/** 

* 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(jù)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(shù) 現(xiàn)金紅包只能是 1
 private String wishing;// 紅包祝福語
 private String client_ip;// 調(diào)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(nèi)不能重復(fù)的數(shù)字
 //10位一天內(nèi)不能重復(fù)的數(shù)字實現(xiàn)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(shù)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(shù)的隨機數(shù)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(fā)送用戶的openid", "發(fā)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(zhuǎn)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(shù)據(jù)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(shù)據(jù)
   *
   * @param url  API地址
   * @param xmlObj 要提交的XML數(shù)據(jù)對象
   * @return API回包的實際數(shù)據(jù)
   * @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(xiàn)雙下劃線的bug
//    XStream xStreamForRequestPostData = new XStream(new DomDriver("UTF-8", new XmlFriendlyNameCoder("-_", "_")));

    //將要提交給API的數(shù)據(jù)對象轉(zhuǎn)換成XML格式數(shù)據(jù)Post給API
//    String postDataXML = xStreamForRequestPostData.toXML(xmlObj);

    Util.log("API，POST過去的數(shù)據(jù)是：");
    Util.log(postDataXML);

    //得指明使用UTF-8編碼，否則到API服務(wù)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(shè)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>