小程序之红包接口开发的示例分析

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; } }

@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); }

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