注册功能-Servlet代码实现、Dao代码实现

Servlet代码实现

RegistUserServlet：

@WebServlet("/registUserServlet")
public class RegistUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 1、获取数据
        Map<String, String[]> map = request.getParameterMap();
        // 2、封装对象
        User user = new User();
        try {
            BeanUtils.populate(user,map);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }
        // 3、调用service完成注册
        UserService service = new UserServiceImpl();
        boolean flag = service.regist(user);
        // 4、响应结果
        ResultInfo info = new ResultInfo();
        if (flag){
            // 注册成功
            info.setFlag(true);
        }else {
            // 注册失败
            info.setFlag(false);
            info.setErrorMsg("注册失败");
        }
        // 将info对象序列化为json
        ObjectMapper mapper = new ObjectMapper();
        String string = mapper.writeValueAsString(info);
        // 将json数据写回客户端
        // 设置content-type
        response.setContentType("application/json;charset=utf-8");
        response.getWriter().write(string);

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

Dao代码实现

UserDao接口：

public interface UserDao {

    /**
     * 根据用户名查询用户信息
     * @param username
     * @return
     */
    public User findByUsername(String username);

    /**
     * 用户保存
     * @param user
     */
    public void save(User user);
}

UserDaoImpl实现类：

public class UserDaoImpl implements UserDao {
    private JdbcTemplate template = new JdbcTemplate(JDBCUtils.getDataSource());

    @Override
    public User findByUsername(String username) {
        User user = null;
        try {
            // 定义sql
            String sql = "select * from tab_user where username = ?";
            // 执行sql
            user = template.queryForObject(sql, new BeanPropertyRowMapper<>(User.class), username);
        } catch (Exception e) {
            
        }
        return user;
    }

    @Override
    public void save(User user) {
        // 1、定义sql
        String sql = "insert into tab_user(username,password,name,birthday,sex,telephone,email) values(?,?,?,?,?,?,?)";
        // 2、执行sql
        template.update(sql,user.getUsername(),user.getPassword(),user.getName(),user.getBirthday()
                        ,user.getSex(),user.getTelephone(),user.getEmail());

    }
}