今天公司打算做一個活動,就是可以讓用戶領取平臺發送的紅包,根據微信官方文檔實現微信企業付款到零錢(因爲商戶號不滿足一些條件無法使用紅包,紅包跟零錢實現方法基本一樣),然後又加入了一些簡單的紅包算法。微信官方文檔地址:https://pay.weixin.qq.com/wiki/doc/api/tools/mch_pay.php?chapter=14_1
紅包發送的規則:總共有100個紅包,總金額100元,最小紅包0.05,最大紅包3,也就是說100元,發100次基本上能領完。紅包領取的規則:在移動端頁面上展示紅包,用戶領取的時候,調用後臺接口領取紅包(一些領取規則可以自己添加)。
零錢(紅包)發放接口如下
@ResponseBody
@RequestMapping("wxSendWallet")
public void wxSendWallet(String openid) {
//微信金額的單位是分 所以這裏要*100
float money = getRedPack();
BigDecimal df = new BigDecimal(money+"");
df = df.multiply(new BigDecimal("100"));
int fee = df.intValue();
//創建一個唯一訂單號
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
String time = sdf.format(new Date());
String orderId = time + (int)(Math.random()*1000000);
String xml = WeixinCore.wxSendWallet(orderId,openid,String.valueOf(fee));
try {
//指定TLS版本, Allow TLSv1 protocol only
SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(
getSSL(), new String[] { "TLSv1" }, null, SSLConnectionSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
//設置httpclient的SSLSocketFactory
CloseableHttpClient httpclient = HttpClients.custom().setSSLSocketFactory(sslsf).build();
HttpPost httppost = new HttpPost("https://api.mch.weixin.qq.com/mmpaymkttransfers/promotion/transfers");
//這裏要設置編碼,不然xml中有中文的話會提示簽名失敗或者展示亂碼
httppost.addHeader("Content-Type", "text/xml");
StringEntity se = new StringEntity(xml,"UTF-8");
httppost.setEntity(se);
CloseableHttpResponse responseEntry = httpclient.execute(httppost);
try {
HttpEntity entity = responseEntry.getEntity();
if (entity != null) {
System.out.println("響應內容長度 : "+ entity.getContentLength());
SAXReader saxReader = new SAXReader();
Document document = saxReader.read(entity.getContent());
Element rootElt = document.getRootElement();
String resultCode = rootElt.elementText("result_code");
if(resultCode.equals("SUCCESS")){
//保存紅包信息到數據庫
//保存用戶領取記錄
}else{
System.out.println(rootElt.elementText("err_code_des"));
}
}
EntityUtils.consume(entity);
}catch(Exception e){
System.out.println("請求失敗");
}
finally {
responseEntry.close();
}
}catch(Exception e){
System.out.println("請求失敗");
}
}
getRedPack方法如下, 假如第一次領取(後臺獲取表示從後臺查詢所得)
public float getRedPack(){
//紅包數 (後臺獲取)
int number = 100;
//剩餘紅包總額 (後臺獲取)
float total = 100;
float money = 0f;
//最小紅包 (後臺獲取)
double min = 0.05;
//系統最大紅包(後臺獲取)
float systemMax = 3;
//最大紅包
double max;
//剩餘領取次數(後臺獲取)
int surplusNumber = 100;
//本次領取之後,剩餘領取次數減一
surplusNumber--;
DecimalFormat df = new DecimalFormat("###.##");
if (surplusNumber > 0) {
//保證即使一個紅包是最大的了,後面剩下的紅包,每個紅包也不會小於最小值
max = total - min * surplusNumber;
int k = (int)surplusNumber / 2;
//保證最後兩個人拿的紅包不超出剩餘紅包
if (surplusNumber <= 2) {
k = surplusNumber;
}
//最大的紅包限定的平均線上下
max = max / k;
//保證每個紅包大於最小值,又不會大於最大值
money = (int) (min * 100 + Math.random() * (max * 100 - min * 100 + 1));
money = (float)money / 100;
//保留兩位小數
money = Float.parseFloat(df.format(money));
//如果紅包大於默認最大值,將紅包職位默認最大值
if(money > systemMax){
money = systemMax;
}
total=(int)(total*100 - money*100);
total = total/100;
System.out.println("第" + (number - surplusNumber) + "個人拿到" + money + "剩下" + total);
} else if(surplusNumber == 0){//如果是最後一次,不需要計算
//如果最後一次紅包超過系統最大紅包,設置爲系統默認最大紅包
if(total > systemMax){
money = systemMax;
total=(int)(total*100 - money*100);
total = total/100;
System.out.println("最後一個人拿到" + money + "剩下"+total);
}else{
money = total;
System.out.println("最後一個人拿到" + money + "剩下0");
}
}else{
System.out.println("紅包已發放完畢");
}
return money;
}
進行簽名,將參數排序並拼接成xml
public static String wxSendWallet(String partner_trade_no, String openid,String total_amount) {
String data = null;
try {
String nonceStr = genNonceStr();
//SortedMap接口主要提供有序的Map實現,默認的排序是根據key值進行升序排序
SortedMap<String,String> parameters = new TreeMap<String,String>();
parameters.put("mch_appid", "商戶appid");
parameters.put("mchid", "商戶號");
parameters.put("nonce_str", nonceStr);
parameters.put("partner_trade_no", partner_trade_no);
parameters.put("openid", openid);
parameters.put("check_name", "NO_CHECK");
parameters.put("amount", total_amount);
parameters.put("spbill_create_ip", WeChatPayUtil.getLocalIP());
parameters.put("desc", "福利紅包");
//簽名
parameters.put("sign", createSign(parameters, "商戶的key"));
data =SortedMaptoXml(parameters);
} catch (Exception e) {
e.printStackTrace();
}
return data;
}
getLocalIp() 獲取ip地址
public static String getLocalIP() {
InetAddress addr = null;
try {
addr = InetAddress.getLocalHost();
} catch (UnknownHostException e) {
e.printStackTrace();
}
byte[] ipAddr = addr.getAddress();
String ipAddrStr = "";
for (int i = 0; i < ipAddr.length; i++) {
if (i > 0) {
ipAddrStr += ".";
}
ipAddrStr += ipAddr[i] & 0xFF;
}
return ipAddrStr;
}
createSign() 簽名算法
/**
* @Title: createSign
* @Description: 簽名算法,創建md5摘要,規則是:按參數名稱a-z排序,遇到空值的參數不參加簽名。
* 參照:https://pay.weixin.qq.com/wiki/doc/api/tools/mch_pay.php?chapter=4_3
*/
public static String createSign(SortedMap<String, String> packageParams, String AppKey) {
StringBuffer sb = new StringBuffer();
Set es = packageParams.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();
if (null != v && !"".equals(v) && !"sign".equals(k) && !"key".equals(k)) {
sb.append(k + "=" + v + "&");
}
}
sb.append("key=" + AppKey);
String sign = MD5Util.MD5Encode(sb.toString(), "UTF-8").toUpperCase();
return sign;
}
MD5Encode() 常見md5摘要
public static String MD5Encode(String origin, String charsetname) {
String resultString = null;
try {
resultString = new String(origin);
MessageDigest md = MessageDigest.getInstance("MD5");
if (charsetname == null || "".equals(charsetname))
resultString = byteArrayToHexString(md.digest(resultString
.getBytes()));
else
resultString = byteArrayToHexString(md.digest(resultString
.getBytes(charsetname)));
} catch (Exception exception) {
}
return resultString;
}
上面的就是整個的邏輯,需要的方法都在這裏了,配置好了運行肯定是沒問題的,測試的效果如下:
隨筆記錄一下,如果有問題請留言