<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.7.15</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <groupId>com.flink</groupId>

    <artifactId>db-flink</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <name>db-flink</name>

    <description>db-flink</description>

    <url/>

    <licenses>

        <license/>

    </licenses>

    <developers>

        <developer/>

    </developers>

    <scm>

        <connection/>

        <developerConnection/>

        <tag/>

        <url/>

    </scm>

    <properties>

        <java.version>8</java.version>

        <scala.version>2.12</scala.version>

        <flink.version>1.13.1</flink.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

        <!-- Spring Boot Starter Web -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <dependency>

            <groupId>org.projectlombok</groupId>

            <artifactId>lombok</artifactId>

            <version>1.18.16</version>

        </dependency>

        <!--flink客户端-->

        <dependency>

            <groupId>org.apache.flink</groupId>

            <artifactId>flink-clients_${scala.version}</artifactId>

            <version>${flink.version}</version>

        </dependency>

        <!--scala版本-->

        <dependency>

            <groupId>org.apache.flink</groupId>

            <artifactId>flink-scala_${scala.version}</artifactId>

            <version>${flink.version}</version>

        </dependency>

        <!--java版本-->

        <dependency>

            <groupId>org.apache.flink</groupId>

            <artifactId>flink-java</artifactId>

            <version>${flink.version}</version>

        </dependency>

        <!--streaming的scala版本-->

        <dependency>

            <groupId>org.apache.flink</groupId>

            <artifactId>flink-streaming-scala_${scala.version}</artifactId>

            <version>${flink.version}</version>

        </dependency>

        <!--streaming的java版本-->

        <dependency>

            <groupId>org.apache.flink</groupId>

            <artifactId>flink-streaming-java_${scala.version}</artifactId>

            <version>${flink.version}</version>

        </dependency>

        <!--日志输出-->

        <dependency>

            <groupId>org.slf4j</groupId>

            <artifactId>slf4j-log4j12</artifactId>

            <version>1.7.7</version>

            <scope>runtime</scope>

        </dependency>

        <dependency>

            <groupId>log4j</groupId>

            <artifactId>log4j</artifactId>

            <version>1.2.17</version>

            <scope>runtime</scope>

        </dependency>

        <!--json依赖包-->

        <dependency>

            <groupId>com.alibaba</groupId>

            <artifactId>fastjson</artifactId>

            <version>1.2.44</version>

        </dependency>

    </dependencies>

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>

</project>

import org.apache.flink.api.common.functions.FlatMapFunction;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.datastream.DataStreamSource;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.util.Collector;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class DbFlinkApplication {
    public static void main(String[] args) throws Exception {
        SpringApplication.run(DbFlinkApplication.class, args);
        //构建执行任务环境以及任务的启动的入口, 存储全局相关的参数
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        //设置并行度
        env.setParallelism(1);
        //相同类型元素的数据流 source
        DataStreamSource<String> stringDS = env.fromElements("java,SpringBoot", "spring cloud,redis",
                                                                   "kafka,课堂");
        stringDS.print("处理前");
        DataStream<String> flatMapDS = stringDS.flatMap(new FlatMapFunction<String, String>() {
            @Override
            public void flatMap(String value, Collector<String> collector) throws Exception {
                String [] arr =  value.split(",");
                for(String str : arr){
                    collector.collect(str);
                }
            }
        });
        //输出 sink
        flatMapDS.print("处理后");
        //DataStream需要调用execute,可以取个名称
        env.execute("flat map job");
    }
//    public static void runFlinkJob(String[] args) throws Exception {
//        //构建执行任务环境以及任务的启动的入口, 存储全局相关的参数
//        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
//        //设置并行度
//        env.setParallelism(1);
//        //相同类型元素的数据流 source
//        DataStreamSource<String> stringDS = env.fromElements("java,SpringBoot", "spring cloud,redis",
//                                                                           "kafka,课堂");
//        stringDS.print("处理前");
//        DataStream<String> flatMapDS = stringDS.flatMap(new FlatMapFunction<String, String>() {
//            @Override
//            public void flatMap(String value, Collector<String> collector) throws Exception {
//                String [] arr =  value.split(",");
//                for(String str : arr){
//                    collector.collect(str);
//                }
//            }
//        });
//        //输出 sink
//        flatMapDS.print("处理后");
//
//        //DataStream需要调用execute,可以取个名称
//        env.execute("flat map job");
//    }
}

处理前> java,SpringBoot
处理后> java
处理后> SpringBoot
处理前> spring cloud,redis
处理后> spring cloud
处理后> redis
处理前> kafka,课堂
处理后> kafka
处理后> 课堂

转https://www.cnblogs.com/robots2/p/15988036.html