基于scala 2.12
flink 1.14

pom.xml

<?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>2.7.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.28</version>
        </dependency>


        <dependency>
            <groupId>org.scala-lang</groupId>
            <artifactId>scala-library</artifactId>
            <version>2.12.7</version>
        </dependency>
        <dependency>
            <groupId>org.scala-lang</groupId>
            <artifactId>scala-compiler</artifactId>
            <version>2.12.7</version>
        </dependency>



        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-table-api-scala-bridge_2.12</artifactId>
            <version>1.14.5</version>
        </dependency>
        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-table-planner_2.12</artifactId>
            <version>1.14.5</version>
        </dependency>

        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-connector-jdbc_2.12</artifactId>
            <version>1.14.5</version>
        </dependency>
        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-table-common</artifactId>
            <version>1.14.5</version>
        </dependency>
        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-clients_2.12</artifactId>
            <version>1.14.5</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.scala-tools</groupId>
                <artifactId>maven-scala-plugin</artifactId>
                <version>2.15.2</version>
                <executions>
                    <execution>
                        <id>scala-compile-first</id>
                        <goals>
                            <goal>compile</goal>
                        </goals>
                        <configuration>
                            <includes>
                                <include>**/*.scala</include>
                            </includes>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>

lib添加scala sdk

目录结构

@RestController
public class flinkController {

    @GetMapping("/test")
    public void test(){
        Test.tableApi();
    }

    @GetMapping("/test2")
    public void test2(){
        //Test2.dataSetApi();
        Test2.dataStreamApi();
    }
}

flink代码

import org.apache.flink.streaming.api.scala.StreamExecutionEnvironment
import org.apache.flink.table.api.bridge.scala.StreamTableEnvironment

object Test {
  private val host_url = "127.0.0.1"
  private val port = 3328
  private val db_name = "test"
  private val table_input = "salary_table"
  private val table_output = "salary_count"
  private val user = "root"
  private val password = "root"

  def tableApi():Unit={
    val env = StreamExecutionEnvironment.getExecutionEnvironment
    env.setParallelism(1)
    val tableEnv = StreamTableEnvironment.create(env)

    tableEnv.executeSql(
      s"""
        |create table mysqlInput (
        | name string,
        | salary double
        | ) with (
        |   'connector.type' = 'jdbc',
        |   'connector.url' = 'jdbc:mysql://$host_url:$port/$db_name',
        |   'connector.table' = '$table_input',
        |   'connector.driver' = 'com.mysql.jdbc.Driver',
        |   'connector.username' = '$user',
        |   'connector.password' = '$password'
        | )
      """.stripMargin)

    tableEnv.executeSql(
      s"""
        |create table mysqlOutput (
        | salary double,
        | cnt bigint not null
        | ) with (
        |   'connector.type' = 'jdbc',
        |   'connector.url' = 'jdbc:mysql://$host_url:$port/$db_name',
        |   'connector.table' = '$table_output',
        |   'connector.driver' = 'com.mysql.jdbc.Driver',
        |   'connector.username' = '$user',
        |   'connector.password' = '$password'
        | )
      """.stripMargin)


    val rltTable = tableEnv.sqlQuery(
      """
        |select salary,count(1) as cnt
        |from mysqlInput
        |group by salary
      """.stripMargin)

    rltTable.executeInsert("mysqlOutput")
  }
}

import org.apache.flink.api.scala._
import org.apache.flink.streaming.api.scala.StreamExecutionEnvironment
import org.apache.flink.streaming.api.windowing.assigners.TumblingProcessingTimeWindows
import org.apache.flink.streaming.api.windowing.time.Time


object Test2 {

  def dataSetApi(): Unit = {
    val env = ExecutionEnvironment.getExecutionEnvironment;
    val dataSet = env.readTextFile("C:\\demo.txt");
    val result = dataSet
      .flatMap(_.split(" "))
      .map((_,1))
      .groupBy(0)
      .sum(1);
    result.print();
  }

  def dataStreamApi(): Unit = {
    val env = StreamExecutionEnvironment.getExecutionEnvironment;
    val dataStream = env.socketTextStream("url",28062);
    val rlt = dataStream
      .flatMap(_.split(" "))
      .filter(_.nonEmpty)
      .map((_,1))
      .keyBy(_._1)
      .window(TumblingProcessingTimeWindows.of(Time.seconds(10)))
      .sum(1);
    rlt.print();
    env.execute();
  }