本次是关于统一下单的回调,支付成功后需要通知告知微信服务器。这里有一点必须注意,为后期退款功能提供保障,在回调中处理业务逻辑的时候一定要将商户订单号->订单金额 total_fee ,流水号 transaction_id保存下来,退款功能一定要用。
代码是经过测试修改的,可直接使用,统一下单请关注上一篇文章。
1.Controller层
@RequestMapping("/wxNotify")
public synchronized ResponseEntity<ResponseModel> wxNotifySignContract(HttpServletRequest request, HttpServletResponse response) throws IOException, JDOMException, JSONException, org.json.JSONException {
ResponseModel responseModel = new ResponseModel();
//微信支付
//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>();
try {
m = XMLUtil.xmlToMap(sb.toString());
} catch (Exception e) {
e.printStackTrace();
}
//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);
}
// 账号信息
String key = WechatConfig.key; // key
System.out.println(packageParams);
//判断签名是否正确
if (PayCommonUtil.isTenpaySign("UTF-8", packageParams, key)) {
// //------------------------------
// //处理业务开始
// //------------------------------
String resXml = "";
if ("SUCCESS".equals((String) packageParams.get("result_code"))) {
// 这里是支付成功
//执行自己的业务逻辑
//微信支付分配的商户号
//这里的参数获取只提供于参考获取数值,并非必须填写。
String mch_id = (String) packageParams.get("mch_id");
String openid = (String) packageParams.get("openid");
//用户是否关注公众账号,Y-关注,N-未关注
String is_subscribe = (String) packageParams.get("is_subscribe");
//交易订单号ID
String outTradeNo1 = (String) packageParams.get("out_trade_no");
//交易订单号
String transactionId= (String) packageParams.get("transaction_id");
//订单总金额,单位为<<<分>>>
String totalFee = (String) packageParams.get("total_fee");
//--------------------
//这里写自己的业务逻辑处理
//--------------------
//通知微信.异步确认成功.必写.不然会一直通知后台.八次之后就认为交易失败了.
resXml = " ";
} else {
System.out.println("支付失败,错误信息:" + packageParams.get("err_code"));
resXml = "" + " "
+ " " + " ";
}
//------------------------------
//处理业务完毕
//------------------------------
BufferedOutputStream out = new BufferedOutputStream(
response.getOutputStream());
out.write(resXml.getBytes());
out.flush();
out.close();
} else {
System.out.println("通知签名验证失败");
}
responseModel.setMessage("SUCCESS");
return ResponseEntity.ok(responseModel);
}
2.WechatConfig 配置
需要注意的是,这里的回调地址如果你是本地测试,你只需要使用网络穿透工具就行,如果是线上服务,就需要https协议的,外网可访问地址。
public class WechatConfig {
//小程序appid
public static final String Appid = "微信商户平台查询"; //
//微信小程序appsecret
public static String appSecret = "微信商户平台查询";//
//微信支付的商户id
public static final String mch_id = "微信商户平台查询";//
//微信支付的商户密钥
public static final String key = "微信商户平台查询";//
//支付成功后的服务器回调url,这里填PayController里的回调函数地址
public static final String notify_url = "https://api.mch.weixin.qq.com/secapi/pay/wxNotify"; //服务器写日志
//签名方式,固定值
public static final String SIGNTYPE = "MD5";
//自己本机IP
public static final String spbill_create_ip = "127.0.0.1";
//交易类型,小程序支付的固定值为JSAPI
public static final String TRADETYPE = "JSAPI";
}
3.XMLUtil工具类
/**
* XML格式字符串转换为Map
*
* @param strXML XML字符串
* @return XML数据转换后的Map
* @throws Exception
*/
public static Map<String, String> xmlToMap(String strXML) throws Exception {
try {
Map<String, String> data = new HashMap<String, String>();
DocumentBuilder documentBuilder = WXPayXmlUtil.newDocumentBuilder();
String info=strXML.trim();
InputStream stream = new ByteArrayInputStream(info.getBytes("UTF-8"));
org.w3c.dom.Document doc = documentBuilder.parse(stream);
doc.getDocumentElement().normalize();
NodeList nodeList = doc.getDocumentElement().getChildNodes();
for (int idx = 0; idx < nodeList.getLength(); ++idx) {
Node node = nodeList.item(idx);
if (node.getNodeType() == Node.ELEMENT_NODE) {
org.w3c.dom.Element element = (org.w3c.dom.Element) node;
data.put(element.getNodeName(), element.getTextContent());
}
}
try {
stream.close();
} catch (Exception ex) {
// do nothing
}
return data;
} catch (Exception ex) {
WXPayUtil.getLogger().warn("Invalid XML, can not convert to map. Error message: {}. XML content: {}", ex.getMessage(), strXML);
throw ex;
}
}
WXPayUtil.getLogger()
/**
* 日志
* @return
*/
public static Logger getLogger() {
Logger logger = LoggerFactory.getLogger("wxpay java sdk");
return logger;
}
4.PayCommonUtil工具,用于校验签名参数
/**
* 是否签名正确,规则是:按参数名称a-z排序,遇到空值的参数不参加签名。
* @return boolean
*/
public static boolean isTenpaySign(String characterEncoding, SortedMap<Object, Object> packageParams, String API_KEY) {
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(!"sign".equals(k) && null != v && !"".equals(v)) {
sb.append(k + "=" + v + "&");
}
}
sb.append("key=" + API_KEY);
//算出摘要
String mysign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toLowerCase();
String tenpaySign = ((String)packageParams.get("sign")).toLowerCase();
return tenpaySign.equals(mysign);
}
5.WXPayXmlUtil
public final class WXPayXmlUtil {
public static DocumentBuilder newDocumentBuilder() throws ParserConfigurationException {
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
documentBuilderFactory.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
documentBuilderFactory.setFeature("http://xml.org/sax/features/external-general-entities", false);
documentBuilderFactory.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
documentBuilderFactory.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
documentBuilderFactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
documentBuilderFactory.setXIncludeAware(false);
documentBuilderFactory.setExpandEntityReferences(false);
return documentBuilderFactory.newDocumentBuilder();
}
public static Document newDocument() throws ParserConfigurationException {
return newDocumentBuilder().newDocument();
}
}
下一篇,带你了解小程序线上退款以及本地退款使用,使用流对证书的存放获取。