java实现微信支付

java实现微信支付 

package com.hk.wx.pay.service.impl;



@Service
public class PayServiceImpl
  implements PayService
{
  private static final Logger LOG = LoggerFactory.getLogger(PayServiceImpl.class);
  private static final String PAY_URL = "https://api.mch.weixin.qq.com/pay/unifiedorder";

  @Value("${appid}")
  private String APPID = "";

  @Value("${pay.mch_id}")
  private String PAY_MACH_ID = "";

  @Value("${pay.body}")
  private String PAY_BODY = "";

  @Value("${pay.notify_url}")
  private String PAY_NOTIFY_URL = "";

  @Value("${pay.trade_type}")
  private String PAY_TYPR = "";

  @Value("${pay.key}")
  private String PAY_KEY = "";

  public JSONObject wxPay(String total_fee, String imei, String ip, String openid)
  {
    Map pay = new LinkedHashMap();   // 按照 添加顺序 排序

    pay.put("appid", this.APPID); //小程序 aapid
    pay.put("attach", getOrderNum());　　//附加数据
    pay.put("body", this.PAY_BODY);　　　　//商品描述
    pay.put("device_info", imei);　　　　　　//
    pay.put("mch_id", this.PAY_MACH_ID);　　//商品号
    pay.put("nonce_str", getNonceStr());　　//随机字符串
    pay.put("notify_url", this.PAY_NOTIFY_URL); //返回连接
    pay.put("openid", openid);　　　　　　　　　　 //微信用户 id
    pay.put("out_trade_no", getOrderNum());    //订单号
    pay.put("sign_type", "MD5");
    pay.put("spbill_create_ip", ip);
    pay.put("total_fee", total_fee);
    pay.put("trade_type", this.PAY_TYPR);
    pay.put("sign", getSign(pay));

    String xml = XmlUtil.mapToXMLString(pay);  // 转成 xml 形式
    System.out.println(xml);
    String msg = "";
    try
    {
      msg = HttpUtils.xmlRequest("https://api.mch.weixin.qq.com/pay/unifiedorder", "POST", xml); // xml 形式 post请求
      JSONObject json = XmlUtil.xmlToJSONObject(msg);
      String ret = json.getString("return_code");

      if ((ret != "") && (ret.equals("SUCCESS")) && 
        (!"SUCCESS".equals(json.getString("result_code")))) {
        return json;
      }

      LOG.info("# 统一下单错误...msg:" + json.toString());

      return null;
    }
    catch (Exception e) {
      LOG.error("# 支付出错...");
      e.printStackTrace();
    }return null;
  }
　　
　　
 
　　//获取随机数
  private static String getNonceStr()
  {
    return Md5Utils.encryption(ComApi.getUUID());
  }

  //获取 sign
  private static String getSign(Map<Object, Object> parameters)
  {
    String characterEncoding = "UTF-8";
    StringBuffer sb = new StringBuffer();

    List list = new ArrayList(parameters.entrySet());

    Collections.sort(list, new Comparator() {
      public int compare(Map.Entry<Object, Object> mapping1, Map.Entry<Object, Object> mapping2) {
        return ((String)mapping1.getKey()).compareTo((String)mapping2.getKey());
      }
    });
    for (Map.Entry mapping : list) {
      String k = (String)mapping.getKey();
      Object v = mapping.getValue();
      if ((v != null) && (!"".equals(v)) && (!"sign".equals(k)) && (!"key".equals(k))) {
        sb.append(k + "=" + v + "&");
      }

    }

    sb.append("key=key");  //key 是支付帐号里面的api安全密码
    LOG.info("# sign 拼接：" + sb.toString());
    String sign = Md5Utils.encryption(sb.toString(), characterEncoding).toUpperCase();
    LOG.info("# 获取 签名...sign：" + sign);
    return sign;
  }

　 //获取订货号
  private static String getOrderNum()
  {
    String time = TimeUtils.getSysDate("yyyyMMddHHmmssSSS");
    String uuNum = ComApi.getUUNum();
    String num = "HK" + time + uuNum;
    return num;
  }


}