Instance code of random generation of mobile phone short message verification code based on Java
- 2021-07-16 02:35:19
- OfStack
Simple version
/** * Produce 4 Bit random number (0000-9999)
*
* @return 4 Bit random number
*/
public static String getFourRandom() {
return StringUtils.leftPad(new Random().nextInt(10000) + "", 4, "0");
}
Complex version
/**
* Creates a specified number of random strings
* @param numberFlag Is it a number
* @param length
* @return
*/
public static String createRandom(boolean numberFlag, int length){
String retStr = "";
String strTable = numberFlag ? "1234567890" : "1234567890abcdefghijkmnpqrstuvwxyz";
int len = strTable.length();
boolean bDone = true;
do {
retStr = "";
int count = 0;
for (int i = 0; i < length; i++) {
double dblR = Math.random() * len;
int intR = (int) Math.floor(dblR);
char c = strTable.charAt(intR);
if (('0' <= c) && (c <= '9')) {
count++;
}
retStr += strTable.charAt(intR);
}
if (count >= 2) {
bDone = false;
}
} while (bDone);
return retStr;
}
Summarize
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