Sprak2.0 Streaming消费Kafka数据实时计算及运算结果保存数据库代码示例

package com.gm.hive.SparkHive;

import java.util.Arrays;

import java.util.Collection;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.Properties;

import org.apache.kafka.clients.consumer.ConsumerRecord;

import org.apache.kafka.common.serialization.StringDeserializer;

import org.apache.spark.SparkConf;

import org.apache.spark.api.java.JavaPairRDD;

import org.apache.spark.api.java.JavaRDD;

import org.apache.spark.api.java.JavaSparkContext;

import org.apache.spark.api.java.Optional;

import org.apache.spark.api.java.function.Function;

import org.apache.spark.api.java.function.Function2;

import org.apache.spark.api.java.function.VoidFunction;

import org.apache.spark.sql.Dataset;

import org.apache.spark.sql.Row;

import org.apache.spark.sql.SaveMode;

import org.apache.spark.sql.SparkSession;

import org.apache.spark.streaming.Durations;

import org.apache.spark.streaming.api.java.JavaInputDStream;

import org.apache.spark.streaming.api.java.JavaPairDStream;

import org.apache.spark.streaming.api.java.JavaStreamingContext;

import org.apache.spark.streaming.kafka010.ConsumerStrategies;

import org.apache.spark.streaming.kafka010.KafkaUtils;

import org.apache.spark.streaming.kafka010.LocationStrategies;

import scala.Tuple2;

public class App {

	public static void main(String[] args) {

		// TODO Auto-generated method stub

		SparkConf conf = new SparkConf().setMaster("local[2]").setAppName(

				"streamingTest");

		JavaSparkContext sc = new JavaSparkContext(conf);

		sc.setLogLevel("ERROR");

		sc.setCheckpointDir("./checkpoint");

		JavaStreamingContext ssc = new JavaStreamingContext(sc,

				Durations.seconds(10));

		// kafka相关参数，必要！缺了会报错

		Map<String, Object> kafkaParams = new HashMap<>();

		kafkaParams.put("bootstrap.servers", "192.168.174.200:9092");

		kafkaParams.put("key.deserializer", StringDeserializer.class);

		kafkaParams.put("value.deserializer", StringDeserializer.class);

		kafkaParams.put("group.id", "newgroup2");

		kafkaParams.put("auto.offset.reset", "latest");

		kafkaParams.put("enable.auto.commit", false);

		Collection<String> topics = Arrays.asList("test");

		JavaInputDStream<ConsumerRecord<String, String>> stream = KafkaUtils

				.createDirectStream(ssc, LocationStrategies.PreferConsistent(),

						ConsumerStrategies.<String, String> Subscribe(topics,

								kafkaParams));

		// 注意这边的stream里的参数本身是个ConsumerRecord对象

		JavaPairDStream<String, Integer> counts = stream

				.flatMap(

						x -> Arrays.asList(x.value().toString().split(" "))

								.iterator())

				.mapToPair(x -> new Tuple2<String, Integer>(x, 1))

				.reduceByKey((x, y) -> x + y);

		//counts.print();

		JavaPairDStream<String, Integer> result = counts

				.updateStateByKey(new Function2<List<Integer>, Optional<Integer>, Optional<Integer>>() {

					private static final long serialVersionUID = 1L;

					@Override

					public Optional<Integer> call(List<Integer> values,

							Optional<Integer> state) throws Exception {

						/**

						 * values:经过分组最后 这个key所对应的value，如：[1,1,1,1,1]

						 * state:这个key在本次之前之前的状态

						 */

						Integer updateValue = 0;

						if (state.isPresent()) {

							updateValue = state.get();

						}

						for (Integer value : values) {

							updateValue += value;

						}

						return Optional.of(updateValue);

					}

				});

		//数据库内容

		String url = "jdbc:postgresql://192.168.174.200:5432/postgres?charSet=utf-8";

		Properties connectionProperties = new Properties();

		connectionProperties.put("user","postgres");

		connectionProperties.put("password","postgres");

		connectionProperties.put("driver","org.postgresql.Driver");

		result.print();

		result.foreachRDD(new VoidFunction<JavaPairRDD<String, Integer>>(){

			public void call(JavaPairRDD<String, Integer> rdd)

					throws Exception {

				// TODO Auto-generated method stub

				JavaRDD<ResultRow> rowRDD = rdd.map(new Function<Tuple2<String, Integer>,ResultRow>(){

					public ResultRow call(Tuple2<String, Integer> arg0)

							throws Exception {

						// TODO Auto-generated method stub

						ResultRow rr = new ResultRow();

						rr.setTypeid(arg0._1);

						rr.setKczs(arg0._2);

						return rr;

					}

				});

				SparkSession spark = SparkSession.builder().config(rdd.context().getConf()).getOrCreate();

				Dataset<Row>  data = spark.createDataFrame(rowRDD, ResultRow.class);

				//将数据通过覆盖的形式保存在数据表中

				data.write().mode(SaveMode.Overwrite).jdbc(url, "kcssqktj", connectionProperties);

			}

		});

		ssc.start();

		try {

			ssc.awaitTermination();

		} catch (InterruptedException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		}

		ssc.close();

	}

}

package com.gm.hive.SparkHive;

import java.io.Serializable;

public class ResultRow implements Serializable {

	private static final long serialVersionUID = 6681372116317508248L;

	String typeid;

	int kczs;

	public String getTypeid() {

		return typeid;

	}

	public void setTypeid(String typeid) {

		this.typeid = typeid;

	}

	public int getKczs() {

		return kczs;

	}

	public void setKczs(int kczs) {

		this.kczs = kczs;

	}

}

<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.test</groupId>

	<artifactId>kcssqktj_spark</artifactId>

	<version>0.0.1-SNAPSHOT</version>

	<properties>

		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

	</properties>

	<dependencies>

		<dependency>

			<groupId>junit</groupId>

			<artifactId>junit</artifactId>

			<version>3.8.1</version>

			<scope>test</scope>

		</dependency>

		<dependency>

			<groupId>org.slf4j</groupId>

			<artifactId>slf4j-log4j12</artifactId>

			<version>1.7.22</version>

		</dependency>

		<dependency>

			<groupId>org.apache.hadoop</groupId>

			<artifactId>hadoop-client</artifactId>

			<version>2.8.0</version>

			<exclusions>

				<exclusion>

					<groupId>javax.servlet</groupId>

					<artifactId>*</artifactId>

				</exclusion>

			</exclusions>

		</dependency>

		<dependency>

			<groupId>org.apache.spark</groupId>

			<artifactId>spark-sql_2.11</artifactId>

			<version>2.0.0</version>

		</dependency>

		<dependency>

			<groupId>org.apache.spark</groupId>

			<artifactId>spark-hive_2.11</artifactId>

			<version>2.0.0</version>

		</dependency>

		<dependency>

			<groupId>org.apache.spark</groupId>

			<artifactId>spark-streaming_2.11</artifactId>

			<version>2.0.0</version>

			<exclusions>

				<exclusion>

					<artifactId>slf4j-log4j12</artifactId>

					<groupId>org.slf4j</groupId>

				</exclusion>

			</exclusions>

		</dependency>

		<dependency>

			<groupId>org.apache.spark</groupId>

			<artifactId>spark-core_2.11</artifactId>

			<version>2.0.0</version>

		</dependency>

		<!-- https://mvnrepository.com/artifact/org.apache.hive/hive-jdbc -->

		<dependency>

			<groupId>org.apache.hive</groupId>

			<artifactId>hive-jdbc</artifactId>

			<version>2.1.1</version>

		</dependency>

		<!-- https://mvnrepository.com/artifact/org.apache.hive/hive-exec -->

		<dependency>

			<groupId>org.apache.hive</groupId>

			<artifactId>hive-exec</artifactId>

			<version>2.1.1</version>

		</dependency>

		<dependency>

			<groupId>org.postgresql</groupId>

			<artifactId>postgresql</artifactId>

			<version>9.4-1201-jdbc4</version>

		</dependency>

		<dependency>

			<groupId>org.apache.spark</groupId>

			<artifactId>spark-streaming-kafka-0-10_2.11</artifactId>

			<version>2.0.0</version>

		</dependency>

	</dependencies>

	<build>

		<plugins>

			<plugin>

				<groupId>org.apache.maven.plugins</groupId>

				<artifactId>maven-compiler-plugin</artifactId>

				<configuration>

					<source>1.8</source>

					<target>1.8</target>

				</configuration>

			</plugin>

			<plugin>

				<groupId>org.apache.maven.plugins</groupId>

				<artifactId>maven-shade-plugin</artifactId>

				<configuration>

					<source>1.8</source>

					<target>1.8</target>

				</configuration>

				<executions>

					<execution>

						<phase>package</phase>

						<goals>

							<goal>shade</goal>

						</goals>

						<configuration>

							<shadedArtifactAttached>true</shadedArtifactAttached>

							<shadedClassifierName>allinone</shadedClassifierName>

							<artifactSet>

								<includes>

									<include>*:*</include>

								</includes>

							</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.AppendingTransformer">

									<resource>reference.conf</resource>

								</transformer>

								<transformer

									implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">

									<resource>META-INF/spring.handlers</resource>

								</transformer>

								<transformer

									implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">

									<resource>META-INF/spring.schemas</resource>

								</transformer>

								<transformer

									implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">

									<manifestEntries>

										<Main-Class></Main-Class>

									</manifestEntries>

								</transformer>

							</transformers>

						</configuration>

					</execution>

				</executions>

			</plugin>

		</plugins>

	</build>

</project>

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Sprak2.0 Streaming消费Kafka数据实时计算及运算结果保存数据库代码示例

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