微信支付（手机网页支付）

1.后端提供前端调起支付所需要的参数

/** * 微信公众号支付 * *

@param trade_no 订单号 *

@param totalAmount 支付金额 *

@param description 文字内容说明 *

@param attach 自定义参数 length=127 *

@param openId 微信公众号openId *

@param wxnotify 回调地址 * @param request - *

@return - */

public static SortedMap WxPublicPay(String appId, String mchId, String trade_no, BigDecimal totalAmount, String description, String attach, String openId, String wxnotify, HttpServletRequest request) {

Map map = weixinPrePay(appId, mchId, trade_no, totalAmount, description, attach, openId, wxnotify, request);

SortedMap finalpackage = new TreeMap<>();

finalpackage.put("appId", appId);

finalpackage.put("timeStamp", System.currentTimeMillis() / 1000);

finalpackage.put("nonceStr", getRandomString(32));

finalpackage.put("package", "prepay_id=" + map.get("prepay_id"));

finalpackage.put("signType", "MD5");

String sign = createSign(finalpackage); finalpackage.put("paySign", sign);

return finalpackage;

}

/** * 微信下单 * * @param trade_no 订单号 ‘

@param totalAmount 支付金额 *

@param description 文字内容说明 *

@param attach 自定义参数 length=127 *

@param openid 微信公众号openId *

@param wxnotify 回调地址 *

@param request - *

@return - *

@appId appId 支付appid *

@appId mchId 商户号mchId */

private static Map weixinPrePay(String appId, String mchId, String trade_no, BigDecimal totalAmount, String description, String attach, String openid, String wxnotify, HttpServletRequest request) {

SortedMap parameterMap = new TreeMap<>();

parameterMap.put("appid", appId);

parameterMap.put("mch_id", mchId);

parameterMap.put("nonce_str", getRandomString(32));

parameterMap.put("body", description);

// parameterMap.put("attach", attach);

parameterMap.put("out_trade_no", trade_no);

parameterMap.put("fee_type", "CNY");

BigDecimal total = totalAmount.multiply(new BigDecimal(100));

java.text.DecimalFormat df = new java.text.DecimalFormat("0"); System.out.println(df.format(total)); parameterMap.put("total_fee", df.format(total));

parameterMap.put("spbill_create_ip", request.getRemoteAddr());

parameterMap.put("notify_url", wxnotify);

parameterMap.put("sign_type", "MD5");

parameterMap.put("trade_type", "JSAPI");

parameterMap.put("product_id", "qqq12355");

//trade_type为JSAPI是 openid为必填项 parameterMap.put("openid", openid);// parameterMap.put("trade_type", "APP");

String sign = createSign(parameterMap);

System.out.println(sign); parameterMap.put("sign", sign);

// boolean flg = isTenpaySign(parameterMap);

String requestXML = getRequestXml(parameterMap);

String result = httpsRequest("https://api.mch.weixin.qq.com/pay/unifiedorder", "POST", requestXML);

System.out.println(result);

Map map = null;

try {

map = doXMLParse(result);

} catch (Exception e) {

e.printStackTrace();

}

return map;

}

/** * length表示生成字符串的长度 * *

@param length *

@return */

private static String getRandomString(int length) {

//length表示生成字符串的长度 //DATO

String base = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; Random random = new Random();

StringBuilder sb = new StringBuilder();

for (int i = 0; i < length; i++) {

int number = random.nextInt(base.length());

sb.append(base.charAt(number));

}

return sb.toString();

}

//生成签名

private static String createSign(SortedMap parameters) {

StringBuilder sb = new StringBuilder();

Set> es = parameters.entrySet();

for (Map.Entry entry : es) {

String k = (String) entry.getKey();

Object v = entry.getValue();

if (null != v && !"".equals(v) && !"sign".equals(k) && !"key".equals(k)) { sb.append(k).append("=").append(v).append("&"); }

}

System.out.println(CacheUtil.getHospConfig().getWxAppKey()); sb.append("key=").append(CacheUtil.getHospConfig().getWxAppKey()); System.out.println(sb.toString());

return MD5Util.MD5Encode(sb.toString(), "UTF-8").toUpperCase();

}

//请求xml组装

private static String getRequestXml(SortedMap parameters) {

StringBuilder sb = new StringBuilder(); sb.append("");

Set> es = parameters.entrySet();

for (Map.Entry entry : es) {

String key = (String) entry.getKey();

String value = (String) entry.getValue();

if ("attach".equalsIgnoreCase(key) || "body".equalsIgnoreCase(key) || "sign".equalsIgnoreCase(key)) { sb.append("<").append(key).append(">").append("");

} else { sb.append("<").append(key).append(">").append(value).append("");

}

}

sb.append(""); return sb.toString();

}

//请求方法private static String httpsRequest(String requestUrl, String requestMethod, String outputStr) {

try {

URL url = new URL(requestUrl);

HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setDoOutput(true); conn.setDoInput(true);

conn.setUseCaches(false); // 设置请求方式（GET/POST）

conn.setRequestMethod(requestMethod);

conn.setRequestProperty("content-type", "application/x-www-form-urlencoded");

// 当outputStr不为null时输出流写数据

if (null != outputStr) {

OutputStream outputStream = conn.getOutputStream(); // 注意编码格式 outputStream.write(outputStr.getBytes("UTF-8"));

outputStream.close(); } // 从输入流读取返回内容

InputStream inputStream = conn.getInputStream();

InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");

BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

String str = null;

StringBuilder buffer = new StringBuilder();

while ((str = bufferedReader.readLine()) != null) {

buffer.append(str);

}

// 释放资源 bufferedReader.close();

inputStreamReader.close();

inputStream.close();

conn.disconnect();

return buffer.toString();

} catch (ConnectException ce) {

System.out.println("连接超时：{}" + ce);

} catch (Exception e) {

System.out.println("https请求异常：{}" + e); } return null;

}

//xml解析

public static Map doXMLParse(String strxml) throws Exception {

strxml = strxml.replaceFirst("encoding=\".*\"", "encoding=\"UTF-8\"");

if (null == strxml || "".equals(strxml)) {

return null;

}

Map m = new HashMap();

InputStream in = new ByteArrayInputStream(strxml.getBytes("UTF-8"));

SAXBuilder builder = new SAXBuilder();

Document doc = builder.build(in);

Element root = doc.getRootElement();

List list = root.getChildren();

for (Object aList : list) {

Element e = (Element) aList; String k = e.getName();

String v = ""; List children = e.getChildren();

if (children.isEmpty()) {

v = e.getTextNormalize();

} else {

v = getChildrenText(children);

}

m.put(k, v);

}

//关闭流 in.close();

return m;

}

private static String getChildrenText(List children) {

StringBuilder sb = new StringBuilder();

if (!children.isEmpty()) {

for (Element e : children) {

String name = e.getName();

String value = e.getTextNormalize();

List list = e.getChildren();

sb.append("<").append(name).append(">");

if (!list.isEmpty()) {

sb.append(getChildrenText(list));

}

sb.append(value);

sb.append("");

}

}

return sb.toString();}

2.前端调起支付

onBridgeReady: function (obj) {

WeixinJSBridge.invoke( 'getBrandWCPayRequest', {

"appId": obj.appId, //公众号名称，由商户传入 //时间戳，自1970年以来的秒数 "

timeStamp": obj.timeStamp,

"nonceStr": obj.nonceStr, //随机串

"package": obj.package,

"signType": obj.signType, //微信签名方式：

"paySign": obj.paySign //微信签名

}, function (res) {

if (res.err_msg == "get_brand_wcpay_request:ok") {

location.href = `succPay.html?OrderNo=` + obj.orderNo; // 使用以上方式判断前端返回,微信团队郑重提示： // res.err_msg将在用户支付成功后返回ok，但并不保证它绝对可靠。

} else {

// alert(res.err_msg); }

});