用户扫描商户展示在各种场景的二维码进行支付。
微信提供两种扫码支付模式,模式一是先生成一个微信规定格式的二维码供用户扫描,引导完成支付,需要在服务号上配置回调地址。模式二通过后台向微信提交支付申请,微信提供一个连接,将连接生成二维码后供用户扫描完成支付。
官方解释:
【模式一】:商户后台系统根据微信支付规则链接生成二维码,链接中带固定参数productid(可定义为产品标识或订单号)。用户扫码后,微信支付系统将productid和用户唯一标识(openid)回调商户后台系统(需要设置支付回调URL),商户后台系统根据productid生成支付交易,最后微信支付系统发起用户支付流程。
【模式二】:商户后台系统调用微信支付【统一下单API】生成预付交易,将接口返回的链接生成二维码,用户扫码后输入密码完成支付交易。注意:该模式的预付单有效期为2小时,过期后无法支付。
本文采用模式二。(官方文档:https://pay.weixin.qq.com/wiki/doc/api/native.php?chapter=6_5)
业务流程说明:
(1)商户后台系统根据用户选购的商品生成订单。
(2)用户确认支付后调用微信支付【统一下单API】生成预支付交易;
(3)微信支付系统收到请求后生成预支付交易单,并返回交易会话的二维码链接code_url。
(4)商户后台系统根据返回的code_url生成二维码。
(5)用户打开微信“扫一扫”扫描二维码,微信客户端将扫码内容发送到微信支付系统。
(6)微信支付系统收到客户端请求,验证链接有效性后发起用户支付,要求用户授权。
(7)用户在微信客户端输入密码,确认支付后,微信客户端提交授权。
(8)微信支付系统根据用户授权完成支付交易。
(9)微信支付系统完成支付交易后给微信客户端返回交易结果,并将交易结果通过短信、微信消息提示用户。微信客户端展示支付交易结果页面。
(10)微信支付系统通过发送异步消息通知商户后台系统支付结果。商户后台系统需回复接收情况,通知微信后台系统不再发送该单的支付通知。
(11)未收到支付通知的情况,商户后台系统调用【查询订单API】。
(12)商户确认订单已支付后给用户发货。
具体代码:
action中代码:
/**
* 微信支付的action
* @author
* @since 20180504
*/
@Namespace("/QRpay")
public class WeChatPayAction extends BasicAction<DoctorAccount>{
private static final long serialVersionUID = 1L;
// 微信的参数
private WeixinConfigUtils config = new WeixinConfigUtils();
@Resource
private IBasicsConfigService basicsConfigService;
private Unifiedorder unifiedorder = new Unifiedorder();
@Action("generateOrder")
public String generateOrder(){
String candy = Struts2Utils.getRequest().getParameter("candy");
if (StringUtils.isNotBlank(candy)) {
Integer score = Integer .valueOf(candy);
String url = null;
String out_trade_no = UuIdUtils.getUUID();
//从redis中获取固定的连接地址
String domainName = basicsConfigService.getBasicsConfig();
// 参数组
String appid = config.appid_doctor;
String mch_id = config.mch_id_doctor;
String nonce_str = RandCharsUtils.getRandomString(16);
String body = "";
body = "医师购买" + score + "康币,支付" + score + "元";
String spbill_create_ip = "127.0.0.1";
int total_fee = score;// 单位是分,现在按照ios传递过来的参数进行
String notify_url = domainName+"/weixinPay/notifyDoctorUrl.do";
String trade_type = "NATIVE";
unifiedorder = WXSignUtils.getQRUnifiedorder(appid, mch_id, body, nonce_str, out_trade_no, total_fee, notify_url, trade_type, spbill_create_ip, "2");
try {
Map<String, String> map = HttpXmlUtils.getQRMap(unifiedorder);
for (String value : map.keySet()) {
if (map.get("return_code").equals("SUCCESS")) {
url = map.get("code_url");
}
System.out.println(value + map.get(value));
}
} catch (Exception e) {
// TODO: handle exception
}
}
return null;
}
}
WeixinConfigUtils:
/**
* 微信的配置参数
* @author
* @date 2017/08/10
*/
@SuppressWarnings("unused")
public class WeixinConfigUtils {
private static final Log log = LogFactory.getLog(WeixinConfigUtils.class);
public static String appid;
public static String mch_id;
public static String mch_id_doctor;
public static String appid_doctor;
static {
try{
InputStream is = WeixinConfigUtils.class.getResourceAsStream("/weixin.properties");
Properties properties = new Properties();
properties.load(is);
appid = properties.getProperty("weixin.appid");
mch_id = properties.getProperty("weixin.mch_id");
appid_doctor=properties.getProperty("weixin.doctor.appid");
mch_id_doctor = properties.getProperty("weixin.doctor.mch_id");
}catch(Exception ex){
log.debug("加载配置文件:"+ex.getMessage());
}
}
}
Unifiedorder用于封装微信相关的请求字段:包括退款,扫码支付、app支付、h5支付、转账到个人
/**
* 统一下单提交为微信的参数
* @author
* @date 2017年08月11日
*/
public class Unifiedorder implements Serializable{
private static final long serialVersionUID = 1L;
//微信支付表id
private Integer weixinId;
//微信分配的公众账号ID(企业号corpid即为此appId)
private String appid;
//商户id
private String mch_id;
//终端设备号(门店号或收银设备ID),注意:PC网页或公众号内支付请传"WEB"
private String device_info;
//随机字符串:数字+大写字母的组合,32位
private String nonce_str;
//签名
private String sign;
//商品或支付单简要描述
private String body;
//商品名称明细列表
private String detail;
//附加参数(例如:用于区别本商户不同的分店)
private String attach;
//商户系统内部的订单号
private String out_trade_no;
//货币类型:符合ISO 4217标准的三位字母代码,默认人民币:CNY
private String fee_type;
//总金额
private int total_fee;
//APP和网页支付提交[用户端ip],Native支付填调用微信支付API的机器IP。
private String spbill_create_ip;
//订单生成时间,格式为yyyyMMddHHmmss,
private String time_start;
//订单失效时间,格式为yyyyMMddHHmmss,最短失效时间间隔必须大于5分钟[支付宝是30分钟,同样30分钟]
private String time_expire;
//商品标记,代金券或立减优惠功能的参数
private String goods_tag;
//接收微信支付异步通知回调地址
private String notify_url;
//交易类型:JSAPI,NATIVE,APP h5为 MWEB
private String trade_type;
//trade_type=NATIVE,此参数必传。此id为二维码中包含的商品ID,商户自行定义。
private String product_id;
//no_credit--指定不能使用信用卡支付
private String limit_pay;
//trade_type=JSAPI,此参数必传,用户在商户appid下的唯一标识
private String openid;
//商户内部自己的退款单号
private String out_refund_no;
//退款总金额单位为分
private int refund_fee;
//操作员的id默认为mch_id
private String op_user_id;
//微信官方提供的订单号
private String prepayid;
//记录所对应的member
private Member member;
//返回给微信的状态码(用于支付回调时)
public String return_code;
//微信h5支付时候的场景信息官方的信息模板 {"h5_info"://h5支付固定传"h5_info"
//{"type":"",//场景类型 "wap_url":"",//WAP网站URL地址"wap_name": ""//WAP 网站名}}
public String scene_info;
public String getScene_info() {
return scene_info;
}
public void setScene_info(String scene_info) {
this.scene_info = scene_info;
}
public String getReturn_code() {
return return_code;
}
public void setReturn_code(String return_code) {
this.return_code = return_code;
}
public String getAppid() {
return appid;
}
public String getMch_id() {
return mch_id;
}
public String getDevice_info() {
return device_info;
}
public String getNonce_str() {
return nonce_str;
}
public String getSign() {
return sign;
}
public String getBody() {
return body;
}
public String getDetail() {
return detail;
}
public String getAttach() {
return attach;
}
public String getOut_trade_no() {
return out_trade_no;
}
public String getFee_type() {
return fee_type;
}
public int getTotal_fee() {
return total_fee;
}
public String getSpbill_create_ip() {
return spbill_create_ip;
}
public String getTime_start() {
return time_start;
}
public String getTime_expire() {
return time_expire;
}
public String getGoods_tag() {
return goods_tag;
}
public String getNotify_url() {
return notify_url;
}
public String getTrade_type() {
return trade_type;
}
public String getProduct_id() {
return product_id;
}
public String getLimit_pay() {
return limit_pay;
}
public String getOpenid() {
return openid;
}
public void setAppid(String appid) {
this.appid = appid;
}
public void setMch_id(String mch_id) {
this.mch_id = mch_id;
}
public void setDevice_info(String device_info) {
this.device_info = device_info;
}
public void setNonce_str(String nonce_str) {
this.nonce_str = nonce_str;
}
public void setSign(String sign) {
this.sign = sign;
}
public void setBody(String body) {
this.body = body;
}
public void setDetail(String detail) {
this.detail = detail;
}
public void setAttach(String attach) {
this.attach = attach;
}
public void setOut_trade_no(String out_trade_no) {
this.out_trade_no = out_trade_no;
}
public void setFee_type(String fee_type) {
this.fee_type = fee_type;
}
public void setTotal_fee(int total_fee) {
this.total_fee = total_fee;
}
public void setSpbill_create_ip(String spbill_create_ip) {
this.spbill_create_ip = spbill_create_ip;
}
public void setTime_start(String time_start) {
this.time_start = time_start;
}
public void setTime_expire(String time_expire) {
this.time_expire = time_expire;
}
public void setGoods_tag(String goods_tag) {
this.goods_tag = goods_tag;
}
public void setNotify_url(String notify_url) {
this.notify_url = notify_url;
}
public void setTrade_type(String trade_type) {
this.trade_type = trade_type;
}
public void setProduct_id(String product_id) {
this.product_id = product_id;
}
public void setLimit_pay(String limit_pay) {
this.limit_pay = limit_pay;
}
public void setOpenid(String openid) {
this.openid = openid;
}
public String getOut_refund_no() {
return out_refund_no;
}
public void setOut_refund_no(String out_refund_no) {
this.out_refund_no = out_refund_no;
}
public int getRefund_fee() {
return refund_fee;
}
public void setRefund_fee(int refund_fee) {
this.refund_fee = refund_fee;
}
public Integer getWeixinId() {
return weixinId;
}
public void setWeixinId(Integer weixinId) {
this.weixinId = weixinId;
}
public Member getMember() {
return member;
}
public void setMember(Member member) {
this.member = member;
}
public String getPrepayid() {
return prepayid;
}
public void setPrepayid(String prepayid) {
this.prepayid = prepayid;
}
public String getOp_user_id() {
return op_user_id;
}
public void setOp_user_id(String op_user_id) {
this.op_user_id = op_user_id;
}
}
UuIdUtils代码:
public class UuIdUtils {
public static String getUUID() {
return UUID.randomUUID().toString().replace("-", "");
}
}
RandCharsUtils代码:
/**
* nonce_str随即字符串
* @author
* @date 2017/08/10
*/
public class RandCharsUtils {
private static SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
public static String getRandomString(int length) { //length表示生成字符串的长度
String base = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
Random random = new Random();
StringBuffer sb = new StringBuffer();
int number = 0;
for (int i = 0; i < length; i++) {
number = random.nextInt(base.length());
sb.append(base.charAt(number));
}
return sb.toString();
}
/*
* 订单开始交易的时间
*/
public static String timeStart(){
return df.format(new Date());
}
/*
* 订单开始交易的时间
*/
public static String timeExpire(){
Calendar now=Calendar.getInstance();
now.add(Calendar.MINUTE,30);
return df.format(now.getTimeInMillis());
}
}
WXSignUtils代码
/**
* 微信支付签名
* @author
* @date 2017/08/10
*/
public class WXSignUtils {
//微信统一签名的对象
private static Unifiedorder unifiedorder = new Unifiedorder();
//封装参数的方法
private static SortedMap<Object, Object> parameters = new TreeMap<Object, Object>();
/**
* 微信支付签名算法sign
* @param characterEncoding
* @param parameters
* @return
*/
@SuppressWarnings("rawtypes")
public static String createSign(String characterEncoding,SortedMap<Object,Object> parameters,String type){
StringBuffer sb = new StringBuffer();
Set es = parameters.entrySet();//所有参与传参的参数按照accsii排序(升序)
Iterator it = es.iterator();
while(it.hasNext()) {
Map.Entry entry = (Map.Entry)it.next();
String k = (String)entry.getKey();
Object v = entry.getValue();
if(null != v && !"".equals(v)
&& !"sign".equals(k) && !"key".equals(k)) {
sb.append(k + "=" + v + "&");
}
}
if (type.equals("1")) {
sb.append("key=" + weixinConstant.KEY);
}else if (type.equals("2")) {
sb.append("key=" + weixinConstant.DOC_KEY);
}
String sign = MD5Util.MD5Encode(sb.toString(), characterEncoding).toUpperCase();
return sign;
}
/**
* 微信扫码支付时返回封装好的参数
* @author yangfuren
* @param appid 应用id
* @param mch_id 商户号
* @param body 内容
* @param nonce_str 随机串
* @param out_trade_no 微信商户号
* @param total_fee 总价格
* @param notify_url 回调url
* @param trade_type 支付方式
* @param spbill_create_ip 请求接口id
* @param scence_info h5支付相关信息
* @param type 1用户 2 医师
* @return
*/
public static Unifiedorder getQRUnifiedorder(String appid,String mch_id,String body,String nonce_str,String out_trade_no,Integer total_fee,String notify_url,String trade_type,String spbill_create_ip,String type)
{
parameters.put("appid", appid);
parameters.put("mch_id", mch_id);
parameters.put("body", body);
parameters.put("nonce_str", nonce_str);
parameters.put("out_trade_no", out_trade_no);
parameters.put("total_fee", total_fee);
parameters.put("notify_url", notify_url);
parameters.put("trade_type", trade_type);
parameters.put("spbill_create_ip", spbill_create_ip);
String sign = createSign("UTF-8", parameters,type);
// 微信统一下单
unifiedorder.setAppid(appid);
unifiedorder.setMch_id(mch_id);
unifiedorder.setNonce_str(nonce_str);
unifiedorder.setSign(sign);
unifiedorder.setBody(body);
unifiedorder.setOut_trade_no(out_trade_no);
unifiedorder.setTotal_fee(total_fee);
unifiedorder.setSpbill_create_ip(spbill_create_ip);
unifiedorder.setNotify_url(notify_url);
unifiedorder.setTrade_type(trade_type);
return unifiedorder;
}
}
MD5:
public class MD5Util {
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()));
else
resultString = 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" };
}
请求参数并解析返回xml:
/**
* 构造xml参数
* @param xml
* @return
*/
public static String QRxmlInfo(Unifiedorder unifiedorder){
if(unifiedorder!=null){
StringBuffer bf = new StringBuffer();
bf.append("<xml>");
bf.append("<appid><![CDATA[");
bf.append(unifiedorder.getAppid());
bf.append("]]></appid>");
bf.append("<mch_id><![CDATA[");
bf.append(unifiedorder.getMch_id());
bf.append("]]></mch_id>");
bf.append("<nonce_str><![CDATA[");
bf.append(unifiedorder.getNonce_str());
bf.append("]]></nonce_str>");
bf.append("<sign><![CDATA[");
bf.append(unifiedorder.getSign());
bf.append("]]></sign>");
bf.append("<body><![CDATA[");
bf.append(unifiedorder.getBody());
bf.append("]]></body>");
bf.append("<out_trade_no><![CDATA[");
bf.append(unifiedorder.getOut_trade_no());
bf.append("]]></out_trade_no>");
bf.append("<total_fee><![CDATA[");
bf.append(unifiedorder.getTotal_fee());
bf.append("]]></total_fee>");
bf.append("<spbill_create_ip><![CDATA[");
bf.append(unifiedorder.getSpbill_create_ip());
bf.append("]]></spbill_create_ip>");
bf.append("<notify_url><![CDATA[");
bf.append(unifiedorder.getNotify_url());
bf.append("]]></notify_url>");
bf.append("<trade_type><![CDATA[");
bf.append(unifiedorder.getTrade_type());
bf.append("]]></trade_type>");
bf.append("</xml>");
return bf.toString();
}
return "";
}
/**
* post请求并得到返回结果
* @param requestUrl
* @param requestMethod
* @param output
* @return
*/
public static String httpsRequest(String requestUrl, String requestMethod, String output) {
try{
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.toString();
}catch(Exception ex){
ex.printStackTrace();
}
return "";
}
/**
* h5支付时 解析返回的值并返回prepareid
* @throws IOException
* @throws JDOMException
*/
public static Map<String, String> getQRMap(Unifiedorder unifiedorder) throws JDOMException, IOException{
String xmlInfo = QRxmlInfo(unifiedorder);
String wxUrl = weixinConstant.URL;
String method = "POST";
String weixinPost = HttpXmlUtils.httpsRequest(wxUrl, method, xmlInfo).toString();
ParseXMLUtils.jdomParseXml(weixinPost);
StringReader read = new StringReader(weixinPost);
// 创建新的输入源SAX 解析器将使用 InputSource 对象来确定如何读取 XML 输入
InputSource source = new InputSource(read);
// 创建一个新的SAXBuilder
SAXBuilder sb = new SAXBuilder();
// 通过输入源构造一个Document
org.jdom.Document doc;
doc = (org.jdom.Document) sb.build(source);
org.jdom.Element root = doc.getRootElement();// 指向根节点
List<org.jdom.Element> list = root.getChildren();
Map<String, String> msg = new HashMap<String, String>();
if(list!=null&&list.size()>0){
for (org.jdom.Element element : list) {
msg.put(element.getName(), element.getText());
}
}
return msg;
}