微信JSAPI支付

https://open.weixin.qq.com/connect/oauth2/authorize?appid=首款微信账户的appid&redirect_uri=域名&response_type=code&scope=snsapi_userinfo&state=1#wechat_redirect

例:

https://open.weixin.qq.com/connect/oauth2/authorize?appid=wxe6dcb0b3g15e89992&redirect_uri=https%3A%2F%2Fpay.baidu.com%2F&response_type=code&scope=snsapi_userinfo&state=1#wechat_redirect

 注意:域名要加密:

    public static String urlEnodeUTF8(String str){
        String result = str;
        try {
            result = URLEncoder.encode(str,"UTF-8");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

    public static void main(String[] args) {
        System.out.println(urlEnodeUTF8("http://pay.baidu.com/"));
    }

public Object getOpenId(@PathVariable("code") String code) {
        log.info("code的值为：----->>>>>>>>" + code);
        Map params = new HashMap<>();
        params.put("appid", appId);
        params.put("secret", secret);
        params.put("grant_type", "authorization_code");
        params.put("code", code);
        String str = HttpUtils.doPost("https://api.weixin.qq.com/sns/oauth2/access_token?", params);
        com.alibaba.fastjson.JSonObject object = com.alibaba.fastjson.JSONObject.parseObject(str);
        log.info("根据code,获取openid数据-------->>>>>>>" + object.toString());
        String access_token = object.getString("access_token");
        String openid = object.getString("openid");
        
        return openid;
       
    }

 public Object wxPay(Order order) {
        log.info("openId--------------->>>>>>>>>" + order.getOpenId());
        Map param = new HashMap<>();
        param.put("appid", appId);               //appid
        param.put("mch_id", mchId);             //商户号
        param.put("nonce_str", SignUtil.generateNonceStr());
        param.put("body", "body");                                   //商品描述
        param.put("out_trade_no", order.getWxNo());           //商户订单号,切记订单号为String类型
        param.put("total_fee", order.getAmount());           //金额
        param.put("spbill_create_ip", "127.0.0.1");
        param.put("notify_url", notifyUrl);       //回调接口地址
        param.put("trade_type", "JSAPI");                         //：交易类型
        param.put("openid", order.getOpenId());       //openId
        String keyValueStr = SignUtil.getKeyValueStr(param) + "&key=" + md5Key;
        String signStr = SignUtil.enCode1(keyValueStr).toUpperCase();
        param.put("sign", signStr);               //签名
        String xmlmap = XmlUtils.parseXML(param);
        String resultStr = HttpUtils.sendPost(pathUrl, xmlmap);
        cn.hutool.json.JSonObject jsonObject = XML.toJSonObject(resultStr);
        com.alibaba.fastjson.JSonObject xml = com.alibaba.fastjson.JSONObject.parseObject(jsonObject.get("xml").toString());
        Map result = new TreeMap<>();
        result.put("appId", xml.getString("appid"));
        result.put("timeStamp", Long.toString(System.currentTimeMillis() / 1000));
        result.put("nonceStr", xml.getString("nonce_str"));
        result.put("package", "prepay_id=" + xml.get("prepay_id"));
        result.put("signType", "MD5");
        String keyValueStr2 = SignUtil.getKeyValueStr(result) + "&key=" + md5Key;
        String signStr2 = SignUtil.enCode1(keyValueStr2).toUpperCase();
        result.put("prepay_id", xml.getString("prepay_id"));
        result.put("paySign", signStr2);
        return result;

    }

	public static String generateNonceStr() {
		char[] nonceChars = new char[32];
		for (int index = 0; index < nonceChars.length; ++index) {
			nonceChars[index] = SYMBOLS.charAt(RANDOM.nextInt(SYMBOLS.length()));
		}
		return new String(nonceChars);
	}

private static final String SIGN_FILTER_KEYS = "|sign|";

public static String getKeyValueStr(Map params) {

		StringBuilder sb = new StringBuilder();
		Set keySets = params.keySet();
		List keys = new ArrayList(keySets);
//		Collections.sort(keys);			//首字母排序
//		全名排序
		Comparator