/** * 紅包對象 * @author 小帥帥丶 * @date 2016-8-17上午11:12:19 * @開源中國 http://my.oschina.net/xshuai */public class RedPack implements Serializable{ private String sign; //根據屬性生成的驗證 private String mch_billno; //訂單號 private String mch_id; //商戶號 private String wxappid; // 微信appid private String send_name;// 商戶名稱 private String re_openid;// 用戶openid private String total_amount;// 付款金額 private String total_num;//紅包接收人數 現金紅包只能是 1 private String wishing;// 紅包祝福語 private String client_ip;// 調用接口機器的IP private String act_name;// 活動名稱 private String remark;// 備注 private String nonce_str;// 隨機字符串    //set get省略}

/** * 紅包工具類 * @author 小帥帥丶 * @date 2016-8-17上午11:12:19 * @開源中國 http://my.oschina.net/xshuai */public class RedPackUtil { /** * 生成商戶訂單號 * @param mch_id 商戶號 * @param userId 該用戶的userID * @return */ public static String createBillNo(){ //組成： mch_id+yyyymmdd+10位一天內不能重復的數字 //10位一天內不能重復的數字實現方法如下: //因為每個用戶綁定了userId,他們的userId不同,加上隨機生成的(10-length(userId))可保證這10位數字不一樣 Date dt=new Date(); SimpleDateFormat df = new SimpleDateFormat("yyyymmdd"); String nowTime= df.format(dt); int length = 10 ; return WXConstants.MCH_ID + nowTime + getRandomNum(length); } /** * 生成特定位數的隨機數字 * @param length * @return */ public static String getRandomNum(int length) { String val = ""; Random random = new Random(); for (int i = 0; i < length; i++) {  val += String.valueOf(random.nextInt(10)); } return val; }}

RedPack pack = new RedPack(null//第一次為空, RedPackUtil.createBillNo()//商戶訂單號,  "你自己的商戶號", "公眾號的appid", "名稱",  "要發送用戶的openid", "發送金額 單位是分 例如100 則是1元RMB", "只能是1", "9", "127.0.0.1",  "活動名稱", "備注", "隨機字符串");

String signs = Signature.getSign(pack);//生成的signset到pack對象中pack.setSign(signs);//將對象轉為xml格式 微信要求xml格式String xml = XmlUtil.objToXml(pack,RedPack.class,"xml");

RedPackService service = new RedPacService();    String result = service.redpackOrder(xml);//請求返回的數據是否成功

public class RedPackService{ /** * 紅包接口地址 */ private final static String REDP_ORDER_PATH="https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack"; /** * 紅包 * 需要證書 * @param paramXml * @return */ public static String redpackOrder(String paramXml){ try {    WXBaseService service=new WXBaseService(REDP_ORDER_PATH);   return service.sendPost(paramXml);   } catch (Exception e) {    log.error(e.toString()); }  return null; }} /**   * 通過Https往API post xml數據   *   * @param url  API地址   * @param xmlObj 要提交的XML數據對象   * @return API回包的實際數據   * @throws IOException   * @throws KeyStoreException   * @throws UnrecoverableKeyException   * @throws NoSuchAlgorithmException   * @throws KeyManagementException   */  public String sendPost(String url, String postDataXML) throws IOException, KeyStoreException, UnrecoverableKeyException, NoSuchAlgorithmException, KeyManagementException {    if (!hasInit) {      init();    }    String result = null;    HttpPost httpPost = new HttpPost(url);    //解決XStream對出現雙下劃線的bug//    XStream xStreamForRequestPostData = new XStream(new DomDriver("UTF-8", new XmlFriendlyNameCoder("-_", "_")));    //將要提交給API的數據對象轉換成XML格式數據Post給API//    String postDataXML = xStreamForRequestPostData.toXML(xmlObj);    Util.log("API，POST過去的數據是：");    Util.log(postDataXML);    //得指明使用UTF-8編碼，否則到API服務器XML的中文不能被成功識別    StringEntity postEntity = new StringEntity(postDataXML, "UTF-8");    httpPost.addHeader("Content-Type", "text/xml");    httpPost.setEntity(postEntity);    //設置請求器的配置    httpPost.setConfig(requestConfig);    Util.log("executing request" + httpPost.getRequestLine());    try {      HttpResponse response = httpClient.execute(httpPost);      HttpEntity entity = response.getEntity();      result = EntityUtils.toString(entity, "UTF-8");    } catch (ConnectionPoolTimeoutException e) {      log.e("http get throw ConnectionPoolTimeoutException(wait time out)");    } catch (ConnectTimeoutException e) {      log.e("http get throw ConnectTimeoutException");    } catch (SocketTimeoutException e) {      log.e("http get throw SocketTimeoutException");    } catch (Exception e) {      log.e("http get throw Exception");    } finally {      httpPost.abort();    }    return result;  }

<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[帳號余額不足，請到商戶平臺充值后再重試]]></return_msg><result_code><![CDATA[FAIL]]></result_code><err_code><![CDATA[NOTENOUGH]]></err_code><err_code_des><![CDATA[帳號余額不足，請到商戶平臺充值后再重試]]></err_code_des><mch_billno><![CDATA[1371729102201629220149762756]]></mch_billno><mch_id><![CDATA[這里是商戶號為了保密刪除了]]></mch_id><wxappid><![CDATA[微信公眾號appid]]></wxappid><re_openid><![CDATA[od5qQw8E_LbiAW9sZzuD-2xHtmvx這個是用戶的openid]]></re_openid><total_amount>100</total_amount></xml>