/*** 付款页面* @param request* @param response* @return* @throws Exception*/@RequestMapping("/callback")public String pay(HttpServletRequest request, HttpServletResponse response) throws Exception {LogUtils.trace("-----------------------/pay/callback/--------------------------------");/*** 获得code和state字段*/String code = request.getParameter("code");String state = request.getParameter("state");int total = (int)(Float.parseFloat(state)*100);/*** 获取openId*/WxOauthAccessToken oauthAccessToken = PayUtil.getOauthAccessToken(code);String openId = oauthAccessToken.getOpenId();/*** 执行统一下单接口，初始化各参数*/Date now = new Date();SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMddHHmmss");String outTradeNo = "NO" + dateFormat.format( now );String body = "测试";String nonceStr = StringUtil.generateRandomString(16);
//        String spBillCreateIP = ReqUtils.getRealIp(request);String spBillCreateIP = "127.0.0.1";//初始化传入参数JsApiReqData jsApiReqData =new JsApiReqData(body,nonceStr,outTradeNo,total,spBillCreateIP, openId);String info = MobiMessage.JsApiReqData2xml(jsApiReqData).replaceAll("__", "_");LogUtils.trace(info);String url = "https://api.mch.weixin.qq.com/pay/unifiedorder";StringBuffer sb = JsApiReqUtils.httpsRequest(url, "POST", info);if (!"".equals(sb.toString())) {/*** 得到预支付ID，即prepay_id*/Map<String, String> getMap = MobiMessage.parseXml(new String(sb.toString().getBytes(), "utf-8"));LogUtils.trace(getMap);String prepay_id = getMap.get("prepay_id");LogUtils.trace(prepay_id);// 生成支付签名,这个签名给微信支付的调用使用Integer timeStamp = DateUtils.getCurrentTimestamp();JsApiToJsData jsApiToJsData = new JsApiToJsData(timeStamp, nonceStr,prepay_id);String redirectUrl = "/#pay?appId=APPID&timeStamp=TIMESTAMP&nonceStr=NONCESTR&prepay_id=PREPAYID&signType=MD5&paySign=SIGN";redirectUrl = redirectUrl.replace("APPID", jsApiToJsData.getAppid()).replace("TIMESTAMP", jsApiToJsData.getTimeStamp() + "").replace("NONCESTR", jsApiToJsData.getNonce_str()).replace("PREPAYID", jsApiToJsData.getPrepay_id()).replace("SIGN", jsApiToJsData.getSign());LogUtils.trace(redirectUrl);return "redirect:" + redirectUrl ;} else {LogUtils.trace("统一下单失败！");return "";}}

/*** 请求公众号支付API需要提交的数据* @author Created by fenghui.* @date Created on 2016/09/06/9:28**/
public class JsApiReqData {//每个字段具体的意思请查看API文档private String appid = "";private String mch_id = "";private String body = "";private String nonce_str = "";private String sign = "";private String notify_url = "";private String out_trade_no = "";private String spbill_create_ip = "";private Integer total_fee = 0;private String trade_type = "";private String openid = "";/*** @param body   要支付的商品的描述信息，用户会在支付成功页面里看到这个信息* @param nonceStr  随机字符串，不长于32 位* @param outTradeNo  商户系统内部的订单号,32个字符内可包含字母, 确保在商户系统唯一* @param totalFee   订单总金额，单位为“分”，只能整数* @param spBillCreateIP  订单生成的机器IP* @param openid  用户标识,trade_type=JSAPI，此参数必传，用户在商户appid下的唯一标识。*/public JsApiReqData(String body,String nonceStr,String outTradeNo,Integer totalFee,String spBillCreateIP,String openid){//微信分配的公众号ID（开通公众号之后可以获取到）setAppid(WxConfigure.AppId);//微信支付分配的商户号ID（开通公众号的微信支付功能之后可以获取到）setMch_id(WxConfigure.Mch_id);//接收微信支付异步通知后的回调地址setNotify_url(WxConfigure.Notify_url);//交易类型,取值如下：JSAPI，NATIVE，APP，setTrade_type(WxConfigure.Trade_type);//要支付的商品的描述信息，用户会在支付成功页面里看到这个信息setBody(body);//商户系统内部的订单号,32个字符内可包含字母, 确保在商户系统唯一setOut_trade_no(outTradeNo);//订单总金额，单位为“分”，只能整数setTotal_fee(totalFee);//订单生成的机器IPsetSpbill_create_ip(spBillCreateIP);//随机字符串，不长于32 位setNonce_str(nonceStr);//用户标识,trade_type=JSAPI，此参数必传，用户在商户appid下的唯一标识。setOpenid(openid);//根据API给的签名规则进行签名SortedMap<Object, Object> parameters = new TreeMap<Object, Object>();parameters.put("appid", appid);parameters.put("mch_id", mch_id);parameters.put("nonce_str", nonce_str);parameters.put("body", body);parameters.put("out_trade_no", out_trade_no);parameters.put("notify_url", notify_url);parameters.put("total_fee", total_fee);parameters.put("spbill_create_ip", spbill_create_ip);parameters.put("trade_type", trade_type);parameters.put("openid", openid);String sign = DictionarySort.createSign(parameters);//根据给的签名规则进行签名setSign(sign);//把签名数据设置到Sign这个属性中}

public class JsApiToJsData {//每个字段具体的意思请查看API文档private String appid = "";private Integer timeStamp = 0;private String nonce_str = "";private String sign = "";private String prepay_id = "";private String signType = "";/*** @param nonceStr  随机字符串，不长于32 位*/public JsApiToJsData(Integer timeStamp,String nonceStr,String prepay_id){//微信分配的公众号ID（开通公众号之后可以获取到）setAppid(WxConfigure.AppId);setTimeStamp(timeStamp);setNonce_str(nonceStr);setPrepay_id(prepay_id);setSignType("MD5");//根据API给的签名规则进行签名SortedMap<Object,Object> parameters = new TreeMap<Object,Object>();parameters.put("appId", appid);parameters.put("timeStamp", timeStamp);parameters.put("nonceStr", nonceStr);parameters.put("package", "prepay_id=" + prepay_id);parameters.put("signType",signType);//根据给的签名规则进行签名String sign = DictionarySort.createSign(parameters);setSign(sign);//把签名数据设置到Sign这个属性中}

类StringUtil主要用于产生随机字符串。

public class StringUtil {public static String generateRandomString() {return generateRandomString(16);}public static String generateRandomString(int length) {String seekChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";int seekLength = seekChars.length();String str = "";for (int i = 0; i < length; i++) {str += seekChars.charAt((int) (Math.random() * seekLength));}return str;}public static String generateRandomNumber() {return generateRandomNumber(6);}public static String generateRandomNumber(int length) {String seekChars = "0123456789";int seekLength = seekChars.length();String str = "";for (int i = 0; i < length; i++) {str += seekChars.charAt((int) (Math.random() * seekLength));}return str;}
}

类JsApiReqUtils用于获得 网页支付提交用户端ip和触发http请求。

public class JsApiReqUtils {//获取真实IPpublic static String getRealIp(HttpServletRequest request) {if (request == null) {LogUtils.error("getRealIp request null");return "0.0.0.0";}String realIp = request.getHeader("X-Real-IP");LogUtils.trace("realIp:" + realIp);if (realIp != null && realIp.length() > 0) {return realIp;}realIp = request.getHeader("X-Forwarded-For");LogUtils.trace("realIp2:" + realIp);if (realIp != null && realIp.length() > 0) {return realIp;}return request.getRemoteAddr();}public static StringBuffer httpsRequest(String requestUrl, String requestMethod, String output)throws Exception {HttpURLConnection conn = (HttpURLConnection) new URL(requestUrl).openConnection();//加入数据conn.setRequestMethod(requestMethod);conn.setDoOutput(true);BufferedOutputStream buffOutStr = new BufferedOutputStream(conn.getOutputStream());buffOutStr.write(output.getBytes("utf-8"));buffOutStr.flush();buffOutStr.close();//获取输入流BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));String line = null;StringBuffer sb = new StringBuffer();while((line = reader.readLine())!= null){sb.append(line);}return sb;}}

public class MobiMessage {public static Map<String,String> xml2map(HttpServletRequest request) throws IOException, DocumentException {Map<String,String> map = new HashMap<String, String>();SAXReader reader = new SAXReader();InputStream inputStream = request.getInputStream();Document document = reader.read(inputStream);Element root = document.getRootElement();List<Element> list = root.elements();for(Element e:list){map.put(e.getName(), e.getText());}inputStream.close();return map;}//订单转换成xmlpublic static String JsApiReqData2xml(JsApiReqData jsApiReqData){/*XStream xStream = new XStream();xStream.alias("xml",productInfo.getClass());return xStream.toXML(productInfo);*/MobiMessage.xstream.alias("xml",jsApiReqData.getClass());return MobiMessage.xstream.toXML(jsApiReqData);}public static String RefundReqData2xml(RefundReqData refundReqData){/*XStream xStream = new XStream();xStream.alias("xml",productInfo.getClass());return xStream.toXML(productInfo);*/MobiMessage.xstream.alias("xml",refundReqData.getClass());return MobiMessage.xstream.toXML(refundReqData);}public static String class2xml(Object object){return "";}public static Map<String, String> parseXml(String xml) throws Exception {Map<String, String> map = new HashMap<String, String>();Document document = DocumentHelper.parseText(xml);Element root = document.getRootElement();List<Element> elementList = root.elements();for (Element e : elementList)map.put(e.getName(), e.getText());return map;}//扩展xstream，使其支持CDATA块private static XStream xstream = new XStream(new XppDriver() {public HierarchicalStreamWriter createWriter(Writer out) {return new PrettyPrintWriter(out) {// 对所有xml节点的转换都增加CDATA标记boolean cdata = true;//@SuppressWarnings("unchecked")public void startNode(String name, Class clazz) {super.startNode(name, clazz);}protected void writeText(QuickWriter writer, String text) {if (cdata) {writer.write("<![CDATA[");writer.write(text);writer.write("]]>");} else {writer.write(text);}}};}});}

public class DateUtils {public static int minTimestamp = 0; //最小的时间戳public static int maxTimestamp = 1999999999;//最大的时间戳public static int offset = 0;/*** 按照yyyy-MM-dd HH:mm:ss的格式，日期转字符串** @param date* @return yyyy-MM-dd HH:mm:ss*/public static String date2Str(Date date) {return date2Str(date, "yyyy-MM-dd HH:mm:ss");}/*** 按照参数format的格式，日期转字符串** @param date* @param format* @return*/public static String date2Str(Date date, String format) {if (date != null) {SimpleDateFormat sdf = new SimpleDateFormat(format);return sdf.format(date);} else {return "";}}public static int getCurrentTimestamp() {return (int) (System.currentTimeMillis() / 1000 + offset);}public static boolean setCurrentTimestamp(int timestamp) {int systemTimestamp = (int) (System.currentTimeMillis() / 1000);offset = timestamp - systemTimestamp;return true;}
}