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记录一下微信小程序支付

简介：微信小程序支付这里的坑还是有的，所以提醒各位在编写的一定要注意！！！
1.首先呢，你需要准备openid，appid，还有申请微信支付后要设置一个32位的密钥，需要先生成一个sign，得到prepay_id，然后再得到一个paySign，总之就是很墨迹，下面献上我的controller

    //微信下单支付@ResponseBody@RequestMapping("doOrder")public void doOrder(HttpServletRequest request, HttpServletResponse response) throws IOException, JDOMException {request.setCharacterEncoding("UTF-8");response.setCharacterEncoding("UTF-8");//得到openidString openid = request.getParameter("openid");int fee = 0;//得到小程序传过来的价格，注意这里的价格必须为整数，1代表1分，所以传过来的值必须*100；if (null != request.getParameter("price")) {fee = Integer.parseInt(request.getParameter("price").toString());}System.out.println(request.getParameter("price"));System.out.println(fee);//订单编号String did = request.getParameter("did");//订单标题String title = request.getParameter("title");//时间戳String times = System.currentTimeMillis() + "";SortedMap<Object, Object> packageParams = new TreeMap<Object, Object>();packageParams.put("appid", "wxa**********2e2");packageParams.put("mch_id", "1486425722");packageParams.put("nonce_str", times);//时间戳packageParams.put("body", title);//支付主体packageParams.put("out_trade_no", did);//编号packageParams.put("total_fee", fee);//价格// packageParams.put("spbill_create_ip", getIp2(request));这里之前加了ip，但是总是获取sign失败，原因不明，之后就注释掉了packageParams.put("notify_url", base+"/notify");//支付返回地址，不用纠结这个东西，我就是随便写了一个接口，内容什么都没有packageParams.put("trade_type", "JSAPI");//这个api有，固定的packageParams.put("openid", openid);//openid//获取signString sign = PayCommonUtil.createSign("UTF-8", packageParams, "x********************************4");//最后这个是自己设置的32位密钥packageParams.put("sign", sign);//转成XMLString requestXML = PayCommonUtil.getRequestXml(packageParams);System.out.println(requestXML);//得到含有prepay_id的XMLString resXml = HttpUtil.postData("https://api.mch.weixin.qq.com/pay/unifiedorder", requestXML);System.out.println(resXml);//解析XML存入MapMap map = XMLUtil.doXMLParse(resXml);System.out.println(map);// String return_code = (String) map.get("return_code");//得到prepay_idString prepay_id = (String) map.get("prepay_id");SortedMap<Object, Object> packageP = new TreeMap<Object, Object>();packageP.put("appId", "wxa**********2e2");//！！！注意，这里是appId,上面是appid，真怀疑写这个东西的人。。。packageP.put("nonceStr", times);//时间戳packageP.put("package", "prepay_id=" + prepay_id);//必须把package写成 "prepay_id="+prepay_id这种形式packageP.put("signType", "MD5");//paySign加密packageP.put("timeStamp", (System.currentTimeMillis() / 1000) + "");//得到paySignString paySign = PayCommonUtil.createSign("UTF-8", packageP, "x********************************4");packageP.put("paySign", paySign);//将packageP数据返回给小程序Gson gson = new Gson();String json = gson.toJson(packageP);PrintWriter pw = response.getWriter();System.out.println(json);pw.write(json);pw.close();}

2.下面是需要用到的工具类
（1）.生成sign以及得到sign后生成XML工具类PayCommonUtil

public class PayCommonUtil {/** * 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 = MD5.MD5Encode(sb.toString(), characterEncoding).toLowerCase();  String tenpaySign = ((String)packageParams.get("sign")).toLowerCase();  //System.out.println(tenpaySign + "    " + mysign);  return tenpaySign.equals(mysign);  }  /** * @author * @Description：sign签名 * @param characterEncoding *            编码格式 * @param parameters *            请求参数 * @return */  public static String createSign(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 = entry.getKey().toString();  String v = entry.getValue().toString();  if (null != v && !"".equals(v) && !"sign".equals(k) && !"key".equals(k)) {  sb.append(k + "=" + v + "&");  }  }  sb.append("key=" + API_KEY);  String sign = MD5.MD5Encode(sb.toString(), characterEncoding).toUpperCase();  return sign;  }  /** * @author * @Description：将请求参数转换为xml格式的string * @param parameters *            请求参数 * @return */  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 = entry.getKey().toString();  String v = entry.getValue().toString();   if ("attach".equalsIgnoreCase(k) || "body".equalsIgnoreCase(k) || "sign".equalsIgnoreCase(k)) {  sb.append("<" + k + ">" + "<![CDATA[" + v + "]]></" + k + ">");  } else {  sb.append("<" + k + ">" + v + "</" + k + ">");  }  }  sb.append("</xml>");  return sb.toString();  }  /** * 取出一个指定长度大小的随机正整数. *  * @param length *            int 设定所取出随机数的长度。length小于11 * @return int 返回生成的随机数。 */  public static int buildRandom(int length) {  int num = 1;  double random = Math.random();  if (random < 0.1) {  random = random + 0.1;  }  for (int i = 0; i < length; i++) {  num = num * 10;  }  return (int) ((random * num));  }  /** * 获取当前时间 yyyyMMddHHmmss *  * @return String */  public static String getCurrTime() {  Date now = new Date();  SimpleDateFormat outFormat = new SimpleDateFormat("yyyyMMddHHmmss");  String s = outFormat.format(now);  return s;  }  
}

（2）.访问官方接口得到含有prepay_id的XML工具类HttpUtil

    public class HttpUtil {//private static final Log logger = Logs.get();  private final static int CONNECT_TIMEOUT = 5000; // in milliseconds  private final static String DEFAULT_ENCODING = "UTF-8";  public static String postData(String urlStr, String data){  return postData(urlStr, data, null);  }  public static String postData(String urlStr, String data, String contentType){  BufferedReader reader = null;  try {  URL url = new URL(urlStr);  URLConnection conn = url.openConnection();  conn.setDoOutput(true);  conn.setConnectTimeout(CONNECT_TIMEOUT);  conn.setReadTimeout(CONNECT_TIMEOUT);  if(contentType != null)  conn.setRequestProperty("content-type", contentType);  OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream(), DEFAULT_ENCODING);  if(data == null)  data = "";  writer.write(data);   writer.flush();  writer.close();    reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), DEFAULT_ENCODING));  StringBuilder sb = new StringBuilder();  String line = null;  while ((line = reader.readLine()) != null) {  sb.append(line);  sb.append("\r\n");  }  return sb.toString();  } catch (IOException e) {  //logger.error("Error connecting to " + urlStr + ": " + e.getMessage());  } finally {  try {  if (reader != null)  reader.close();  } catch (IOException e) {  }  }  return null;  }  

}

（3）.解析XML工具类

public class XMLUtil {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;  }  /** * 获取子结点的xml * @param children * @return String */  public static String getChildrenText(List children) {  StringBuffer sb = new StringBuffer();  if(!children.isEmpty()) {  Iterator it = children.iterator();  while(it.hasNext()) {  Element e = (Element) it.next();  String name = e.getName();  String value = e.getTextNormalize();  List list = e.getChildren();  sb.append("<" + name + ">");  if(!list.isEmpty()) {  sb.append(XMLUtil.getChildrenText(list));  }  sb.append(value);  sb.append("</" + name + ">");  }  }  return sb.toString();  }  
}

（4）.MD5加密工具类

public class MD5 {private static String byteArrayToHexString(byte b[]) {StringBuffer resultSb = new StringBuffer();for (int i = 0; i < b.length; i++)resultSb.append(byteToHexString(b[i]));return resultSb.toString();}private static String byteToHexString(byte b) {int n = b;if (n < 0)n += 256;int d1 = n / 16;int d2 = n % 16;return hexDigits[d1] + hexDigits[d2];}public static String MD5Encode(String origin, String charsetname) {String resultString = null;try {resultString = new String(origin);MessageDigest md = MessageDigest.getInstance("MD5");if (charsetname == null || "".equals(charsetname))resultString = byteArrayToHexString(md.digest(resultString.getBytes()));elseresultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetname)));} catch (Exception exception) {}return resultString;}private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5","6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };}

3.小程序支付向后台传输的参数

  gopay: function () {
var that = this
wx.request({url: app.baseurl + 'doOrder',data: {'openid': wx.getStorageSync('openids'),'title': that.data.title,'did': that.data.did,'price': that.data.price*100},method: 'POST',header: {"content-type": 'application/x-www-form-urlencoded'},success: function (res) {console.log(res.data)console.log(res.data.timeStamp)console.log(res.data.nonceStr)console.log(res.data.package)console.log(res.data.paySign)wx.requestPayment({timeStamp: res.data.timeStamp,nonceStr: res.data.nonceStr,package: res.data.package,signType: res.data.signType,paySign: res.data.paySign,success: function (res) {wx.request({url: app.baseurl+'updateState',data: {'did': that.data.did,},method: 'GET',success:function(res){console.log(res.data)if(res.data==1){wx.redirectTo({url: '../orderDetial/orderDetial?did=' + that.data.did,})}}})},fail: function (res) {console.log(res)}})}
})}

结束啦，小程序支付的java后台就这些。