app的微信支付Java实现
首先我们需要拿到微信的商户号,appid,秘钥等信息。在微信支付自己账号下获取。
之后我们查看微信支付统一下单的api接口文档。
https://pay.weixin.qq.com/wiki/doc/api/app/app.php?chapter=9_1
具体中文注释查看此网站,我们看一下xml的demo
具体流程:
1:appid,mch_id(商户号),nonce_str(随机字字符串),body(内容),out_trade_no(商户订单号),fee_type(货币类型),total_fee(总金额),spbill_create_ip (终端IP:一般为服务器本机:127.0.0.1),notify_url(回调url),trade_type(交易类型:APP)这些参数生成签名(参数具体注释参看上面的网址),将生成的签名连同这些参数一起生成xml报文请求统一下单api
2:统一下单api成功后会返回prepayid(预支付交易会话标识),将prepayid,appid,partnerid(商户号),package(Sign=WXPay),noncestr,timestamp参数再次进行签名,再将签名,连同这些参数发送到app端供其调用完成。
流程比较啰嗦,上代码。
首先是一些工具类:
1: 自己微信支付基本信息类
public class ConfigUtil {
/**
* 服务号相关信息
*/
public final static String APPID = "";//服务号的应用号
public final static String MCH_ID = "";//商户号
public final static String API_KEY = "";//API密钥
public final static String SIGN_TYPE = "MD5";//签名加密方式
public final static String UNIFIED_ORDER_URL = "https://api.mch.weixin.qq.com/pay/unifiedorder";//请求下单的http
}
2 :签名类 utf-8格式
public static String createSign(String characterEncoding, SortedMap<Object, Object> parameters) {
StringBuffer sb = new StringBuffer();
Set es = parameters.entrySet();
Iterator it = es.iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
String k = (String) entry.getKey();
Object v = entry.getValue();
if (null != v && !"".equals(v)
&& !"sign".equals(k) && !"key".equals(k)) {
sb.append(k + "=" + v + "&");
}
}
sb.append("key=" + ConfigUtil.API_KEY);
String sign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toUpperCase();
return sign;
}
3:将map数组拼装成xml
public static String getRequestXml(SortedMap<Object, Object> parameters) {
StringBuffer sb = new StringBuffer();
sb.append("<xml>");
Set es = parameters.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 ("attach".equalsIgnoreCase(k) || "body".equalsIgnoreCase(k)) {
sb.append("<" + k + ">" + "<![CDATA[" + v + "]]></" + k + ">");
} else {
sb.append("<" + k + ">" + v + "</" + k + ">");
}
}
sb.append("</xml>");
return sb.toString();
}
4: SSL协议发起http请求
/**
* 发送https请求
*
* @param requestUrl 请求地址
* @param requestMethod 请求方式(GET、POST)
* @param outputStr 提交的数据
* @return 返回微信服务器响应的信息
*/
public static String httpsRequest(String requestUrl, String requestMethod, String outputStr) {
try {
// 创建SSLContext对象,并使用我们指定的信任管理器初始化
TrustManager[] tm = {new MyX509TrustManager()};
SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");
sslContext.init(null, tm, new java.security.SecureRandom());
// 从上述SSLContext对象中得到SSLSocketFactory对象
SSLSocketFactory ssf = sslContext.getSocketFactory();
URL url = new URL(requestUrl);
HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
//conn.setSSLSocketFactory(ssf);
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
// 设置请求方式(GET/POST)
conn.setRequestMethod(requestMethod);
conn.setRequestProperty("content-type", "application/x-www-form-urlencoded");
// 当outputStr不为null时向输出流写数据
if (null != outputStr) {
OutputStream outputStream = conn.getOutputStream();
// 注意编码格式
outputStream.write(outputStr.getBytes("UTF-8"));
outputStream.close();
}
// 从输入流读取返回内容
InputStream inputStream = conn.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "UTF-8");
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String str = null;
StringBuffer buffer = new StringBuffer();
while ((str = bufferedReader.readLine()) != null) {
buffer.append(str);
}
// 释放资源
bufferedReader.close();
inputStreamReader.close();
inputStream.close();
inputStream = null;
conn.disconnect();
return buffer.toString();
} catch (ConnectException ce) {
// log.error("连接超时:{}", ce);
} catch (Exception e) {
// log.error("https请求异常:{}", e);
}
return null;
}
5:生成随机字符串
public static String CreateNoncestr() {
String chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
String res = "";
for (int i = 0; i < 16; i++) {
Random rd = new Random();
res += chars.charAt(rd.nextInt(chars.length() - 1));
}
return res;
}
6 将返回的xml 转换成map数组
/**
* 解析xml,返回第一级元素键值对。如果第一级元素有子节点,则此节点的值是子节点的xml数据。
*
* @param strxml
* @return
* @throws JDOMException
* @throws IOException
*/
public static Map doXMLParse(String strxml) throws JDOMException, IOException {
strxml = strxml.replaceFirst("encoding=\".*\"", "encoding=\"UTF-8\"");
if (null == strxml || "".equals(strxml)) {
return null;
}
Map m = new HashMap();
InputStream in = new ByteArrayInputStream(strxml.getBytes("UTF-8"));
SAXBuilder builder = new SAXBuilder();
Document doc = builder.build(in);
Element root = doc.getRootElement();
List list = root.getChildren();
Iterator it = list.iterator();
while (it.hasNext()) {
Element e = (Element) it.next();
String k = e.getName();
String v = "";
List children = e.getChildren();
if (children.isEmpty()) {
v = e.getTextNormalize();
} else {
v = XMLUtil.getChildrenText(children);
}
m.put(k, v);
}
//关闭流
in.close();
return m;
}
基本工具类都在这里,接下来就是下单的controller类,
因为含有业务逻辑的代码就不上了,直接贴下单的那部分
//测试环境
//微信默认从单位为分,所以用此方法将单位调整成元
int price100 = new BigDecimal(price).multiply(new BigDecimal(100)).intValue();
SortedMap<Object, Object> parameters = new TreeMap<Object, Object>();
parameters.put("appid", ConfigUtil.APPID);
parameters.put("mch_id", ConfigUtil.MCH_ID);
parameters.put("nonce_str", noPayOrder.getWxOutTradeNo());
parameters.put("body", message);
parameters.put("out_trade_no", UUID.randomUUID().toString().substring(0, 15)); //订单id
parameters.put("fee_type", "CNY");
parameters.put("total_fee", String.valueOf(price100));
parameters.put("spbill_create_ip", "127.0.0.1");
parameters.put("notify_url", returnUrl);
parameters.put("trade_type", "APP");
//设置签名
String sign = PayCommonUtil.createSign("UTF-8", parameters);
parameters.put("sign", sign);
//封装请求参数结束
String requestXML = PayCommonUtil.getRequestXml(parameters);
//调用统一下单接口
String result = PayCommonUtil.httpsRequest(ConfigUtil.UNIFIED_ORDER_URL, "POST", requestXML);
System.out.println("\n" + result);
try {
/**统一下单接口返回正常的prepay_id,再按签名规范重新生成签名后,将数据传输给APP。参与签名的字段名为appId,partnerId,prepayId,nonceStr,timeStamp,package。注意:package的值格式为Sign=WXPay**/
Map<String, String> map = XMLUtil.doXMLParse(result);
SortedMap<Object, Object> parameterMap2 = new TreeMap<Object, Object>();
parameterMap2.put("appid", ConfigUtil.APPID);
parameterMap2.put("partnerid", ConfigUtil.MCH_ID);
parameterMap2.put("prepayid", map.get("prepay_id"));
parameterMap2.put("package", "Sign=WXPay");
parameterMap2.put("noncestr", PayCommonUtil.CreateNoncestr());
//本来生成的时间戳是13位,但是ios必须是10位,所以截取了一下
parameterMap2.put("timestamp", Long.parseLong(String.valueOf(System.currentTimeMillis()).toString().substring(0, 10)));
String sign2 = PayCommonUtil.createSign("UTF-8", parameterMap2);
parameterMap2.put("sign", sign2);//此 parameterMap2内容送到ios调用就可以了
/* landlordNew.setWxSign(sign2);
this.landlordNewService.update(landlordNew);*/
resultMap.put("code", "200");
resultMap.put("msg", parameterMap2);
} catch (JDOMException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
将最后生成的parameterMap2内容送到ios调用就完成支付调用。
好了支付调用成功了,用户付完款肯定是需要回调来完成支付成功后的业务逻辑了(用户成功支付后,微信会主动调用我们预先设置好的url(需要外网链接),同时微信会将:商户订单号,微信支付订单号发送给我们,我们可以通过这些来完成业务逻辑)下面为回调接口代码:
/**
* 微信异步通知 (签约支付)
*/
@RequestMapping("/wxNotifySignContract")
public void wxNotifySignContract(HttpServletRequest request, HttpServletResponse response) throws IOException, JDOMException {
try {
//读取参数
InputStream inputStream;
StringBuffer sb = new StringBuffer();
inputStream = request.getInputStream();
String s;
BufferedReader in = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
while ((s = in.readLine()) != null) {
sb.append(s);
}
in.close();
inputStream.close();
//解析xml成map
Map<String, String> m = new HashMap<String, String>();
m = XMLUtil.doXMLParse(sb.toString());
for (Object keyValue : m.keySet()) {
System.out.println(keyValue + "=" + m.get(keyValue));
}
//过滤空 设置 TreeMap
SortedMap<Object, Object> packageParams = new TreeMap<Object, Object>();
Iterator it = m.keySet().iterator();
while (it.hasNext()) {
String parameter = (String) it.next();
String parameterValue = m.get(parameter);
String v = "";
if (null != parameterValue) {
v = parameterValue.trim();
}
packageParams.put(parameter, v);
}
//判断签名是否正确
String resXml = "";
if (PayCommonUtil.isTenpaySign("UTF-8", packageParams)) {
if ("SUCCESS".equals((String) packageParams.get("result_code"))) {
// 这里是支付成功
//////////执行自己的业务逻辑////////////////
String appid = (String) packageParams.get("appid");//appid
String sign = (String) packageParams.get("sign");//签名
String total_fee = (String) packageParams.get("total_fee");//总金额
String mch_id = (String) packageParams.get("mch_id"); //商户号
String openid = (String) packageParams.get("openid"); //用户标识
//微信回调 商户号回调的商户订单号是out_trade_no
//(需要唯一,同一个订单号执行下单接口会报错),这里笔者使用
//nonce_str作为订单号,后续还需要改动。这个字段官方文档解释为随机字
//符串,但后来发现回调的时候返回的nonce_str跟下单填进去的nonce_str
//一致,所以暂时用来当订单号了。)
String out_trade_no = (String) packageParams.get("nonce_str"); //商户订单号
String transaction_id = (String) packageParams.get("transaction_id"); //微信支付订单号
this.contractpayReturn(appid, sign, total_fee, mch_id, openid, out_trade_no, transaction_id);
resXml = "<xml>" + "<return_code><![CDATA[SUCCESS]]></return_code>"
+ "<return_msg><![CDATA[OK]]></return_msg>" + "</xml> ";
} else {
logger.info("支付失败,错误信息:" + packageParams.get("err_code"));
resXml = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>"
+ "<return_msg><![CDATA[报文为空]]></return_msg>" + "</xml> ";
}
} else {
resXml = "<xml>" + "<return_code><![CDATA[FAIL]]></return_code>"
+ "<return_msg><![CDATA[通知签名验证失败]]></return_msg>" + "</xml> ";
logger.info("通知签名验证失败");
}
//------------------------------
//处理业务完毕
//------------------------------
BufferedOutputStream out = new BufferedOutputStream(
response.getOutputStream());
out.write(resXml.getBytes());
out.flush();
out.close();
logger.error("微信回调接口成功--------");
} catch (Exception ex) {
logger.error(ex.toString());
ExceptionUntil.setLogger(logger, ex);
logger.error("微信回调接口失败--------");
}
实现结果展示
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