《黑马旅游网》综合案例（三）注册功能后台

Servlet代码实现

UserDao：

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：

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>(User.class), username);
        } catch (DataAccessException e) {

        }
        return user;
    }

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

UserService：

public interface UserService {
    /**
     * 注册用户
     * @param user
     * @return
     */
    boolean regist(User user);
}

UserServiceImpl：

public class UserServiceImpl implements UserService {
    private UserDao userDao = new UserDaoImpl();
    /**
     * 注册用户
     * @param user
     * @return
     */
    @Override
    public boolean regist(User user) {
        //根据用户名查询用户对象
        User u = userDao.findByUsername(user.getUsername());
        //判断是否为null
        if (u!=null){
            //用户名存在，注册失败
            return false;
        }
        //保存用户信息
        userDao.save(user);
        return true;
    }
}

RegistUserServlet：

@WebServlet("/registUserServlet")
public class RegistUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //获取数据
        Map<String, String[]> map = request.getParameterMap();
        //封装对象
        User user = new User();
        try {
            BeanUtils.populate(user,map);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }
        //调用service完成注册
        UserServiceImpl service = new UserServiceImpl();
        boolean flag = service.regist(user);
        ResultInfo info = new ResultInfo();
        //响应结果
        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json并且写回客户端
        ObjectMapper mapper = new ObjectMapper();
        String json = 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(json);
    }

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

访问注册页面添加数据

 

查看数据库添加成功

 

 验证码和前台处理：

在RegistUserServlet中前面加入验证码的校验：

先进行校验在获取其他数据

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //验证码的校验
        String check = request.getParameter("check");
        //从session中获取验证码
        HttpSession session = request.getSession();
        String checkcode_server = (String) session.getAttribute("CHECKCODE_SERVER");
        session.removeAttribute("CHECKCODE_SERVER");//保证验证码只使用一次
        //比较
        if (checkcode_server==null || !checkcode_server.equalsIgnoreCase(check)){
            //验证码错误
            ResultInfo info = new ResultInfo();
            //注册失败
            info.setFlag(false);
            info.setErrorMsg("验证码错误!");
            //将info对象序列化json并且写回客户端
            ObjectMapper mapper = new ObjectMapper();
            String json = 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(json);
            return;
        }
//获取数据
    .....

 

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