Java开发SSM框架微信支付的实现

public class Configure {
  //商户支付密钥
  private static String key = "****************************";
  //小程序ID
  private static String appID = "***************";
  //商户号
  private static String mch_id = "*********";
  //小程序密钥
  private static String secret = "********************";

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    String code = request.getParameter("code");
    HttpGet httpGet = new HttpGet("https://api.weixin.qq.com/sns/jscode2session?appid="+Configure.getAppID()+"&secret="+Configure.getSecret()+"&js_code="+code+"&grant_type=authorization_code");
        //设置请求器的配置
    HttpClient httpClient = HttpClients.createDefault();
    HttpResponse res = httpClient.execute(httpGet);
    HttpEntity entity = res.getEntity();
    String result = EntityUtils.toString(entity, "UTF-8");
    response.getWriter().append(result);
  }

      String openid = request.getParameter("openid");
      int totalFee=Integer.parseInt(request.getParameter("totalFee"));//获取支付金额
      String out_trade_no=RandomStringGenerator.getRandomStringByLength(32);//商户订单号
      OrderInfo order = new OrderInfo();
      order.setAppid(Configure.getAppID());
      order.setMch_id(Configure.getMch_id());
      order.setNonce_str(RandomStringGenerator.getRandomStringByLength(32));
      order.setBody("测试");
      order.setOut_trade_no(out_trade_no);
      order.setTotal_fee(totalFee);
      order.setSpbill_create_ip("***.***.***.**");
      order.setNotify_url("https://www.see-source.com/weixinpay/PayResult");
      order.setTrade_type("JSAPI");
      order.setOpenid(openid);
      order.setSign_type("MD5");

try {
      String repay_id = request.getParameter("repay_id");
      SignInfo signInfo = new SignInfo();
      signInfo.setAppId(Configure.getAppID());
      long time = System.currentTimeMillis()/1000;
      signInfo.setTimeStamp(String.valueOf(time));
      signInfo.setNonceStr(RandomStringGenerator.getRandomStringByLength(32));
      signInfo.setRepay_id("prepay_id="+repay_id);
      signInfo.setSignType("MD5");
      //生成签名
      String sign = Signature.getSign(signInfo);

      JSONObject json = new JSONObject();
      json.put("timeStamp", signInfo.getTimeStamp());
      json.put("nonceStr", signInfo.getNonceStr());
      json.put("package", signInfo.getRepay_id());
      json.put("signType", signInfo.getSignType());
      json.put("paySign", sign);
      L.info("-------再签名:"+json.toJSONString());
      response.getWriter().append(json.toJSONString());
    } catch (Exception e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
      L.error("-------", e);
    }

public static String getSign(Object o) throws IllegalAccessException {
    ArrayList<String> list = new ArrayList<String>();
    @SuppressWarnings("rawtypes")
    Class cls = o.getClass();
    Field[] fields = cls.getDeclaredFields();
    for (Field f : fields) {
      f.setAccessible(true);
      if (f.get(o) != null && f.get(o) != "") {
        String name = f.getName();
        XStreamAlias anno = f.getAnnotation(XStreamAlias.class);
        if(anno != null)
          name = anno.value();
        list.add(name + "=" + f.get(o) + "&");
      }
    }
    int size = list.size();
    String [] arrayToSort = list.toArray(new String[size]);
    Arrays.sort(arrayToSort, String.CASE_INSENSITIVE_ORDER);
    StringBuilder sb = new StringBuilder();
    for(int i = 0; i < size; i ++) {
      sb.append(arrayToSort[i]);
    }
    String result = sb.toString();
    result += "key=" + Configure.getKey();
    System.out.println("签名数据："+result);
    result = MD5Util.MD5Encode(result,"utf-8").toUpperCase();
    return result;
  }