Java网站如何集成支付宝当面付，企业个人都能使用的支付（比较简单）

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创建应用

这个得先去登录 - 支付宝创建应用

maven配置

 <dependency><groupId>com.alipay.sdk</groupId><artifactId>alipay-sdk-java</artifactId><version>4.38.10.ALL</version></dependency>

支付服务代码

/*** 支付宝支付* @author leell* @date 2023/7/21 16:39:58*/
public interface AliPayService {/*** 预下单* @return 返回二维码链接*/String createPrecreateTrade(AliPrecreateParam param) throws RuntimeException;/*** 检查支付状态* @param orderNo 订单号* @return 支付状态 true：已支付 false：未支付*/boolean checkAlipayStatus(String orderNo) throws RuntimeException;/*** 取消支付* @param orderNo 订单号* @return 取消状态*/boolean cancelPay(String orderNo) throws RuntimeException;/*** 退款* @param orderNo 订单号* @return 取消状态*/boolean refundPay(String orderNo, BigDecimal money) throws RuntimeException;/*** 验证签名* @param params 参数* @return 状态*/boolean rsaCheckV1(Map<String,String> params) throws RuntimeException;/*** 检查回调支付状态* @param params 参数* @return 状态* @throws RuntimeException 异常*/boolean checkNotifyPayStatus(Map<String,String> params) throws RuntimeException;/*** 获取订单号* @param params 支付宝返回参数* @return 订单号*/String getOrderNo(Map<String,String> params);
}

/*** 支付宝支付** @author leell* @date 2023/7/21 16:46:16*/
@Service
public class AliPayServiceImpl implements AliPayService {@Autowiredprivate PayHelper payHelper;@Autowiredprivate ConfigService configService;@Overridepublic String createPrecreateTrade(AliPrecreateParam param) throws RuntimeException {try {AlipayClient alipayClient = payHelper.getAlipayClient();AlipayTradePrecreateRequest request = new AlipayTradePrecreateRequest();//异步接收地址，仅支持http/https，公网可访问request.setNotifyUrl(param.getNotifyUrl());JSONObject bizContent = new JSONObject();bizContent.put("out_trade_no", param.getOutTradeNo());bizContent.put("total_amount", param.getTotalAmount());bizContent.put("subject", param.getSubject());request.setBizContent(bizContent.toString());AlipayTradePrecreateResponse response = alipayClient.execute(request);AssertUtil.isTrue(response.isSuccess(), response.getMsg());return response.getQrCode();} catch (Exception e) {throw new RuntimeException(e);}}@Overridepublic boolean checkAlipayStatus(String orderNo) throws RuntimeException {try {AlipayClient alipayClient = payHelper.getAlipayClient();AlipayTradeQueryRequest request = new AlipayTradeQueryRequest();JSONObject bizContent = new JSONObject();bizContent.put("out_trade_no", orderNo);bizContent.put("query_options", new String[]{"trade_settle_info"});request.setBizContent(bizContent.toString());AlipayTradeQueryResponse response = alipayClient.execute(request);JSONObject tradeResponse = JSONObject.parseObject(response.getBody()).getJSONObject("alipay_trade_query_response");String result = tradeResponse.getString("trade_status");return "TRADE_SUCCESS".equals(result);} catch (Exception e) {throw new RuntimeException(e);}}@Overridepublic boolean cancelPay(String orderNo) throws RuntimeException {try {AlipayClient alipayClient = payHelper.getAlipayClient();AlipayTradeCancelRequest request = new AlipayTradeCancelRequest();JSONObject bizContent = new JSONObject();bizContent.put("out_trade_no", orderNo);request.setBizContent(bizContent.toString());AlipayTradeCancelResponse response = alipayClient.execute(request);return response.isSuccess();} catch (Exception e) {throw new RuntimeException(e);}}@Overridepublic boolean refundPay(String orderNo, BigDecimal money) throws RuntimeException {try {AlipayClient alipayClient = payHelper.getAlipayClient();AlipayTradeRefundRequest request = new AlipayTradeRefundRequest();JSONObject bizContent = new JSONObject();bizContent.put("refund_amount", money);bizContent.put("out_trade_no", orderNo);request.setBizContent(bizContent.toString());AlipayTradeRefundResponse response = alipayClient.execute(request);return response.isSuccess();} catch (Exception e) {throw new RuntimeException(e);}}@Overridepublic boolean rsaCheckV1(Map<String, String> params) throws RuntimeException {try {String alipayPublicKey = configService.getValue("pay_alipay_public_key");String charset = configService.getValue("pay_alipay_charset");String signType = configService.getValue("pay_alipay_signType");return AlipaySignature.rsaCheckV1(params, alipayPublicKey, charset, signType);} catch (Exception e) {throw new RuntimeException(e);}}@Overridepublic boolean checkNotifyPayStatus(Map<String, String> params) throws RuntimeException {// 取得支付宝POST过来的异步通知参数，进行验签// 注意：调用SDK验证签名需要使用支付宝公钥，不要使用自己生成的RSA公私钥对boolean verifyResult = this.rsaCheckV1(params);if (verifyResult) {// 验签通过String tradeStatus = params.get("trade_status");return "TRADE_SUCCESS".equals(tradeStatus) || "TRADE_FINISHED".equals(tradeStatus);}return false;}@Overridepublic String getOrderNo(Map<String, String> params) {// 处理交易成功的逻辑return params.get("out_trade_no");}
}