基于IO版的用户登录注册实例(Java)

package itcast.cn.day22;
/*
 * 用户基本描述包类
 */

public class User {
 private int userName;
 private int passWord;
 public User(){
  super();
 }
 public User(int userName,int passWord){
  super();
  this.userName=userName;
  this.passWord=passWord;  
 }
 public int getUserName() {
  return userName;
 }
 public void setUserName(int userName) {
  this.userName = userName;
 }
 public int getPassWord() {
  return passWord;
 }
 public void setPassWord(int passWord) {
  this.passWord = passWord;
 }

}

public interface UserDao { 
 2 public abstract boolean islogin( String userName, String passWord);
 3 public abstract void register(User user);
 4 }

public class UserDaoImpl implements UserDao{

@Override
public boolean islogin(String userName, String passWord) {
boolean flag = false;
BufferedReader br = null;
try {
br = new BufferedReader(new FileReader("user,txt"));
String line = null;

while((line=br.readLine())!=null){
String[] datas = line.split("=");
if(datas[0].equals(userName)&&datas[1].equals(passWord)){
flag = true;
break;
}
}
} 
catch (FileNotFoundException e) {
//e.printStackTrace();
System.out.println("用户信息获取失败");
}catch (IOException e) {
//e.printStackTrace();
System.out.println("用户登录失败");
}
if(br!=null){
try {
br.close();
} catch (IOException e) {
//e.printStackTrace();
System.out.println("用户释放资源失败");
}
}
return flag;
}

@Override
public void register(User user) {
BufferedWriter bw = null; 
try {
bw = new BufferedWriter(new FileWriter("user.txt"));
bw.write(user.getUserName()+"="+user.getPassWord());
bw.newLine();
} catch (IOException e) {
//e.printStackTrace();
System.out.println("注册失败");
}finally{
if(bw!=null){
try {
bw.close();
} catch (IOException e) {
//e.printStackTrace();
System.out.println("注册释放资源失败");
}
}
}
57}
}

package itcast.cn.day22;

import java.util.Scanner;

public class UserTest {
public static void main(String[] args) {
//欢迎界面
while(true){
UserDao ud = new UserDaoImpl();
System.out.println("*****欢迎进入*****");
System.out.println("登录请输入1");
System.out.println("注册请输入2");
System.out.println("返回请输入3");

System.out.println("请输入你的选择：");
Scanner sc = new Scanner(System.in);
int choice = sc.nextInt();
switch(choice){
case 1:
System.out.println("*****登录界面*****************");
//Scanner sc1 = new Scanner(System.in);
System.out.println("请输入用户名：");
String userName = sc.nextLine();
System.out.println("请输入密码：");
String passWord = sc.nextLine();

boolean flag = ud.islogin(userName, passWord);
if(flag){
System.out.println("登录成功");
break;
}else{
System.out.println("用户名或密码错误");
}

case 2:
System.out.println("*****注册界面****************");
System.out.println("请输入用户名：");
String userName1 = sc.nextLine();
System.out.println("请输入密码：");
String passWord1 = sc.nextLine();

User user = new User();
user.getUserName();
user.getPassWord();
ud.register(user);
System.out.println("注册成功");
break;
case 3:
default:
System.out.println("谢谢使用，欢迎下次再来");
System.exit(0);
break;
}
}
}
}