SpringBoot下怎样实现支付宝接口的使用

<!-- 支付宝 -->
    <dependency>
      <groupId>net.guerlab</groupId>
      <artifactId>sdk-alipay-starter</artifactId>
      <version>${alipay.version}</version>
    </dependency>

sdk:
 alipay:
  dev: true //true沙箱 //false正式
  sign-type: RSA2 //验签方式
  app-id: //APPID
  private-key: //私钥
  alipay-public-key: //支付宝公钥

@RequestMapping(value="/alipay/{orderId}/{money}/{subject}",method=RequestMethod.GET)
  public void pay(@PathVariable String orderId,@PathVariable String money,@PathVariable int subject,HttpServletResponse response) throws AlipayApiException, IOException{
    JSONObject data=new JSONObject();
    //订单号,必填
    data.put("out_trade_no", orderId);
    //PC支付 FAST_INSTANT_TRADE_PAY, APP支付 QUICK_MSECURITY_PAY, 移动H5支付 QUICK_WAP_PAY
    data.put("product_code","FAST_INSTANT_TRADE_PAY");
    //付款金额,必填
    data.put("total_amount", money);
    //订单描述,必填
    if(subject==0)
      data.put("subject","充值业务");    
    //该笔订单允许的最晚付款时间，逾期将关闭交易
    //data.put("timeout_express","");
    //公共校验参数
    //data.put("passback_params","");
    //PC支付
    AlipayTradePagePayRequest request = new AlipayTradePagePayRequest();
    //APP支付
    //AlipayTradeAppPayRequest request = new AlipayTradeAppPayRequest();
    //移动H5支付
    //AlipayTradeWapPayRequest request = new AlipayTradeWapPayRequest();
    //异步通知地址
    request.setNotifyUrl("http://localhost:8765/pay/alipay/notify");
    //同步通知地址
    request.setReturnUrl("http://localhost:8765/pay/alipay/returnHandler");
    //业务参数
    request.setBizContent(data.toJSONString());
    AlipayTradePagePayResponse alipayResponse=client.pageExecute(request);
    response.setContentType("text/html;charset=UTF-8");
    response.getWriter().write(alipayResponse.getBody());
  }

@ResponseBody
  public JSONObject notify(HttpServletRequest request) throws AlipayApiException, UnsupportedEncodingException {
    //获取支付宝POST过来反馈信息 
    Map<String, String> maps = new HashMap<String, String>();
    Map<String, String[]> requestParams = request.getParameterMap();
    for (Iterator<String> iter = requestParams.keySet().iterator(); iter.hasNext();) {
      String name = (String) iter.next();
      String[] values = (String[]) requestParams.get(name);
      String valueStr = "";
      for (int i = 0; i < values.length; i++) {
        valueStr = (i == values.length - 1) ? valueStr + values[i] : valueStr + values[i] + ",";
      }
      // 乱码解决，这段代码在出现乱码时使用。
      //valueStr = new String(valueStr.getBytes("ISO-8859-1"),"utf-8");
      maps.put(name, valueStr);
    }
    //调用SDK验证签名
    boolean signVerified = AlipaySignature.rsaCheckV1(maps, "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAr4eu1yGt0mASOzTjIPCaRRkh+3LSr6hJGHN4ZSg00i96DD0zuo8FzL1md7ZET5dKTHgfcAg+ojNYWB30uU1fnDy9Xj1CW9GC/Ym0vbC1IfsWHN4WqobcyOdLtqU3c+SzCkLHkwV+5RP7mYnyiCpM00cZUv8NFRv/+L3epXnBRTvJhDYYtdaQf4hlQEGkbUKlXnfZxasRswuheNKjEkVziD4Bsk510qG1gefGosYspxDbSSHB8D/8Kdv/fi+0QoG3+uqqoIH8DosdoRjUrWwafd+0m8p+PMwQR4c1CHvvrEsmBADQAedb1W1peoZMk0hfTd4MoKRYsscSd7xkye57RwIDAQAB", "UTF-8", "RSA2");
    if (signVerified) { 
      // TODO 验签成功后 
      //处理结束之后，返回success,支付宝系统将不再发送异步回调请求
      return ActionHelper.responseOk();
    }
    return ActionHelper.responseFailed("支付验签失败");
  }
  
  @RequestMapping(value="alipay/returnHandler",method=RequestMethod.GET)
  @ResponseBody
  public JSONObject returnHandler(HttpServletRequest request) {
    System.out.println("接收到支付宝的同步通知请求");
    Map<String, String[]> maps = request.getParameterMap();
//    for (Entry<String, String[]> map : maps.entrySet()) {
//      System.out.println(map.getKey()+"下的值------------");
//      String[] value = map.getValue();
//      for (String string : value) {
//        System.out.println(string);
//      }
//    }
    String orderId = maps.get("out_trade_no")[0];//获取订单号
    //进行相应的业务处理return ActionHelper.responseOk();
  }