javaIO练习之简单用户登录系统

package com.iouser.pojo;

public class User {
	private int id ;
	private String name ;
	private String psw ;
	private String sex ;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPsw() {
		return psw;
	}
	public void setPsw(String psw) {
		this.psw = psw;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	
}

package com.iouser.main;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

import com.iouser.pojo.User;

public class UserDemoMain {
	private static Scanner sc ;
	private static BufferedWriter bw ;
	private static BufferedReader br ;
	
	public static void init(){
		sc = new Scanner(System.in);
		try {
			bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("bw.txt",true),"UTF-8"));
			br = new BufferedReader(new InputStreamReader(new FileInputStream("bw.txt"),"UTF-8"));
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	public static void close(){
		try{
			if(bw!=null){
				bw.close();
			}
			if(br!=null){
				br.close();
			}
		}catch(IOException e){
			e.printStackTrace();
		}
	}
	public static void main(String[] args) {
		init();
		while(true){
			System.out.println("A: 登录");
			System.out.println("B: 注册");
			System.out.println("Q: 退出");
			String in = sc.next();
			if("q".equals(in.toLowerCase())){
				System.out.println("************正在退出系统！************");
				break;
			}else if("a".equals(in.toLowerCase())){
				boolean flag = login();
				if(flag){
					System.out.println("*********进入系统功能页面**********");
				}else{
					System.out.println("*********登录失败，请重新选择*******");
				}
			}else if("b".equals(in.toLowerCase())){
				register();
			}else{
				System.out.println("您输入有误，请重新输入");
			}
		}
		close();
		System.out.println("已退出系统，谢谢使用");
	}

	private static void register() {
		 System.out.println("******请输入你的账号信息进行注册***********");
		 System.out.println("请输入你的账号名称：");
		 //通过获取文件中已存在的账号信息
	/*	 List<User> list = null;
		 try {
			 list = getAllUser();
		} catch (IOException e) {
			e.printStackTrace();
		}*/
		String name = sc.next() ;
		//判断是否存在...省略
		System.out.println("请输入你的密码：");
		String psw = sc.next();
		System.out.println("请输入你的性别：");
		String sex = sc.next();
		System.out.println("**********正在为你注册*********");
		writeUser(name,psw,sex);
	}

	private static boolean writeUser(String name, String psw, String sex) {
		List<User> list = null;
		 try {
			 list = getAllUser();
		} catch (IOException e) {
			e.printStackTrace();
		}
		int size = list.size();
		StringBuilder sbr = new StringBuilder();
		sbr.append(size+1);
		sbr.append(","+name);
		sbr.append(","+psw);
		sbr.append(","+sex);
		System.out.println("sbr="+sbr.toString());
		try {
			bw.write(sbr.toString());
			bw.newLine();
			bw.flush();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return true; 
	}
	private static boolean login() {
		System.out.println("********请输入你的账号和密码进行登录*******");
		System.out.println("请输入你的账号：");
		Scanner sc = new Scanner(System.in);
	    String name = sc.next();
	    System.out.println(name);
		System.out.println("请输入你的密码：");
		String pwd = sc.next();
		System.out.println(pwd);
		List<User> list = null;
		try {
			 list = getAllUser();
		} catch (IOException e) {
			e.printStackTrace();
		} 
		if(list!=null && list.size()!=0){
			for(User u : list){
				if(u.getName().equals(name) && u.getPsw().equals(pwd)){
					System.out.println("**********登录成功***********");
					return true;
				}
			}
		} 
		return false ;
	}
	
	private static List<User> getAllUser() throws IOException {
		close();
		init();
		List<User> list = new ArrayList<User>();
		String line = null ;
	    while((line = br.readLine())!=null){
	    	String[] arrays = line.split(",");
	    	User user = new User();
	    	user.setId(Integer.parseInt(arrays[0]));
	    	user.setName(arrays[1]);
	    	user.setPsw(arrays[2]);
	    	user.setSex(arrays[3]);
	    	list.add(user);
	    }
		return list;
	}
}