Flink与kafka集成开发

8.Flink与Kafka集成开发

8.1.核心代码

KafkaFlinkMySQL

 

package com.djt.flink.news;

import java.util.Properties;

import org.apache.flink.api.common.functions.FlatMapFunction;

import org.apache.flink.api.common.serialization.SimpleStringSchema;

import org.apache.flink.api.java.tuple.Tuple2;

import org.apache.flink.streaming.api.datastream.DataStream;

import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;

import org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer;

import org.apache.flink.util.Collector;

public class KafkaFlinkMySQL {

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

             //获取Flink的运行环境

        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

 

        //kafka配置参数

        Properties properties = new Properties();

        properties.setProperty("bootstrap.servers", "hadoop3-1:9092,hadoop3-2:9092,hadoop3-3:9092");

        properties.setProperty("group.id", "sogoulogs");

 

        //kafka消费者

        FlinkKafkaConsumer<String> myConsumer = new FlinkKafkaConsumer<>("sogoulogs", new SimpleStringSchema(), properties);

        DataStream<String> stream = env.addSource(myConsumer);

       

        //对数据进行过滤

        DataStream<String> filter = stream.filter((value) -> value.split(",").length==6);

       

        DataStream<Tuple2<String, Integer>> newsCounts = filter.flatMap(new LineSplitter()).keyBy(0).sum(1);

        //自定义MySQL sink

        newsCounts.addSink(new MySQLSink());

       

        DataStream<Tuple2<String, Integer>> periodCounts = filter.flatMap(new LineSplitter2()).keyBy(0).sum(1);

        //自定义MySQL sink

        periodCounts.addSink(new MySQLSink2());

 

        // 执行flink 程序

        env.execute("FlinkMySQL");

    }

   

    public static final class LineSplitter implements FlatMapFunction<String, Tuple2<String, Integer>> {

                   private static final long serialVersionUID = 1L;

 

                   public void flatMap(String value, Collector<Tuple2<String, Integer>> out) {

                            String[] tokens = value.toLowerCase().split(",");

                            out.collect(new Tuple2<String, Integer>(tokens[2], 1));

                   }

         }

   

    public static final class LineSplitter2 implements FlatMapFunction<String, Tuple2<String, Integer>> {

                   private static final long serialVersionUID = 1L;

 

                   public void flatMap(String value, Collector<Tuple2<String, Integer>> out) {

                            String[] tokens = value.toLowerCase().split(",");

                            out.collect(new Tuple2<String, Integer>(tokens[0], 1));

                   }

         }

 

}

 

 

8.2启动集群服务

（1）启动Zookeeper集群

runRemoteCmd.sh "/home/hadoop/app/zookeeper/bin/zkServer.sh stop" all

 

（2）启动kafka集群

 bin/kafka-server-start.sh config/server.properties

 

（3）打开kafka生产者

bin/kafka-console-producer.sh --broker-list localhost:9092 --topic sogoulogs

8.3启动flink 应用

KafkaFlinkMySQL