springboot实现注册页面的Dao和Service代码
时间: 2023-09-08 22:14:11 浏览: 43
由于注册页面的Dao和Service代码与具体的业务逻辑和数据库结构有关,因此无法给出通用的代码。以下是一个简单的示例,仅供参考。
1. UserDao
```
public interface UserDao {
User findByUsername(String username);
void save(User user);
}
```
2. UserService
```
public interface UserService {
User findByUsername(String username);
void register(User user);
}
```
3. UserDaoImpl
```
@Repository
public class UserDaoImpl implements UserDao {
@Autowired
private JdbcTemplate jdbcTemplate;
@Override
public User findByUsername(String username) {
String sql = "SELECT * FROM user WHERE username=?";
return jdbcTemplate.queryForObject(sql, new Object[]{username}, new UserMapper());
}
@Override
public void save(User user) {
String sql = "INSERT INTO user (username, password) VALUES (?, ?)";
jdbcTemplate.update(sql, user.getUsername(), user.getPassword());
}
private static final class UserMapper implements RowMapper<User> {
@Override
public User mapRow(ResultSet rs, int rowNum) throws SQLException {
User user = new User();
user.setId(rs.getLong("id"));
user.setUsername(rs.getString("username"));
user.setPassword(rs.getString("password"));
return user;
}
}
}
```
4. UserServiceImpl
```
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserDao userDao;
@Override
public User findByUsername(String username) {
return userDao.findByUsername(username);
}
@Override
public void register(User user) {
User existingUser = userDao.findByUsername(user.getUsername());
if (existingUser != null) {
throw new IllegalArgumentException("Username already exists: " + user.getUsername());
}
userDao.save(user);
}
}
```
在以上示例中,User为一个简单的实体类,包含id、username和password三个字段。UserDao定义了两个方法,分别用于根据用户名查询用户和保存用户。UserDaoImpl实现了这两个方法,使用JdbcTemplate进行数据库操作。UserService也定义了两个方法,分别用于根据用户名查询用户和注册用户。UserServiceImpl实现了这两个方法,使用UserDao进行数据库操作,并在注册用户时检查用户名是否已存在。