scala打印error，debug，info

1.以wordcount为例

package org.apache.spark.examples

import org.apache.spark.examples.SparkPi.logger
import org.apache.spark.{SparkConf, SparkContext}

object word {

  private val logger = org.slf4j.LoggerFactory.getLogger(this.getClass)
    def main(args: Array[String]) {
      val conf = new SparkConf()
        .setAppName("WordCount").setMaster("local")
      val sc = new SparkContext(conf)
      logger.info("this is textFile1" )
      println("this is textFile2print")
      logger.error("this is textFile3err")
      logger.warn("this is textFile4warn")
     logger.debug("this is textFile5debug")
      val lines = sc.textFile("E:\spark_file\wordcount.txt", 1)
      val words = lines.flatMap { line => line.split(" ") }
      val pairs = words.map { word => (word, 1) }
      val wordCounts = pairs.reduceByKey { _ + _ }
      wordCounts.foreach(wordCount => println(wordCount._1 + " appeared " + wordCount._2 + " times."))
    }
}

2.控制台输出结果：