windows环境Java操作Flink入门指南

所需jar包

    org.apache.flink
    flink-java
    1.11.1


    org.apache.flink
    flink-streaming-java_2.11
    1.11.1


    org.apache.flink
    flink-clients_2.11
    1.11.1



    org.apache.flink
    flink-table-planner-blink_2.11
    1.11.1



    org.apache.flink
    flink-connector-kafka_2.11
    1.11.1


    org.apache.flink
    flink-json
    1.11.0


    org.apache.flink
    flink-runtime-web_2.11
    1.11.1

通过windows命令可以进行测试

nc -l -p 9999

找不到命令的话需要单独安装 netcat 1.11 for Win32/Win64

在安装根目录执行此命令，即可进行单词数量统计

java代码

package com.flink.demo;

import org.apache.flink.api.common.functions.FlatMapFunction;
import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.api.java.tuple.Tuple2;
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;

public class FlinkDemo {

    public static void main(String[] args) {
        StreamExecutionEnvironment  env = StreamExecutionEnvironment.getExecutionEnvironment();
        DataStreamSource text = env.socketTextStream("localhost", 9999, "n");
        SingleOutputStreamOperator flatMap = text.flatMap(new FlatMapFunction() {
            @Override
            public void flatMap(String calue, Collector collector) throws Exception {
                for (String s : calue.split(" ")) {
                    collector.collect(s);
                }
            }
        });
        SingleOutputStreamOperator> map = flatMap.map(new MapFunction>() {
            @Override
            public Tuple2 map(String value) throws Exception {
                return Tuple2.of(value, 1);
            }
        });

        SingleOutputStreamOperator> sum = map.keyBy(0).sum(1);
        sum.print();
        try {
            env.execute("socket word count");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

启动程序后,在命令行输入

控制台打印