从零开始搭建flink流式计算项目-1项目创建

项目搭建

我这里使用的是 jdk17, flink版本 1.18.1

1. 新建maven项目 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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>cn.xyz2022</groupId>
    <artifactId>flink-demo1</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>

        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <flink.version>1.18.1</flink.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-java</artifactId>
            <version>${flink.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-core</artifactId>
            <version>${flink.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-streaming-java</artifactId>
            <version>${flink.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-clients</artifactId>
            <version>${flink.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.flink</groupId>
            <artifactId>flink-table-common</artifactId>
            <version>${flink.version}</version>
        </dependency>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>2.0.12</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>2.0.12</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.30</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <version>3.2.4</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                        <configuration>
                            <artifactSet>
                                <excludes>
                                    <exclude>com.google.code.findbugs:jsr305</exclude>
                                    <exclude>org.slf4j:*</exclude>
                                    <exclude>log4j:*</exclude>
                                </excludes>
                            </artifactSet>
                            <filters>
                                <filter>
                                    <!-- Do not copy the signatures in the META-INF folder.
                                    Otherwise, this might cause SecurityExceptions when using the JAR. -->
                                    <artifact>*:*</artifact>
                                    <excludes>
                                        <exclude>META-INF/*.SF</exclude>
                                        <exclude>META-INF/*.DSA</exclude>
                                        <exclude>META-INF/*.RSA</exclude>
                                    </excludes>
                                </filter>
                            </filters>
                            <transformers combine.children="append">
                                <transformer
                                        implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer">
                                </transformer>
                            </transformers>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

2. 在/resources目录下配置 log4j

log4j.rootLogger=debug, stdout, R
log4j.logger.org=error
log4j.logger.cn.xyz2022=debug

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d [%5p] [%20c] [%10t] %m%n


log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R.File=./log/flink.log
log4j.appender.R.MaxFileSize=10MB
# Keep one backup file
log4j.appender.R.MaxBackupIndex=5
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%d [%5p] [%20c] [%10t] %m%n

3. 定义job作为入口

package cn.xyz2022;

import lombok.extern.slf4j.Slf4j;
import org.apache.flink.streaming.api.datastream.DataStreamSource;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.source.SourceFunction;

@Slf4j
public class FlinkStreamJob {
    public static void main(String[] args) throws Exception {

        StreamExecutionEnvironment environment = StreamExecutionEnvironment.getExecutionEnvironment();
        environment.setParallelism(1);

        DataStreamSource<Long> streamSource = environment.addSource(new SourceFunction<Long>() {
            private boolean running = true;

            /**
             * 这里定义一个每秒输出当前毫秒数的source
             */
            @Override
            public void run(SourceContext<Long> sourceContext) throws Exception {
                while (running) {
                    long ts = System.currentTimeMillis();
                    ts = ts - ts % 1000;
                    sourceContext.collect(ts);
                    Thread.sleep(1000 - ts % 1000);
                }
            }

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

        streamSource.print("out >>");
        environment.execute();

    }
}

输出结果

out >>> 1709635317000
out >>> 1709635318000
out >>> 1709635319000
out >>> 1709635320000
out >>> 1709635321000
out >>> 1709635322000
out >>> 1709635323000
out >>> 1709635324000
out >>> 1709635325000
out >>> 1709635326000
out >>> 1709635327000
out >>> 1709635328000
out >>> 1709635329000
out >>> 1709635330000
out >>> 1709635331000
out >>> 1709635332000
out >>> 1709635333000
out >>> 1709635334000
out >>> 1709635335000
out >>> 1709635336000
out >>> 1709635337000
out >>> 1709635338000
out >>> 1709635339000