Java服务端支付功能模块--（二）微信支付

来源：互联网发布：淘宝天猫京东关系编辑：程序博客网时间：2024/06/05 01:58

上一篇写了关于支付宝支付的相关问题，本篇主要介绍微信支付的模块
微信支付可以大体分为5块：1.网页支付、2.App支付、3.H5外部浏览器支付、4.小程序支付、5.H5微信内部浏览器支付。这篇文章主要讲解 2、3、4、5这4种支付。
整体难度来说：H5微信内部浏览器支付>H5外部浏览器支付>小程序支付>App支付>网页支付。
编程语言为JAVA,采用的框架是SpringBoot+Mybatis.

控制层代码：
1.createPayOrder为三端统一调起的接口只用appType和code区分出到底是调用哪个方法
2.因为H5外部浏览器支付需要获取用户的Ip地址所以主动去获取了请求的ip地址
3.isPayEarnest只是区分是否定金

@RestController@RequestMapping("/wechatpay")public class WeChatPayController {    @Autowired    private WeChatPayService weChatPayService;    /**     * 发起统一下单     * @param appType 0为H5端 1为小程序 2为app     * @param billNo Code是微信通过授权后获取的     * @return Result     */    @RequestMapping(value = "/createPayOrder", method = RequestMethod.POST)    public @ResponseBody Result createAppWeChatPayOrder(HttpServletRequest request, int appType, String billNo,            String code, int isPayEarnest) {        if (appType == 0) {             if (code != null) {                 return weChatPayService.h5CreateInnerPayOrder(billNo,code,isPayEarnest);             }            // h5            return weChatPayService.h5CreatePayOrder(billNo, getIpAddr(request), isPayEarnest);        } else if (appType == 1) {            // 小程序            return weChatPayService.wxAppCreatePayOrder(code, billNo, isPayEarnest);        } else {            // app            return weChatPayService.appCreatePayOrder(appType, billNo, isPayEarnest);        }    }    /**     * 获取访问者IP     *      * 在一般情况下使用Request.getRemoteAddr()即可，但是经过nginx等反向代理软件后，这个方法会失效。     *      * 本方法先从Header中获取X-Real-IP，如果不存在再从X-Forwarded-For获得第一个IP(用,分割)，     * 如果还不存在则调用Request .getRemoteAddr()。     *      * @param request     * @return     */    public static String getIpAddr(HttpServletRequest request) {        String ip = request.getHeader("X-Real-IP");        if (!StringUtils.isBlank(ip) && !"unknown".equalsIgnoreCase(ip)) {            return ip;        }        ip = request.getHeader("X-Forwarded-For");        if (!StringUtils.isBlank(ip) && !"unknown".equalsIgnoreCase(ip)) {            // 多次反向代理后会有多个IP值，第一个为真实IP。            int index = ip.indexOf(',');            if (index != -1) {                return ip.substring(0, index);            } else {                return ip;            }        } else {            return request.getRemoteAddr();        }    }    /**     * 查询订单     * @param appType String     * @param wxBillNo String     * @param erpBillNo String     * @return     */    @RequestMapping(value = "/orderquery")    public @ResponseBody Result orderQuery(WeChatPayOrderQueryRequest request) {        return weChatPayService.orderQuery(request);    }}

业务层代码：

```@Servicepublic class WeChatPayServiceImpl implements WeChatPayService {    private static Logger LOG = Logger.getLogger(WeChatPayServiceImpl.class);    //微信支付配置参数    @Autowired    private WeChatPayProperties weChatPayProperties;    private String orderDetail = "XXXX业务:";    //支付业务    @Autowired    private PayService payService;    @Override    public Result wxAppCreatePayOrder(String code, String billNo, int isPayEarnest) {        // 向微信请求获取openId        Map<String, Object> openIdMap = getOpenId(initWxAppOpenIdParmMap(code));        if (openIdMap == null) {            return new Result(Constants.FAILURE_CODE, ErrorMsg.GET_WECHATPAY_OPENID);        }        String openId = (String) openIdMap.get("openid");        if (openId == null) {            return new Result(Constants.FAILURE_CODE, ErrorMsg.GET_WECHATPAY_OPENID);        }        // String session_key = (String) openIdMap.get("session_key");        // 获取订单信息        CarRentOrderPerson dto = payService.findOrder(billNo);        //为了能多次吊起支付,调起支付订单号要加上时间戳        String newbillNo = payService.createNewOrderNo(billNo);        //保存吊起支付请求记录，方便维护（可有可无）        payService.savePayRequest(newbillNo, dto, PayTypeEnums.WXAPP.getIndex(), SourceTypeEnums.WXAPP.getIndex());        // 初始化微信小程序统一下单参数        Map<String, String> params = initWxAppCreatePayBillParams(openId, orderDetail + dto.getModelname(), newbillNo,isPayEarnest == 1 ? dto.getPrepaydeposit().multiply((new BigDecimal(100))): dto.getReceivableamount().multiply((new BigDecimal(100))));        // 向微信平台请求        Result result = sendCreateOrderRequest(params);        if (result.getCode() == Constants.FAILURE_CODE) {            return result;        }        String prePayid = (String) result.getData();        // 封装prePayId到返回参数中，直接返回给前端，前端直接拿着这个就可以调起支付        return new Result(Constants.SUCCESS_CODE, "", initWxAppCreatePayBillReturnParams(prePayid));    }    @Override    public Result appCreatePayOrder(int appType, String billNo, int isPayEarnest) {        // 判断app类型 获取相应appId        String appId = weChatPayProperties.getAppAppid();        if (!(appType == 3 || appType == 2)) {            return new Result(Constants.FAILURE_CODE, ErrorMsg.NO_SUCH_APP_TYPE);        }        // 获取预订单        CarRentOrderPerson dto = payService.findOrder(billNo);        if (dto == null) {            return new Result(Constants.FAILURE_CODE, ErrorMsg.BILLNO_CANOT_BE_NULL);        }        String newbillNo = payService.createNewOrderNo(billNo);        //3为安卓 2为ios 记录请求        if (appType == 3) {            payService.savePayRequest(newbillNo, dto, PayTypeEnums.WXAPP.getIndex(),                    SourceTypeEnums.ANDROID.getIndex());        } else {            payService.savePayRequest(newbillNo, dto, PayTypeEnums.WXAPP.getIndex(), SourceTypeEnums.IOS.getIndex());        }        //创建请求信息        Map<String, String> params = initAppCreateOrderParams(appId, orderDetail + dto.getModelname(), newbillNo,                isPayEarnest == 1 ? dto.getPrepaydeposit().multiply((new BigDecimal(100)))                        : dto.getReceivableamount().multiply(new BigDecimal(100)));        // 向微信请求        Result result = sendCreateOrderRequest(params);        if (result.getCode() == Constants.FAILURE_CODE) {            return result;        }        String prePayid = (String) result.getData();        return new Result(Constants.SUCCESS_CODE, "", initAppCreateOrderRetunParams(appId, prePayid));    }    @Override    //H5外部调起支付    public Result h5CreatePayOrder(String billNo, String ip, int isPayEarnest) {        String sceenInfo = "{\"h5_info\": \"h5_info\" {\"type\": \"api\",  \"wap_url\": \"\",\"wap_name\": \"\"}}";        // 获取预订单        CarRentOrderPerson dto = payService.findOrder(billNo);        if (dto == null) {            return new Result(Constants.FAILURE_CODE, ErrorMsg.BILLNO_CANOT_BE_NULL);        }        String newbillNo = payService.createNewOrderNo(billNo);        // 保存请求参数        payService.savePayRequest(newbillNo, dto, PayTypeEnums.WXAPP.getIndex(), SourceTypeEnums.H5.getIndex());        Map<String, String> params = initH5CreateOrderParams(sceenInfo, orderDetail + dto.getModelname(), newbillNo, ip,                isPayEarnest == 1 ? dto.getPrepaydeposit().multiply((new BigDecimal(100)))                        : dto.getReceivableamount().multiply(new BigDecimal(100)));        Result result = sendRequestToWxApi(params, weChatPayProperties.CREATE_PAY_ORDER_URL);        if (result.getCode() == Constants.FAILURE_CODE) {            return result;        }        @SuppressWarnings("unchecked")        HashMap<String, String> returnHashMap = (HashMap<String, String>) result.getData();        //prePayid为空请求失败        String prePayid = returnHashMap.get("prepay_id");        if (prePayid == null) {            return new Result(Constants.FAILURE_CODE, ErrorMsg.WECHATPAY_WXAPP_CREATE_ORDER_FAIL);        }        String url = returnHashMap.get("mweb_url");        if (url == null) {            return new Result(Constants.FAILURE_CODE, ErrorMsg.WECHATPAY_WXAPP_CREATE_ORDER_FAIL);        }        return new Result(Constants.SUCCESS_CODE, "", initH5CreatePayBillReturnParams(prePayid, url));    }    @Override    //H5微信内部浏览器调起    public Result h5CreateInnerPayOrder(String billNo, String code, int isPayEarnest) {        // 获取openId        Map<String, Object> openIdMap = getH5OpenId(initH5OpenIdParmMap(code));        if (openIdMap == null) {            return new Result(Constants.FAILURE_CODE, ErrorMsg.GET_WECHATPAY_OPENID);        }        String openId = (String) openIdMap.get("openid");        if (openId == null) {            return new Result(Constants.FAILURE_CODE, ErrorMsg.GET_WECHATPAY_OPENID);        }        // 获取预订单        CarRentOrderPerson dto = payService.findOrder(billNo);        String newbillNo = payService.createNewOrderNo(billNo);        payService.savePayRequest(newbillNo, dto, PayTypeEnums.WXAPP.getIndex(), SourceTypeEnums.H5.getIndex());        // 初始化微信统一下单参数        Map<String, String> params = initWxAppCreatePayBillParams(openId, orderDetail + dto.getModelname(), newbillNo,                isPayEarnest == 1 ? dto.getPrepaydeposit().multiply((new BigDecimal(100)))                        : dto.getReceivableamount().multiply((new BigDecimal(100))));        // 向微信平台请求        Result result = sendCreateOrderRequest(params);        if (result.getCode() == Constants.FAILURE_CODE) {            return result;        }        String prePayid = (String) result.getData();        // 封装prePayId到返回参数中        return new Result(Constants.SUCCESS_CODE, "", initH5InnerCreatePayBillReturnParams(prePayid));    }    @Override    public Result orderQuery(WeChatPayOrderQueryRequest request) {        String appid = "";        if (StringUtils.isBlank(request.getErpBillNo()) && StringUtils.isBlank(request.getWxBillNo())) {            return new Result(Constants.FAILURE_CODE, ErrorMsg.BILLNO_CANOT_BE_NULL);        }        if (2 == request.getAppType() || 3 == request.getAppType()) {            appid = weChatPayProperties.getAppAppid();        } else if (0 == request.getAppType()) {            appid = weChatPayProperties.getH5Appid();        } else if (1 == request.getAppType()) {            appid = weChatPayProperties.getWxAppAppid();        } else {            return new Result(Constants.FAILURE_CODE, ErrorMsg.NO_SUCH_APP_TYPE);        }        Map<String, String> params = initOrderQueryParams(appid, request.getWxBillNo(), request.getErpBillNo());        // 向微信请求        Result result = sendRequestToWxApi(params, weChatPayProperties.ORDERQUERY_URL);        if (result.getCode() == Constants.FAILURE_CODE) {            return result;        }        @SuppressWarnings("unchecked")        HashMap<String, String> returnHashMap = (HashMap<String, String>) result.getData();        return new Result(Constants.SUCCESS_CODE, "",                WeChatPayOrderStatus.findNameById(returnHashMap.get("trade_state")));    }    private HashMap<String, String> initH5CreatePayBillReturnParams(String prePayid, String url) {        HashMap<String, String> signMap = new HashMap<String, String>();        signMap.put("appId", weChatPayProperties.getH5Appid());        signMap.put("nonceStr", RandomUtils.generateString(31));        signMap.put("package", "prepay_id=" + prePayid);        signMap.put("signType", "MD5");        signMap.put("timeStamp", new Date().getTime() + "");        signMap.put("mweb_url", url);        signMap.put("paySign", createSign(signMap));        return signMap;    }    private HashMap<String, String> initH5InnerCreatePayBillReturnParams(String prePayid) {        HashMap<String, String> signMap = new HashMap<String, String>();        signMap.put("appId", weChatPayProperties.getH5Appid());        signMap.put("nonceStr", RandomUtils.generateString(31));        signMap.put("package", "prepay_id=" + prePayid);        signMap.put("signType", "MD5");        signMap.put("timeStamp", new Date().getTime() + "");        signMap.put("paySign", createSign(signMap));        return signMap;    }    /**     * 初始化微信小程序统一下单返回参数     * @param prePayid 预订单编号     * @return     */    private HashMap<String, String> initWxAppCreatePayBillReturnParams(String prePayid) {        HashMap<String, String> signMap = new HashMap<String, String>();        signMap.put("appId", weChatPayProperties.getWxAppAppid());        signMap.put("nonceStr", RandomUtils.generateString(31));        signMap.put("package", "prepay_id=" + prePayid);        signMap.put("signType", "MD5");        signMap.put("timeStamp", new Date().getTime() + "");        signMap.put("paySign", createSign(signMap));        return signMap;    }    /**     * 初始化微信小程序统一下单参数     * @param openId 商户openId     * @param body 商品信息     * @param billNo 订单编号     * @param totalFee 总价（单位分）     * @return     */    private Map<String, String> initWxAppCreatePayBillParams(String openId, String body, String billNo,            BigDecimal totalFee) {        // 生成微信下单请求参数        HashMap<String, String> params = new HashMap<String, String>();        Instant now = Instant.now();        Date nowDate = Date.from(now);        // 支付有限时间为10分钟        now = now.plusSeconds(600);        Date endDate = Date.from(now);        params.put("appid", weChatPayProperties.getWxAppAppid());        params.put("mch_id", weChatPayProperties.getWxAppMchId());        params.put("notify_url", weChatPayProperties.getNotifyUrl());        params.put("time_start", DateUtils.dateToString(nowDate, "yyyyMMddHHmmss"));        params.put("time_expire", DateUtils.dateToString(endDate, "yyyyMMddHHmmss"));        params.put("nonce_str", RandomUtils.generateString(31));        params.put("body", body);        /* + DateUtils.dateToString(nowDate, "yyyyMMddHHmm") */        params.put("out_trade_no", billNo);        params.put("total_fee", String.valueOf(totalFee.intValue()));        // params.put("total_fee", String.valueOf(1));        // 测试金额        // params.put("total_fee", String.valueOf(new BigDecimal(100)));        params.put("spbill_create_ip", "0.0.0.1");        params.put("trade_type", "JSAPI");        params.put("openid", openId);        params.put("sign", createSign(params));        return params;    }    /**     * 向微信后台发送统一下单请求     *      * @param 统一下单请求参数 params     * @return     */    private Result sendCreateOrderRequest(Map<String, String> params) {        Result result = sendRequestToWxApi(params, weChatPayProperties.CREATE_PAY_ORDER_URL);        if (result.getCode() == Constants.FAILURE_CODE) {            return result;        }        @SuppressWarnings("unchecked")        HashMap<String, String> returnHashMap = (HashMap<String, String>) result.getData();        String prePayid = returnHashMap.get("prepay_id");        if (prePayid == null) {            return new Result(Constants.FAILURE_CODE, ErrorMsg.WECHATPAY_WXAPP_CREATE_ORDER_FAIL);        }        return new Result(Constants.SUCCESS_CODE, "", prePayid);    }    /**     * 向微信后台发送请求     * @param 参数 params     * @param 地址 url     * @return     */    private Result sendRequestToWxApi(Map<String, String> params, String url) {        String sendMsg = XMLUtils.mapToXml(params);        if (sendMsg == null) {            return new Result(Constants.FAILURE_CODE, ErrorMsg.WECHATPAY_REQUEST);        }        String retString = HttpUtils.postXML(url, sendMsg);        if (retString == null) {            return new Result(Constants.FAILURE_CODE, ErrorMsg.WECHATPAY_REQUEST);        }        Map<String, String> returnHashMap = XMLUtils.parseMap(retString);        if (returnHashMap == null) {            return new Result(Constants.FAILURE_CODE, ErrorMsg.WECHATPAY_REQUEST);        }        if (WeChatPayConstants.RETURN_CODE_FAIL.equals(returnHashMap.get("return_code"))) {            return new Result(Constants.FAILURE_CODE, returnHashMap.get("return_msg"));        }        if (WeChatPayConstants.RETURN_CODE_FAIL.equals(returnHashMap.get("result_code"))) {            return new Result(Constants.FAILURE_CODE, returnHashMap.get("err_code_des"));        }        return new Result(Constants.SUCCESS_CODE, "", returnHashMap);    }    /**     * 初始化App统一下单请求参数     * @return     */    private Map<String, String> initAppCreateOrderParams(String appid, String body, String billNo,            BigDecimal totolFee) {        HashMap<String, String> params = new HashMap<String, String>();        Instant now = Instant.now();        Date nowDate = Date.from(now);        now = now.plusSeconds(600);        Date endDate = Date.from(now);        params.put("appid", appid);        params.put("mch_id", weChatPayProperties.getMchId());        params.put("notify_url", weChatPayProperties.getNotifyUrl());        params.put("time_start", DateUtils.dateToString(nowDate, "yyyyMMddHHmmss"));        params.put("time_expire", DateUtils.dateToString(endDate, "yyyyMMddHHmmss"));        params.put("nonce_str", RandomUtils.generateString(31));        params.put("body", body);        params.put("out_trade_no", billNo);        params.put("total_fee", String.valueOf(totolFee.intValue()));        params.put("spbill_create_ip", "117.28.154.84");        params.put("trade_type", "APP");        params.put("sign", createSign(params));        return params;    }    /**     * 初始化App统一下单请求参数     * @return     */    private Map<String, String> initH5CreateOrderParams(String sceneInfo, String body, String billNo, String ip,            BigDecimal totolFee) {        HashMap<String, String> params = new HashMap<String, String>();        Instant now = Instant.now();        Date nowDate = Date.from(now);        now = now.plusSeconds(600);        Date endDate = Date.from(now);        params.put("appid", weChatPayProperties.getH5Appid());        params.put("mch_id", weChatPayProperties.getMchId());        params.put("notify_url", weChatPayProperties.getNotifyUrl());        params.put("time_start", DateUtils.dateToString(nowDate, "yyyyMMddHHmmss"));        params.put("time_expire", DateUtils.dateToString(endDate, "yyyyMMddHHmmss"));        params.put("nonce_str", RandomUtils.generateString(31));        params.put("body", body);        params.put("out_trade_no", billNo);        params.put("total_fee", String.valueOf(totolFee.intValue()));        params.put("spbill_create_ip", ip);        params.put("trade_type", "MWEB");        params.put("scene_info", sceneInfo);        params.put("sign", createSign(params));        return params;    }    /**     * 初始化App统一下单请求参数     * @return     */    private Map<String, String> initAppCreateOrderRetunParams(String appId, String prepayid) {        HashMap<String, String> signMap = new HashMap<String, String>();        signMap.put("appid", appId);        signMap.put("partnerid", weChatPayProperties.getMchId());        signMap.put("prepayid", prepayid);        signMap.put("package", "Sign=WXPay");        signMap.put("noncestr", RandomUtils.generateString(31));        String timestamp = String.valueOf(new Date().getTime());        signMap.put("timestamp", timestamp.substring(0, timestamp.length() - 3));        signMap.put("sign", createSign(signMap));        return signMap;    }    public Map<String, String> initWxAppOpenIdParmMap(String code) {        HashMap<String, String> params = new HashMap<String, String>();        params.put("appid", weChatPayProperties.getWxAppAppid());        params.put("secret", weChatPayProperties.getWxAppAppsecret());        params.put("js_code", code);        params.put("grant_type", "authorization_code");        return params;    }    public Map<String, String> initH5OpenIdParmMap(String code) {        HashMap<String, String> params = new HashMap<String, String>();        params.put("appid", weChatPayProperties.getH5Appid());        params.put("secret", weChatPayProperties.getH5Appsecret());        params.put("code", code);        params.put("grant_type", "authorization_code");        return params;    }    /**     * 获取openID     * @param params     * @return     */    public Map<String, Object> getOpenId(Map<String, String> params) {        Map<String, Object> map = null;        String retStr = HttpUtils.sendPost(weChatPayProperties.GET_OPEN_ID_URL, params);        if (retStr == null) {            return null;        }        map = stringToHashMap(retStr);        if (map == null || map.get("openid") == null || map.get("session_key") == null) {            return null;        }        return map;    }    /**     * 获取H5openID     * @param params     * @return     */    public Map<String, Object> getH5OpenId(Map<String, String> params) {        Map<String, Object> map = null;        String retStr = HttpUtils.sendPost(weChatPayProperties.GET_H5_OPEN_ID_URL, params);        if (retStr == null) {            return null;        }        map = stringToHashMap(retStr);        if (map == null || map.get("openid") == null) {            return null;        }        return map;    }    private boolean checkSign(Map<String, String> map) {        String signFromAPIResponse = map.get("sign").toString();        if (signFromAPIResponse == "" || signFromAPIResponse == null) {            return false;        }        // 清掉返回数据对象里面的Sign数据（不能把这个数据也加进去进行签名），然后用签名算法进行签名        map.remove("sign");        // 将API返回的数据根据用签名算法进行计算新的签名，用来跟API返回的签名进行比较        String signForAPIResponse = createSign(map);        if (!signForAPIResponse.equals(signFromAPIResponse)) {            return false;        }        return true;    }    @SuppressWarnings("unchecked")    private Map<String, Object> stringToHashMap(String retStr) {        ObjectMapper mapper = new ObjectMapper();        HashMap<String, Object> map = null;        try {            map = mapper.readValue(retStr, HashMap.class);        } catch (JsonParseException e) {            LOG.info(e.toString());            return null;        } catch (JsonMappingException e) {            LOG.info(e.toString());            return null;        } catch (IOException e) {            LOG.info(e.toString());            return null;        }        return map;    }    // 创建签名    private String createSign(Map<String, String> params) {        if (params.isEmpty()) {            return null;        }        StringBuilder sb = new StringBuilder();        params.entrySet().stream().sorted(Comparator.comparing(e -> e.getKey())).forEachOrdered(e -> {            sb.append(e.getKey() + "=" + e.getValue() + "&");        });        String key = weChatPayProperties.getWxAppAppid().equals(params.get("appid"))                || weChatPayProperties.getWxAppAppid().equals(params.get("appId")) ? weChatPayProperties.getWxAppKey()                        : weChatPayProperties.getKey();        sb.append("key=" + key);        String md5 = MD5Helper.getMd5(sb.toString());        return md5.toUpperCase();    }    private Map<String, String> initOrderQueryParams(String appid, String wxBillNo, String erpBillNo) {        Map<String, String> params = new HashMap<String, String>();        params.put("appid", appid);        params.put("mch_id", weChatPayProperties.getWxAppAppid().equals(appid) ? weChatPayProperties.getWxAppMchId()                : weChatPayProperties.getMchId());        params.put("nonce_str", RandomUtils.generateString(31));        if (StringUtils.isNotEmpty(wxBillNo)) {            params.put("transaction_id", wxBillNo);        } else {            // 根据旧单号查询            params.put("out_trade_no", payService.getNewOrderNoByOrderNo(erpBillNo));        }        params.put("sign", createSign(params));        return params;    }    // 获取openID    public Map<String, Object> getOpenId(String code) {        Map<String, Object> map = null;        Map<String, String> params = new HashMap<String, String>();        params.put("appid", weChatPayProperties.getWxAppAppid());        params.put("secret", weChatPayProperties.getWxAppAppsecret());        params.put("js_code", code);        params.put("grant_type", "authorization_code");        String retStr = HttpUtils.sendPost(weChatPayProperties.GET_OPEN_ID_URL, params);        if (retStr == null) {            return null;        }        map = stringToHashMap(retStr);        if (map == null || map.get("openid") == null || map.get("session_key") == null) {            return null;        }        return map;    }

@Configuration@PropertySource("classpath:pay.properties")public class WeChatPayProperties {    @Value("${WeChatPay.wxapp.appid}")    private String wxAppAppid;    @Value("${WeChatPay.wxapp.appsecret}")    private String wxAppAppsecret;    @Value("${WeChatPay.app.appid}")    private String appAppid;    @Value("${WeChatPay.app.appsecret}")    private String appAppsecret;    @Value("${WeChatPay.h5.appid}")    private String h5Appid;    @Value("${WeChatPay.h5.appsecret}")    private String h5Appsecret;    @Value("${WeChatPay.mch_id}")    private String mchId;    @Value("${WeChatPay.key}")    private String key;    @Value("${WeChatPay.notify_url}")    private String notifyUrl;    @Value("${WeChatPay.wxappmch_id}")    private String wxAppMchId;    @Value("${WeChatPay.wxappkey}")    private String wxAppKey;    public final String CREATE_PAY_ORDER_URL = "https://api.mch.weixin.qq.com/pay/unifiedorder";    public final String ORDERQUERY_URL = "https://api.mch.weixin.qq.com/pay/orderquery";    public final String GET_OPEN_ID_URL = "https://api.weixin.qq.com/sns/jscode2session";    public final String GET_H5_OPEN_ID_URL = "https://api.weixin.qq.com/sns/oauth2/access_token";}

总体来说，微信支付其实整体流程基本差不多，除了h5外部浏览器最后是跳转页面，基本都是服务端做好请求参数，客户端返回参数直接就吊起支付。虽然最后代码看起来简单，但这个微信支付捣鼓了我2个多月才断断续续做完，我总结了下主要是以下几个原因：

 1. 微信公众平台，开放平台，商户平台3者的关系特别凌乱。首先像微信小程序的开发是需要在开放平台处理的；接下来H5的微信内部吊起支付是需要通过绑定公众号才能实现，需要通过公众平台来处理；最令人惊讶的是app支付是通过在开放平台开通权限，然后用申请到的商户号进入商户平台处理。跟支付宝只需要在一个开发者中心处理完所有的业务来说，这是腾讯很坑的一点，需要阅读很多文档，因为没有人有精力去研究这三个平台的关联。 2. 腾讯缺少在线客服。支付宝调试遇到问题可以在线向支付宝的技术客服询问，可以很高效地解决问题，相反像腾讯这种虽然文档齐全，但是只能发邮件来问问题我认为效率太低了。因为经常会遇到一些可能客服解决只需要·半分钟的事情，我们却花了3个小时去查看腾讯的文档，这是十分低效的。 3. 微信支付文档齐全但却缺少代码。微信支付几乎没有代码可以使用，都是开发者通过看他的流程图然后自己写代码。我认为微信支付既然都有那么多商户接入，为什么不做一些比较好的代码demo提高接入接口的效率呢？

在这个开发过程中也遇到一些坑：

App支付必须要发布到正式环境才能调起。
H5外部客户端调起支付同样也必须发布到正式环境才能调起。
H5外部客户端支付是在商户平台申请开通的，开通后appid是和App支付的appid一致（我的商户号是通过申请App支付才能生成的），商户号也是和app支付一致
各个客户端调起支付的请求参数是不一样的，需要逐个确认。
app支付的时间戳是10位的，但是其他支付的时间戳长度没有限制。
调起支付的金额一定记得要处理。

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