CoreJava/exp11/AccountManager.java

package exp11;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;

public class AccountManager {
    private String userinfoPath = "userinfo.txt";
    
    private ArrayList<Account> getAccounts() {
        File userinfo = new File(userinfoPath);
        ArrayList<Account> accounts = new ArrayList<>();
        try{
            BufferedReader reader = new BufferedReader(new FileReader(userinfo));
            String line;
            while ((line=reader.readLine()) != null) {
                String[] strs = line.split(",");
                Account account = new Account(strs[0], strs[1]);
                accounts.add(account);
            }
            reader.close();
        }catch(IOException e) {
            e.printStackTrace();
        }

        return accounts;
    }

    Account getAccount(String username) {
        Account account = null;
        ArrayList<Account> accounts = getAccounts();
        for (Account a : accounts) {
            if(a.getUserName() == username) {
                account = a;
            }
        }

        return account;
    }

    public boolean userIsExist(String username) {
        ArrayList<Account> accounts = getAccounts();
        for (Account account : accounts) {
            if (username == account.getUserName()){
                return true;
            }
        }

        return false;
    }

    public void addUser(Account account) {
        if (userIsExist(account.getUserName())) {
            System.out.println("用户已存在!");
        }else {
            File userinfo = new File(userinfoPath);
            try{
                FileWriter writer = new FileWriter(userinfo, true);
                writer.write(account.toString());
                writer.close();
            }catch(IOException e) {
                e.printStackTrace();
            }
        }
        
    }

    boolean usernameVerify(String username) {
        if(username.matches("a-zA-Z")){
            return true;
        }else {
            System.out.println("用户名不合法");
            return false;
        }
    }

    boolean accountVerify(String username, String password) {
        Account account = getAccount(username);
        if ((account.getUserName()==username) && (account.getPassword()==password)){
            return true;
        }

        return false;
    }


}