Java后台实现微信支付和微信退款
微信支付流程
都是我自己工作中开发的,亲测可用,不喜勿喷。
controller中我是这么写的,你们需要根据自己的业务需求改动。ResponseBean是我自己封装的,你们可以改成你们想要的形式。
/** * 微信统一下单接口 * @return */ @RequestMapping(value = '/doUnifiedOrder', method = RequestMethod.POST) public ResponseBean doUnifiedOrder(@RequestBody Map<String,Object> req) { Map resultMap=new HashMap(); String openid = (String) req.get('openId'); WXPay wxpay =null; try { //初始化证书 myConfig.initCert(); wxpay= new WXPay(myConfig); } catch (Exception e) { e.printStackTrace(); } //生成的随机字符串 String nonce_str = WXPayUtil.generateNonceStr(); //获取客户端的ip地址 //获取本机的ip地址 InetAddress addr = null; try { addr = InetAddress.getLocalHost(); } catch (UnknownHostException e) { e.printStackTrace(); } //支付金额,需要转成字符串类型,否则后面的签名会失败 String payOutMoney = WxMoney.changeY2F(String.valueOf(req.get('money'))); String tradeName = (String) req.get('tradeName'); if(tradeName!=null&&tradeName.length()>0){ }else{ tradeName = '课程支付'; } String body = tradeName; //商户订单号 String out_trade_no= WXPayUtil.generateNonceStr(); //统一下单接口参数 HashMap<String, String> data = new HashMap<String, String>(); data.put('appid', 你的appid); data.put('mch_id', 商户id); data.put('nonce_str', nonce_str); data.put('body', body); data.put('out_trade_no',out_trade_no); data.put('total_fee', payOutMoney); data.put('spbill_create_ip', '127.0.0.1'); data.put('notify_url', 回调地址); data.put('trade_type','JSAPI'); data.put('openid', openid); try { Map<String, String> rMap = wxpay.unifiedOrder(data); String return_code = (String) rMap.get('return_code'); String result_code = (String) rMap.get('result_code'); String nonceStr = WXPayUtil.generateNonceStr(); resultMap.put('nonceStr', nonceStr); Long timeStamp = System.currentTimeMillis() / 1000; if ('SUCCESS'.equals(return_code) && return_code.equals(result_code)) { String prepayid = rMap.get('prepay_id'); resultMap.put('package', 'prepay_id='+prepayid); resultMap.put('signType', 'MD5'); //这边要将返回的时间戳转化成字符串,不然小程序端调用wx.requestPayment方法会报签名错误 resultMap.put('timeStamp', timeStamp + ''); //再次签名,这个签名用于小程序端调用wx.requesetPayment方法 resultMap.put('appId',myConfig.getAppID()); String sign = WXPayUtil.generateSignature(resultMap, myConfig.getKey()); resultMap.put('paySign', sign); resultMap.put('out_trade_no',out_trade_no); ResponseBean responseBean = new ResponseBean(HttpStatus.OK.value(),'微信支付',resultMap); return responseBean; }else{ResponseBean responseBean = new ResponseBean(HttpStatus.OK.value(),'微信支付失败','微信支付失败');return responseBean; } } catch (Exception e) { ResponseBean responseBean = new ResponseBean(HttpStatus.OK.value(),'微信支付失败','微信支付失败'); e.printStackTrace(); return responseBean; } }
微信退款代码(需要传退款的订单id)
public ResponseBean refund(Map<String, Object> req) { Map resultMap=new HashMap(); String buyId = (String) req.get('buyId'); WXPay wxpay =null; try { myConfig.initCert();//初始化证书 wxpay= new WXPay(myConfig); } catch (Exception e) { e.printStackTrace(); } //生成的随机字符串 String nonce_str = WXPayUtil.generateNonceStr(); //获取客户端的ip地址 //获取本机的ip地址 InetAddress addr = null; try { addr = InetAddress.getLocalHost(); } catch (UnknownHostException e) { e.printStackTrace(); } //支付金额,需要转成字符串类型,否则后面的签名会失败// int total_fee= (int) req.get('money'); String payOutMoney = WxMoney.changeY2F(String.valueOf(req.get('money')));// String body = (String) req.get('z'); //商户订单号 String out_trade_no= WXPayUtil.generateNonceStr(); //统一下单接口参数 HashMap<String, String> data = new HashMap<String, String>(); try { data.put('appid', myConfig.getAppID()); data.put('mch_id', myConfig.getMchID()); data.put('nonce_str', nonce_str); data.put('sign_type', 'MD5'); data.put('out_trade_no',buyId);//微信订单号 data.put('out_refund_no', out_trade_no);//商户退款单号 data.put('total_fee',payOutMoney);//支付金额,微信支付提交的金额是不能带小数点的,且是以分为单位,这边需要转成字符串类型,否则后面的签名会失败 data.put('refund_fee',payOutMoney);//退款总金额,订单总金额,单位为分,只能为整数 //MD5运算生成签名,这里是第一次签名,用于调用统一下单接口 String sign = WXPayUtil.generateSignature(data, myConfig.getKey()); data.put('sign', sign); Map<String, String> rMap = wxpay.refund(data); String return_code = (String) rMap.get('return_code'); String result_code = (String) rMap.get('result_code'); Long timeStamp = System.currentTimeMillis() / 1000; if ('SUCCESS'.equals(return_code) && return_code.equals(result_code)) {ResponseBean responseBean = new ResponseBean(HttpStatus.OK.value(),'微信退款成功',rMap);return responseBean; }else{ResponseBean responseBean = new ResponseBean(HttpStatus.OK.value(),'微信退款失败','微信支付失败');return responseBean; } } catch (Exception e) { ResponseBean responseBean = new ResponseBean(HttpStatus.OK.value(),'微信退款失败','微信支付失败'); e.printStackTrace(); return responseBean; } }
需要用到的工具类
然后在MyConfig中配置一下你们的小程序参数就行了,如果需要添加退款功能必须配置商户证书(对应在你项目中的位置)。不需要的话就把initCert方法去掉。
public class MyConfig extends WXPayConfig { @Value('${res.imgPath}') public String imgPath; private byte[] certData; @Override public String getAppID() { return '你的小程序id'; } @Override public String getMchID() { return '商户id'; } @Override public String getKey() { return '商户秘钥'; } @Override public InputStream getCertStream() { ByteArrayInputStream certBis = new ByteArrayInputStream(this.certData); return certBis; } @Override public int getHttpConnectTimeoutMs() { return 8000; } @Override public int getHttpReadTimeoutMs() { return 10000; } @Override IWXPayDomain getWXPayDomain() { return new IWXPayDomain() { @Override public void report(String domain, long elapsedTimeMillis, Exception ex) { } @Override public DomainInfo getDomain(WXPayConfig config) {return new DomainInfo('api.mch.weixin.qq.com', false); } }; } @Override public void initCert() throws Exception { String certPath = this.imgPath+'/upload/cert/'+'apiclient_cert.p12';//从微信商户平台下载的安全证书存放的目录 System.out.println(certPath); File file = new File(certPath); InputStream certStream = new FileInputStream(file); this.certData = new byte[(int) file.length()]; certStream.read(this.certData); certStream.close(); }}
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