调用接口：https://api.mch.weixin.qq.com/v3/pay/transactions/jsapi 1、部分代码： String token = getToken("POST", httpurl, rootNode.toString()); //请求URL HttpPost httpPost = new HttpPost("https://api.mch.weixin.qq.com/v3/pay/transactions/jsapi"); StringEntity entity = new StringEntity(rootNode.toString(), "utf-8"); entity.setContentType("application/json"); httpPost.setEntity(entity); httpPost.setHeader("Accept", "application/json"); httpPost.setHeader("Authorization", schema + " " + token); CloseableHttpClient httpClient = HttpClientBuilder.create().build(); //完成签名并执行请求 CloseableHttpResponse response = httpClient.execute(httpPost); try { int statusCode = response.getStatusLine().getStatusCode(); if (statusCode == 200) { System.out.println("success,return body = " + EntityUtils.toString(response.getEntity())); } else if (statusCode == 204) { System.out.println("success"); } else { System.out.println("failed,resp code = " + statusCode + ",return body = " + EntityUtils.toString(response.getEntity())); throw new IOException("request failed"); } } finally { response.close(); httpClient.close(); } 2、token的获取方式（官方代码）： String getToken(String method, HttpUrl url, String body) throws IOException, NoSuchAlgorithmException, SignatureException, InvalidKeyException { String nonceStr = UUID.randomUUID().toString().replace("-", ""); long timestamp = System.currentTimeMillis() / 1000; String message = buildMessage(method, url, timestamp, nonceStr, body); String signature = sign(message.getBytes("utf-8")); return "mchid=\"" + mchId + "\"," + "nonce_str=\"" + nonceStr + "\"," + "timestamp=\"" + timestamp + "\"," + "serial_no=\"" + serialNo2 + "\"," + "signature=\"" + signature + "\""; } 3、报如下错误： { "code": "SIGN_ERROR", "detail": { "detail": { "issue": "sign not match" }, "field": "signature", "location": "authorization", "sign_information": { "method": "POST", "sign_message_length": 311, "truncated_sign_message": "POST\n/v3/pay/transactions/jsapi\n1730605701\nc34438f0221f4cd8800e25cb237ba36e\n{\"mchid\"\n }, "url": "/v3/pay/transactions/jsapi" }, "message": "签名错误，请检查后再试" }

[图片]

[图片]