基于Spark下查询ip详细信息Demo

版权声明：原创作品转载必须标明出处，谢谢配合！ https://blog.csdn.net/qq_38704184/article/details/86319874

本demo全是模拟现实的案例

所需的数据源文件链接: https://pan.baidu.com/s/1dd4AeNv4SiEToE81P6PPfA 提取码: 4qqi 

import java.io.{BufferedReader, FileInputStream, InputStreamReader}

import scala.collection.mutable.ArrayBuffer

object IpUtil {
  /**
    * 此方法针对ip进行作业
    * @param ip
    * @return
    */
  def ip2Long(ip: String): Long = {
    val fragments = ip.split("[.]")//(192,168,12,224)
    var ipNum = 0L
    for (i <- 0 until fragments.length){
      //将数组的每个元素转换成十进制
      ipNum =  fragments(i).toLong | ipNum << 8L
    }
    ipNum
  }

  /**
    * 读取给定路径下的文件
    * @param path
    * @return
    */
  def readData(path: String) = {
    val br = new BufferedReader(new InputStreamReader(new FileInputStream(path)))
    var s: String = null
    var flag = true
    val lines = new ArrayBuffer[String]()
    while (flag)
    {
      s = br.readLine()
      if (s != null)
        lines += s
      else
        flag = false
    }
    lines
  }

  /**
    * 二分查找法：数据的要求必须是已经排序好的。
    * @param lines
    * @param ip
    * @return
    *         返回值就是ip对应的区间段的索引值
    */
  def binarySearch(lines: ArrayBuffer[String], ip: Long) : Int = {
    var low = 0
    var high = lines.length - 1
    while (low <= high) {
      val middle = (low + high) / 2
      if ((ip >= lines(middle).split("\\|")(2).toLong) && (ip <= lines(middle).split("\\|")(3).toLong))
        return middle
      if (ip < lines(middle).split("\\|")(2).toLong)
        high = middle - 1
      else {
        low = middle + 1
      }
    }
    -1
  }

  def main(args: Array[String]) {
    val ip = "192.168.12.224"
    val ipNum = ip2Long(ip)
    println(ipNum)
    val lines = readData("E:ip.txt")//返回的是一个Array数组
    val index = binarySearch(lines, ipNum)//返回ip对应区间段的索引值
    print(lines(index))
  }
}