import java.io.BufferedOutputStream;

 import java.io.BufferedReader;

 import java.io.BufferedWriter;

 import java.io.File;

 import java.io.FileInputStream;

 import java.io.FileNotFoundException;

 import java.io.FileOutputStream;

 import java.io.FileReader;

 import java.io.FileWriter;

 import java.io.IOException;

 import java.util.Scanner;

 public class work2 {

     static Scanner next = new Scanner(System.in);

     /**

      * @param args

      * @throws IOException

      */

     public static void main(String[] args) throws IOException {

         // TODO Auto-generated method stub

         while(true){

             System.out.println("请进行以下操作！\n1.注册\t2.登录");

             int s = next.nextInt();

             switch (s) {

             case 1:

                 Login();

                 break;

             case 2:

                 Logon();

                 break;

             default:

                 System.out.println("输入错误返回！！");

                 break;

             }

         }

     }

     public static String SyIn(){

         System.out.println("请输入账号！");

         String str = next.next();

         System.out.println("请输入密码！");

         String str2 = next.next();

         return str+" "+str2;

     }

     public static void Logon() throws IOException{

         //输入的账号和密码

         String accountAndPassWork = SyIn();

         //文档该在的位置

         FileReader fin = new FileReader("C:\\Users\\wang\\Desktop\\Login.txt");

         //字符流输出缓存区

         BufferedReader reader = new BufferedReader(fin);

         //文档中获取的账号和密码

         String gainAccountAndPassWork = null;

         //账号 的状态

         boolean Y = false;

         //让其返回一行一行的字符串

         while((gainAccountAndPassWork = reader.readLine())!=null){

             //判断字符串和密码加起来是否相同

             if(gainAccountAndPassWork.equals(accountAndPassWork)){

                 System.out.println("登陆成功！");

                 Y = true;

                 break;

             }else{

                 Y = false;

             }

         }

         //关闭资源！

         reader.close();

         //如果状态是没有就不存在

         if(Y == false){

             System.out.println("该账号不存在或密码错误！！");

         }

     }

     public static void Login() throws IOException{

         //输入的账号和密码

         String accountAndPassWork = SyIn();

         //文件的地址

         File file = new File("C:\\Users\\wang\\Desktop\\Login.txt");

         //判断文件在不在，不在的话创建

         if(!file.exists()){

             file.createNewFile();

         }

         //读取文件的内容

         FileReader fileReader = new FileReader(file);

         //字符流读取缓冲区

         BufferedReader bufferR = new BufferedReader(fileReader);

         //给字符读取缓冲器返回的字符设为null

         String contrast = null;

         //阿斯克码表的空格是23

         int As = 32;

         //将空格转为字符串

         String kong = ""+(char)As;

         //获取账号密码的截取

         String[] Ac = accountAndPassWork.split(kong);

         //在这里要有遍历所有的账户的举动

         //不断地读取一行一行的字符串

         while((contrast = bufferR.readLine())!=null){

             //从返回的一行一行的字符串中找取空格并截取

             String[] strAll = contrast.split(kong);

             //判断账号是否有其相同，如果有就return

             if(strAll[0].equals(Ac[0])){

                 System.out.println("用户名重复");

                 //关闭资源

                 bufferR.close();

                 return;

             }

         }

         //字符串流

         FileWriter finWriter = new FileWriter("C:\\Users\\wang\\Desktop\\Login.txt",true);

         //写入缓冲流

         BufferedWriter buffer = new BufferedWriter(finWriter);

         //格一行的，换行

         buffer.newLine();

         //写入账号和密码

         buffer.write(accountAndPassWork);

         //关闭资源

         buffer.close();

         System.out.println("注册成功！");

     }

 }