消费kafka的消息，并将其SparkStreaming结果保存到mysql

将数据保存到mysql，需要用到jdbc。为了提高保存速度，我写了一个连接池

1.保存到mysql的代码

package test05

import org.apache.log4j.{Level, Logger}
import org.apache.spark.rdd.RDD
import org.apache.spark.sql.types._
import org.apache.spark.sql._
import org.apache.spark.streaming.dstream.DStream
import org.apache.spark.{SparkConf, SparkContext}
import org.apache.spark.streaming.{Seconds, StreamingContext}
import org.apache.spark.streaming.kafka.KafkaUtils

object SaveDataToMysql {
  def main(args: Array[String]): Unit = {

    // 屏蔽不必要的日志 ,在终端上显示需要的日志
    Logger.getLogger("org.apache.spark").setLevel(Level.OFF)
    Logger.getLogger("org.eclipse.jetty.server").setLevel(Level.OFF)
    Logger.getLogger("org.apache.kafka.clients.consumer").setLevel(Level.OFF)

   //初始化sparkStreaming
    val conf = new SparkConf().setAppName("SaveDataToMysql").setMaster("local[*]")
    val sc = new SparkContext(conf)
    val ssc = new StreamingContext(sc, Seconds(10))

    //连接s3需要的key和密码
    ssc.sparkContext.hadoopConfiguration.set("fs.s3a.access.key","aws的key")
    ssc.sparkContext.hadoopConfiguration.set("fs.s3a.secret.key","aws的密码")
    ssc.sparkContext.hadoopConfiguration.set("fs.s3a.endpoint", "s3.cn-north-1.amazonaws.com.cn")
    

    //设置连接Kafka的配置信息
    val zkQuorum  = "192.168.1.112:2181"    //zookeeper集群的IP：port，IP：port，IP：port
    val group = "testgroup"                //在consumer.properties配置group.id
    val topics = "huiliyang"               //选择要连接的producer，它是以topic来区分每个producer的。例如：我这里的创建的topic是huiliyang
    val numThreads = 2                    //线程
    val topicpMap = topics.split("\n").map((_,numThreads.toInt)).toMap   //这个是有可能有好几个topic同时提供数据，那么我们要把它用空格分割开，然后映射成(topic,2),再转换成map集合

    ssc.checkpoint("checkpoint"

    val lines: DStream[String] = KafkaUtils.createStream(ssc,zkQuorum,group,topicpMap).map(_._2)    //创建流

    lines.print()

    //保存到mysql
    lines.map(x=>x.split(",")).foreachRDD(line =>{
      line.foreachPartition(rdd =>{
        val conn = ConnectPoolUtil.getConnection      //ConnectPoolUtil是我创建的一个数据库连接池，getConnection是它的一个方法

        conn.setAutoCommit(false);  //设为手动提交   

        val  stmt = conn.createStatement()
        rdd.foreach(word=>{
          stmt.addBatch("insert into test_log2(time, ip, user_id, user_type, source, scene) values('" + word(0)+"','"+word(1)+"','"+word(2)+"','"+word(3)+"','"+word(4)+"','"+word(5) + "')")
        })
        stmt.executeBatch()
        conn.commit()
        conn.close()
      })
    })
    ssc.start()
    ssc.awaitTermination()

  }

}


数据库连接池代码：

package test05

import java.sql.{Connection, PreparedStatement, ResultSet}
import org.apache.commons.dbcp.BasicDataSource


object ConnectPoolUtil {

  private var bs:BasicDataSource = null

  /**
    * 创建数据源
    * @return
    */
  def getDataSource():BasicDataSource={
    if(bs==null){
      bs = new BasicDataSource()
      bs.setDriverClassName("com.mysql.jdbc.Driver")
      bs.setUrl("jdbc:mysql://localhost:3306/school")
      bs.setUsername("root")
      bs.setPassword("123456")
      bs.setMaxActive(200)           //设置最大并发数
      bs.setInitialSize(30)          //数据库初始化时，创建的连接个数
      bs.setMinIdle(50)              //最小空闲连接数
      bs.setMaxIdle(200)             //数据库最大连接数
      bs.setMaxWait(1000)
      bs.setMinEvictableIdleTimeMillis(60*1000)     //空闲连接60秒中后释放
      bs.setTimeBetweenEvictionRunsMillis(5*60*1000)      //5分钟检测一次是否有死掉的线程
      bs.setTestOnBorrow(true)
    }
    bs
  }

  /**
    * 释放数据源
    */
  def shutDownDataSource(){
    if(bs!=null){
      bs.close()
    }
  }

  /**
    * 获取数据库连接
    * @return
    */
  def getConnection():Connection={
    var con:Connection = null
    try {
      if(bs!=null){
        con = bs.getConnection()
      }else{
        con = getDataSource().getConnection()
      }
    } catch{
      case e:Exception => println(e.getMessage)
    }
    con
  }

  /**
    * 关闭连接
    */
  def closeCon(rs:ResultSet ,ps:PreparedStatement,con:Connection){
    if(rs!=null){
      try {
        rs.close()
      } catch{
        case e:Exception => println(e.getMessage)
      }
    }
    if(ps!=null){
      try {
        ps.close()
      } catch{
        case e:Exception => println(e.getMessage)
      }
    }
    if(con!=null){
      try {
        con.close()
      } catch{
        case e:Exception => println(e.getMessage)
      }
    }
  }
}

pom文件

<properties>
  <scala.version>2.11.8</scala.version>
  <spark.version>2.2.0</spark.version>
  <hadoop.version>2.7.2</hadoop.version>
  <spark.pom.scope>compile</spark.pom.scope>
</properties>

<dependencies>
  <dependency>
    <groupId>org.apache.spark</groupId>
    <artifactId>spark-core_2.11</artifactId>
    <version>${spark.version}</version>
    <!--<scope>${spark.pom.scope}</scope>-->
  </dependency>
  <dependency>
    <groupId>org.apache.spark</groupId>
    <artifactId>spark-streaming_2.11</artifactId>
    <version>${spark.version}</version>
  </dependency>
  <dependency>
    <groupId>org.apache.spark</groupId>
    <artifactId>spark-streaming-kafka-0-8_2.11</artifactId>
    <version>2.2.0</version>
  </dependency>
  <dependency>
    <groupId>org.apache.spark</groupId>
    <artifactId>spark-sql_2.11</artifactId>
    <version>${spark.version}</version>
    <!--<scope>${spark.pom.scope}</scope>-->
  </dependency>
<dependency>
  <groupId>mysql</groupId>
   <artifactId>mysql-connector-java</artifactId>
   <version>5.1.39</version>
</dependency>

</dependencies>