依据：https://pay./wiki/doc/api/tools/cash_coupon.php?chapter=13_4&index=3
有不明白的地方，可以评论问我
1.传参：
// 发送红包接口public static String sendRedPack(String openId, String sendName, String wishing, String actName, String remark, String totalAmount) throws UnknownHostException {String orderNNo = WXRedPackUtils.getOrderNo() ; Map<String, Object> map = new HashMap<String, Object>();map.put("nonce_str", WXRedPackUtils.buildRandom());//随机字符串map.put("mch_billno", orderNNo);//商户订单map.put("mch_id", mchId);//商户号map.put("wxappid", "wxxxxxxxxxxxxxxx");//公众号appidmap.put("send_name", sendName);//发送名map.put("re_openid", openId);//用户openidmap.put("total_amount", totalAmount);//付款金额 单位分 map.put("total_num", 1);//红包发送总人数map.put("wishing", wishing);//红包祝福语map.put("client_ip", InetAddress.getLocalHost());//发送端ip地址map.put("act_name", actName);//活动名称map.put("remark", remark);//备注//map.put("scene_id","PRODUCT_1"); //红包金额大于200时，选择使用场景 1-8map.put("sign", WXRedPackUtils.createSign(map));//签名String result = "";try {result = WXRedPackUtils.doSendMoney(url, WXRedPackUtils.createXML(map));} catch (Exception e) {e.printStackTrace();}System.out.println("result:"+result);String resultMsg = result.substring(result.indexOf("<return_msg><![CDATA[")+21, result.lastIndexOf("]]></return_msg>"));return resultMsg;}
2.签名：
第一步，设所有发送或者接收到的数据为集合M，将集合M内非空参数值的参数按照参数名ASCII码从小到大排序（字典序），使用URL键值对的格式（即key1=value1&key2=value2…）拼接成字符串stringA
第二步，在stringA最后拼接上key得到stringSignTemp字符串，并对stringSignTemp进行MD5运算，再将得到的字符串所有字符转换为大写，得到sign值signValue。
private static String charset = "UTF-8";//微信支付商户号private static String partner = "填自己的"; //微信支付平台API密钥private static String partnerkey = "填自己的";//证件存储路径private static String KEYSTORE_FILE = "填自己的";//默认为微信支付商户号private static String KEYSTORE_PASSWORD = "填自己的";public static String createSign(Map<String, Object> map) {SortedMap<String, String> packageParams = new TreeMap<String, String>();for (Map.Entry<String, Object> m : map.entrySet()) {packageParams.put(m.getKey(), m.getValue().toString());}StringBuffer sb = new StringBuffer();Set<?> es = packageParams.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 (!StringUtils.isEmpty(v) && !"sign".equals(k) && !"key".equals(k)) {sb.append(k + "=" + v + "&");}}sb.append("key=" + partnerkey);String sign = MD5Util.MD5Encode(sb.toString(), charset).toUpperCase();return sign;}
3.调用证书，并发送：
public static String doSendMoney(String url, String data) throws Exception {KeyStore keyStore = KeyStore.getInstance("PKCS12");FileInputStream instream = new FileInputStream(new File(KEYSTORE_FILE));//P12文件目录//InputStream instream = RedPackUtils.class.getResourceAsStream("/apiclient_cert.p12");try {keyStore.load(instream, KEYSTORE_PASSWORD.toCharArray());//默认密码为微信支付商户号} finally {instream.close();}// Trust own CA and all self-signed certsSSLContext sslcontext = SSLContexts.custom().loadKeyMaterial(keyStore, KEYSTORE_PASSWORD.toCharArray()).build();// Allow TLSv1 protocol onlySSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslcontext, new String[] { "TLSv1" }, null,SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER);CloseableHttpClient httpclient = HttpClients.custom().setSSLSocketFactory(sslsf).build();try {HttpPost httpost = new HttpPost(url);httpost.addHeader("Connection", "keep-alive");httpost.addHeader("Accept", "*/*");httpost.addHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");httpost.addHeader("Host", "api.mch.");httpost.addHeader("X-Requested-With", "XMLHttpRequest");httpost.addHeader("Cache-Control", "max-age=0");httpost.addHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0) ");httpost.setEntity(new StringEntity(data, "UTF-8"));CloseableHttpResponse response = httpclient.execute(httpost);try {HttpEntity entity = response.getEntity();String jsonStr = EntityUtils.toString(response.getEntity(),"UTF-8");EntityUtils.consume(entity);return jsonStr;} finally {response.close();}} finally {httpclient.close();}}
3.还有一些在你传参的时候要用到的方法：
//随机16为数值public static String buildRandom() {//生成3位随机数int rRum = new java.util.Random().nextInt(900)+100;//当前时间的13位数String time = String.valueOf(System.currentTimeMillis())+String.valueOf(rRum);return time;}//生成订单号public static String getOrderNo() {String order = partner+ new SimpleDateFormat("yyyyMMdd").format(new Date());Random r = new Random();for (int i = 0; i < 10; i++) {order += r.nextInt(9);}return order;}//创建签名所需要的参数xml格式public static String createXML(Map<String, Object> map){String xml = "<xml>";Set<String> set = map.keySet();Iterator<String> i = set.iterator();while(i.hasNext()){String str = i.next();xml+="<"+str+">"+"<![CDATA["+map.get(str)+"]]>"+"</"+str+">";}xml+="</xml>";return xml;}
