微信支付java版V3验证数据合法性(Deom)

InputStream inStream = request.getInputStream();ByteArrayOutputStream outSteam = new ByteArrayOutputStream();byte[] buffer = new byte[1024];int len = 0;while ((len = inStream.read(buffer)) != -1) {outSteam.write(buffer, 0, len);}outSteam.close();inStream.close();/** 获取微信调用notify_url的返回XML信息 */String result = new String(outSteam.toByteArray(), "utf-8");

/*** 传入微信回调返回的XML信息* 以Map形式返回便于取值* dom4j解析XML,返回第一级元素键值对。如果第一级元素有子节点，则此节点的值为空* @param strXML* @return* @throws DocumentException */@SuppressWarnings("rawtypes")public static SortedMap<String, String> dom4jXMLParse(String strXML) throws DocumentException {SortedMap<String, String> smap = new TreeMap<String, String>();Document doc = DocumentHelper.parseText(strXML);Element root = doc.getRootElement();for (Iterator iterator = root.elementIterator(); iterator.hasNext();) {Element e = (Element) iterator.next();smap.put(e.getName(), e.getText());}return smap;}

/*** 是否微信V3签名,规则是:按参数名称a-z排序,遇到空值的参数不参加签名* 传入微信返回信息解析后的SortedMap格式参数数据* 验证消息是否是微信发出的合法消息* @param smap* @param apiKey 设置的密钥* @return 验证结果*/@SuppressWarnings("rawtypes")public static boolean isWechatSign(SortedMap<String, String> smap,String apiKey) {StringBuffer sb = new StringBuffer();Set es = smap.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) && !"key".equals(k)) {sb.append(k + "=" + v + "&");}}sb.append("key=" + apiKey);/** 验证的签名 */String sign = MD5Util.MD5Encode(sb.toString(), "utf-8").toUpperCase();/** 微信端返回的合法签名 */String validSign = ((String) smap.get("sign")).toUpperCase();return validSign.equals(sign);}