1.支付宝开放平台https://open.alipay.com 新增应用并签约手机网站支付/APP支付。

2.服务端使用java, 集成支付宝sdk。

3.为方便以后更多支付方式扩展, 先定义接口, 需要新的支付方式只需实现该接口, 以支付宝为例。

public interface AliPayConfig {

/**

* 获取 App ID

*

* @return App ID

*/

String getAppID();

/**

* 获取 APP_PRIVATE_KEY

*

* @return APP_PRIVATE_KEY

*/

String getAppPrivateKey();

/**

* 获取 ALIPAY_PUBLIC_KEY

*

* @return ALIPAY_PUBLIC_KEY

*/

String getAlipayPublicKey();

/**

* 获取 支付宝网关

*

* @return 支付宝网关

*/

String getAlipayGateway();

/**

* 获取 json

*

* @return json

*/

String getFormat();

/**

* 获取 Charset

*

* @return Charset

*/

String getCharset();

/**

* 获取 SignType

*

* @return SignType

*/

String getSignType();

}

4.现在想对接支付宝的手机支付接口, 先实现配置接口。

public class AliWapConfig implements AliPayConfig {

//沙箱账号

private static final String ALIPAY_APP_ID = "";

private static final String ALIPAY_GATEWAY = "https://openapi.alipaydev.com/gateway.do";

private static final String ALIPAY_APP_PRIVATE_KEY = "";

private static final String ALIPAY_PUBLIC_KEY = "";

@Override

public String getAppID() {

return ALIPAY_APP_ID;

}

@Override

public String getAppPrivateKey() {

return ALIPAY_APP_PRIVATE_KEY;

}

@Override

public String getAlipayPublicKey() {

return ALIPAY_PUBLIC_KEY;

}

@Override

public String getAlipayGateway() {

return ALIPAY_GATEWAY;

}

@Override

public String getFormat() {

return "json";

}

@Override

public String getCharset() {

return "UTF-8";

}

@Override

public String getSignType() {

return "RSA2";

}

}

5.实例化配置对象, 各种支付方式集成。

@Configuration

public class Config {

@Value("${weixin.pay.useSandbox:false}")

private boolean useSandbox;

@Autowired

private OkHttpClient okHttpClient;

@Bean

public WxConfig wxConfig() {

return new WxConfig();

}

@Bean

public WxMiniConfig wxMiniConfig() {

return new WxMiniConfig();

}

@Bean

public WxFasterConfig wxFasterConfig() {

return new WxFasterConfig();

}

@Bean

public AliWapConfig aliWapConfig() {

return new AliWapConfig();

}

@Bean("wxAPay") //微信app_A支付

public WXPay wxAPay() {

return new WXPay(wxConfig(), WXPayConstants.SignType.MD5, useSandbox, okHttpClient);

}

@Bean("wxMiniPay") //微信小程序支付

public WXPay wxMiniPay() {

return new WXPay(wxMiniConfig(), WXPayConstants.SignType.MD5, useSandbox, okHttpClient);

}

@Bean("wxBPay") //微信app_B支付

public WXPay wxBPay() {

return new WXPay(wxFasterConfig(), WXPayConstants.SignType.MD5, useSandbox, okHttpClient);

}

@Bean("aliWapPay") //支付宝H5支付

public AlipayClient aliFasterWapClient() {

AliWapConfig config = aliWapConfig();

return new DefaultAlipayClient(config.getAlipayGateway(),

config.getAppID(), config.getAppPrivateKey(), config.getFormat(), config.getCharset(),

config.getAlipayPublicKey(), config.getSignType());

}

}

6.配置类写好之后就可以下单了

public Order order4F(@RequestBody Order order) {

//生成订单操作

//先保存订单信息，供失败后可以查询

saveOrder(order);

switch (order.getPayType()) {

case Order.PAY_TYPE_WXPAY://微信支付

wxOrder(order);

break;

case Order.PAY_TYPE_ALIPAY://支付宝支付

aliOrder4Wap(order);

break;

default:

break;

}

//微信支付更新订单prepayId

if (Order.PAY_TYPE_WXPAY.equals(order.getPayType())) {

saveOrder(order);

}

return order;

}

private void aliOrder4Wap(Order order) {

if (!Order.PAY_TYPE_ALIPAY.equalsIgnoreCase(order.getPayType())) {

return;

}

AlipayTradeWapPayRequest alipayRequest = new AlipayTradeWapPayRequest();

alipayRequest.setReturnUrl("http://domain.com/CallBack/return_url.jsp");

alipayRequest.setNotifyUrl(alipayNotifyUrl);

alipayRequest.setBizContent("{" +

" \"out_trade_no\":\"" + order.getBizId() + "\"," +

" \"total_amount\":\"" + order.getAmount() + "\"," +

" \"subject\":\"***\"," +

" \"product_code\":\"QUICK_MSECURITY_PAY\"" +

" }");//填充业务参数

//支付宝返回的form表单

String form="";

try {

form = alipayClient.pageExecute(alipayRequest).getBody();

logger.warn("支付宝订单生成结果：" + form);

} catch (AlipayApiException e) {

logger.error(e.getErrMsg(), e);

ServiceException.builder().setErrorMsg(e.getErrMsg()).throwEx();

}

order.setForm(form);

}

7.拿到上面接口返回的form表单, 在前台工程通过response直接返回即可, 剩下的交给前端, 走完支付流程即可,到此结束。