微信官方文档与例子，我使用不了，查找相关文档无数，找了几个靠谱的
https://blog.csdn.net/qq_32574435/article/details/78952325
https://blog.csdn.net/rentian1/article/details/78807199
http://kf.qq.com/faq/170830jimmaa170830B7F7NJ.html
（恩，点赞）
选择模式二开发，好用又快
上来你应该有个配置文件WXpayConfig
商户id，公证号，被扫api地址：就是官方给的统一下单的网址：public static String PAY_QUERY_API = "https://api.mch.weixin.qq.com/pay/orderquery";
我只写被扫，还有回调函数，就是客户扫码支付成功了，会调用后台的地址，一个二维码包含了很多机制与信息
controller
@RequestMapping(value="/qrcodePay",produces="application/json;charset=UTF-8")
public String qrcodePay(ForWXPay record,HttpServletRequest req,HttpServletResponse response){
JSONObject json = new JSONObject();
record.setTrade_type("NATIVE");
record.setSpbill_create_ip(WXPayUtil.getIpAddr(req));
Map<String, String> map = wXPayService.unifiedorder(record);
if(map.get("return_code").equals("SUCCESS")){
if(map.get("result_code").equals("SUCCESS")){
String url = map.get("code_url");
System.out.println(url);
json.put("data", url);
json.put("code", 1);
}else{
json.put("code", 0);
System.out.println(map.get("err_code_des"));
}
}else{
json.put("code", 0);
System.out.println(map.get("return_msg"));
}
return json.toJSONString();
}
serviceimpl实现类：
@Override
public Map<String, String> unifiedorder(ForWXPay record) {
String key = WXPayConfig.key;
String currTime = WXPayUtil.getCurrTime();
String strTime = currTime.substring(8, currTime.length());
String strRandom = WXPayUtil.buildRandom(4) + "";
String nonce_str = strTime + strRandom;
//TbOrderForm orderForm = tbOrderFormMapper.selectByOrderNum(record.getOut_trade_no());
//String total_fee = orderForm.getOrderAmount().multiply(new BigDecimal("100")).intValue() + "";
String trade_type = record.getTrade_type();
String time_start = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date());
Calendar ca = Calendar.getInstance();
ca.setTime(new Date());
ca.add(Calendar.MINUTE, 10);
String time_expire = new SimpleDateFormat("yyyyMMddHHmmss").format(ca.getTime());
SortedMap<Object,Object> packageParams = new TreeMap<Object,Object>();
packageParams.put("appid", WXPayConfig.appID);
packageParams.put("mch_id", WXPayConfig.mchID);
packageParams.put("nonce_str", nonce_str);
packageParams.put("body", "aa");
packageParams.put("out_trade_no", record.getOut_trade_no());
packageParams.put("total_fee", "100");
packageParams.put("spbill_create_ip", record.getSpbill_create_ip());
packageParams.put("notify_url",WXPayConfig.NOTIFY_URL );
packageParams.put("trade_type", trade_type);
packageParams.put("time_start", time_start);
packageParams.put("time_expire", time_expire);
if(!StringUtils.isEmpty(record.getOpenid())){
packageParams.put("openid", record.getOpenid());
}
String sign = WXPayUtil.createSign("UTF-8", packageParams,key);
packageParams.put("sign", sign);
String requestXML = WXPayUtil.getRequestXml(packageParams);
System.out.println("请求xml：：：："+requestXML);
String resXml = WXPayUtil.postData(WXPayConfig.PAY_API, requestXML);
System.out.println("返回xml：：：："+resXml);
Map<String, String> map = null;
try {
map = WXPayUtil.doXMLParse(resXml);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return map;
}
他需要的工具包，自己去找，请求与返回的都是xml的，解析之后拿到code_url,返回到前台，其实是一个网址，前台
js这么整：$("#img").attr("src","qrcode?code_url="+result.data);二维码出来了，支付调回调函数，这个我会在支付宝的通知里面一块写
/**
* 生成二维码图片 不存储 直接以流的形式输出到页面
* @param content
* @param response
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
public static void encodeQrcode(String content,HttpServletResponse response){
if(content==null || "".equals(content))
return;
MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
Map hints = new HashMap();
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8"); //设置字符集编码类型
BitMatrix bitMatrix = null;
try {
bitMatrix = multiFormatWriter.encode(content, BarcodeFormat.QR_CODE, 300, 300,hints);
BufferedImage image = toBufferedImage(bitMatrix);
//输出二维码图片流
try {
ImageIO.write(image, "png", response.getOutputStream());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (WriterException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}