Example code for developing red envelope interface of mini program

WeChat red envelope interface development is actually not difficult. Don’t be frightened by its appearance. Please refer to several versions of the answers on the Internet~ I specially share the following

Red envelope packaging tools:

package com.tepusoft.web.weixin.utils;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.security.KeyStore;
import java.security.NoSuchAlgorithmException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Random;
import java.util.Set;
import java.util.SortedMap;
import java.util.TreeMap;
import java.util.UUID;
import javax.net.ssl.SSLContext;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.conn.ssl.SSLContexts;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
/**
 * @author wangiegie
 * @date 2015年10月19日下午2:07:11
 * @description
 */
public class HongBaoUtil {
public static final String MCH_ID = ""; // 商户号
public static final String WXAPPID = ""; // 公众账号appid
public static final String NICK_NAME = "潍坊特普软件开发有限公司"; // 提供方名称
public static final String SEND_NAME = "潍坊特普软件"; // 商户名称
public static final int MIN_VALUE = ; // 红包最小金额 单位:分
public static final int MAX_VALUE = ; // 红包最大金额 单位:分
public static final int TOTAL_NUM = 1; // 红包发放人数
public static final String WISHING = "生日快乐"; // 红包祝福语
public static final String CLIENT_IP = "182.41.214.82"; // 调用接口的机器IP
public static final String ACT_NAME = "??"; // 活动名称
public static final String REMARK = "红包测试"; // 备注
public static final String KEY = ""; // 秘钥
public static final int FAIL = 0; // 领取失败
public static final int SUCCESS = 1; // 领取成功
public static final int LOCK = 2; // 已在余额表中锁定该用户的余额,防止领取的红包金额大于预算
/**
 * 对请求参数名ASCII码从小到大排序后签名
 * 
 * @param params
 */
public static void sign(SortedMap<String, String> params) {
Set<Entry<String, String>> entrys = params.entrySet();
Iterator<Entry<String, String>> it = entrys.iterator();
StringBuffer result = new StringBuffer();
while (it.hasNext()) {
Entry<String, String> entry = it.next();
result.append(entry.getKey()).append("=").append(entry.getValue()).append("&");
}
result.append("key=").append(KEY);
params.put("sign", DigestUtils.md5Hex(result.toString()));
}
/**
 * 生成提交给微信服务器的xml格式参数
 * 
 * @param params
 * @return
 */
public static String getRequestXml(SortedMap<String, String> params) {
StringBuffer sb = new StringBuffer();
sb.append("<xml>");
Set es = params.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 ("nick_name".equalsIgnoreCase(k) || "send_name".equalsIgnoreCase(k) || "wishing".equalsIgnoreCase(k)
|| "act_name".equalsIgnoreCase(k) || "remark".equalsIgnoreCase(k) || "sign".equalsIgnoreCase(k)) {
sb.append("<" + k + ">" + "<![CDATA[" + v + "]]></" + k + ">");
} else {
sb.append("<" + k + ">" + v + "</" + k + ">");
}
}
sb.append("</xml>");
return sb.toString();
}
/**
 * 创建map
 * 
 * @param billNo
 * @param openid
 * @param userId
 * @param amount
 * @return
 */
public static SortedMap<String, String> createMap(String openid, String userId, int amount) {
SortedMap<String, String> params = new TreeMap<String, String>();
params.put("wxappid", WXAPPID);
params.put("nonce_str", createNonceStr());
params.put("mch_billno", createBillNo(userId));
params.put("mch_id", MCH_ID);
params.put("nick_name", NICK_NAME);
params.put("send_name", SEND_NAME);
params.put("re_openid", openid);
params.put("total_amount", amount + "");
params.put("min_value", amount + "");
params.put("max_value", amount + "");
params.put("total_num", TOTAL_NUM + "");
params.put("wishing", WISHING);
params.put("client_ip", CLIENT_IP);
params.put("act_name", ACT_NAME);
params.put("remark", REMARK);
return params;
}
/**
 * 生成随机字符串
 * 
 * @return
 */
public static String createNonceStr() {
return UUID.randomUUID().toString().toUpperCase().replace("-", "");
}
/**
 * 生成商户订单号
 * 
 * @param mch_id
 *            商户号
 * @param userId
 *            该用户的userID
 * @return
 */
public static String createBillNo(String userId) {
// 组成： mch_id+yyyymmdd+10位一天内不能重复的数字
// 10位一天内不能重复的数字实现方法如下:
// 因为每个用户绑定了userId,他们的userId不同,加上随机生成的(10-length(userId))可保证这10位数字不一样
Date dt = new Date();
SimpleDateFormat df = new SimpleDateFormat("yyyymmdd");
String nowTime = df.format(dt);
int length = 10 - userId.length();
return MCH_ID + nowTime + userId + getRandomNum(length);
}
/**
 * 生成特定位数的随机数字
 * 
 * @param length
 * @return
 */
private 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;
}
/**
 * post提交到微信服务器
 *
 * @param requestXML
 * @param instream  传入的在微信支付的PKCS12证书的位置
 * @return
 * @throws NoSuchAlgorithmException
 * @throws CertificateException
 * @throws IOException
 * @throws KeyManagementException
 * @throws UnrecoverableKeyException
 * @throws KeyStoreException
 */
public static String post(String requestXML, InputStream instream) throws Exception {
KeyStore keyStore = KeyStore.getInstance("PKCS12");
try {
keyStore.load(instream, MCH_ID.toCharArray());
} finally {
instream.close();
}
SSLContext sslcontext = SSLContexts.custom().loadKeyMaterial(keyStore, MCH_ID.toCharArray()).build();
SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslcontext, new String[] { "TLSv1" }, null,
SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER);
CloseableHttpClient httpclient = HttpClients.custom().setSSLSocketFactory(sslsf).build();
String result = "";
try {
HttpPost httpPost = new HttpPost("https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack");
StringEntity reqEntity = new StringEntity(requestXML, "utf-8"); // 如果此处编码不对，可能导致客户端签名跟微信的签名不一致
reqEntity.setContentType("application/x-www-form-urlencoded");
httpPost.setEntity(reqEntity);
CloseableHttpResponse response = httpclient.execute(httpPost);
try {
HttpEntity entity = response.getEntity();
if (entity != null) {
BufferedReader bufferedReader = new BufferedReader(
new InputStreamReader(entity.getContent(), "UTF-8"));
String text;
while ((text = bufferedReader.readLine()) != null) {
result += text;
}
}
EntityUtils.consume(entity);
} finally {
response.close();
}
} finally {
httpclient.close();
}
return result;
}
}

Call:

@Test
public void testHongBao() throws Exception {
SortedMap<String, String> sortedMap = HongBaoUtil.createMap(openId, userId, money);
HongBaoUtil.sign(sortedMap);
String postXML = HongBaoUtil.getRequestXml(sortedMap);
FileInputStream instream = new FileInputStream(new File("证书文件地址"));
HongBaoUtil.post(postXML, instream);
}

Okay...Don’t be fooled by so many configurations and parameters in the WeChat payment backend, WeChat red envelope development is So simple ~

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