【微信支付】springboot-java接入微信支付-JSAPI支付/查单/退款/发送红包（二）---查单

上篇文章我们已经结束了微信支付准备工作以及JSAPI调起支付

文章地址：https://blog.csdn.net/ssdadasd15623/article/details/134684556

接下来实现，付款后的查单操作

查询订单分为微信订单号查询以及商户订单号查询，这里使用商户订单号，也就是自己的系统的订单号

查看微信支付文档-商户订单号查询订单

https://pay.weixin.qq.com/docs/merchant/apis/jsapi-payment/query-by-out-trade-no.html

在请求接口时，注意⚠️：请求参数内的Authorization参数需要提前生成
https://pay.weixin.qq.com/docs/merchant/development/interface-rules/signature-generation.html
在这里微信支付给出了明确的文档教我们如何构造请求签名

构造请求签名串

1. 第一步是请求方式，这里查询订单是“GET”
2. 第二步是请求的绝对URL，这里请求地址是“ https://api.mch.weixin.qq.com/v3/pay/transactions/out-trade-no/{out_trade_no}”，微信给出示例代码如何获取绝对URL，例如订单号为202401010001，商户号为12345678

HttpUrl httpurl =HttpUrl.parse("https://api.mch.weixin.qq.com/v3/pay/transactions/out-trade-no/202401010001?mchid=12345678");//使用okhttp3 SDK

1. 第三步是当前时间戳，这里使用currentTimeMillis()方法生成时间戳

long timestamp =System.currentTimeMillis()/1000;//生成时间戳

1. 第四步是请求随机字符串，这里微信支付的工具类给出了生成随机字符串的方法

String nonceStr =WXPayUtil.generateNonceStr();//生成随机字符串

1. 最后是请求报文主体，这里是GET方法，没有请求体，所以就是一个空的字符串
2. 最终组合在一起的字符串为

GET\n  //请求方式/v3/pay/transactions/out-trade-no/202401010001?mchid=12345678\n //请求地址绝对路径1554208460\n //时间戳593BEC0C930BF1AFEB40B4A08C8FB242\n //随机字符串
\n

⚠️每行内容后需添加换行符‘\n‘

完整代码：

Controller.java文件

......@AutowiredprivateWxPayConfig wxPayConfig;//存放微信基本配置数据@GetMapping("/get_order_status")publicMap<String,Object>get_authorization(@RequestParamString order_no)throwsIOException,SignatureException,NoSuchAlgorithmException,InvalidKeyException{Map<String,Object> map =newHashMap<>();String schema ="WECHATPAY2-SHA256-RSA2048 ";//注意这个，有一个空格HttpUrl httpurl =HttpUrl.parse("https://api.mch.weixin.qq.com/v3/pay/transactions/out-trade-no/"+ order_no +"?mchid="+ wxPayConfig.getMchId());//构造参与签名的URLHttpGet httpGet =newHttpGet("https://api.mch.weixin.qq.com/v3/pay/transactions/out-trade-no/"+ order_no +"?mchid="+ wxPayConfig.getMchId());

        httpGet.setHeader("Authorization", schema +getToken("GET", httpurl,""));//微信支付文档说明，GET请求时body为空
        httpGet.setHeader("Accept","application/json;charset=utf-8");CloseableHttpClient httpClient =HttpClientBuilder.create().build();CloseableHttpResponse response = httpClient.execute(httpGet);// 获取响应状态码int statusCode = response.getStatusLine().getStatusCode();// 获取响应内容String responseBody =EntityUtils.toString(response.getEntity());// 关闭响应对象
        response.close();
        map.put("code", statusCode);
        map.put("data", responseBody);return map;}StringgetToken(String method,HttpUrl url,String body)throwsUnsupportedEncodingException,SignatureException,NoSuchAlgorithmException,InvalidKeyException{String nonceStr =WXPayUtil.generateNonceStr();//WXPayUtil是微信支付自带的sdklong timestamp =System.currentTimeMillis()/1000;//生成时间戳String message =buildMessage(method, url, timestamp, nonceStr, body);String signature =sign(message.getBytes("utf-8"));return"mchid=\""+ wxPayConfig.getMchId()+"\","+"nonce_str=\""+ nonceStr +"\","+"timestamp=\""+ timestamp +"\","+"serial_no=\""+ wxPayConfig.getMchSerialNo()+"\","//mchserialNo是微信支付中申请的证书序列号+"signature=\""+ signature +"\"";}Stringsign(byte[] message)throwsInvalidKeyException,SignatureException,NoSuchAlgorithmException{Signature sign =Signature.getInstance("SHA256withRSA");
        sign.initSign(wxPayConfig.getPrivateKey());
        sign.update(message);returnBase64.getEncoder().encodeToString(sign.sign());}StringbuildMessage(String method,HttpUrl url,long timestamp,String nonceStr,String body){String canonicalUrl = url.encodedPath();if(url.encodedQuery()!=null){
            canonicalUrl +="?"+ url.encodedQuery();}return method +"\n"+ canonicalUrl +"\n"+ timestamp +"\n"+ nonceStr +"\n"+ body +"\n";}......

使用apifox测试结果：