学习Apache Flink的第一个示例

示例

• 使用Idea创建Maven项目
• 添加Flink依赖

	<!- 根据自己的需求添加依赖这里仅需要以下两个，修改对应的scala版本，以及所想用的flink版本->
	<dependency>
      <groupId>org.apache.flink</groupId>
      <artifactId>flink-scala_2.11</artifactId>
      <version>1.7.2</version>
    </dependency>
    <dependency>
      <groupId>org.apache.flink</groupId>
      <artifactId>flink-streaming-scala_2.11</artifactId>
      <version>1.7.2</version>
    </dependency>

• 创建scala Object

import org.apache.flink.streaming.api.scala.{
    
    DataStream, StreamExecutionEnvironment}
import org.apache.flink.streaming.api.scala._

object FlinkTest {
    
    
  def main(args: Array[String]): Unit = {
    
    
    //创建flink环境
    val env: StreamExecutionEnvironment = StreamExecutionEnvironment.getExecutionEnvironment
    //设置并行度
    env.setParallelism(4)
    //创建流
    val stream: DataStream[String] = env.fromCollection(List(
      "hello java",
      "hello flink",
      "hello java",
      "hello flink"

    ))
    stream.print()
    env.execute("demo")
  }

}

• 输出结果

2> hello flink
4> hello flink
3> hello java
1> hello java