java Flink 1.11 demo

最新推荐文章于 2025-10-07 15:44:12 发布

原创最新推荐文章于 2025-10-07 15:44:12 发布 · 555 阅读

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其实我挺排斥用java写大数据代码的，但是没办法公司用java写。不过Java写也是有道理的嘛，所以就从Scala转到了Java。

依赖

<dependency>
    <groupId>org.apache.flink</groupId>
    <artifactId>flink-java</artifactId>
    <version>${flink.version}</version>
<!--            <scope>provided</scope>-->
</dependency>
<!--没有会报错：No ExecutorFactory found to execute the application.-->
<dependency>
    <groupId>org.apache.flink</groupId>
    <artifactId>flink-clients_${scala.binary.version}</artifactId>
    <version>${flink.version}</version>
</dependency>
<dependency>
    <groupId>org.apache.flink</groupId>
    <artifactId>flink-streaming-java_${scala.binary.version}</artifactId>
    <version>${flink.version}</version>
<!--            <scope>provided</scope>-->
</dependency>
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-log4j12</artifactId>
    <version>1.7.7</version>
<!--            <scope>runtime</scope>-->
</dependency>

demo

很简单的一个读取元素然后对每个元素乘以3的程序。重在走通java写flink的流程。

public class FirstDemo {
    public static void main(String[] args) {
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        env.fromElements(1,2,3,4,5)
                .map(re -> re * 3)
                .print();
        try {
            env.execute();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}