public class SendPhoneVerifyCode extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html;charset=utf-8");
        //获取电话号码
        String phone = request.getParameter("phone");

        //给当前号码发送验证码,返回验证码存在session里，就是这里把我限制了，云信都登不上了，不过不影响使用
        String code = new PhoneVerifyCode(phone).sendCode();
        request.getSession().setAttribute("phoneCode",code);//session是存在于服务器上滴，cookie是在客户端滴

        //将json数据返回前端，提示用户
       response.getWriter().write("{\"message\":\"信息已发送\"}");
    }
}

public class PhoneVerifyCode {
    //发送验证码的请求路径URL
    private static final String
            SERVER_URL="https://api.netease.im/sms/sendcode.action";
    //网易云信分配的账号，请替换你在管理后台应用下申请的Appkey
    private static final String
            APP_KEY="d39afb7b5b9ece021935351e74f75d98";
    //网易云信分配的密钥，请替换你在管理后台应用下申请的appSecret
    private static final String APP_SECRET="543d6e574be7";
    //随机数
    private static final String NONCE="123456";
    //短信模板ID
    private static final String TEMPLATEID="4062279";
    //手机号
    private static  String MOBILE="";
    //验证码长度，范围4～10，默认为4
    private static final String CODELEN="6";

    public PhoneVerifyCode(String MOBILE){
        this.MOBILE=MOBILE;
    }


    public String sendCode(){
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(SERVER_URL);
        String curTime = String.valueOf((new Date()).getTime() / 1000L);
        /*
         * 参考计算CheckSum的java代码，在上述文档的参数列表中，有CheckSum的计算文档示例
         */
        String checkSum = CheckSumBuilder.getCheckSum(APP_SECRET, NONCE, curTime);

        // 设置请求的header
        httpPost.addHeader("AppKey", APP_KEY);
        httpPost.addHeader("Nonce", NONCE);
        httpPost.addHeader("CurTime", curTime);
        httpPost.addHeader("CheckSum", checkSum);
        httpPost.addHeader("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");

        // 设置请求的的参数，requestBody参数
        List<NameValuePair> nvps = new ArrayList<NameValuePair>();
        /*
         * 1.如果是模板短信，请注意参数mobile是有s的，详细参数配置请参考“发送模板短信文档”
         * 2.参数格式是jsonArray的格式，例如 "['13888888888','13666666666']"
         * 3.params是根据你模板里面有几个参数，那里面的参数也是jsonArray格式
         */
        nvps.add(new BasicNameValuePair("templateid", TEMPLATEID));
        nvps.add(new BasicNameValuePair("mobile", MOBILE));
        nvps.add(new BasicNameValuePair("codeLen", CODELEN));

        try {
            httpPost.setEntity(new UrlEncodedFormEntity(nvps, "utf-8"));
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        // 执行请求
        HttpResponse response = null;
        try {
            response = httpClient.execute(httpPost);
        } catch (IOException e) {
            e.printStackTrace();
        }
        /*
         * 1.打印执行结果，打印结果一般会200、315、403、404、413、414、500
         * 2.具体的code有问题的可以参考官网的Code状态表
         */
        String respJSON= null;
        try {
            respJSON = EntityUtils.toString(response.getEntity(), "utf-8");
            System.out.println(respJSON);
        } catch (IOException e) {
            e.printStackTrace();
        }
        Gson gson=new Gson();
        CodeEntity entity = gson.fromJson(respJSON, CodeEntity.class);
        String ss=entity.getObj();
        //因为把我限制了，导致给我的验证码格式不对，截取前面的即是验证码，正常用户直接getobj()即是验证码，没办法被限制了...
        System.out.println(ss.substring(0,7));
        return ss.substring(0,7);
    }
}

public class UserRegisterServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String username = request.getParameter("r_username");
        String password = request.getParameter("r_password");
        String telephone = request.getParameter("r_telephone");
        String phoneVerifyCode = request.getParameter("phoneVerifyCode");

        User user=new User(username, MD5Util.md5(password),telephone);

        //开始注册业务
        UserRegister userRegister=new Dao.UserRegister();
        if(userRegister.isRepeatUsername(username)){
            request.getSession().setAttribute("messageShow","用户名重复");
            response.sendRedirect("Register.jsp");
            return;
        }
 
        if(!userRegister.isRightCode(phoneVerifyCode, (String) request.getSession().getAttribute("phoneCode"))){
            request.getSession().setAttribute("messageShow","验证码错误");
            response.sendRedirect("Register.jsp");
            return;
        }

        userRegister.insertUser(user);
        request.getSession().setAttribute("username",username);
        request.getRequestDispatcher("RegisterSuccess.jsp").forward(request,response);
    }
}

public class UserRegister implements Service.UserRegister{
    private DataSource dataSource=new ComboPooledDataSource();
    private QueryRunner qr=new QueryRunner(dataSource);

    @Override
    public boolean isRightCode(String code, String rightCode) {
        return code.equalsIgnoreCase(rightCode);
    }

    @Override
    public boolean isRepeatUsername(String username) {
        User user=null;
        try {
            user = qr.query("select * from user where username=?", new BeanHandler<>(User.class), username);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return user!=null;
    }

    @Override
    public void insertUser(User user) {
        try {
            qr.update("insert into user(username,password,telephone) values (?,?,?)",user.getUsername(),user.getPassword(),user.getTelephone());
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}