沙箱环境下调用alipay.trade.page.pay出现验签失败

直接使用的支付宝示例

AlipayClient alipayClient = new DefaultAlipayClient("https://openapi.alipay.com/gateway.do","app_id","your private_key","json","utf-8","alipay_public_key","RSA2");
AlipayTradePagePayRequest request = new AlipayTradePagePayRequest();
request.setNotifyUrl("");
request.setReturnUrl("");
JSONObject bizContent = new JSONObject();
bizContent.put("out_trade_no", "20210817010101004");
bizContent.put("total_amount", 0.01);
bizContent.put("subject", "测试商品");
bizContent.put("product_code", "FAST_INSTANT_TRADE_PAY");
//bizContent.put("time_expire", "2022-08-01 22:00:00");

//// 商品明细信息，按需传入
//JSONArray goodsDetail = new JSONArray();
//JSONObject goods1 = new JSONObject();
//goods1.put("goods_id", "goodsNo1");
//goods1.put("goods_name", "子商品1");
//goods1.put("quantity", 1);
//goods1.put("price", 0.01);
//goodsDetail.add(goods1);
//bizContent.put("goods_detail", goodsDetail);

//// 扩展信息，按需传入
//JSONObject extendParams = new JSONObject();
//extendParams.put("sys_service_provider_id", "2088511833207846");
//bizContent.put("extend_params", extendParams);

request.setBizContent(bizContent.toString());
AlipayTradePagePayResponse response = alipayClient.pageExecute(request);
 System.out.println(response.getBody());
if(response.isSuccess()){
System.out.println("调用成功");
} else {
System.out.println("调用失败");
}

点上边的链接成功进入，点下边的action出现验签失败

检查一下配置文件里的公钥和私钥和沙箱里的配置对应上了吗
如果你没动任何代码，那就只会是配置文件里的问题