java实现随机生成IP、电话号码、字符串

package com.wp.recruitment.utils;

import java.util.Random;

/**
*

• @author JingChun

• @date 2019/10/21
  */
  public class GetRandomUtil {

  /**

  • 随机生成ip

  • @return
    */
    public static String getIp() {
    //ip范围
    int[][] range = {{607649792, 608174079},//36.56.0.0-36.63.255.255
    {1038614528, 1039007743},//61.232.0.0-61.237.255.255
    {1783627776, 1784676351},//106.80.0.0-106.95.255.255
    {2035023872, 2035154943},//121.76.0.0-121.77.255.255
    {2078801920, 2079064063},//123.232.0.0-123.235.255.255
    {-1950089216, -1948778497},//139.196.0.0-139.215.255.255
    {-1425539072, -1425014785},//171.8.0.0-171.15.255.255
    {-1236271104, -1235419137},//182.80.0.0-182.92.255.255
    {-770113536, -768606209},//210.25.0.0-210.47.255.255
    {-569376768, -564133889}, //222.16.0.0-222.95.255.255
    };

    Random rdint = new Random();
    int index = rdint.nextInt(10);
    String ip = num2ip(range[index][0]
    + new Random().nextInt(range[index][1] - range[index][0]));
    return ip;
    }

  public static String num2ip(int ip) {
  int[] b = new int[4];
  String x = “”;

   b[0] = (int) ((ip >> 24) & 0xff);
   b[1] = (int) ((ip >> 16) & 0xff);
   b[2] = (int) ((ip >> 8) & 0xff);
   b[3] = (int) (ip & 0xff);
   x = Integer.toString(b[0]) + "." + Integer.toString(b[1]) + "."
           + Integer.toString(b[2]) + "." + Integer.toString(b[3]);
   return x;
  

  }

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  /**

  • 随机生成手机号
    */
    public static String[] telFirst = “134,135,136,137,138,139,150,151,152,157,158,159,130,131,132,155,156,133,153”.split(",");

  public static int getNum(int start, int end) {
  return (int) (Math.random() * (end - start + 1) + start);
  }

  public static String getTel() {
  int index = getNum(0, telFirst.length - 1);
  String first = telFirst[index];
  String second = String.valueOf(getNum(1, 888) + 10000).substring(1);
  String third = String.valueOf(getNum(1, 9100) + 10000).substring(1);
  return first + second + third;
  }

  /**

  • 随机生成text

  • @return
    */
    public static String getText() {
    // String str1 = “初次见面”;
    // String str2 = “好久不见”;
    // String str3 = “欢迎光临”;
    // String str4 = “拜托了”;
    // String str5 = “我能帮您做什么”;
    // String str6 = “给您添麻烦了”;
    // String str7 = “这是我应该做的”;
    // String str8 = “请多关照”;
    // String str9 = “拜托”;
    // String str10 = “您先请”;

    String[] strings = {“初次见面”, “好久不见”, “欢迎光临”, “拜托了”, “我能帮您做什么”, “给您添麻烦了”, “这是我应该做的”,
    “请多关照”, “拜托”, “您先请”};

    //产生0-(arr.length-1)的整数值,也是数组的索引

    int index=(int)(Math.random()*strings.length);
    String str = strings[index];
    return str;
    }
    }