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// 拼签名串 StringBuffer sb = new StringBuffer(); sb.append("POST").append("\n"); sb.append("/v3/applyment4sub/applyment/").append("\n"); sb.append(timestamp).append("\n"); sb.append(nonce_str).append("\n"); sb.append(business).append("\n"); System.out.println(sb.toString()); //计算签名值 String sign = new String(Base64.encodeBase64(ApiclientCertUtil.signRSA(sb.toString(), ApiclientCertUtil.getRsaPrivateKey()))); // 拼装http头的Authorization内容 String authorization = "WECHATPAY2-SHA256-RSA2048 mchid=\"" + ApiclientCertUtil.getMchid() + "\",nonce_str=\"" + nonce_str + "\",signature=\"" + sign + "\",timestamp=\"" + timestamp + "\",serial_no=\"" + ApiclientCertUtil.getSerial_no() + "\""; // 设置头部 post.addHeader("Content-Type", "application/json"); post.addHeader("Accept", "application/json"); post.addHeader("Wechatpay-Serial", serial_no); post.addHeader("Authorization", authorization); 返回错误信息： "code":"SIGN_ERROR","detail":{"detail":{"issue":"sign not match"},"field":"signature","location":"authorization" 特约商户入驻全部参数都要提交吗？有部分不是必要提交的我就没添，是不是签名拼接第5行body的请求参数json参数不全的问题吗?