Two ways to generate random strings in Java

This article mainly introduces two methods of generating random strings in Java in detail. It has certain reference value. Interested friends can refer to it.

The examples in this article share Java with you. The specific code to generate a random string is for your reference. The specific content is as follows

import java.util.Random;
public class CharacterUtils {
//方法1：length为产生的位数
  public static String getRandomString(int length){
    //定义一个字符串（A-Z，a-z，0-9）即62位；
    String str="zxcvbnmlkjhgfdsaqwertyuiopQWERTYUIOPASDFGHJKLZXCVBNM1234567890";
    //由Random生成随机数
        Random random=new Random();  
        StringBuffer sb=new StringBuffer();
        //长度为几就循环几次
        for(int i=0; i<length; ++i){
          //产生0-61的数字
          int number=random.nextInt(62);
          //将产生的数字通过length次承载到sb中
          sb.append(str.charAt(number));
        }
        //将承载的字符转换成字符串
        return sb.toString();
  }
  /**
   * 第二种方法
   */
  public static String getRandomString2(int length){
    //产生随机数
    Random random=new Random();
    StringBuffer sb=new StringBuffer();
    //循环length次
    for(int i=0; i<length; i++){
      //产生0-2个随机数，既与a-z，A-Z，0-9三种可能
      int number=random.nextInt(3);
      long result=0;
      switch(number){
      //如果number产生的是数字0；
      case 0:
        //产生A-Z的ASCII码
        result=Math.round(Math.random()*25+65);
        //将ASCII码转换成字符
        sb.append(String.valueOf((char)result));
        break;
        case 1:
          //产生a-z的ASCII码
        result=Math.round(Math.random()*25+97);
          sb.append(String.valueOf((char)result));
        break;
        case 2:
          //产生0-9的数字
                   sb.append(String.valueOf
                          (new Random().nextInt(10)));
        break; 
      }
    }
    return sb.toString();
  }
  public static void main(String[] args) {
    System.out.println(CharacterUtils.getRandomString(12));
     
  }
   
}

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