KeyBy自定义Bean

如果数据非常复杂，Tuple25还是不能装下的话，需要自定义bean

(keyBy也可以根据2个或者多个字段进行分组)

package org.myorg.quickstart;

public class OrderBean {
    public String province;
    public String city;
    public double money;

    public OrderBean() {
    }

    public OrderBean(String province, String city, double money) {
        this.province = province;
        this.city = city;
        this.money = money;
    }

    public static OrderBean of(String province,String city,double money){
        return new OrderBean(province,city,money);
    }

    @Override
    public String toString() {
        return "OrderBean{" +
                "province='" + province + '\'' +
                ", city='" + city + '\'' +
                ", money=" + money +
                '}';
    }
}

 

package org.myorg.quickstart.stream;

import org.apache.flink.api.common.functions.FlatMapFunction;
import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.streaming.api.datastream.DataStreamSource;
import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.util.Collector;
import org.myorg.quickstart.OrderBean;

public class StreamWordCount {
    public static void main(String[] args) throws Exception{

        final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

        DataStreamSource<String> lines = env.socketTextStream("192.166.1.33", 9999);


        SingleOutputStreamOperator<OrderBean> map = lines.map(new MapFunction<String, OrderBean>() {
            @Override
            public OrderBean map(String line) throws Exception {
                String[] str = line.split(",");
                return OrderBean.of(str[0],str[1],Double.parseDouble(str[2]));
            }
        });
        SingleOutputStreamOperator<OrderBean> sum = map.keyBy("province","city").sum("money");
        sum.print();

        env.execute("test");

    }
}