我在实际开发中遇到有一段公共的代码,几个方法都需要掉,但如果单独拉出来写一个方法的话,入参又不同,所以想到了用泛型。
比如这是一段公共代码:
//保存订单信息,需要多个方法调用
OrderFilterRequest orderFilterRequest = new OrderFilterRequest();
btOrderFilterRequest.setUserId("1");
btOrderFilterRequest.setStatus("0");
List<Order> orderResultList = orderService.findOrders(orderFilterRequest);
Order result = null;
if(CollectionUtils.isEmpty(orderResultList )){
Order order = CopierUtils.convert(request, Order.class);
order.setRealName(customer.getRealName());
order.setIdcardNo(customer.getIdcardNo());
order.setOrderNo("order" + DateUtil.getYMDHMS());
order.setStatus("0");
order.setCreateTime(new Date());
order.setUpdateTime(new Date());
order.setUserId("1");
result = orderService.createOrder(Order);
}else{
Order orderResult = orderResultList.get(0);
CopierUtils.copy(request, orderResult);
orderResult.setUpdateTime(new Date());
result = orderService.updateOrder(btOrderResult);
}
将这段代码提炼成泛型类:
@Transactional(readOnly = true)
@Component
public class OrderRequest<T>{
@Autowired
private OrderService orderService;
@Transactional
public Order orderInfoSave(T request) {
OrderFilterRequest orderFilterRequest = new OrderFilterRequest();
btOrderFilterRequest.setUserId("1");
btOrderFilterRequest.setStatus("0");
List<Order> orderResultList = orderService.findOrders(orderFilterRequest);
Order result = null;
if(CollectionUtils.isEmpty(orderResultList )){
Order order = CopierUtils.convert(request, Order.class);
order.setRealName(customer.getRealName());
order.setIdcardNo(customer.getIdcardNo());
order.setOrderNo("order" + DateUtil.getYMDHMS());
order.setStatus("0");
order.setCreateTime(new Date());
order.setUpdateTime(new Date());
order.setUserId("1");
result = orderService.createOrder(Order);
}else{
Order orderResult = orderResultList.get(0);
CopierUtils.copy(request, orderResult);
orderResult.setUpdateTime(new Date());
result = orderService.updateOrder(btOrderResult);
}
return result;
}
}
最开始我是这么调用的:
public void method1(Request1 request ) {
OrderRequest<Request1> orderCreateRequest = new OrderRequest<Request1>();
Order result = OrderCreateRequest.orderInfoSave(request);
}
public void method2(Request2 request ) {
OrderRequest<Request2> orderCreateRequest = new OrderRequest<Request2>();
Order result = OrderCreateRequest.orderInfoSave(request);
}
但是OrderRequest中orderService为null。(在controller层中注入service接口,在service层中注入orderService是有值的),尝试可很多解决办法,最后发现,原来spring自定义的类实例化时也需要用注入的方式,不能用new,否则脱离了spring的管理。改成如下方式就可以了:
@Autowired
private OrderRequest<Request1> request1;
@Autowired
private OrderRequest<Request2> request2;
public void method1(Request1 request ) {
Order result = request1.orderInfoSave(request);
}
public void method2(Request2 request ) {
Order result = request2.orderInfoSave(request);
}
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