spring自定義泛型類中AutoWired注入為null

我在實(shí)際開發(fā)中遇到有一段公共的代碼，幾個(gè)方法都需要掉，但如果單獨(dú)拉出來寫一個(gè)方法的話，入?yún)⒂植煌?，所以想到了用泛型?/p>

比如這是一段公共代碼：

//保存訂單信息,需要多個(gè)方法調(diào)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);
}

將這段代碼提煉成泛型類：

@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;
	}
}

最開始我是這么調(diào)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為null。（在controller層中注入service接口，在service層中注入orderService是有值的），嘗試可很多解決辦法，最后發(fā)現(xiàn)，原來spring自定義的類實(shí)例化時(shí)也需要用注入的方式，不能用new，否則脫離了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);
}