packageorg.jimmy.autosearch2019.test;importjava.util.ArrayList;importjava.util.Random;/***@authorラピスラズリ(Dawn)

* @date 2019年5月30日 下午3:18:48

* @detail 随机生成固定长度的字符串*/

public classTestRandom2019053001 {public static ArrayList strList = new ArrayList();public static Random random = newRandom();public static final int RANDOM_LENGTH1 = 256;public static final int RANDOM_LENGTH2 = 512;public static final int RANDOM_LENGTH3 = 1024;static{

init();

}public static voidmain(String[] args) {

String randomStr=generateRandomStr(RANDOM_LENGTH1);

System.out.println(RANDOM_LENGTH1+ "位随机数:" +randomStr);

randomStr=generateRandomStr(RANDOM_LENGTH2);

System.out.println(RANDOM_LENGTH2+ "位随机数:" +randomStr);

randomStr=generateRandomStr(RANDOM_LENGTH3);

System.out.println(RANDOM_LENGTH3+ "位随机数:" +randomStr);

}public static String generateRandomStr(intlength) {

StringBuffer sb= newStringBuffer();for(int i = 0; i < length; i++) {int size =strList.size();

String randomStr=strList.get(random.nextInt(size));

sb.append(randomStr);

}returnsb.toString();

}public static voidinit() {int begin = 97;//生成小写字母,并加入集合

for(int i = begin; i < begin + 26; i++) {

strList.add((char)i + "");

}//生成大写字母,并加入集合

begin = 65;for(int i = begin; i < begin + 26; i++) {

strList.add((char)i + "");

}//将0-9的数字加入集合

for(int i = 0; i < 10; i++) {

strList.add(i+ "");

}

}

}

运行后效果:java

256位随机数:qZP66hBKD2qZUNNw0seH2auRjw7wvtVAUAlV6Ze5jZXzL8H6MXSKSKcA3a5ae116DhMLD0jXlbNQp1YlRpDIpijbn9EtqPlWsIbvlrE1fZtnY8K88N6uhOYsCZc44A064arq0bK4tkCvVcXLPTyGeHJkBfujOrQfpkydRGTY1cGVSUgdVhrtyDUjBpNf393WRygZKSDUy704B2hzXWw7lTRImD5Y1evtXmglo4xmJn7XogvlsnenKlNtnZhfIz42

512位随机数: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

1024位随机数: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