src/service/UserService.java

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package service;

import dao.UserDao;
import model.Page;
import model.User;

import java.sql.SQLException;
import java.util.List;

public class UserService {
    private UserDao uDao = new UserDao();
    public boolean register(User user) {
        try {
            if(uDao.isUsernameExist(user.getUsername())) {
                return false;
            }
            if(uDao.isEmailExist(user.getEmail())) {
                return false;
            }
            uDao.addUser(user);
            return true;
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return false;
    }

    public User login(String ue,String password) {
        User user=null;
        try {
            user = uDao.selectByUsernamePassword(ue, password);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        if(user!=null) {
            return user;
        }
        try {
            user=uDao.selectByEmailPassword(ue, password);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        if(user!=null) {
            return user;
        }
        return null;
    }
    public User selectById(int id) {
        User u=null;
        try {
            u = uDao.selectById(id);
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return u;
    }