生成随机字符串

<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.6</version>
</dependency>

//产生5位长度的随机字符串，中文环境下是乱码
String s1 = RandomStringUtils.random(5);
//使用指定的字符生成5位长度的随机字符串
String s2 = RandomStringUtils.random(5, new char[]{'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','0', '1', '2', '3','4','5','6','7','8','9',
'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'});
//生成指定长度的字母和数字的随机组合字符串
String s3 = RandomStringUtils.randomAlphanumeric(5);
//生成随机数字字符串
String s4 = RandomStringUtils.randomNumeric(5);
//生成随机[a-z]字符串，包含大小写
String s5 = RandomStringUtils.randomAlphabetic(5);
//生成从ASCII 32到126组成的随机字符串
String s6 = RandomStringUtils.randomAscii(4);

System.out.println(s1);
System.out.println(s2);
System.out.println(s3);
System.out.println(s4);
System.out.println(s5);
System.out.println(s6);

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运行结果：
汱毧鮞𣾞
oUUd3
iOS2A
03755
esDcz
!Wnr