springboot集成flink步骤，及demo

springboot集成flink，写代码学习flink，集成步骤如下：

1、maven引入依赖：

   org.apache.flink
   flink-java
   ${flink.version}


   org.apache.flink
   flink-streaming-java_${scala.binary.version}
   ${flink.version}


   org.apache.flink
   flink-clients_2.11
   ${flink.version}

2、配置文件配置相关参数：

# Flink配置
flink.jobmanager.host=localhost
flink.jobmanager.port=6123
flink.parallelism=1

3、写测试类，代码如下 ：

import org.apache.flink.api.common.typeinfo.Types;
import org.apache.flink.api.java.tuple.Tuple;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.datastream.KeyedStream;
import org.apache.flink.streaming.api.datastream.WindowedStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.source.SourceFunction;
import org.apache.flink.streaming.api.functions.timestamps.AscendingTimestampExtractor;
import org.apache.flink.streaming.api.watermark.Watermark;
import org.apache.flink.streaming.api.windowing.time.Time;
import org.apache.flink.streaming.api.windowing.windows.TimeWindow;
import org.apache.flink.streaming.api.windowing.assigners.TumblingEventTimeWindows;

import java.util.Random;



public class Demo {

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

        // 创建执行环境
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

        // 创建数据源
        DataStream stream = env.addSource(new SourceFunction() {
            private volatile boolean isRunning = true;

            @Override
            public void run(SourceContext ctx) throws Exception {
                Random random = new Random();
                while (isRunning) {
                    Thread.sleep(10);
                    long timestamp = System.currentTimeMillis() - random.nextInt(5) * 1000;
                    String str = "key" + random.nextInt(10) + "," + timestamp;
                    ctx.collectWithTimestamp(str, timestamp);
                    ctx.emitWatermark(new Watermark(timestamp));
                }
            }

            @Override
            public void cancel() {
                isRunning = false;
            }
        });


        // 将数据源解析成二元组（key, timestamp）
        DataStream> parsedStream = stream.map((String line)  -> {
            String[] parts = line.split(",");
            return new Tuple2<>((String)parts[0], Long.parseLong(parts[1]));
        }).returns(Types.TUPLE(Types.STRING, Types.LONG));

        // 设置事件时间和水位线
        DataStream> withTimestampsAndWatermarks = parsedStream
                .assignTimestampsAndWatermarks(new AscendingTimestampExtractor>() {
                    @Override
                    public long extractAscendingTimestamp(Tuple2 element) {
                        return element.f1;
                    }
                });

        // 按键值进行分组
        KeyedStream, Tuple> keyedStream = withTimestampsAndWatermarks.keyBy(0);

        // 每5秒钟统计最近一分钟的数据（使用滚动时间窗口）
        WindowedStream, Tuple, TimeWindow> windowedStream = keyedStream.window(TumblingEventTimeWindows.of(Time.minutes(1)));

        // 进行聚合计算
        DataStream> resultStream = windowedStream
                .reduce((Tuple2 v1, Tuple2 v2) -> new Tuple2<>(v1.f0, v1.f1 + v2.f1));

        // 输出结果
        resultStream.print();

        // 启动作业
        env.execute("Demo");
    }
}