微信支付之公众号支付(java实现)

网友投稿 587 2022-12-25


微信支付之公众号支付(java实现)

② mch_id:收款商家商户号;

③ APP_SECRET:第三方唯一凭证密码;

④ key:收款商户后台进行配置,登录微信商户平台–账户设置–安全设置–api安全,设置32位key值。

① 获取用户基本信息(主要是openid)权限配置:微信公众平台–开发–接口权限–网页授权–网页授权域名(不接受IP地址,需通过ICP备案验证,不带http):

② 支付测试目录及测试白名单设置:微信公众平台–微信支付–开发配置,测试授权目录具体到最后一级。

① 微信网页授权获取用户信息文档:https://developers.weixin.qq.com/miniprogram/dev/wxcloud/guide/functions/userinfo.html。根据文档拼装url,引导用户在微信上点击该链接,获取用户openid等基本信息;

https://open.weixin.qq.com/connect/oauth2/authorize?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=SCOPE&state=STATE#wechat_redirect

各个参数需替换,含义如下:

REDIRECT_URI:重定向URL,可为商品列表页面或商品页面,用户授权成功即转到该URL指向页面

scope:snsapi_base和snsapi_userinfo两种,snsapi_base为用户静默授权,snsapi_userinfo需要用户进行授权确认,可以获得更多用户信息。本文选择后者

state:重定向后会带上此参数

③ 用户授权后,重定向的页面获得code参数(若用户禁止授权,则重定向后不会带上code参数,仅会带上state参数redirect_uri?state=STATE ),官方对于code参数的说明如下:

code作为换取access_token的票据,每次用户授权带上的code将不一样,code只能使用一次,5分钟未被使用自动过期。

重定向页面对应controller中通过String code = getPara("code");获取code参数。

④ contoller中同时利用WxPayUtil中方法,调用微信接口,获取当前用户openid,将该openid存入session:

setSessionAttr("openid", (WxPayUtil.getOpenIdByCode(code)).get("openid"));

4、用户选择商品点击付款,在商家提供h5页面确认支付对应controller中,进行统一下单,获得prepay_id(这里需要注意,订单金额转换成以分为单位)。统一下单的官方文档地址为:https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=9_1

//统一下单,返回xml,用return_code判断统一下单结果,获取prepay_id等预支付成功信息

String prePayInfoXml = WxPayUtil.unifiedOrder("WxPay", userOrder.getStr(QfXDtGGqq"orderNo"), (entity.getBigDecimal("orderMoney").multiply(new BigDecimal(100))).intValue(), WxPayUtil.getIpAddr(getRequest()), getSessionAttr("openid").toString());

//生成包含prepay_id的map,map传入前端

map = WxPayUtil.getPayMap(prePayInfoXml);

//将订单号放入map,用以支付后处理

map.put("orderNo",userOrder.getStr("orderNo"));

5、前端获得上一步中的map后,调用微信支付JSAPI,前端js代码如下所示:

6、用户完成支付,后台等待微信支付回调,进行支付成功后操作:

① 用户输入密码完成支付。后台回调地址(统一下单中设定的notify_url)接收微信支付结果,对支付结果进行判断并进行对应操作:

public void notify(){

System.out.print("微信支付回调获取数据开始");

HttpServletRequest request = getRequest();

String resXml = WxPayUtil.getNotifyResult(request);

//向微信输出处理结果,如果成功(SUCCESS),微信就不会继续调用了,否则微信会连续调用8次

renderText(resXml, "text/xml");

}

相关工具及常量类如下:

① WxPayUtil类(支付工具类):

public class WxPayUtil {

private static Logger logger = Logger.getLogger(WxPayUtil.class);

/**

* 根据code获取openid

* @param code

* @return

* @throws IOException

*/

public static Map getOpenIdByCode(String code) throws IOException {

//请求该链接获取access_token

HttpPost httppost = new HttpPost("https://api.weixin.qq.com/sns/oauth2/access_token");

//组装请求参数

String reqEntityStr = "appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code";

reqEntityStr = reqEntityStr.replace("APPID", WxPayConstants.APPID);

reqEntityStr = reqEntityStr.replace("SECRET", WxPayConstants.APP_SECRET);

reqEntityStr = reqEntityStr.replace("CODE", code);

StringEntity reqEntity = new StringEntity(reqEntityStr);

//设置参数

httppost.setEntity(reqEntity);

//设置浏览器

CloseableHttpClient httpclient = HttpClients.createDefault();

//发起请求

CloseableHttpResponse response = httpclient.execute(httppost);

//获得请求内容

String strResult = EntityUtils.toString(response.getEntity(), Charset.forName("utf-8"));

//获取openid

JSONObject jsonObject = new JSONObject(strResult);

Map map = new HashMap();

map.put("openid",jsonObject.get("openid"));

map.put("access_token",jsonObject.get("access_token"));

map.put("refresh_token",jsonObject.get("refresh_token"));

return map;

}

/**

* 统一下单

* @param body

* @param out_trade_no

* @param total_fee

* @param IP

* @param notify_url

* @param openid

* @return

* @throws IOException

*/

public static String unifiedOrder(String body,String out_trade_no,Integer total_fee,String IP,String openid)throws IOException {

//设置访问路径

HttpPost httppost = new HttpPost("https://api.mch.weixin.qq.com/pay/unifiedorder");

String nonce_str = getNonceStr().toUpperCase();//随机

//组装请求参数,按照ASCII排序

String sign = "appid=" + WxPayConstants.APPID +

"&body=" + body +

"&mch_id=" + WxPayConstants.MCH_ID +

"&nonce_str=" + nonce_str +

"&notify_url=" + WxPayConstants.NOTIFY_URL +

"&openid=" + openid +

"&out_trade_no=" + out_trade_no +

"&spbill_create_ip=" + IP +

"&total_fee=" + total_fee.toString() +

"&trade_type=" + WxPayConstants.TRADE_TYPE_JS +

"&key=" + WxPayConstants.KEY;//这个字段是用于之后MD5加密的,字段要按照ascii码顺序排序

sign = ToolMD5.MD5Encode(sign,"").toUpperCase();

//组装包含openid用于请求统一下单返回结果的XML

StringBuilder sb = new StringBuilder("");

sb.append("");

setXmlKV(sb,"appid",WxPayConstants.APPID);

setXmlKV(sb,"body",body);

setXmlKV(sb,"mch_id",WxPayConstants.MCH_ID);

setXmlKV(sb,"nonce_str",nonce_str);

setXmlKV(sb,"notify_url",WxPayConstants.NOTIFY_URL);

setXmlKV(sb,"openid",openid);

setXmlKV(sb,"out_trade_no",out_trade_no);

setXmlKV(sb,"spbill_create_ip",IP);

setXmlKV(sb,"total_fee",total_fee.toString());

setXmlKV(sb,"trade_type",WxPayConstants.TRADE_TYPE_JS);

setXmlKV(sb,"sign",sign);

sb.append("");

System.out.println("统一下单请求:" + sb);

StringEntity reqEntity = new StringEntity(new String (sb.toString().getBytes("UTF-8"),"ISO8859-1"));//这个处理是为了防止传中文的时候出现签名错误

httppost.setEntity(reqEntity);

CloseableHttpClient httpclient = HttpClients.createDefault();

CloseableHttpResponse response = httpclient.execute(httppost);

String strResult = EntityUtils.toString(response.getEntity(), Charset.forName("utf-8"));

System.out.println("统一下单返回xml:" + strResult);

return strResult;

}

/**

* 根据统一下单返回预支付订单的id和其他信息生成签名并拼装为map(调用微信支付)

* @param prePayInfoXml

* @return

*/

public static Map getPayMap(String prePayInfoXml){

Map map = new HashMap();

String prepay_id = getXmlPara(prePayInfoXml,"prepay_id");//统一下单返回xml中prepay_id

String timeStamp = String.valueOf((System.currentTimeMillis()/1000));//1970年到现在的秒数

String nonceStr = getNonceStr().toUpperCase();//随机数据字符串

String packageStr = "prepay_id=" + prepay_id;

String signType = "MD5";

String paySign =

"appId=" + WxPayConstants.APPID +

"&nonceStr=" + nonceStr +

"&package=prepay_id=" + prepay_id +

"&signType=" + signType +

"&timeStamp=" + timeStamp +

"&key="+ WxPayConstants.KEY;//注意这里的参数要根据ASCII码 排序

paySign = ToolMD5.MD5Encode(paySign,"").toUpperCase();//将数据MD5加密

map.put("appId",WxPayConstants.APPID);

map.put("timeStamp",timeStamp);

map.put("nonceStr",nonceStr);

map.put("packageStr",packageStr);

map.put("signType",signType);

map.put("paySign",paySign);

map.put("prepay_id",prepay_id);

return map;

}

/**

* 修改订单状态,获取微信回调结果

* @param request

* @return

*/

public static String getNotifyResult(HttpServletRequest request){

String inputLine;

String notifyXml = "";

String resXml = "";

try {

while ((inputLine = request.getReader().readLine()) != null){

notifyXml += inputLine;

}

request.getReader().close();

} catch (Exception e) {

logger.debug("xml获取失败:" + e);

e.printStackTrace();

}

System.out.println("接收到的xml:" + notifyXml);

logger.debug("收到微信异步回调:");

logger.debug(notifyXml);

if(ToolString.isEmpty(notifyXml)){

logger.debug("xml为空:");

}

String appid = getXmlPara(notifyXml,"appid");;

String bank_type = getXmlPara(notifyXml,"bank_type");

String cash_fee = getXmlPara(notifyXml,"cash_fee");

String fee_type = getXmlPara(notifyXml,"fee_type");

String is_subscribe = getXmlPara(notifyXml,"is_subscribe");

String mch_id = getXmlPara(notifyXml,"mch_id");

String nonce_str = getXmlPara(notifyXml,"nonce_str");

String openid = getXmlPara(notifyXml,"openid");

String out_trade_no = getXmlPara(notifyXml,"out_trade_no");

String result_code = getXmlPara(notifyXml,"result_code");

String return_code = getXmlPara(notifyXml,"return_code");

String sign = getXmlPara(notifyXml,"sign");

String time_end = getXmlPara(notifyXml,"time_end");

String total_fee = getXmlPara(notifyXml,"total_fee");

String trade_type = getXmlPara(notifyXml,"trade_type");

String transaction_id = getXmlPara(notifyXml,"transaction_id");

//根据返回xml计算本地签名

String localSign =

"appid=" + appid +

"&bank_type=" + bank_type +

"&cash_fee=" + cash_fee +

"&fee_type=" + fee_type +

"&is_subscribe=" + is_subscribe +

"&mch_id=" + mch_id +

"&nonce_str=" + nonce_str +

"&openid=" + openid +

"&out_trade_no=" + out_trade_no +

"&result_code=" + result_code +

"&return_code=" + return_code +

"&time_end=" + time_end +

"&totaQfXDtGGqql_fee=" + total_fee +

"&trade_type=" + trade_type +

"&transaction_id=" + transaction_id +

"&key=" + WxPayConstants.KEY;//注意这里的参数要根据ASCII码 排序

localSign = ToolMD5.MD5Encode(localSign,"").toUpperCase();//将数据MD5加密

System.out.println("本地签名是:" + localSign);

logger.debug("本地签名是:" + localSign);

logger.debug("微信支付签名是:" + sign);

//本地计算签名与微信返回签名不同||返回结果为不成功

if(!sign.equals(localSign) || !"SUCCESS".equals(result_code) || !"SUCCESS".equals(return_code)){

System.out.println("验证签名失败或返回错误结果码");

logger.error("验证签名失败或返回错误结果码");

resXml = "" + "<![CDATA[FAIL]]>" + "<![CDATA[FAIL]]>" + " ";

}else{

System.out.println("支付成功");

resXml = "" + "<![CDATA[SUCCESS]]>" + "<![CDATA[OK]]>" + " ";

}

return resXml;

}

/**

* 获取32位随机字符串

* @return

*/

public static String getNonceStr(){

String str = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

StringBuilder sb = new StringBuilder();

Random rd = new Random();

for(int i = 0 ; i < 32 ; i ++ ){

sb.append(str.charAt(rd.nextInt(str.length())));

}

return sb.toString();

}

/**

* 插入XML标签

* @param sb

* @param Key

* @param value

* @return

*/

public static StringBuilder setXmlKV(StringBuilder sb,String Key,String value){

sb.append("<");

sb.append(Key);

sb.append(">");

sb.append(value);

sb.append("");

sb.append(Key);

sb.append(">");

return sb;

}

/**

* 解析XML 获得名称为para的参数值

* @param xml

* @param para

* @return

*/

public static String getXmlPara(String xml,String para){

int start = xml.indexOf("<"+para+">");

int end = xml.indexOf(""+para+">");

if(start < 0 && end < 0){

return null;

}

return xml.substring(start + ("<"+para+">").length(),end).replace("<![CDATA[","").replace("]]>","");

}

/**

* 获取ip地址

* @param request

* @return

*/

public static String getIpAddr(HttpServletRequest request) {

InetAddress addr = null;

try {

addr = InetAddress.getLocalHost();

} catch (UnknownHostException e) {

return request.getRemoteAddr();

}

byte[] ipAddr = addr.getAddress();

String ipAddrStr = "";

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

if (i > 0) {

ipAddrStr += ".";

}

ipAddrStr += ipAddr[i] & 0xFF;

}

return ipAddrStr;

}

}

② 常量类(根据商户信息进行设置):

public class WxPayConstants {

//第三方用户唯一ID

public static String APPID = "";

//第三方用户唯一凭证密码

public static String APP_SECRET = "";

//商户ID

public static String MCH_ID = "";

//微信商户平台-账户设置-安全设置-api安全,配置32位key

public static String KEY = "";

//交易类型

public static String TRADE_TYPE_JS = "JSAPI";

//微信支付回调url

public static String NOTIFY_URL = "";

}


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