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java实现微信支付之扫码支付
本文直接从代码调用微信扫码支付讲起。账号配置，参数生成等请参考官方文档：https://pay.weixin.qq.com/wiki/doc/api/native.php?chapter=6_1
微信扫码支付。简单来说，就是你把微信支付需要的信息，生成到二维码图片中。通过微信扫一扫，发起支付。我们需要做的就是二件事：
一是：按照微信扫码支付规则生成二维码信息.
二是：微信没有提供生成二维码图片的接口。需要我们自己把二维码信息生成到二维码图片中。
1.模式选择：
微信扫码支付，有两种模式，文档中有介绍。第二种模式，微信接口会返回二维码信息给我们。而第一种模式则需要我们自己去生成二维码信息。会有些麻烦。尤其 是参数大小写，还有签名的问题，容易出错。总的来说第二种模式比第一种模式简单。所有我采用的是第二种模式，比较通用。京东与携程亦用的是第二种模式。
2.调用统一下单接口获取带有二维码信息的url：（模式二）
模式二的微信扫码支付，需要先调用微信的统一下单接口，生成预交易单。（参数传递与接收都是XML 数据格式。）
正确调用后，会返回含有交易标示ID，和二维码链接的URL。
3.实现扫码支付（模式二）
private static String APPID = "";
private static String MCHID= "";
private static String KEY= "";
private static String APPSECRET= "";
private static String body= "";
private static String notify_url= ""; //回调地址。测试回调必须保证外网能访问到此地址
/** * 统一下单接口 * 微信二维码支付 * @param params * @return */ public String weixin_pay(String out_trade_no,String product_id) { JSONObject retJson = new JSONObject(); try { String currTime = PayCommonUtil.getCurrTime(); String strTime = currTime.substring(8, currTime.length()); String strRandom = PayCommonUtil.buildRandom(4) + ""; String nonce_str = strTime + strRandom; //生成随机字符串 JSONObject requestObj = JSONObject.fromObject(params); // 正式上线的时候价格根据订单id查询 String order_price = "1"; // 价格 注意：价格的单位是分 SortedMap<Object, Object> packageParams = new TreeMap<Object, Object>(); packageParams.put("appid", APPID); packageParams.put("mch_id", MCHID); packageParams.put("nonce_str", nonce_str); packageParams.put("body", body); packageParams.put("out_trade_no", out_trade_no); packageParams.put("total_fee", order_price); packageParams.put("spbill_create_ip", "用户端ip"); packageParams.put("notify_url", notify_url); packageParams.put("trade_type", "NATIVE"); packageParams.put("product_id", product_id); Calendar nowTime = Calendar.getInstance(); packageParams.put("time_start", DateFormatUtil.formatDate( nowTime.getTime(), "yyyyMMddHHmmss")); nowTime.add(Calendar.MINUTE, requestObj.getInt("expire_time")); packageParams.put("time_expire", DateFormatUtil.formatDate( nowTime.getTime(), "yyyyMMddHHmmss")); String sign = PayCommonUtil.createSign("UTF-8", packageParams, KEY); packageParams.put("sign", sign); //加密 String requestXML = PayCommonUtil.getRequestXml(packageParams); logger.info("支付请求：" + requestXML); long startTime=System.currentTimeMillis(); String resXml = HttpRequest.postData( "https://api.mch.weixin.qq.com/pay/unifiedorder", requestXML); long endTime=System.currentTimeMillis(); Integer execute_time = (int) ((endTime-startTime)/1000); logger.info("支付结果：" + resXml); Map map = XMLUtil.doXMLParse(resXml); JSONObject reportParams = new JSONObject(); reportParams.put("url", "https://api.mch.weixin.qq.com/pay/unifiedorder"); reportParams.put("execute_time", execute_time); reportParams.put("return_code", map.get("return_code").toString()); reportParams.put("return_msg", map.get("return_msg").toString()); reportParams.put("result_code", map.get("result_code").toString()); if (map.get("err_code") != null) { reportParams.put("err_code", map.get("err_code").toString()); reportParams.put("err_code_des", map.get("err_code_des").toString()); } reportParams.put("out_trade_no", out_trade_no); //交易保障 report(reportParams.toString()); if (map.get("return_code").toString().equals("SUCCESS") && map.get("result_code").toString().equals("SUCCESS")) { String urlCode = (String) map.get("code_url"); //微信二维码短链接 retJson.put("code", 0); retJson.put("message", "下单成功."); retJson.put("data", urlCode); } else { retJson.put("code", 1); retJson.put("message", map.get("err_code_des").toString()); retJson.put("data", ""); } return retJson.toString(); } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } }
4.支付工具类
public class PayCommonUtil { public static Logger log = LoggerFactory.getLogger(PayCommonUtil.class); /** * 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 * @date 2016-4-22 * @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 = (String) entry.getKey(); String v = ""; try { v = (String) entry.getValue(); } catch (Exception e) { // TODO: handle exception v = entry.getValue() + ""; } 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 * @date 2016-4-22 * @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 = (String) entry.getKey(); String v = ""; try { v = (String) entry.getValue(); } catch (Exception e) { // TODO: handle exception v = entry.getValue() + ""; } 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; } public static JSONObject httpsRequestToJsonObject(String requestUrl, String requestMethod, String outputStr) { JSONObject jsonObject = null; try { StringBuffer buffer = httpsRequest(requestUrl, requestMethod, outputStr); jsonObject = JSONObject.fromObject(buffer.toString()); } catch (ConnectException ce) { log.error("连接超时：" + ce.getMessage()); } catch (Exception e) { log.error("https请求异常：" + e.getMessage()); } return jsonObject; } private static StringBuffer httpsRequest(String requestUrl, String requestMethod, String output) throws NoSuchAlgorithmException, NoSuchProviderException, KeyManagementException, MalformedURLException, IOException, ProtocolException, UnsupportedEncodingException { URL url = new URL(requestUrl); HttpsURLConnection connection = (HttpsURLConnection) url .openConnection(); connection.setDoOutput(true); connection.setDoInput(true); connection.setUseCaches(false); connection.setRequestMethod(requestMethod); if (null != output) { OutputStream outputStream = connection.getOutputStream(); outputStream.write(output.getBytes("UTF-8")); outputStream.close(); } // 从输入流读取返回内容 InputStream inputStream = connection.getInputStream(); InputStreamReader inputStreamReader = new InputStreamReader( inputStream, "utf-8"); BufferedReader bufferedReader = new BufferedReader(inputStreamReader); String str = null; StringBuffer buffer = new StringBuffer(); while ((str = bufferedReader.readLine()) != null) { buffer.append(str); } bufferedReader.close(); inputStreamReader.close(); inputStream.close(); inputStream = null; connection.disconnect(); return buffer; }}
java实现微信支付之扫码支付
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