第三方通过微信APP支付流程
本章文献基本都来源于微信支付平台,详情请看微信官方文档:APP支付
系统交互图
文档位置:https://pay.weixin.qq.com/wiki/doc/api/app/app.php?chapter=8_3 APP支付-业务流程
根据文档内容,服务端只要做好获取 prepay_id 和 sign 传送给客户端,并做好回调接收处理就行
服务端demo
APP支付文档里面的demo,主要是供客户端使用的,对后台来说,基本没什么用。
不过,依旧有我们后端可以直接拿来使用的demo: https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=11_1
这个demo主要用于付款码/扫码/H5支付使用,但里面提供了很多方便的工具类。
这里我们引用demo里面的工具类并继承WXPayConfig和实现IWXPayDomain的抽象接口。
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public class WxPayConfigImpl extends WXPayConfig{
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// 设置应用Id
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public static String appid = "2019102168481752";
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// 设置商户号
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public static String mch_id = "1230000109";
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// 设置设备号(终端设备号(门店号或收银设备ID),默认请传"WEB",非必需)
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public static String device_info = "WEB";
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// 设置字符集
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public static String key = "192006250b4c09247ec02edce69f6a2d";
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private static WxPayConfigImpl INSTANCE;
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public static WxPayConfigImpl getInstance() throws Exception {
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if (INSTANCE == null) {
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synchronized (WxPayConfigImpl.class) {
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if (INSTANCE == null) {
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INSTANCE = new WxPayConfigImpl();
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}
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}
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}
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return INSTANCE;
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}
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@Override
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public String getAppID() {
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return appid;
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}
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@Override
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public String getMchID() {
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return mch_id;
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}
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@Override
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public String getKey() {
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return key;
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}
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@Override
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public InputStream getCertStream() {
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//这个可以看我另一篇“支付宝:APP支付接口2.0(alipay.trade.app.pay)”
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//里的“使用demo”步骤,有讲解,如果是个springboot构成的jar,如何设置证书路径
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//文章链接:https://blog.****.net/u014799292/article/details/102680149
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String fileUrl = "证书路径";
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InputStream certStream = Thread.currentThread().getContextClassLoader().getResourceAsStream(fileUrl);
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byte[] certData = null;
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try {
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certData = IOUtils.toByteArray(certStream);
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} catch (IOException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}finally{
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if(certStream != null){
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try {
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certStream.close();
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} catch (IOException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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}
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}
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return new ByteArrayInputStream(certData);
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}
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@Override
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public IWXPayDomain getWXPayDomain() {
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return WxPayDomainImpl.instance();
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}
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}
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public class WxPayDomainImpl implements IWXPayDomain {
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private final int MIN_SWITCH_PRIMARY_MSEC = 3 * 60 * 1000; //3 minutes
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private long switchToAlternateDomainTime = 0;
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private Map<String, DomainStatics> domainData = new HashMap<String, DomainStatics>();
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private WxPayDomainImpl(){
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}
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private static class WxpayDomainHolder{
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private static IWXPayDomain holder = new WxPayDomainImpl();
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}
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public static IWXPayDomain instance(){
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return WxpayDomainHolder.holder;
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}
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@Override
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public void report(String domain, long elapsedTimeMillis, Exception ex) {
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DomainStatics info = domainData.get(domain);
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if(info == null){
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info = new DomainStatics(domain);
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domainData.put(domain, info);
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}
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if(ex == null){ //success
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if(info.succCount >= 2){ //continue succ, clear error count
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info.connectTimeoutCount = info.dnsErrorCount = info.otherErrorCount = 0;
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}else{
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++info.succCount;
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}
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}else if(ex instanceof ConnectTimeoutException){
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info.succCount = info.dnsErrorCount = 0;
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++info.connectTimeoutCount;
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}else if(ex instanceof UnknownHostException){
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info.succCount = 0;
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++info.dnsErrorCount;
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}else{
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info.succCount = 0;
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++info.otherErrorCount;
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}
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}
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@Override
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public DomainInfo getDomain(WXPayConfig config) {
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DomainStatics primaryDomain = domainData.get(WXPayConstants.DOMAIN_API);
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if(primaryDomain == null ||
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primaryDomain.isGood()) {
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return new DomainInfo(WXPayConstants.DOMAIN_API, true);
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}
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long now = System.currentTimeMillis();
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if(switchToAlternateDomainTime == 0){ //first switch
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switchToAlternateDomainTime = now;
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return new DomainInfo(WXPayConstants.DOMAIN_API2, false);
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}else if(now - switchToAlternateDomainTime < MIN_SWITCH_PRIMARY_MSEC){
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DomainStatics alternateDomain = domainData.get(WXPayConstants.DOMAIN_API2);
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if(alternateDomain == null ||
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alternateDomain.isGood() ||
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alternateDomain.badCount() < primaryDomain.badCount()){
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return new DomainInfo(WXPayConstants.DOMAIN_API2, false);
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}else{
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return new DomainInfo(WXPayConstants.DOMAIN_API, true);
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}
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}else{ //force switch back
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switchToAlternateDomainTime = 0;
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primaryDomain.resetCount();
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DomainStatics alternateDomain = domainData.get(WXPayConstants.DOMAIN_API2);
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if(alternateDomain != null)
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alternateDomain.resetCount();
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return new DomainInfo(WXPayConstants.DOMAIN_API, true);
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}
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}
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static class DomainStatics {
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final String domain;
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int succCount = 0;
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int connectTimeoutCount = 0;
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int dnsErrorCount =0;
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int otherErrorCount = 0;
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DomainStatics(String domain) {
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this.domain = domain;
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}
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void resetCount(){
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succCount = connectTimeoutCount = dnsErrorCount = otherErrorCount = 0;
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}
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boolean isGood(){ return connectTimeoutCount <= 2 && dnsErrorCount <= 2; }
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int badCount(){
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return connectTimeoutCount + dnsErrorCount * 5 + otherErrorCount / 4;
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}
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}
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}
给 WXPayUtil 再添加几个时间工具方法(看自己需求定制),项目会在最后附链接。
appid & 商户号位置
登录商户平台-产品中心-账号关联(AppID绑定),进入授权申请页面;
**key位置
登录商户平台-->>账户中心-->>API安全-->>设置API**(32位,下面给出生成方式,然后复制粘贴到秘钥位置,记得保留,之后无法查看,只能再次生成,测试环境随便改,正式服记得最好固定一次,修改可能会引起服务端数据错误)
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private static final String SYMBOLS = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
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private static final Random RANDOM = new SecureRandom();
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/**
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* 获取随机字符串 Nonce Str
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*
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* @return String 随机字符串
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*/
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public static String generateNonceStr() {
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char[] nonceChars = new char[32];
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for (int index = 0; index < nonceChars.length; ++index) {
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nonceChars[index] = SYMBOLS.charAt(RANDOM.nextInt(SYMBOLS.length()));
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}
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return new String(nonceChars);
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}
再来写一个请求类,处理微信订单(订单--统一下单/调起支付接口/支付结果通知/查询订单/关闭订单)
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/**
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* 订单--统一下单/调起支付接口/退款/结果通知/查询订单/关闭订单
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* 借鉴:https://blog.****.net/asd54090/article/details/81028323
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*/
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public class WxAppPayRequest {
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private static final Logger logger = LoggerFactory.getLogger(WxAppPayRequest.class);
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private WxPayConfigImpl config;
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private WXPay wxpay;
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/**
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* 微信支付请求
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*/
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public WxAppPayRequest() {
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try {
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config = WxPayConfigImpl.getInstance();
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wxpay = new WXPay(config);
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} catch (Exception e) {
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e.printStackTrace();
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logger.error("微信配置初始化错误", e);
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}
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}
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/**
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* APP支付订单请求
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*
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* @param body
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* 格式:APP名字-实际商品名称,如:天天爱消除-游戏充值
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* @param attach
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* 附加数据,在查询API和支付通知中原样返回
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* @param outTradeNo
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* 商户订单号
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* @param totalFee
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* 总金额
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* @param startTime
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* 订单开始时间String格式: yyyy-MM-dd HH:mm:ss
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* @param expireMinute
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* 有效时间(分钟)
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* @param notifyUrl
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* 微信支付异步通知回调地址
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* @return
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*/
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private WxAppPayResponseCode getOrderSign(String body, String attach, String outTradeNo, BigDecimal totalFee,
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String startTime, int expireMinute, String notifyUrl) {
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// 准备好请求参数
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Map<String, String> map = new HashMap<String, String>();
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map.put("device_info", WxPayConfigImpl.device_info);
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map.put("body", body);
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if (attach != null && !attach.isEmpty()) {
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map.put("attach", attach);
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}
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map.put("out_trade_no", outTradeNo);
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map.put("total_fee", totalFee.toString());
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map.put("spbill_create_ip", WXPayUtil.getLocalAddress());
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map.put("time_start", WXPayUtil.getFormatTime(startTime));
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String endTime = WXPayUtil.getNSecondTime(startTime, expireMinute);
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map.put("time_expire", WXPayUtil.getFormatTime(endTime));
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map.put("notify_url", notifyUrl);
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map.put("trade_type", "APP");
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// 生成带sign的xml字符串
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Map<String, String> unifiedOrderMap = null;
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try {
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unifiedOrderMap = wxpay.unifiedOrder(map);
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if (unifiedOrderMap == null || (unifiedOrderMap != null
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&& WxAppPayResponseCode.FAIL.code().equals(unifiedOrderMap.get("return_code")))) {
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String errorMsg = "调用微信“统一下单”获取prepayid 失败...";
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logger.info("getOrderSign --unifiedOrder: 调用微信“统一下单”获取prepayid 失败.");
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logger.info("getOrderSign --unifiedOrder: 请求参数:" + map.toString());
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logger.info("getOrderSign --unifiedOrder: 返回Map:" + unifiedOrderMap);
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if (unifiedOrderMap != null) {
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errorMsg += " 异常信息为:" + unifiedOrderMap.get("return_msg");
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}
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WxAppPayResponseCode error = WxAppPayResponseCode.ERROR;
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error.setAlias(errorMsg);
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return error;
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}
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} catch (Exception e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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logger.error("getOrderSign : 调用微信“统一下单”失败 。", e);
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WxAppPayResponseCode error = WxAppPayResponseCode.ERROR;
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error.setAlias("调用微信“统一下单”失败 。" + e.toString());
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return error;
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}
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// 调用微信请求成功,但响应失败
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String resultCode = unifiedOrderMap.get("result_code");
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if (WxAppPayResponseCode.FAIL.code().equals(resultCode)) {
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WxAppPayResponseCode error = WxAppPayResponseCode.findCode(unifiedOrderMap.get("err_code"));
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return error;
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}
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return parseWXOrderResponse(unifiedOrderMap);
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}
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/**
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* 将map转成客户端订单用的封装体
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*
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* @param map
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* map
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* @return 用户端用的封装体
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*/
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private WxAppPayResponseCode parseWXOrderResponse(Map<String, String> map) {
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WxOrderResponse response = new WxOrderResponse();
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response.setAppid(map.get("appid"));
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response.setPartnerid(map.get("partnerid"));
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response.setPrepayid(map.get("prepay_id"));
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response.setPack("Sign=WXPay");
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response.setNoncestr(map.get("noncestr"));
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String timestamp = WXPayUtil.getCurrentTimestamp() + "";
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response.setTimestamp(timestamp);
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// 前人踩坑,咱们乘凉
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// sgin(签名),不是拿微信“统一下单”返回的sgin,而是自己再签一次,返回给客户端
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// 签名的参数拿的不是“统一下单”,而是拿“调起支付接口”里面的参数,这步API文档写的是客户端生成,不过咱们服务端就帮他做了
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// 注意:map的key不能是大写
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Map<String, String> params = new HashMap<>();
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params.put("appid", map.get("appid"));
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params.put("partnerid", map.get("partnerid"));
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params.put("prepayid", map.get("prepay_id"));
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params.put("package", "Sign=WXPay");
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params.put("noncestr", map.get("nonce_str"));
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params.put("timestamp", timestamp);
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try {
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// 这个sign是移动端要请求微信服务端的,也是我们要保存后面校验的
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String sgin = WXPayUtil.generateSignature(params, config.getKey());
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response.setSign(sgin);
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} catch (Exception e) {
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e.printStackTrace();
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logger.error("parseWXOrderResponse : 订单第二次供客户端签名信息失败 。");
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logger.error("parseWXOrderResponse : 请求参数:" + params.toString());
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logger.error("parseWXOrderResponse : 返回错误信息:", e);
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WxAppPayResponseCode errorData = WxAppPayResponseCode.ERROR;
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errorData.setAlias("调用支付接口生成签名sign失败!");
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return errorData;
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}
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WxAppPayResponseCode successData = WxAppPayResponseCode.SUCCESS;
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successData.setAlias(JSONObject.toJSONString(response));
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return successData;
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}
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/**
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* 查微信订单
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*
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* @param outTradeNo
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* 订单号
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*/
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public WxAppPayResponseCode queryOrderByOutTradeNo(String outTradeNo) {
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logger.info("查询微信支付订单信息,订单号为:" + outTradeNo);
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HashMap<String, String> data = new HashMap<String, String>();
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data.put("out_trade_no", outTradeNo);
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try {
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Map<String, String> orderQueryMap = wxpay.orderQuery(data);
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return disposeReturnInfo(orderQueryMap);
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} catch (Exception e) {
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e.printStackTrace();
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logger.error("queryOrderByOutTradeNo : 查询微信订单支付信息失败 。订单号:" + outTradeNo);
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logger.error("queryOrderByOutTradeNo : 返回错误信息:", e);
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WxAppPayResponseCode errorData = WxAppPayResponseCode.ERROR;
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errorData.setAlias("调用查微信订单支付信息接口失败!");
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return errorData;
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}
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}
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/**
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* 关闭订单(刚刚生成的订单不能立马关闭,要间隔5分钟,请自行做好判断)
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*
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* @param outTradeNo
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* 订单号
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* @return
-
*/
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public WxAppPayResponseCode closeOrder(String outTradeNo) {
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logger.info("关闭微信支付订单信息,订单号为:" + outTradeNo);
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HashMap<String, String> data = new HashMap<>();
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data.put("out_trade_no", outTradeNo);
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try {
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Map<String, String> closeOrderMap = wxpay.closeOrder(data);
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return disposeReturnInfo(closeOrderMap);
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} catch (Exception e) {
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e.printStackTrace();
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logger.error("closeOrder : 微信关闭订单失败 。订单号:" + outTradeNo);
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logger.error("closeOrder : 返回错误信息:", e);
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WxAppPayResponseCode errorData = WxAppPayResponseCode.ERROR;
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errorData.setAlias("调用查微信订单支付信息接口失败!");
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return errorData;
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}
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}
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/**
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* 微信退款申请
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*
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* @param outTradeNo
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* 商户订单号
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* @param amount
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* 金额
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* @param refund_desc
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* 退款原因(可空)
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* @param notifyUrl
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* 退款异步通知链接
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*
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* @return 返回map(已做过签名验证),具体数据参见微信退款API
-
*/
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public WxAppPayResponseCode refundOrder(String outTradeNo, BigDecimal amount, String refundDesc, String notifyUrl)
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throws Exception {
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Map<String, String> data = new HashMap<String, String>();
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data.put("out_trade_no", outTradeNo);
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data.put("out_refund_no", outTradeNo);
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data.put("total_fee", amount + "");
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data.put("refund_fee", amount + "");
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data.put("refund_fee_type", "CNY");
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data.put("refund_desc", refundDesc);
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data.put("notifyUrl", notifyUrl);
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try {
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Map<String, String> refundOrderMap = wxpay.refund(data);
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return disposeReturnInfo(refundOrderMap);
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} catch (Exception e) {
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e.printStackTrace();
-
logger.error("closeOrder : 微信退款申请失败 。订单号:" + outTradeNo);
-
logger.error("closeOrder : 返回错误信息:", e);
-
WxAppPayResponseCode errorData = WxAppPayResponseCode.ERROR;
-
errorData.setAlias("调用微信退款申请信息接口失败!");
-
return errorData;
-
}
-
}
-
/**
-
* 查微信退款订单 注:如果单个支付订单部分退款次数超过20次请使用退款单号查询
-
*
-
* @param outTradeNo
-
* 订单号
-
*/
-
public WxAppPayResponseCode queryRefundOrderByOutTradeNo(String outTradeNo) {
-
logger.info("查询微信支付订单信息,订单号为:" + outTradeNo);
-
HashMap<String, String> data = new HashMap<String, String>();
-
data.put("out_trade_no", outTradeNo);
-
try {
-
Map<String, String> refundQueryMap = wxpay.refundQuery(data);
-
return disposeReturnInfo(refundQueryMap);
-
} catch (Exception e) {
-
e.printStackTrace();
-
logger.error("queryRefundOrderByOutTradeNo : 查询微信退款订单信息失败 。订单号:" + outTradeNo);
-
logger.error("queryRefundOrderByOutTradeNo : 返回错误信息:", e);
-
WxAppPayResponseCode errorData = WxAppPayResponseCode.ERROR;
-
errorData.setAlias("调用查微信退款订单接口失败!");
-
return errorData;
-
}
-
}
-
/**
-
* 对接口接收成功后的返回进行处理
-
*
-
* @param resultMap
-
* @return
-
*/
-
private WxAppPayResponseCode disposeReturnInfo(Map<String, String> resultMap) {
-
if (resultMap == null
-
|| (resultMap != null && WxAppPayResponseCode.FAIL.code().equals(resultMap.get("return_code")))) {
-
WxAppPayResponseCode errorData = WxAppPayResponseCode.ERROR;
-
errorData.setAlias("调用微信接口失败!返回数据为 : " + resultMap);
-
return errorData;
-
}
-
if (WxAppPayResponseCode.FAIL.code().equals(resultMap.get("result_code"))) {
-
WxAppPayResponseCode errorData = WxAppPayResponseCode.findCode(resultMap.get("err_code"));
-
return errorData;
-
}
-
WxAppPayResponseCode successData = WxAppPayResponseCode.SUCCESS;
-
successData.setAlias(JSONObject.toJSONString(resultMap));
-
return successData;
-
}
-
/**
-
* 是否成功接收微信支付回调 用于回复微信,否则微信回默认为商户后端没有收到回调
-
*
-
* @return
-
*/
-
public String returnWXPayVerifyMsg() {
-
return "<xml>\n" + "\n" + " <return_code><![CDATA[SUCCESS]]></return_code>\n"
-
+ " <return_msg><![CDATA[OK]]></return_msg>\n" + "</xml>";
-
}
-
public static void main(String[] args) {
-
WxAppPayRequest pay = new WxAppPayRequest();
-
WxAppPayResponseCode orderSign = pay.getOrderSign("APP-商品订单支付", "data1;data2", "212458542512542542",
-
new BigDecimal("100.12"), "2019-01-02 23:55:14", 10, "http://XXX");
-
System.out.println(orderSign);
-
}
-
}
OK,基本搞定,构建成一个处理微信订单功能的JAR。
项目已推送github:https://github.com/leopardF/wxpay
最后,再次附上本次借鉴的文章:
如果问题,请提醒修正。