接口发放微信企业号红包

微信接口红包这块就一个坑，我们在实际的开发中找了很多种办法 也看了N次 文档，最后我们通过以下步骤成功发送红包

1.保存用户在客户端授权信息。

2.后端通过企业号拿到用户所有的信息 保存到数据库中，注意一定要和每个用户的userid相同

3.用户申请提现时，查找数据库里面的userid获取到它本身的openid。

以下是关键代码：

发送红包代码

public class AwardABonus {
public static String fun(String opid, int totalamount) {
String httpurl = "https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack";
String noncestr = 随机字符串;
String mchid = 商户号;

SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmssSSS");
String times = (df.format(new Date()) + (int) (Math.random() * 10.0D))
.toString();
String mchbillno = mchid + times;
String wxappid = "公众账号appid";
String nickname = "";
String key = "公众号key";
String reopenid = opid;
String sendname = "商户名称";
int minvalue = 100;
int maxvalue = 10000;
int totalnum = 1;//付款金额 分为单位
String wishing = "xxoo"; //红包名称
String clientip = "";//IP地址
String actname = "xxoo";//活动名称
String remark = "xxoo";//备注
String stringSignTemp = "act_name=" + actname + "&client_ip="
+ clientip + "&max_value=" + maxvalue + "&mch_billno="
+ mchbillno + "&mch_id=" + mchid + "&min_value=" + minvalue
+ "&nick_name=" + nickname + "&nonce_str=" + noncestr
+ "&re_openid=" + reopenid + "&remark=" + remark
+ "&send_name=" + sendname + "&total_amount=" + totalamount
+ "&total_num=" + totalnum + "&wishing=" + wishing
+ "&wxappid=" + wxappid + "&key=" + key;
String sign = MD5Tool.md5(stringSignTemp).toUpperCase();

String pr1 = "<xml><act_name>" + actname + "</act_name>"
+ "<nick_name>" + nickname + "</nick_name>" + "<client_ip>"
+ clientip + "</client_ip>" + "<total_amount>" + totalamount
+ "</total_amount>" + "<min_value>" + minvalue + "</min_value>"
+ "<max_value>" + maxvalue + "</max_value>" + "<total_num>"
+ totalnum + "</total_num>" + "<mch_billno>" + mchbillno
+ "</mch_billno>" + "<mch_id>" + mchid + "</mch_id>"
+ "<nonce_str>" + noncestr + "</nonce_str>" + "<re_openid>"
+ reopenid + "</re_openid>" + "<remark>" + remark + "</remark>"
+ "<send_name>" + sendname + "</send_name>" + "<wishing>"
+ wishing + "</wishing>" + "<wxappid>" + wxappid + "</wxappid>"
+ "<sign>" + sign + "</sign>" + "</xml>";
InputStream in = null;
StringBuilder sb = new StringBuilder();
HttpEntity entity = null;
try {
File file = new File(PathKit.getWebRootPath()
+ "\\cert\\apiclient_cert.p12");
FileInputStream fileInputStream = new FileInputStream(file);
KeyStore clientTrustKeyStore = KeyStore.getInstance("PKCS12");
clientTrustKeyStore.load(fileInputStream, mchid.toCharArray());
KeyManagerFactory kmf = KeyManagerFactory
.getInstance(KeyManagerFactory.getDefaultAlgorithm());
kmf.init(clientTrustKeyStore, mchid.toCharArray());
TrustManager[] tm = { new MyX509TrustManager() };
SSLContext sslContext = SSLContext.getInstance("TLSv1");
sslContext.init(kmf.getKeyManagers(), tm, new SecureRandom());
SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(
sslContext);
CloseableHttpClient httpclient = HttpClients.custom()
.setSSLSocketFactory(sslsf).build();
HttpPost httppost = new HttpPost(httpurl);
httppost.setEntity(new StringEntity(pr1, "utf-8"));
System.out.println(EntityUtils.toString(httppost.getEntity()));
CloseableHttpResponse response = httpclient.execute(httppost);
entity = response.getEntity();
in = entity.getContent();
byte[] bytes = new byte[1024];
int len = 0;
while ((len = in.read(bytes)) != -1)
sb.append(new String(bytes, 0, len));
} catch (Exception e) {
e.printStackTrace();

if (in != null)
try {
in.close();
EntityUtils.toString(entity);
} catch (IOException localIOException) {
} finally {
}
} finally {
if (in != null)
try {
in.close();
EntityUtils.toString(entity);
} catch (IOException localIOException1) {
} finally {
}
}
System.out.println(sb.toString());
return sb.toString();
}

通过企业号授权拿到AccessToken//appID 企业号  
//appID 企业号
public static String getAccessToken(String appID, String appScret) {
String setAccess_token = null;

String url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" +
appID + "&secret=" + appScret;
try {
URL getUrl = new URL(url);
HttpURLConnection http = (HttpURLConnection)getUrl
.openConnection();
http.setRequestMethod("GET");
http.setRequestProperty("Content-Type",
"application/x-www-form-urlencoded");
http.setDoOutput(true);
http.setDoInput(true);

http.connect();
InputStream is = http.getInputStream();
int size = is.available();
byte[] b = new byte[size];
is.read(b);

String message = new String(b, "UTF-8");

JSONObject json = JSONObject.parseObject(message);
System.out.println(json);
setAccess_token = json.getString("access_token");
Integer setExpires_in = new Integer(json.getString("expires_in"));
System.out.println(setAccess_token);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return setAccess_token;
}
}

获取公众号用户列表
public static List<String> getAllWeiXinUser(String accessToken) {
List openIds = new ArrayList();

String action = "https://api.weixin.qq.com/cgi-bin/user/get?access_token="
+ accessToken;
try {
URL urlGet = new URL(action);

HttpURLConnection http = (HttpURLConnection) urlGet
.openConnection();

http.setRequestMethod("GET");

http.setRequestProperty("Content-Type",
"application/x-www-form-urlencoded");

http.setDoOutput(true);

http.setDoInput(true);

System.setProperty("sun.net.client.defaultConnectTimeout", "30000");

System.setProperty("sun.net.client.defaultReadTimeout", "30000");

http.connect();

InputStream is = http.getInputStream();

int size = is.available();

byte[] jsonBytes = new byte[size];

is.read(jsonBytes);

String result = new String(jsonBytes, "UTF-8");
JSONObject jsonObj = new JSONObject(result);

System.out.println("users" + jsonObj.get("data"));

JSONObject json1 = new JSONObject(jsonObj.get("data").toString());

System.out.println(json1.toString());

JSONArray json2 = new JSONArray(json1.get("openid").toString());

for (int i = 0; i < json2.length(); i++) {
openIds.add(i, json2.getString(i));
}

} catch (Exception e) {
e.printStackTrace();
}

return openIds;
}