楼主解决了吗？什么原因

SortedMap<String, Object> sortedMap = new TreeMap<String, Object>();
sortedMap.put("appid", wxPayConfigEntity.getApppid()); //应用ID
sortedMap.put("mchid", wxPayConfigEntity.getMch_id()); //商户号

sortedMap.put("description", "珠宝纯定制-" + weiXinPayPo.getBody()); //商品描述
sortedMap.put("out_trade_no", out_trade_no); //商户订单号
sortedMap.put("notify_url", wxPayConfigEntity.getNotify_url()); //通知回调地址
//总金额
int totalFee = weiXinPayPo.getTotal_fee().multiply(new BigDecimal(100)).intValue();//总金额  需要乘以100 ,微信支付默认单位分
Map<String, Object> map1 = new HashMap<>();
map1.put("total",totalFee);
map1.put("currency","CNY");
sortedMap.put("amount",map1);
JSONObject json = new JSONObject(sortedMap);
String reqdata = json.toJSONString();
//校验支付路径
HttpUrl httpurl = HttpUrl.parse(wxPayConfigEntity.getPayurl());
// 请求body参数
log.info(reqdata);

String Sign = null;
PrivateKey privateKey = null;//商户私钥
AutoUpdateCertificatesVerifier verifier = null;
try {
    Sign = wxPayUtil.getToken(nonceStr,timestamp,POST,httpurl,reqdata);
    //======设置请求头========
    privateKey = wxPayUtil.getPrivateKey(wxPayConfigEntity.getKeyPath());
    //不需要传入微信支付证书，将会自动更新
    verifier = new AutoUpdateCertificatesVerifier(
            new WechatPay2Credentials(wxPayConfigEntity.getMch_id(), new PrivateKeySigner(wxPayConfigEntity.getSerialNo(), privateKey)),
            wxPayConfigEntity.getApiV3Key().getBytes("utf-8"));
} catch (IOException e) {
    e.printStackTrace();
} catch (SignatureException e) {
    e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
    e.printStackTrace();
} catch (InvalidKeyException e) {
    e.printStackTrace();
}
//通过WechatPayHttpClientBuilder构造的HttpClient，会自动的处理签名和验签
CloseableHttpClient httpClient = WechatPayHttpClientBuilder.create()
        .withMerchant(wxPayConfigEntity.getMch_id(), wxPayConfigEntity.getSerialNo(), privateKey)
        .withValidator(new WechatPay2Validator(verifier)).build();
HttpPost httpPost = new HttpPost(wxPayConfigEntity.getPayurl());
RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(30000).setConnectTimeout(30000).build();
httpPost.setConfig(requestConfig);
httpPost.addHeader("Content-Type", "application/json");
httpPost.addHeader("Accept","application/json");
httpPost.addHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36");
String authType   ="WECHATPAY2-SHA256-RSA2048";
String authorization = wxPayUtil.getAuthorization(Sign, authType);
httpPost.addHeader("Authorization",authorization);
StringEntity entity = new StringEntity(reqdata,"UTF-8");
httpPost.setEntity(entity);
//======发起请求========
CloseableHttpResponse response = null;
String result = null;
try {
     response = httpClient.execute(httpPost);
     result = EntityUtils.toString(response.getEntity());
} catch (IOException e) {
    e.printStackTrace();
}
int statusCode = response.getStatusLine().getStatusCode();

参数列表里面六个必填的参数都传了,打印处理的json也没问题,请求报400