代码

package com.zxl.flink
import org.apache.flink.streaming.api.scala.StreamExecutionEnvironment
/** * flink的流计算的WordCount */
object FlinkStreamWordCount { 
  def main(args: Array[String]): Unit = { 
    //1、初始化Flink流计算的环境
    val streamEnv: StreamExecutionEnvironment = StreamExecutionEnvironment.getExecutionEnvironment
    //修改并行度
    streamEnv.setParallelism(1) //默认所有算子的并行度为1
    //2、导入隐式转换
    import org.apache.flink.streaming.api.scala._
    //3、读取数据,读取sock流中的数据
    //val stream: DataStream[String] = streamEnv.socketTextStream("hadoop101",8888) //DataStream ==> spark 中Dstream
    //nc -lk 8888
    val stream: DataStream[String] = streamEnv.socketTextStream("localhost",8888) //DataStream ==> spark 中Dstream
    //4、转换和处理数据
    val result: DataStream[(String, Int)] = stream.flatMap(_.split(" "))
      .map((_, 1)).setParallelism(2)
      .keyBy(0)//分组算子 : 0 或者 1 代表下标。前面的DataStream[二元组] , 0代表单词 ，1代表单词出现的次数
      .sum(1).setParallelism(2) //聚会累加算子
    //5、打印结果
    result.print("结果").setParallelism(1)
    //6、启动流计算程序
    streamEnv.execute("wordcount")
  }
}

调试

发数据

在这里插入图片描述

console日志输出

结果> (scala,1)
结果> (hello,1)
结果> (zxl,1)
结果> (hello,2)
结果> (hello,3)
结果> (flink,1)
结果> (hello,4)
结果> (spark,1)
结果> (filne,1)
结果> (flink,2)

附pom文件

<?xml version="1.0" encoding="UTF-8"?>
<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>4.0.0</modelVersion>
    <groupId>com.zxl</groupId>
    <artifactId>Flink-SXT</artifactId>
    <version>1.0-SNAPSHOT</version>
<dependencies>
    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-scala_2.11</artifactId>
        <version>1.9.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-streaming-scala_2.11</artifactId>
        <version>1.9.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.hadoop</groupId>
        <artifactId>hadoop-common</artifactId>
        <version>2.7.2</version>
    </dependency>
    <dependency>
        <groupId>org.apache.hadoop</groupId>
        <artifactId>hadoop-client</artifactId>
        <version>2.7.2</version>
    </dependency>
    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-connector-kafka_2.11</artifactId>
        <version>1.9.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.kafka</groupId>
        <artifactId>kafka-clients</artifactId>
        <version>0.11.0.3</version>
    </dependency>
    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-connector-filesystem_2.11</artifactId>
        <version>1.9.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.bahir</groupId>
        <artifactId>flink-connector-redis_2.11</artifactId>
        <version>1.0</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.44</version>
    </dependency>
    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-table-planner_2.11</artifactId>
        <version>1.9.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-table-api-scala-bridge_2.11</artifactId>
        <version>1.9.1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-cep-scala_2.11</artifactId>
        <version>1.9.1</version>
    </dependency>
</dependencies>
    <build>
        <plugins>
            <!-- 该插件用于将Scala代码编译成class文件 -->
            <plugin>
                <groupId>net.alchim31.maven</groupId>
                <artifactId>scala-maven-plugin</artifactId>
                <version>3.4.6</version>
                <executions>
                    <execution>
                        <!-- 声明绑定到maven的compile阶段 -->
                        <goals>
                            <goal>testCompile</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-assembly-plugin</artifactId>
                <version>3.0.0</version>
                <configuration>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                </configuration>
                <executions>
                    <execution>
                        <id>make-assembly</id>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>