【service】UserService

package org.app
package service

import dao.UserDAO

import org.app.models.UserModel

class UserService {
  private val userDAO= new UserDAO()
  // 身份校验
  def authenticateUser(username: String, password: String): Option[UserModel] = {
    // 去根据用户名和密码查询，是否有符合要求的用户
    val users = userDAO.loadUsers()
    users.find(user => user.username == username && user.password == password)
  }

  //添加用户
  def addUser(username: String): Boolean = {
    //1.检查用户名是否已存在
    val users = userDAO.loadUsers()
    val user = users.find(_.username == username)
    if (user.isEmpty){
      //可以继续添加
      //2.添加
      //2.1读出所以的用户
      //2.2添加新的用户.设置用户密码，123，类型：普通用户
      users += UserModel(username,"123","普通用户")
      //2.3保存到文件中
      userDAO.saveUsers(users)
      true
    }else{
      false
    }
  }
}