flink统计次数

java:

  public static void main(String[] args) throws Exception{
        //1. 创建流式处理的执行环境
//        StreamExecutionEnvironment env = StreamExecutionEnvironment.createLocalEnvironment();
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        // 参数中提取主机名和端口号
        ParameterTool parameterTool = ParameterTool.fromArgs(args);
        String host = parameterTool.get("host");
        int port = parameterTool.getInt("port");
        //2. 读取文本流
        DataStreamSource<String> stringDataStreamSource = env.socketTextStream(host, port);
        SingleOutputStreamOperator<String> filter = stringDataStreamSource.filter(new FilterFunction<String>() {
            @Override
            public boolean filter(String s) throws Exception {
                return false;
            }
        });
        // 3. 转换计算
        SingleOutputStreamOperator<Tuple2<String, Long>> returns =
                stringDataStreamSource.flatMap((String line, Collector<Tuple2<String, Long>> out) -> {
            String[] words = line.split(" ");
            for (String v : words) {
                out.collect(Tuple2.of(v, 1L));
            }
        }).returns(Types.TUPLE(Types.STRING, Types.LONG));
        // 4.分组操作
        KeyedStream<Tuple2<String, Long>, String> tuple2StringKeyedStream = returns.keyBy(data -> data.f0);
        // 5.求和
        SingleOutputStreamOperator<Tuple2<String, Long>> sum = tuple2StringKeyedStream.sum(1);
        // 6. 打印
        sum.print();
        // 7.启动执行
        env.execute();
 
        // 启动之前 需要 一个linux 服务器
        // 启动linux  执行 nc -lk 7777
        // 24 行的IP 和 端口 要对应
 
        // windows 下载 netcat
        // 执行 nc -l -p 7777
    }

pom:

<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0modelVersion>
 
    <groupId>com.flinkgroupId>
    <artifactId>flik-demoartifactId>
    <version>1.0-SNAPSHOTversion>
 
    <properties>
        <flink.version>1.13.0flink.version>
        <java.version>1.8java.version>
        <scala.binary.version>2.12scala.binary.version>
        <slf4j.version>1.7.30slf4j.version>
    properties>
 
    <dependencies>
        
        <dependency>
            <groupId>org.apache.flinkgroupId>
            <artifactId>flink-javaartifactId>
            <version>${flink.version}version>
        dependency>
 
        <dependency>
            <groupId>org.apache.flinkgroupId>
            <artifactId>flink-streaming-java_${scala.binary.version}artifactId>
            <version>${flink.version}version>
        dependency>
        
        <dependency>
            <groupId>org.apache.flinkgroupId>
            <artifactId>flink-clients_${scala.binary.version}artifactId>
            <version>${flink.version}version>
        dependency>
        
        <dependency>
            <groupId>org.slf4jgroupId>
            <artifactId>slf4j-apiartifactId>
            <version>${slf4j.version}version>
        dependency>
 
        <dependency>
            <groupId>org.slf4jgroupId>
            <artifactId>slf4j-log4j12artifactId>
            <version>${slf4j.version}version>
        dependency>
 
        <dependency>
            <groupId>org.apache.logging.log4jgroupId>
            <artifactId>log4j-to-slf4jartifactId>
            <version>2.14.0version>
        dependency>
 
    dependencies>
project>

注意：必须先启动 端口，才能启动程序

启动之前 需要 一个linux 服务器
启动linux  执行 nc -lk 7777
24 行的IP 和 端口 要对应

windows 下载 netcat
执行 nc -l -p 7777