12.18 webSocket消息推送

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准备工作:

在要跳转到的页面加入js

<#--弹窗-->
<div class="modal fade" id="myModal" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-header">
                <button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
                <h4 class="modal-title" id="myModalLabel">
                    提醒
                </h4>
            </div>
            <div class="modal-body">
                你有新的订单
            </div>
            <div class="modal-footer">
                <button onclick="javascript:document.getElementById('notice').pause()" type="button" class="btn btn-default" data-dismiss="modal">关闭</button>
                <button onclick="location.reload()" type="button" class="btn btn-primary">查看新的订单</button>
            </div>
        </div>
    </div>
</div>

<#--播放音乐-->
<audio id="notice" loop="loop">
    <source src="/sell/mp3/song.mp3" type="audio/mpeg" />
</audio>

<script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.min.js"></script>
<script src="https://cdn.bootcss.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
<script>
    var websocket = null;
    if('WebSocket' in window) {
        websocket = new WebSocket('ws://sell.natapp4.cc/sell/webSocket');
    }else {
        alert('该浏览器不支持websocket!');
    }

    websocket.onopen = function (event) {
        console.log('建立连接');
    }

    websocket.onclose = function (event) {
        console.log('连接关闭');
    }

    websocket.onmessage = function (event) {
        console.log('收到消息:' + event.data)
        //弹窗提醒, 播放音乐
        $('#myModal').modal('show');

        document.getElementById('notice').play();
    }

    websocket.onerror = function () {
        alert('websocket通信发生错误！');
    }

    window.onbeforeunload = function () {
        websocket.close();
    }

</script>

　　

　　

1.引入依赖

 <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-websocket</artifactId>
        </dependency>
	</dependencies>

　　2.创建配置文件

@Component
public class WebSocketConfig {

    @Bean
    public ServerEndpointExporter serverEndpointExporter() {
        return new ServerEndpointExporter();
    }
}

　　3.在service包下加入执行的类文件

@Component
@ServerEndpoint("/webSocket")
@Slf4j
public class WebSocket {

    private Session session;

    private static CopyOnWriteArraySet<WebSocket> webSocketSet = new CopyOnWriteArraySet<>();

    @OnOpen
    public void onOpen(Session session) {
        this.session = session;
        webSocketSet.add(this);
        log.info("【websocket消息】有新的连接, 总数:{}", webSocketSet.size());
    }

    @OnClose
    public void onClose() {
        webSocketSet.remove(this);
        log.info("【websocket消息】连接断开, 总数:{}", webSocketSet.size());
    }

    @OnMessage
    public void onMessage(String message) {
        log.info("【websocket消息】收到客户端发来的消息:{}", message);
    }

    public void sendMessage(String message) {
        for (WebSocket webSocket: webSocketSet) {
            log.info("【websocket消息】广播消息, message={}", message);
            try {
                webSocket.session.getBasicRemote().sendText(message);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

}

　　在创建订单扣库存后执行方法

*
 * Created by 廖师兄
 * 2017-06-11 18:43
 */
@Service
@Slf4j
public class OrderServiceImpl implements OrderService {

    @Autowired
    private ProductService productService;

    @Autowired
    private OrderDetailRepository orderDetailRepository;

    @Autowired
    private OrderMasterRepository orderMasterRepository;

    @Autowired
    private PayService payService;

    @Autowired
    private PushMessageService pushMessageService;

    @Autowired
    private WebSocket webSocket;

    @Override
    @Transactional
    public OrderDTO create(OrderDTO orderDTO) {

        String orderId = KeyUtil.genUniqueKey();
        BigDecimal orderAmount = new BigDecimal(BigInteger.ZERO);

//        List<CartDTO> cartDTOList = new ArrayList<>();

        //1. 查询商品（数量, 价格）
        for (OrderDetail orderDetail: orderDTO.getOrderDetailList()) {
            ProductInfo productInfo =  productService.findOne(orderDetail.getProductId());
            if (productInfo == null) {
                throw new SellException(ResultEnum.PRODUCT_NOT_EXIST);
            }

            //2. 计算订单总价
            orderAmount = productInfo.getProductPrice()
                    .multiply(new BigDecimal(orderDetail.getProductQuantity()))
                    .add(orderAmount);

            //订单详情入库
            orderDetail.setDetailId(KeyUtil.genUniqueKey());
            orderDetail.setOrderId(orderId);
            BeanUtils.copyProperties(productInfo, orderDetail);
            orderDetailRepository.save(orderDetail);

//            CartDTO cartDTO = new CartDTO(orderDetail.getProductId(), orderDetail.getProductQuantity());
//            cartDTOList.add(cartDTO);
        }

        //3. 写入订单数据库（orderMaster和orderDetail）
        OrderMaster orderMaster = new OrderMaster();
        orderDTO.setOrderId(orderId);
        BeanUtils.copyProperties(orderDTO, orderMaster);
        orderMaster.setOrderAmount(orderAmount);
        orderMaster.setOrderStatus(OrderStatusEnum.NEW.getCode());
        orderMaster.setPayStatus(PayStatusEnum.WAIT.getCode());
        orderMasterRepository.save(orderMaster);

        //4. 扣库存
        List<CartDTO> cartDTOList = orderDTO.getOrderDetailList().stream().map(e ->
                new CartDTO(e.getProductId(), e.getProductQuantity())
        ).collect(Collectors.toList());
        productService.decreaseStock(cartDTOList);

        //发送websocket消息
        webSocket.sendMessage(orderDTO.getOrderId());

        return orderDTO;
    }
}

　　

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