------------|");
String password2 = input.next();
System.out.println("|--------------------------请输入角色:--------------------------|");
int play1 = input.nextInt();
if (password1.equals(password2) && (play1==0 || play1==1)) {
userDao.register(username1, password1,play1);
System.out.println("|-----------------------是否登入或退出Y/N-----------------------|");
String i = input.next();
if (i.equals("N")) {
System.exit(0);
} else if (!i.equals("Y")) {
System.out.println("|---------------------------输入错误！--------------------------|");
System.exit(0);
}else{
User user2=new User();
user2.setUsername(password1);
user2.setPassword(password2);
user2.setType(play1);
}
} else {
System.out.println("|---------------------密码有误!请重新注册!----------------------|");
}
}
}
②用递归实现n!
package Finance.ruanjian.service;
import java.util.Scanner;
public class test {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("请输入n:");
long n = Long.parseLong(sc.nextLine());
System.out.println(n+"!="+getFac(n));
}
public static long getFac(long n){
if(n == 1){
return 1;
}
return getFac(n-1) * n;
}
}
③编写个人项目
标签：2019.08,19,System,nextInt,int,println,input,out 来源： https://blog.csdn.net/weixin_44809978/article/details/99825103