淘东电商项目（58） -聚合支付（基于设计模式自动跳转支付接口）

if("yinlian_pay".equals(CHANNEL_ID)){
  //银联支付的具体实现
}else if("ali_pay".equals(CHANNEL_ID)){
    //支付宝支付的具体实现
}

/**
 * description: 支付接口共同实现行为算法
 * create by: YangLinWei
 * create time: 2020/5/13 4:41 下午
 */
public interface PayStrategy {
    /**
     * @param pymentChannel     渠道参数
     * @param payMentTransacDTO 支付参数
     * @return
     */
    public String toPayHtml(PaymentChannelEntity pymentChannel, PayMentTransacDTO payMentTransacDTO);
}

/**
 * description: 支付宝支付渠道
 * create by: YangLinWei
 * create time: 2020/5/13 4:41 下午
 */
@Slf4j
public class AliPayStrategy implements PayStrategy {
  @Override
  public String toPayHtml(PaymentChannelEntity pymentChannel, PayMentTransacDTO payMentTransacDTO) {
    log.info(">>>>>支付宝参数封装开始<<<<<<<<");
    return "支付宝支付from表单提交";
  }
}

/**
 * description: 银联支付渠道实现
 * create by: YangLinWei
 * create time: 2020/5/13 4:41 下午
 */
@Slf4j
public class UnionPayStrategy implements PayStrategy {
    @Override
    public String toPayHtml(PaymentChannelEntity pymentChannel, PayMentTransacDTO payMentTransacDTO) {
        log.info(">>>>>银联参数封装开始<<<<<<<<");
        // Plugin
        return "银联支付from表单提交";
    }
}

public interface PayContextService {
    @GetMapping("/toPayHtml")
    public BaseResponse<JSONObject> toPayHtml(String channelId, String payToken);
}

@RestController
public class PayContextServiceImpl extends BaseApiService<JSONObject> implements PayContextService {
  @Autowired
  private PaymentChannelMapper paymentChannelMapper;
  @Autowired
  private PayMentTransacInfoService payMentTransacInfoService;
  @Override
  public BaseResponse<JSONObject> toPayHtml(String channelId, String payToken) {
    // 1.使用渠道id获取渠道信息 classAddres
    PaymentChannelEntity pymentChannel = paymentChannelMapper.selectBychannelId(channelId);
    if (pymentChannel == null) {
      return setResultError("没有查询到该渠道信息");
    }
    // 2.使用payToken获取支付参数
    BaseResponse<PayMentTransacDTO> tokenByPayMentTransac = payMentTransacInfoService
        .tokenByPayMentTransac(payToken);
    if (!isSuccess(tokenByPayMentTransac)) {
      return setResultError(tokenByPayMentTransac.getMsg());
    }
    PayMentTransacDTO payMentTransacDTO = tokenByPayMentTransac.getData();
    // 3.执行具体的支付渠道的算法获取html表单数据 策略设计模式 使用java反射机制 执行具体方法
    String classAddres = pymentChannel.getClassAddres();
    PayStrategy payStrategy = StrategyFactory.getPayStrategy(classAddres);
    String payHtml = payStrategy.toPayHtml(pymentChannel, payMentTransacDTO);
    // 4.直接返回html
    JSONObject data = new JSONObject();
    data.put("payHtml", payHtml);
    return setResultSuccess(data);
  }

/**
 * description: 初始化不同的策略行为
 * create by: YangLinWei
 * create time: 2020/5/13 4:45 下午
 */
public class StrategyFactory {
    private static Map<String, PayStrategy> strategyBean = new ConcurrentHashMap<String, PayStrategy>();
    public static PayStrategy getPayStrategy(String classAddres) {
        try {
            if (StringUtils.isEmpty(classAddres)) {
                return null;
            }
            PayStrategy beanPayStrategy = strategyBean.get(classAddres);
            if (beanPayStrategy != null) {
                return beanPayStrategy;
            }
            // 1.使用Java的反射机制初始化子类
            Class<?> forName = Class.forName(classAddres);
            // 2.反射机制初始化对象
            PayStrategy payStrategy = (PayStrategy) forName.newInstance();
            strategyBean.put(classAddres, payStrategy);
            return payStrategy;
        } catch (Exception e) {
            return null;
        }
    }
}

INSERT INTO `taodong-pay`.`payment_channel`(`ID`, `CHANNEL_NAME`, `CHANNEL_ID`, `MERCHANT_ID`, `SYNC_URL`, `ASYN_URL`, `PUBLIC_KEY`, `PRIVATE_KEY`, `CHANNEL_STATE`, `REVISION`, `CREATED_BY`, `CREATED_TIME`, `UPDATED_BY`, `UPDATED_TIME`, `CLASS_ADDRES`) VALUES (1, '银联支付', 'yinlian_pay', '777290058110048', 'http://localhost:8080/ACPSample_B2C/frontRcvResponse', 'http://222.222.222.222:8080/ACPSample_B2C/backRcvResponse', NULL, NULL, 0, NULL, NULL, NULL, NULL, NULL, 'com.ylw.service.pay.strategy.impl.UnionPayStrategy');
INSERT INTO `taodong-pay`.`payment_channel`(`ID`, `CHANNEL_NAME`, `CHANNEL_ID`, `MERCHANT_ID`, `SYNC_URL`, `ASYN_URL`, `PUBLIC_KEY`, `PRIVATE_KEY`, `CHANNEL_STATE`, `REVISION`, `CREATED_BY`, `CREATED_TIME`, `UPDATED_BY`, `UPDATED_TIME`, `CLASS_ADDRES`) VALUES (2, '支付宝', 'ali_pay', '777666655522521', 'test', 'test', NULL, NULL, 0, NULL, NULL, NULL, NULL, NULL, 'com.ylw.service.pay.strategy.impl.AliPayStrategy');

INSERT INTO `taodong-pay`.`payment_channel`(`ID`, `CHANNEL_NAME`, `CHANNEL_ID`, `MERCHANT_ID`, `SYNC_URL`, `ASYN_URL`, `PUBLIC_KEY`, `PRIVATE_KEY`, `CHANNEL_STATE`, `REVISION`, `CREATED_BY`, `CREATED_TIME`, `UPDATED_BY`, `UPDATED_TIME`, `CLASS_ADDRES`) VALUES (3, '微信支付', 'weixin_pay', '777566655521234', 'test', 'test', NULL, NULL, 0, NULL, NULL, NULL, NULL, NULL, 'com.ylw.service.pay.strategy.impl.WeixinPayStrategy');

/**
 * description: 微信支付渠道
 * create by: YangLinWei
 * create time: 2020/5/13 5:10 下午
 */
@Slf4j
public class WeixinPayStrategy implements PayStrategy {
    @Override
    public String toPayHtml(PaymentChannelEntity pymentChannel, PayMentTransacDTO payMentTransacDTO) {
        log.info(">>>>>微信参数封装开始<<<<<<<<");
        // Plugin
        return "微信支付from表单提交";
    }
}