Java微服务项目：家居商城，使用Redisson+RabbitMQ解决订单库存存在问题的Java代码流程

以下是Java代码示例，用于演示家居商城微服务项目中使用Redisson和RabbitMQ解决订单库存问题的流程：

1. 订单服务中创建订单并发送消息到RabbitMQ

// 创建订单
Order order = new Order();
order.setOrderId("123456");
order.setUserId("10001");
order.setProductId("1001");
order.setOrderAmount(1);
order.setOrderStatus(0);

// 将订单信息写入数据库

// 发送消息到RabbitMQ
RabbitMQService rabbitMQService = new RabbitMQService();
rabbitMQService.sendOrderMessage(order);

2. RabbitMQ服务中接收订单消息并发送库存消息到RabbitMQ

public class RabbitMQService {
    public void sendOrderMessage(Order order) {
        // 将订单信息发送到RabbitMQ
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        try (Connection connection = factory.newConnection();
             Channel channel = connection.createChannel()) {
            channel.queueDeclare("order_queue", false, false, false, null);
            channel.basicPublish("", "order_queue", null, order.toString().getBytes());
        } catch (IOException | TimeoutException e) {
            e.printStackTrace();
        }

        // 发送库存消息到RabbitMQ
        sendStockMessage(order.getProductId(), order.getOrderAmount());
    }

    public void sendStockMessage(String productId, int orderAmount) {
        // 将库存信息发送到RabbitMQ
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        try (Connection connection = factory.newConnection();
             Channel channel = connection.createChannel()) {
            channel.queueDeclare("stock_queue", false, false, false, null);
            channel.basicPublish("", "stock_queue", null, (productId + ":" + orderAmount).getBytes());
        } catch (IOException | TimeoutException e) {
            e.printStackTrace();
        }
    }
}

3. 库存服务中接收库存消息并更新库存信息

public class StockService {
    private RedissonClient redissonClient;

    public StockService(RedissonClient redissonClient) {
        this.redissonClient = redissonClient;
    }

    public void receiveStockMessage() {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        try {
            Connection connection = factory.newConnection();
            Channel channel = connection.createChannel();
            channel.queueDeclare("stock_queue", false, false, false, null);
            channel.basicConsume("stock_queue", true, (consumerTag, message) -> {
                String[] stockInfo = new String(message.getBody(), "UTF-8").split(":");
                String productId = stockInfo[0];
                int stockAmount = Integer.parseInt(stockInfo[1]);

                // 更新库存
                RLock lock = redissonClient.getLock(productId);
                lock.lock();
                try {
                    int currentStock = getCurrentStock(productId);
                    if (currentStock >= stockAmount) {
                        updateStock(productId, currentStock - stockAmount);
                    } else {
                        sendOrderFailMessage(productId);
                    }
                } finally {
                    lock.unlock();
                }
            }, consumerTag -> {
            });
        } catch (IOException | TimeoutException e) {
            e.printStackTrace();
        }
    }

    public int getCurrentStock(String productId) {
        // 获取当前库存数量
        // ...
    }

    public void updateStock(String productId, int newStock) {
        // 更新库存数量
        // ...
        sendOrderSuccessMessage(productId);
    }

    public void sendOrderSuccessMessage(String productId) {
        // 向订单服务发送消息，通知订单处理完成
        // ...
    }

    public void sendOrderFailMessage(String productId) {
        // 向订单服务发送消息，通知订单处理失败
        // ...
    }
}

在以上示例代码中，订单服务和库存服务通过RabbitMQ进行异步通信，库存服务使用Redisson实现分布式锁来保证库存修改的互斥性。同时，库存服务的更新操作是基于当前库存数量进行的，并且在库存不足时会发送消息通知订单服务处理失败。