订单、支付、退款、发货、退货等编号自动生成类

在商城网站中，订单编号的自动生成，ERP中各个单据的编号自动生成，都可以按照一下的方式来自动生成。

第一步：定义常量订单编号前缀、订单编号起始数、订单编号步长；

 public static final String ORDER_SN_PREFIX = "";// 订单编号前缀 
 public static final long ORDER_SN_FIRST = 100000L;// 订单编号起始数
 public static final long ORDER_SN_STEP = 1L;// 订单编号步长

第二步：定义订单的最后一个编号号码；

 public static Long lastOrderSnNumber;      //最后的订单编号号码

第三步：获取数据库中订单号为最后一个的订单编号，并赋值给lastOrderSnNumber

// 订单编号
  OrderService orderService = (OrderService) SpringUtil.getBean("orderServiceImpl");
  String lastOrderSn = orderService.getLastOrderSn();
  if (StringUtils.isNotEmpty(lastOrderSn)) {
   lastOrderSnNumber = Long.parseLong(StringUtils.removeStartIgnoreCase(lastOrderSn, ORDER_SN_PREFIX));
  } else {
   lastOrderSnNumber = ORDER_SN_FIRST;
  }

第四步：生成最新的订单号

/**
  * 生成订单编号
  * @return 订单编号
  */
 public synchronized static String buildOrderSn() {
  lastOrderSnNumber += ORDER_SN_STEP;
  return ORDER_SN_PREFIX + lastOrderSnNumber;
 }

第五步：调用编号生成的方法

order.setOrderSn(SerialNumberUtil.buildOrderSn());

个人一些看法，这些单据编号的自动生成，都是在写代码的时候定义好的，以后编号更改形式要是变了呢，是否可以改进，个人觉得应该可以改成配置的形式。

一个完整的类如下，在这里记下，为以后开发用：

package net.shopxx.util;
import java.util.UUID;
import net.shopxx.service.OrderService;
import net.shopxx.service.PaymentService;
import net.shopxx.service.RefundService;
import net.shopxx.service.ReshipService;
import net.shopxx.service.ShippingService;
import org.apache.commons.lang3.StringUtils;
/**
 * 工具类 - 编号生成
 */
public class SerialNumberUtil {
 
 public static final String PRODUCT_SN_PREFIX = "SN_";// 货号前缀
 
 public static final String ORDER_SN_PREFIX = "";// 订单编号前缀 
 public static final long ORDER_SN_FIRST = 100000L;// 订单编号起始数
 public static final long ORDER_SN_STEP = 1L;// 订单编号步长
 
 public static final String PAYMENT_SN_PREFIX = "";// 支付编号前缀
 public static final long PAYMENT_SN_FIRST = 100000L;// 支付编号起始数
 public static final long PAYMENT_SN_STEP = 1L;// 支付编号步长
 
 public static final String REFUND_SN_PREFIX = "";// 退款编号前缀
 public static final long REFUND_SN_FIRST = 100000L;// 退款编号起始数
 public static final long REFUND_SN_STEP = 1L;// 退款编号步长
 
 public static final String SHIPPING_SN_PREFIX = "";// 发货编号前缀
 public static final long SHIPPING_SN_FIRST = 100000L;// 发货编号起始数
 public static final long SHIPPING_SN_STEP = 1L;// 发货编号步长
 
 public static final String RESHIP_SN_PREFIX = "";// 退货编号前缀
 public static final long RESHIP_SN_FIRST = 100000L;// 退货编号起始数
 public static final long RESHIP_SN_STEP = 1L;// 退货编号步长
 
 public static Long lastOrderSnNumber;      //最后的订单编号号码
 public static Long lastPaymentSnNumber;
 public static Long lastRefundSnNumber;
 public static Long lastShippingSnNumber;
 public static Long lastReshipSnNumber;
 public static Long lastTenpayTransactionIdNumber;
 static {
  // 订单编号
  OrderService orderService = (OrderService) SpringUtil.getBean("orderServiceImpl");
  String lastOrderSn = orderService.getLastOrderSn();
  if (StringUtils.isNotEmpty(lastOrderSn)) {
   lastOrderSnNumber = Long.parseLong(StringUtils.removeStartIgnoreCase(lastOrderSn, ORDER_SN_PREFIX));
  } else {
   lastOrderSnNumber = ORDER_SN_FIRST;
  }
  
  // 支付编号
  PaymentService paymentService = (PaymentService) SpringUtil.getBean("paymentServiceImpl");
  String lastPaymentSn = paymentService.getLastPaymentSn();
  if (StringUtils.isNotEmpty(lastPaymentSn)) {
   lastPaymentSnNumber = Long.parseLong(StringUtils.removeStartIgnoreCase(lastPaymentSn, PAYMENT_SN_PREFIX));
  } else {
   lastPaymentSnNumber = PAYMENT_SN_FIRST;
  }
  
  // 退款编号
  RefundService refundService = (RefundService) SpringUtil.getBean("refundServiceImpl");
  String lastRefundSn = refundService.getLastRefundSn();
  if (StringUtils.isNotEmpty(lastRefundSn)) {
   lastRefundSnNumber = Long.parseLong(StringUtils.removeStartIgnoreCase(lastRefundSn, REFUND_SN_PREFIX));
  } else {
   lastRefundSnNumber = REFUND_SN_FIRST;
  }
  
  // 发货编号
  ShippingService shippingService = (ShippingService) SpringUtil.getBean("shippingServiceImpl");
  String lastShippingSn = shippingService.getLastShippingSn();
  if (StringUtils.isNotEmpty(lastShippingSn)) {
   lastShippingSnNumber = Long.parseLong(StringUtils.removeStartIgnoreCase(lastShippingSn, SHIPPING_SN_PREFIX));
  } else {
   lastShippingSnNumber = SHIPPING_SN_FIRST;
  }
  
  // 退货编号
  ReshipService reshipService = (ReshipService) SpringUtil.getBean("reshipServiceImpl");
  String lastReshipSn = reshipService.getLastReshipSn();
  if (StringUtils.isNotEmpty(lastReshipSn)) {
   lastReshipSnNumber = Long.parseLong(StringUtils.removeStartIgnoreCase(lastReshipSn, RESHIP_SN_PREFIX));
  } else {
   lastReshipSnNumber = RESHIP_SN_FIRST;
  }
 }
 
 /**
  * 生成货号
  * 
  * @return 货号
  */
 public static String buildProductSn() {
  String uuid = UUID.randomUUID().toString();
  return PRODUCT_SN_PREFIX + (uuid.substring(0, 8) + uuid.substring(9, 13)).toUpperCase();
 }
 
 /**
  * 生成订单编号
  * @return 订单编号
  */
 public synchronized static String buildOrderSn() {
  lastOrderSnNumber += ORDER_SN_STEP;
  return ORDER_SN_PREFIX + lastOrderSnNumber;
 }
 
 /**
  * 生成支付编号
  * @return 支付编号
  */
 public synchronized static String buildPaymentSn() {
  lastPaymentSnNumber += PAYMENT_SN_STEP;
  return PAYMENT_SN_PREFIX + lastPaymentSnNumber;
 }
 
 /**
  * 生成退款编号
  * 
  * @return 退款编号
  */
 public synchronized static String buildRefundSn() {
  lastRefundSnNumber += REFUND_SN_STEP;
  return REFUND_SN_PREFIX + lastRefundSnNumber;
 }
 
 /**
  * 生成发货编号
  * 
  * @return 发货编号
  */
 public synchronized static String buildShippingSn() {
  lastShippingSnNumber += SHIPPING_SN_STEP;
  return SHIPPING_SN_PREFIX + lastShippingSnNumber;
 }
 
 /**
  * 生成退货编号
  * 
  * @return 退货编号
  */
 public synchronized static String buildReshipSn() {
  lastReshipSnNumber += RESHIP_SN_STEP;
  return RESHIP_SN_PREFIX + lastReshipSnNumber;
 }
}