统计每个商铺的平均客单价 flink的代码

假设数据源是一个流式的订单数据流，包含以下字段：商铺ID（shopId）、订单金额（orderAmount）、订单时间（orderTime）。

可以使用Flink的DataStream API进行实现，代码如下：

import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.api.java.functions.KeySelector;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.windowing.time.Time;

public class ShopAvgOrderAmount {
    
    public static void main(String[] args) throws Exception {
        
        // 创建执行环境
        final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

        // 读取订单数据源
        DataStream<Order> orders = env.addSource(new OrderSource());

        // 按商铺ID分组
        DataStream<ShopOrder> shopOrders = orders
            .keyBy(new KeySelector<Order, String>() {
                @Override
                public String getKey(Order order) throws Exception {
                    return order.getShopId();
                }
            })
            // 计算每个商铺的订单总金额和订单数量
            .timeWindow(Time.minutes(10))
            .map(new MapFunction<Order, ShopOrder>() {
                @Override
                public ShopOrder map(Order order) throws Exception {
                    return new ShopOrder(order.getShopId(), order.getOrderAmount(), 1);
                }
            })
            .reduce(new ReduceFunction<ShopOrder>() {
                @Override
                public ShopOrder reduce(ShopOrder so1, ShopOrder so2) throws Exception {
                    return new ShopOrder(so1.getShopId(), so1.getOrderAmount() + so2.getOrderAmount(), so1.getOrderCount() + so2.getOrderCount());
                }
            });

        // 计算每个商铺的平均客单价
        DataStream<ShopAvgOrderAmount> shopAvgOrderAmounts = shopOrders
            .map(new MapFunction<ShopOrder, ShopAvgOrderAmount>() {
                @Override
                public ShopAvgOrderAmount map(ShopOrder so) throws Exception {
                    return new ShopAvgOrderAmount(so.getShopId(), so.getOrderAmount() / so.getOrderCount());
                }
            });

        // 打印结果
        shopAvgOrderAmounts.print();

        // 执行任务
        env.execute("ShopAvgOrderAmount");
    }

    // 订单实体类
    public static class Order {
        private String shopId;
        private double orderAmount;
        private long orderTime;

        public Order() {}

        public Order(String shopId, double orderAmount, long orderTime) {
            this.shopId = shopId;
            this.orderAmount = orderAmount;
            this.orderTime = orderTime;
        }

        public String getShopId() {
            return shopId;
        }

        public void setShopId(String shopId) {
            this.shopId = shopId;
        }

        public double getOrderAmount() {
            return orderAmount;
        }

        public void setOrderAmount(double orderAmount) {
            this.orderAmount = orderAmount;
        }

        public long getOrderTime() {
            return orderTime;
        }

        public void setOrderTime(long orderTime) {
            this.orderTime = orderTime;
        }
    }

    // 每个商铺的订单统计实体类
    public static class ShopOrder {
        private String shopId;
        private double orderAmount;
        private int orderCount;

        public ShopOrder() {}

        public ShopOrder(String shopId, double orderAmount, int orderCount) {
            this.shopId = shopId;
            this.orderAmount = orderAmount;
            this.orderCount = orderCount;
        }

        public String getShopId() {
            return shopId;
        }

        public void setShopId(String shopId) {
            this.shopId = shopId;
        }

        public double getOrderAmount() {
            return orderAmount;
        }

        public void setOrderAmount(double orderAmount) {
            this.orderAmount = orderAmount;
        }

        public int getOrderCount() {
            return orderCount;
        }

        public void setOrderCount(int orderCount) {
            this.orderCount = orderCount;
        }
    }

    // 每个商铺的平均客单价实体类
    public static class ShopAvgOrderAmount {
        private String shopId;
        private double avgOrderAmount;

        public ShopAvgOrderAmount() {}

        public ShopAvgOrderAmount(String shopId, double avgOrderAmount) {
            this.shopId = shopId;
            this.avgOrderAmount = avgOrderAmount;
        }

        public String getShopId() {
            return shopId;
        }

        public void setShopId(String shopId) {
            this.shopId = shopId;
        }

        public double getAvgOrderAmount() {
            return avgOrderAmount;
        }

        public void setAvgOrderAmount(double avgOrderAmount) {
            this.avgOrderAmount = avgOrderAmount;
        }
    }
}

该代码实现了按商铺ID对订单数据流进行分组，然后计算每个商铺的订单总金额和订单数量，并最终计算每个商铺的平均客单价。其中，需要自定义三个实体类：订单实体类（Order）、每个商铺的订单统计实体类（ShopOrder）和每个商铺的平均客单价实体类（ShopAvgOrderAmount）。