代码如下： [图片] 报错信息如下： 16:11:38.893 DEBUG com.wechat.pay.java.core.auth.WechatPay2Credential - authorization message[POST /v3/pay/transactions/native 1735027898 lWZl2cyaxLtAl8gfwmT2k0KKgoXZ2YwG {"appid":"有值,"mchid":"有值","description":"测试商品标题","out_trade_no":"111111111","notify_url":"***********************","amount":{"total":10}} ] 16:11:38.917 DEBUG com.wechat.pay.java.core.auth.WechatPay2Credential - The generated request signature information is[mchid="有值",nonce_str="有值",timestamp="有值",serial_no="有值",signature="有值"] Exception in thread "main" java.lang.NullPointerException at com.wechat.pay.java.core.util.PemUtil.getSerialNumber(PemUtil.java:231) at com.wechat.pay.java.core.cipher.AbstractVerifier.getSerialNumber(AbstractVerifier.java:138) at com.wechat.pay.java.core.auth.WechatPay2Validator.getSerialNumber(WechatPay2Validator.java:66) at com.wechat.pay.java.core.http.AbstractHttpClient.getWechatPaySerial(AbstractHttpClient.java:137) at com.wechat.pay.java.core.http.AbstractHttpClient.execute(AbstractHttpClient.java:43) at com.wechat.pay.java.service.payments.nativepay.NativePayService.prepay(NativePayService.java:164) at WxPayQuickStart.main(WxPayQuickStart.java:48)

使用沙箱环境开发NATIVE支付接口。 第一步使用正式的密钥key生成正式的sign。 第二步使用sign和mch_id获取sandbox_signkey Map<String, String> params = new HashMap<String, String>();             params.put("mch_id", this.getMchID());             params.put("nonce_str", WXPayUtil.generateNonceStr());             String signSX = WXPayUtil.generateSignature(params, this.getKey());             params.put("sign", signSX);                            String strXML = wxPay.requestWithoutCert("https://api.mch.weixin.qq.com/sandboxnew/pay/getsignkey",                     params, this.getHttpConnectTimeoutMs(), this.getHttpReadTimeoutMs());               Map<String, String> result = WXPayUtil.xmlToMap(strXML);             System.out.println("retrieveSandboxSignKey:" + result);             if ("SUCCESS".equals(result.get("return_code"))) {                                  return result.get("sandbox_signkey");             } 得到sandbox_signkey之后。替换正式的密钥key.然后调用统一下单接口。      data.put("sign",  WXPayUtil.generateSignature(params, iWxPayConfig.getKey()));      System.out.println("发起微信支付下单接口, request={}"+ data.toString());      Map<String, String> response = wxpay.unifiedOrder(data); 返回  response={}{return_msg=沙箱验证签名失败，请确认沙箱签名key是否正确（通过getsignkey调用生成）, return_code=FAIL}