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SmsTest.java

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package smsVerCode;

public class SmsTest {

/**

* 创建指定数量的随机字符串

* @param numberFlag 是否是数字

* @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{

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(i);

if (('0'<=c)&&(c<='9')) {

count++;

}

retStr+=strTable.charAt(intR);

}

if (count>=2) {

bDone=false;

}

}while(bDone);

return retStr;

}

public static void main(String[] args) {

createRandom(false, 4);

}

}