本帖最后由 郑委员 于 2019-3-10 21:55 编辑
Java实现微信支付
一、业务需求
实现app微信支付，后端需要做生成预支付单，响应支付结果。
二、业务流程
查看官方文档
https://pay.weixin.qq.com/wiki/doc/api/app/app.php?chapter=8_3；
三、实现方法
3.1 创建微信工具类 ConstantUtil[Java] 纯文本查看 复制代码 public class ConstantUtil {
/**
* 微信开发平台应用ID
*/
public static final String APP_ID="wx2421b1c4370ec43b";
/**
* 应用对应的凭证
*/
public static final String APP_SECRET="1add1a30ac87aa2db72f57a2375d8fec";
/**
* 应用对应的密钥
*/
public static final String APP_KEY="1add1a30ac87aa2db72f57a2375d8fec";
/**
* 微信支付商户号
*/
public static final String MCH_ID="10000100";
/**
* 商品描述
*/
public static final String BODY="充值";
/**
* 商户号对应的密钥
*/
public static final String PARTNER_key="*******";
/**
* 商户id
*/
public static final String PARTNER_ID="*******";
/**
* 常量固定值
*/
public static final String GRANT_TYPE="client_credential";
/**
* 获取预支付id的接口url
*/
public static String GATEURL = "https://api.mch.weixin.qq.com/pay/unifiedorder";
/**
* 微信服务器回调通知url
*/
public static String NOTIFY_URL="http://url"; //可以访问的url
/**
* 微信服务器查询订单url
*/
public static String ORDER_QUERY="https://api.mch.weixin.qq.com/pay/orderquery";
}
3.2 生成预支付订单
[Java] 纯文本查看 复制代码 Map<String, Object> getOrder(@RequestParam(value = "totalFee") String totalFee, @RequestParam(value = "deviceInfo") String deviceInfo,
@RequestParam(value = "attach") String attach,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
Map<String, Object> map = new HashMap<String, Object>();
// 获取生成预支付订单的请求类
PrepayIdRequestHandler prepayReqHandler = new PrepayIdRequestHandler(request, response);
// String totalFee = request.getParameter("total_fee");
int total_fee = (int) (Float.valueOf(totalFee) * 100);
System.out.println("total:" + total_fee);
System.out.println("total_fee:" + total_fee);
prepayReqHandler.setParameter("appid", ConstantUtil.APP_ID);
prepayReqHandler.setParameter("body", ConstantUtil.BODY);
prepayReqHandler.setParameter("mch_id", ConstantUtil.MCH_ID);
prepayReqHandler.setParameter("device_info", deviceInfo); //卡号
prepayReqHandler.setParameter("attach", attach);//套餐值
String nonce_str = WXUtil.getNonceStr();
prepayReqHandler.setParameter("nonce_str", nonce_str);
prepayReqHandler.setParameter("notify_url", ConstantUtil.NOTIFY_URL);
out_trade_no = String.valueOf(UUID.next());
prepayReqHandler.setParameter("out_trade_no", out_trade_no);
prepayReqHandler.setParameter("spbill_create_ip", request.getRemoteAddr());
String timestamp = WXUtil.getTimeStamp();
prepayReqHandler.setParameter("time_start", timestamp);
System.out.println(String.valueOf(total_fee));
prepayReqHandler.setParameter("total_fee", String.valueOf(total_fee));
prepayReqHandler.setParameter("trade_type", "APP");
/**
* 注意签名（sign）的生成方式，具体见官方文档（传参都要参与生成签名，且参数名按照字典序排序，最后接上APP_KEY,转化成大写）
*/
prepayReqHandler.setParameter("sign", prepayReqHandler.createMD5Sign());
prepayReqHandler.setGateUrl(ConstantUtil.GATEURL);
String prepayid = prepayReqHandler.sendPrepay();
// 若获取prepayid成功，将相关信息返回客户端
if (prepayid != null && !prepayid.equals("")) {
String signs = "appid=" + ConstantUtil.APP_ID + "&noncestr=" + nonce_str + "&package=Sign=WXPay&partnerid="
+ ConstantUtil.PARTNER_ID + "&prepayid=" + prepayid + "×tamp=" + timestamp + "&key="
+ ConstantUtil.APP_KEY;
map.put("code", 0);
map.put("info", "success");
map.put("prepayid", prepayid);
/**
* 签名方式与上面类似
*/
map.put("sign", MD5Util.MD5Encode(signs, "utf8").toUpperCase());
map.put("appid", ConstantUtil.APP_ID);
map.put("device_info", deviceInfo);
map.put("attach", attach);
map.put("timestamp", timestamp); //等于请求prepayId时的time_start
map.put("noncestr", nonce_str); //与请求prepayId时值一致
map.put("package", "Sign=WXPay"); //固定常量
map.put("partnerid", ConstantUtil.PARTNER_ID);
} else {
map.put("code", 1);
map.put("info", "获取prepayid失败");
}
return map;
}
3.3 异步通知客户结果
[Java] 纯文本查看 复制代码 PrintWriter writer = response.getWriter();
InputStream inStream = request.getInputStream();
ByteArrayOutputStream outSteam = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
while ((len = inStream.read(buffer)) != -1) {
outSteam.write(buffer, 0, len);
}
outSteam.close();
inStream.close();
String result = new String(outSteam.toByteArray(), "utf-8");
System.out.println("微信支付通知结果：" + result);
Map<String, String> map = null;
try {
/**
* 解析微信通知返回的信息
*/
map = XMLUtil.doXMLParse(result);
} catch (JDOMException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
官方文档中特别提醒：商户系统对于支付结果通知的内容一定要做签名验证,并校验返回的订单金额是否与商户侧的订单金额一致，防止数据泄漏导致出现“假通知”，造成资金损失。 支付结果通知内容做签名验证。
[Java] 纯文本查看 复制代码 //支付成功后sign校验
String appid=map.get("appid");
String transaction_id=map.get("transaction_id");
String nonce_str =map.get("nonce_str");
String bank_type =map.get("bank_type");
String openid=map.get("openid");
String sign =map.get("sign");
String fee_type =map.get("fee_type");
String mch_id =map.get("mch_id");
String cash_fee =map.get("cash_fee");
String device_info =map.get("device_info");
String out_trade_no =map.get("out_trade_no");
String total_fee =map.get("total_fee");
String trade_type =map.get("trade_type");
String result_code =map.get("result_code");
String attach =map.get("attach");
String time_end =map.get("time_end");
String is_subscribe =map.get("is_subscribe");
String return_code=map.get("return_code");
PrepayIdRequestHandler prepayReqHandler = new PrepayIdRequestHandler(request, response);
prepayReqHandler.setParameter("appid",appid);
prepayReqHandler.setParameter("attach",attach);
prepayReqHandler.setParameter("bank_type",bank_type);
prepayReqHandler.setParameter("cash_fee",cash_fee);
prepayReqHandler.setParameter("device_info",device_info);
prepayReqHandler.setParameter("fee_type",fee_type);
prepayReqHandler.setParameter("is_subscribe",is_subscribe);
prepayReqHandler.setParameter("mch_id",mch_id);
prepayReqHandler.setParameter("nonce_str",nonce_str);
prepayReqHandler.setParameter("openid",openid);
prepayReqHandler.setParameter("out_trade_no",out_trade_no);
prepayReqHandler.setParameter("result_code",result_code);
prepayReqHandler.setParameter("return_code",return_code);
prepayReqHandler.setParameter("time_end",time_end);
prepayReqHandler.setParameter("total_fee",total_fee);
prepayReqHandler.setParameter("trade_type",trade_type);
prepayReqHandler.setParameter("transaction_id",transaction_id);
String endSigns =prepayReqHandler.createMD5Sign(); //支付结果通知的内容 签名校验
商户金额的查询
[Java] 纯文本查看 复制代码 PrepayIdRequestHandler orderQueryHandler = new PrepayIdRequestHandler(request, response);
orderQueryHandler.setParameter("appid",appid);
orderQueryHandler.setParameter("mch_id",mch_id);
orderQueryHandler.setParameter("out_trade_no",out_trade_no);
orderQueryHandler.setParameter("nonce_str",nonce_str);
orderQueryHandler.setParameter("sign",orderQueryHandler.createMD5Sign());
orderQueryHandler.setGateUrl(ConstantUtil.ORDER_QUERY);
String resXml = "";
WeixinOrderBean orderBean =orderQueryHandler.selectOrder();
应答微信
[AppleScript] 纯文本查看 复制代码 if(sign.equals(endSigns) && Integer.parseInt(total_fee)==orderBean.getTotal_fee()){ // 签名通过并且返回的订单的金额与商户金额相同
// 若支付成功，则告知微信服务器收到通知
if (map.get("return_code").equals("SUCCESS")) {
System.out.println("充值成功！");
//PayRecord payRecord=payRecordService.get(Long.valueOf(map.get("out_trade_no")));
System.out.println("订单号：" + Long.valueOf(map.get("out_trade_no")));
String iccids = map.get("device_info");
String monthNum = map.get("attach");
//根据自己的业务处理
int count =trafficCardListService.selectExistTrafficCardByOutTradeNo(map.get("out_trade_no")); //查询商户订单号是否存在
if(count==0){//不存在就插入
List<MsisdnOrderBean> msisdnOrderList = trafficCardListService.selectTrafficCardRechargeResult(iccids, monthNum);
if (msisdnOrderList.size() > 0) {
for (MsisdnOrderBean msisdnOrderBean : msisdnOrderList) {
msisdnOrderBean.setOutTradeNo(map.get("out_trade_no"));
msisdnOrderBean.setDate(map.get("time_end"));
msisdnOrderBean.setIccids(map.get("device_info"));
// msisdnOrderBean.setTotalFee(Integer.parseInt(map.get("total_fee")));
msisdnOrderBean.setTotalFee(BigDecimal.valueOf(Integer.parseInt(map.get("total_fee"))).divide(new BigDecimal(100)).doubleValue());
msisdnOrderBean.setTransactionId(map.get("transaction_id"));
msisdnOrderBean.setTrafficNo(DateUtils.getNowDataTime() + ApiUtils.getFourRandom()); //年月日时分秒+四位随机数
trafficCardListService.insertTrafficCardList(msisdnOrderBean);
}
}
}
resXml = XMLUtil.setXML("SUCCESS", "OK");
} else {
resXml = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>"
+ "<return_msg><![CDATA[通知签名验证失败]]></return_msg>" + "</xml> ";
logger.info("通知签名验证失败");
}
}else{
resXml =XMLUtil.setXML("FAIL", "签名不一致");
}
writer.write(resXml);
writer.flush();
writer.close();
运用到的 PrepayIdRequestHandler 工具类
[Java] 纯文本查看 复制代码 public class PrepayIdRequestHandler extends RequestHandler {
public PrepayIdRequestHandler(HttpServletRequest request,
HttpServletResponse response) {
super(request, response);
}
public String createMD5Sign() {
StringBuffer sb = new StringBuffer();
Set es = super.getAllParameters().entrySet();
Iterator it = es.iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
String k = (String) entry.getKey();
String v = (String) entry.getValue();
sb.append(k + "=" + v + "&");
}
String params=sb.append("key="+ConstantUtil.APP_KEY).substring(0);
String sign = MD5Util.MD5Encode(params, "utf8");
return sign.toUpperCase();
}
// 提交预支付
public String sendPrepay() throws Exception {
String prepayid = "";
Set es=super.getAllParameters().entrySet();
Iterator it=es.iterator();
StringBuffer sb = new StringBuffer("<xml>");
while(it.hasNext()){
Map.Entry entry = (Map.Entry) it.next();
String k = (String) entry.getKey();
String v = (String) entry.getValue();
sb.append("<"+k+">"+v+"</"+k+">");
}
sb.append("</xml>");
String params=sb.substring(0);
System.out.println("请求参数："+params);
String requestUrl = super.getGateUrl();
System.out.println("请求url："+requestUrl);
TenpayHttpClient httpClient = new TenpayHttpClient();
httpClient.setReqContent(requestUrl);
String resContent = "";
if (httpClient.callHttpPost(requestUrl, params)) {
resContent = httpClient.getResContent();
System.out.println("获取prepayid的返回值："+resContent);
Map<String,String> map=XMLUtil.doXMLParse(resContent);
if(map.containsKey("prepay_id"))
prepayid=map.get("prepay_id");
}
return prepayid;
}
// 查询订单
public WeixinOrderBean selectOrder() throws Exception {
Set es=super.getAllParameters().entrySet();
Iterator it=es.iterator();
StringBuffer sb = new StringBuffer("<xml>");
while(it.hasNext()){
Map.Entry entry = (Map.Entry) it.next();
String k = (String) entry.getKey();
String v = (String) entry.getValue();
sb.append("<"+k+">"+v+"</"+k+">");
}
sb.append("</xml>");
String params=sb.substring(0);
System.out.println("请求参数："+params);
String requestUrl = super.getGateUrl();
System.out.println("请求url："+requestUrl);
TenpayHttpClient httpClient = new TenpayHttpClient();
httpClient.setReqContent(requestUrl);
String resContent = "";
WeixinOrderBean orderBean =new WeixinOrderBean();
if (httpClient.callHttpPost(requestUrl, params)) {
resContent = httpClient.getResContent();
Map<String,String> map=XMLUtil.doXMLParse(resContent);
if(map.size()>0){
orderBean.setAppid(map.get("appid"));
orderBean.setAttach(map.get("attach"));
orderBean.setDevice_info(map.get("device_info"));
orderBean.setBank_type(map.get("bank_type"));
orderBean.setMch_id(map.get("mch_id"));
orderBean.setNonce_str(map.get("nonce_str"));
orderBean.setTotal_fee(Integer.parseInt(map.get("total_fee")));
orderBean.setTrade_state(map.get("trade_state"));
}
}
return orderBean;
}
}
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