java异常处理

数据重复异常类

/**
 * 数据重复异常
 * 
 * 
 */
@SuppressWarnings("serial")
public class DuplicateDataExcepption extends Exception {

	// 重复的数据信息
	private Object data;

	public Object getData() {
		return data;
	}

	public void setData(Object data) {
		this.data = data;
	}

	/**
	 * 
	 * @param data 重复的数据
	 */
	public DuplicateDataExcepption(Object data) {
		super();
		this.data = data;
	}

	public DuplicateDataExcepption(String message) {
		super(message);
	}
	
	public DuplicateDataExcepption(String message, Object data) {
		super(message);
		this.data = data;
	}
}

库存异常类

/**
 * 库存不足异常
 * 
 *
 */
public class InventoryShortageException extends RuntimeException {
	
	private static final long serialVersionUID = -2059212682755129635L;

	/**
	 * 实际库存信息
	 */
	private GoodsInventory goodsInventory;
	
	/**
	 * 扣减库存数
	 */
	private int decreaseCount;
	
//	public InventoryShortageException() {
//		super();
//	}

	/**
	 * 
	 * @param goodsInventory 实际库存信息
	 * @param decreaseCount 扣减库存数
	 */
	public InventoryShortageException(GoodsInventory goodsInventory, int decreaseCount) {
		super();
		this.goodsInventory = goodsInventory;
		this.decreaseCount = decreaseCount;
	}
	
	/**
	 * 
	 * @param goodsSku SKU
	 * @param availableCount 实际库存
	 * @param decreaseCount 扣减库存数
	 */
	public InventoryShortageException(String goodsSku, int availableCount, int decreaseCount) {
		super();
		GoodsInventory tmp = new GoodsInventory();
		tmp.setGoodsSku(goodsSku);
		tmp.setCount(availableCount);
		this.goodsInventory = tmp;
		
		this.decreaseCount = decreaseCount;
	}

	public GoodsInventory getGoodsInventory() {
		return goodsInventory;
	}

	public void setGoodsInventory(GoodsInventory goodsInventory) {
		this.goodsInventory = goodsInventory;
	}

	public int getAmount() {
		return decreaseCount;
	}

	public void setAmount(int amount) {
		this.decreaseCount = amount;
	}

	@Override
	public String getMessage() {
		StringBuilder sb = new StringBuilder();
		sb.append("库存不足 (")
		.append("sku: ")
		.append(this.goodsInventory.getGoodsSku())
		.append(", storeId: ")
		.append(this.goodsInventory.getStoreId())
		.append(", storeShelfId: ")
		.append(this.goodsInventory.getStoreShelfId())
		.append("实际库存：").append(this.goodsInventory.getCount())
		.append("需要扣减: ").append(this.decreaseCount)
		.append(")");
		return sb.toString();
	}
	
	
}

业务层类

/**
	 * 验证sku是否库存
	 * @param order
	 * @return
	 */
	private boolean checkInventory(GoodsTransferOrder order){
		int count=0;
		for (GoodsTransferOrderItem item : order.getItems()) {
			String sku=item.getGoodsSku();
			Integer decreaseCount=item.getGoodsCount();
			Integer storeId=item.getFromStoreId();
			Integer storeShelfId=item.getFromStoreShelfId();
			if (sku == null || decreaseCount == 0) {
				return false;
			}
			
			Integer storeSum = this.goodsInventoryService.getInventory(sku, storeId, storeShelfId);
			
			//前提是存在库存信息，并且库存数足够 ，才能通过；否则抛出异常
			if (storeSum == null || storeSum < decreaseCount) {
				throw new InventoryShortageException(sku,storeSum, decreaseCount);
			}else{
				count++;
			}
		}
		
		return count==order.getItems().size();
	}

控制器类

/**
	 * 添加单
	 * @param attr
	 * @param sessionUser
	 * @param goodsSku
	 * @param goodsName
	 * @param goodsCount
	 * @param fromStoreId
	 * @param fromStoreShelfId
	 * @param toStoreId
	 * @param toStoreShelfId
	 * @param fromStoreShelf
	 * @param toStoreShelf
	 * @param order
	 * @return
	 */
	@RequestMapping("save")
	public String save(RedirectAttributes attr,
			@ModelAttribute(App.SESSION_USER_KEY) SessionUser sessionUser,
			@RequestParam("goodsSku") List<String> goodsSku,
			@RequestParam("goodsName") List<String> goodsName,
			@RequestParam("goodsCount") List<Integer> goodsCount,
			@RequestParam("fromStoreId") List<Integer> fromStoreId,
			@RequestParam("fromStoreShelfId") List<Integer> fromStoreShelfId,
			@RequestParam("toStoreId") List<Integer> toStoreId,
			@RequestParam("toStoreShelfId") List<Integer> toStoreShelfId,
			@RequestParam("fromStoreShelf") List<String> fromStoreShelf,
			@RequestParam("toStoreShelf") List<String> toStoreShelf,
			GoodsTransferOrder order){
		
		List<GoodsTransferOrderItem> items = new ArrayList<>(3);
		order.setItems(items);
		try {
			
		for (int i = 0; i < goodsSku.size(); i++) {
			GoodsTransferOrderItem item = new GoodsTransferOrderItem();
			item.setGoodsSku(goodsSku.get(i));
			item.setGoodsName(goodsName.get(i));
			item.setFromStoreId(fromStoreId.get(i));
			item.setFromStoreShelfId(fromStoreShelfId.get(i));
			item.setGoodsCount(goodsCount.get(i));
	        item.setToStoreId(toStoreId.get(i));
	        item.setToStoreShelfId(toStoreShelfId.get(i));
	        item.setFromStoreShelf(fromStoreShelf.get(i));
	        item.setToStoreShelf(toStoreShelf.get(i));
			items.add(item);
			
			if(item.getFromStoreId().equals(item.getToStoreId())){
				throw new DuplicateDataExcepption("sku:"+item.getGoodsSku()+"---->调出仓库与调入仓库不能相同");
			}
			
		 }

		 if (order.getId() == null) {
				order.setStatus(1);
				String dateStr = dft.format(Calendar.getInstance().getTime());
				String fmt =String.format("LS-%s-",dateStr)+"%d";
				order.setSerialNumber(tableKeyService.nextSerialNumber("goods_transfer_order",fmt));
				// 制单人
				order.setOperatorId(sessionUser.getUserId());
				this.goodsTransferOrderService.save(order);
				attr.addFlashAttribute("successMessage", "g.tips.success");
			 }else {
				this.goodsTransferOrderService.update(order);
				attr.addFlashAttribute("successMessage", "g.tips.success");
			 }
		  } catch (InventoryShortageException e) {
				attr.addFlashAttribute("errorMessage", e.getGoodsInventory().getGoodsSku() + "库存不足");
		  }catch(DuplicateDataExcepption e){
			  attr.addFlashAttribute("errorMessage", e.getMessage());	 
		  }
		
		return "redirect:/allocateOrder/list";
	}
	

jsp页面

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"  %>
<%@ taglib uri="http://www.springframework.org/tags" prefix="spring" %>
<c:if test="${!empty successMessage  }">
	<div class="alert alert-success alert-dismissable">
		<button type="button" class="close" data-dismiss="alert" aria-hidden="true"></button>
		<spring:message code="${successMessage }" text="${successMessage }"  />
	</div>
</c:if>
<c:if test="${!empty infoMessage  }">
	<div class="alert alert-info alert-dismissable">
		<button type="button" class="close" data-dismiss="alert" aria-hidden="true"></button>
		<spring:message code="${infoMessage }" text="${infoMessage }"  />
	</div>
</c:if>
<c:if test="${!empty warningMessage  }">
	<div class="alert alert-warning alert-dismissable">
		<button type="button" class="close" data-dismiss="alert" aria-hidden="true"></button>
		<spring:message code="${warningMessage }" text="${warningMessage }"  />
	</div>
</c:if>
<c:if test="${!empty errorMessage  }">
	<div class="alert alert-danger alert-dismissable">
		<button type="button" class="close" data-dismiss="alert" aria-hidden="true"></button>
		<spring:message code="${errorMessage }" text="${errorMessage }"  />
	</div>
</c:if>