微信小程式支付（普通模式，公眾號支付同適用）java後臺案例

微信小程式支付官方介面文件： 點選檢視微信開放平臺api開發文件

涉及的資料庫表結構在最後面貼上

1.1 小程式支付說明

1.2 小程式輕量級支付模板（引用碼雲作者 egan ）引入jar包

<dependency>
<groupId>com.egzosn</groupId>
<artifactId>pay-java-common</artifactId>
<version>2.12.1</version>
</dependency>
<dependency>
<groupId>com.egzosn</groupId>
<artifactId>pay-java-wx</artifactId>
<version>2.12.1</version>
</dependency>

1.3 初始化微信支付配置儲存類

private WxPayService wxUserPayService;

/**
* 微信支付必要資訊初始化
* @param appId
*/

private void wxUserPayServiceInit(String appId) {
if (wxUserPayService == null) {
WxPayConfigStorage wxPayConfigStorage = new WxPayConfigStorage();
wxPayConfigStorage.setMchId(mchId);//支付商戶號
wxPayConfigStorage.setAppid(appId);//小程式appid
// wxPayConfigStorage.setKeyPublic("轉賬公鑰，轉賬時必填");
wxPayConfigStorage.setSecretKey(appKey);// 商戶支付金鑰
wxPayConfigStorage.setNotifyUrl(domain + "/wx/userpaycallback");//支付結果回撥介面地址，必須外網可訪問的完整url地址
wxPayConfigStorage.setSignType("MD5");
wxPayConfigStorage.setInputCharset("utf-8");

// https證書設定，退款必須 方式一
/*HttpConfigStorage httpConfigStorage = new HttpConfigStorage();
httpConfigStorage.setKeystorePath(keystorePath);//apiclient_cert.p12證書存放路徑，填寫絕對路徑
httpConfigStorage.setStorePassword(mchId);
httpConfigStorage.setPath(true);

httpConfigStorage.setMaxTotal(20);
httpConfigStorage.setDefaultMaxPerRoute(10);
wxUserPayService = new WxPayService(wxPayConfigStorage, httpConfigStorage);*/
wxUserPayService = new WxPayService(wxPayConfigStorage);
}
}

1.4 付款前生成微信預支付交易單，返回正確的預支付交易引數資訊，供給微信小程式前端開發者呼叫付款API

　　　　　　　String title ="開通會員";//支付下單標題
double total_fee = vipConfigInfoService.getInfo().getPrice();//實際支付金額
// 測試預設都是
//if (settingActive.equals("test")) {
//total_fee = 0.01;
//}

// 新增支付記錄資訊，生成商戶訂單號,這裡用支付記錄id
String out_trade_no = payService.representVip(type, appId, openId, userId, total_fee, title);

wxUserPayServiceInit(appId);//初始化微信支付配置儲存類
PayOrder order = new PayOrder(title, type, new BigDecimal(total_fee), out_trade_no);
order.setTransactionType(WxTransactionType.JSAPI);
order.setOpenid(openId);
order.setSpbillCreateIp(spbill_create_ip);//終端ip，呼叫微信支付API的機器IP
order.setAddition(type);
JSONObject result = wxUserPayService.unifiedOrder(order);//微信統一下單介面，此方法在引入的jar中，直接傳入必填的資訊呼叫即可
System.out.println("請求微信支付統一下單結果：" + result.toString());
String timeStamp = System.currentTimeMillis() / 1000 + "";
JSONObject json = new JSONObject();
json.put("nonceStr", result.getString("nonce_str"));
json.put("package", "prepay_id=" + result.getString("prepay_id"));
json.put("timeStamp", timeStamp);
String stringSignTemp = "appId=" + appId + "&nonceStr=" + result.getString("nonce_str")
+ "&package=prepay_id=" + result.getString("prepay_id") + "&signType=MD5&timeStamp="
+ timeStamp;
json.put("paySign", wxUserPayService.createSign(stringSignTemp, "utf-8"));

return json;//介面方法返回預支付交易資訊，小程式前端獲取返回引數，呼叫對應的付款介面

1.5 支付回撥（付款後微信伺服器後臺回撥支付結果資訊）

/**
* 
* 支付回撥介面
*/
@RequestMapping("/userpaycallback")
public String wxUserPaycallback(HttpServletRequest request) {
try {

Map<String, Object> params = wxUserPayService.getParameter2Map(request.getParameterMap(),
request.getInputStream());
if (null == params) {
throw new Exception("回撥引數為空");
}
// 校驗
if (!wxUserPayService.verify(params)) {
throw new Exception("校驗失敗");
}
payDone(params);//支付處理
return wxUserPayService.getPayOutMessage("SUCCESS", "成功").toMessage();

} catch (Exception e) {
e.printStackTrace();
return wxUserPayService.getPayOutMessage("FALL", "失敗").toMessage();
}
}


/**
* 支付結果處理
*/
private void payDone(Map<String, Object> dataMap) throws Exception {
System.out.println("支付回撥：" + JSON.toJSONString(dataMap));
// {"transaction_id":"4200000109201805293331420304","nonce_str":"402880e963a9764b0163a979a16e0002","bank_type":"CFT","openid":"oXI6G5Jc4D44y2wixgxE3OPwpDVg","sign":"262978D36A3093ACBE4B55707D6EA7B2","fee_type":"CNY","mch_id":"1491307962","cash_fee":"10","out_trade_no":"14913079622018052909183048768217","appid":"wxa177427bc0e60aab","total_fee":"10","trade_type":"JSAPI","result_code":"SUCCESS","time_end":"20180529091834","is_subscribe":"N","return_code":"SUCCESS"}
String result_code = dataMap.get("result_code").toString();//支付結果code
String out_trade_no = dataMap.get("out_trade_no").toString();//商戶交易訂單id，此為支付記錄id

if (!result_code.equals("SUCCESS")) {
throw new Exception("支付回撥失敗：" + JSON.toJSONString(dataMap));
}
Pay pay = payService.getById(out_trade_no);//獲取支付記錄
if (pay == null || pay.getStatus() != 10) {//10=可用/待支付 20=支付成功 30=支付失敗
throw new Exception("支付記錄已經處理");
}
payService.pay(out_trade_no, result_code.equals("SUCCESS") ? 20 : 30);//根據回撥結果更改支付結果狀態
// 升級成會員的資料處理
if(result_code.equals("SUCCESS")) {//支付結果SUCCESS，支付成功開通會員，進行下一步操作
Document doc=new Document();
doc.put("vipStatus", 20);//狀態20開通會員
doc.put("vipCreateTime", new Date());
doc.put("expireTime", StringUtil.getMonthNextOrBeforeDate(3));//設定過期時間為3個月後
userService.updateUserVip(pay.getUserId(),doc);
}

}

2.1資料庫表

支付記錄表Pay

3.1需要引用的類class

import com.egzosn.pay.common.bean.PayOrder;
import com.egzosn.pay.common.util.XML;
import com.egzosn.pay.wx.api.WxPayConfigStorage;
import com.egzosn.pay.wx.api.WxPayService;
import com.egzosn.pay.wx.bean.WxTransactionType;