微信支付JSAPI V3

微信支付JSAPI V3

直接上干货：SDK请从官方下载

官方文档地址：微信支付-开发者文档

入口：

@RequestMapping(value = "/wechat/v3/jsapi/orders")
public Map<String, String> ordersV3() {// 组装字段，可见官方文档JSONObject data = new JSONObject();data.put("appid", AuthUtil.APPID); data.put("mchid", AuthUtil.MCHID);data.put("description", "测试商品");data.put("out_trade_no", UUID.randomUUID().toString().replaceAll("-", ""));data.put("notify_url", "你的回调地址");  // 你的回调地址JSONObject amount = new JSONObject();amount.put("total", 1); // 多少钱？单位分data.put("amount", amount);JSONObject payer = new JSONObject();payer.put("openid", OpenId()); // 支付者的open IDdata.put("payer", payer);//发送post请求"统一下单接口"返回预支付id:prepay_id//下单接口：;String, Object> stringObjectMap = HttpUtils.doPostWexinV3(AuthUtil.UNIFIEDORDERURLWX, JSONString());System.out.println("返回结果为：" + stringObjectMap);//通过prepay_id获取签名信息try {HashMap<String, Object> dataMap = TokenWeixin(AuthUtil.APPID, String.("prepay_id")));return new ResponseEntityUtils(dataMap, HttpStatus.OK);} catch (Exception ex) {return null;}
}

关键点1：下单

public static Map<String,Object> doPostWexinV3(String url, String body) { // 自动更新证书功能AutoUpdateCertificatesVerifier verifier = null;try {//这段是官方SDK，照抄就好// 名词解释：CERTNO：证书序列号；CERTPATH：证书在你服务器的地址(apiclient_key.pem)verifier = new AutoUpdateCertificatesVerifier(new WechatPay2Credentials(AuthUtil.MCHID, new PrivateKeySigner(AuthUtil.CERTNO,PemUtil.loadPrivateKey(new FileInputStream(AuthUtil.CERTPATH)))),Bytes("utf-8"));} catch (FileNotFoundException e) {println("证书未找到！=====================");e.printStackTrace();} catch (UnsupportedEncodingException e) {println("文件流错误！=====================");e.printStackTrace();}WechatPayHttpClientBuilder builder = null;try {//这段是官方SDK，照抄就好builder = ate().withMerchant(AuthUtil.MCHID,AuthUtil.CERTNO, PemUtil.loadPrivateKey(new FileInputStream(AuthUtil.CERTPATH))).withValidator(new WechatPay2Validator(verifier));} catch (FileNotFoundException e) {println("证书未找到！=====================");e.printStackTrace();}HttpClient httpClient = builder.build();HttpPost httpPost  = new HttpPost(url);httpPost.addHeader("Content-Type","application/json;chartset=utf-8");httpPost.addHeader("Accept", "application/json");try{if(body==null){throw  new IllegalArgumentException("data参数不能为空");}StringEntity stringEntity = new StringEntity(body,"utf-8");httpPost.setEntity(stringEntity); // 直接执行execute方法，官方会自动处理签名和验签，并进行证书自动更新HttpResponse httpResponse = ute(httpPost);HttpEntity httpEntity = Entity();StatusLine().getStatusCode() == 200){String jsonResult = String(httpEntity);adValue(jsonResult, HashMap.class);}println("微信支付错误信息"&#String(httpEntity));}}catch (Exception e){e.printStackTrace();}return null;
}

关键点1：签名

public static HashMap<String,Object> getTokenWeixin (String appId, String prepay_id) throws IOException, SignatureException, NoSuchAlgorithmException, InvalidKeyException {// 获取随机字符串String nonceStr = getNonceStr();// 获取微信小程序支付packageString packagestr = "prepay_id=" + prepay_id;long timestamp = System.currentTimeMillis() / 1000;//签名，使用字段appId、timeStamp、nonceStr、package计算得出的签名值String message = buildMessageTwo(appId,timestamp,nonceStr,packagestr);//获取对应的签名String signature = Bytes("utf-8"));// 组装返回HashMap<String,Object> map = new HashMap<>();map.put("timeStamp", String.valueOf(timestamp));map.put("nonceStr", nonceStr);map.put("package", packagestr);map.put("signType", "RSA");map.put("paySign", signature);map.put("appId", appId);return map;
}

public static String getNonceStr(){return UUID.randomUUID().toString().replaceAll("-", "").substring(0, 32);
}

private static String buildMessageTwo(String appId, long timestamp, String nonceStr, String packag) {return appId + "n"+ timestamp + "n"+ nonceStr + "n"+ packag + "n";
}

private static String sign(byte[] message) throws NoSuchAlgorithmException, SignatureException, IOException, InvalidKeyException {Signature sign = Instance("SHA256withRSA"); //SHA256withRSAsign.initSign(PemUtil.loadPrivateKey(new FileInputStream(AuthUtil.CERTPATH))); // 微信证书私钥sign.update(message);Encoder().encodeToString(sign.sign());
}

返回处理：

@RequestMapping("/wechat/pay/callback/personal")public Map orderPayCallbackPersonal(@RequestBody Map body, HttpServletRequest request) {Map<String, Object> result = new HashMap();//1：获取微信支付回调的获取签名信息String timestamp = Header("Wechatpay-Timestamp");String nonce = Header("Wechatpay-Nonce");ObjectMapper objectMapper = new ObjectMapper();try {// 2: 开始解析报文体String data = objectMapper.writeValueAsString(body);String message = timestamp + "n" + nonce + "n" + data + "n";//3：获取应答签名String sign = Header("Wechatpay-Signature");//4：获取平台对应的证书String serialNo = Header("Wechatpay-Serial");X509Certificate x509Certificate =  freshCertificate().get(serialNo);if (!WechatPayUtils.verify(x509Certificate, Bytes(), sign)) {throw new IllegalArgumentException("微信支付签名验证失败:" + message);}Map<String, String> resource = (Map) ("resource");// 5：回调报文解密AesUtil aesUtil = new AesUtil(Bytes());//解密后json字符串String decryptToString = aesUtil.("associated_data").getBytes(),("nonce").getBytes(),("ciphertext"));//6：获取微信支付返回的信息JSONObject jsonData = JSONObject.parseObject(decryptToString);//7: 支付状态的判断 如果是success就代表支付成功if ("SUCCESS".("trade_state"))) {// 8：获取支付的交易单号，流水号，和附属参数String out_trade_no = ("out_trade_no").toString();String transaction_id = ("transaction_id").toString();JSONObject amount = JSONObject("amount");// 订单金额信息int payMoney = IntValue("payer_total"); //实际支付金额}result.put("code", "SUCCESS");result.put("message", "成功");} catch (Exception e) {result.put("code", "fail");result.put("message", "系统错误");e.printStackTrace();}return result;}