01 引言

源码地址,一键下载可用：https://gitee.com/shawsongyue/aurora.git
模块：aurora_flink
主类：FlinkSocketSourceJob（socket请求）

02 简介概述

1.Source 是Flink程序从中读取其输入数据的地方。你可以用 StreamExecutionEnvironment.addSource(sourceFunction) 将一个 source 关联到你的程序。2.Flink 自带了许多预先实现的 source functions，不过你仍然可以通过实现 SourceFunction 接口编写自定义的非并行 source。3.也可以通过实现 ParallelSourceFunction 接口或者继承 RichParallelSourceFunction 类编写自定义的并行 sources。

03 基于socket套接字读取数据

3.1 从套接字读取。元素可以由分隔符分隔。

3.2 windows安装netcat工具

（1）下载netcat工具

下载地址：https://eternallybored.org/misc/netcat/

（2）安装部署

注意：不是拷贝整个文件夹，而是文件夹里面的全部文件。

将解压后的单个文件全部拷贝到C:\Windows\System32的文件夹下。

（3）启动socket端口监听

注意：该端口需要跟代码中监听的端口一致，否则获取不到数据

nc -l -p 8081

04 源码实战demo

4.1 pom.xm依赖

<?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>com.xsy</groupId><artifactId>aurora_flink</artifactId><version>1.0-SNAPSHOT</version><!--属性设置--><properties><!--java_JDK版本--><java.version>11</java.version><!--maven打包插件--><maven.plugin.version>3.8.1</maven.plugin.version><!--编译编码UTF-8--><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><!--输出报告编码UTF-8--><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><!--json数据格式处理工具--><fastjson.version>1.2.75</fastjson.version><!--log4j版本--><log4j.version>2.17.1</log4j.version><!--flink版本--><flink.version>1.18.0</flink.version><!--scala版本--><scala.binary.version>2.11</scala.binary.version><!--log4j依赖--><log4j.version>2.17.1</log4j.version></properties><!--通用依赖--><dependencies><!-- json --><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>${fastjson.version}</version></dependency><!-- https://mvnrepository.com/artifact/org.apache.flink/flink-java --><dependency><groupId>org.apache.flink</groupId><artifactId>flink-java</artifactId><version>${flink.version}</version></dependency><dependency><groupId>org.apache.flink</groupId><artifactId>flink-streaming-scala_2.12</artifactId><version>${flink.version}</version></dependency><!-- https://mvnrepository.com/artifact/org.apache.flink/flink-clients --><dependency><groupId>org.apache.flink</groupId><artifactId>flink-clients</artifactId><version>${flink.version}</version></dependency><!--================================集成外部依赖==========================================--><!--集成日志框架 start--><dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-slf4j-impl</artifactId><version>${log4j.version}</version></dependency><dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-api</artifactId><version>${log4j.version}</version></dependency><dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-core</artifactId><version>${log4j.version}</version></dependency><!--集成日志框架 end--></dependencies><!--编译打包--><build><finalName>${project.name}</finalName><!--资源文件打包--><resources><resource><directory>src/main/resources</directory></resource><resource><directory>src/main/java</directory><includes><include>**/*.xml</include></includes></resource></resources><plugins><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-shade-plugin</artifactId><version>3.1.1</version><executions><execution><phase>package</phase><goals><goal>shade</goal></goals><configuration><artifactSet><excludes><exclude>org.apache.flink:force-shading</exclude><exclude>org.google.code.flindbugs:jar305</exclude><exclude>org.slf4j:*</exclude><excluder>org.apache.logging.log4j:*</excluder></excludes></artifactSet><filters><filter><artifact>*:*</artifact><excludes><exclude>META-INF/*.SF</exclude><exclude>META-INF/*.DSA</exclude><exclude>META-INF/*.RSA</exclude></excludes></filter></filters><transformers><transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer"><mainClass>org.xsy.sevenhee.flink.TestStreamJob</mainClass></transformer></transformers></configuration></execution></executions></plugin></plugins><!--插件统一管理--><pluginManagement><plugins><!--maven打包插件--><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><version>${spring.boot.version}</version><configuration><fork>true</fork><finalName>${project.build.finalName}</finalName></configuration><executions><execution><goals><goal>repackage</goal></goals></execution></executions></plugin><!--编译打包插件--><plugin><artifactId>maven-compiler-plugin</artifactId><version>${maven.plugin.version}</version><configuration><source>${java.version}</source><target>${java.version}</target><encoding>UTF-8</encoding><compilerArgs><arg>-parameters</arg></compilerArgs></configuration></plugin></plugins></pluginManagement></build><!--配置Maven项目中需要使用的远程仓库--><repositories><repository><id>aliyun-repos</id><url>https://maven.aliyun.com/nexus/content/groups/public/</url><snapshots><enabled>false</enabled></snapshots></repository></repositories><!--用来配置maven插件的远程仓库--><pluginRepositories><pluginRepository><id>aliyun-plugin</id><url>https://maven.aliyun.com/nexus/content/groups/public/</url><snapshots><enabled>false</enabled></snapshots></pluginRepository></pluginRepositories></project>

4.2创建socket数据流作业

package com.aurora.source;import org.apache.flink.api.common.RuntimeExecutionMode;
import org.apache.flink.streaming.api.datastream.DataStreamSource;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;import java.util.ArrayList;/*** @description flink的socket请求的source应用* @author 浅夏的猫* @datetime 23:03 2024/1/28
*/
public class FlinkSocketSourceJob {private static final Logger logger = LoggerFactory.getLogger(FlinkSocketSourceJob.class);public static void main(String[] args) throws Exception {//1.创建Flink运行环境StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();//2.设置Flink运行模式：//STREAMING-流模式，BATCH-批模式，AUTOMATIC-自动模式(根据数据源的边界性来决定使用哪种模式)env.setRuntimeMode(RuntimeExecutionMode.AUTOMATIC);//3.基于socket请求的source使用DataStreamSource<String> dataStreamSource = env.socketTextStream("localhost",8081);//4.输出打印dataStreamSource.print();//5.启动运行env.execute();}}

4.3实时cmd窗口输入数据

注意：先启动cmd窗口监听再启动程序，否则会报端口连接失败