java随机产生字符串
/**
* 产生随机字符串
* */
private static Random randGen = null;
private static char[] numbersAndLetters = null;
private static Object initLock = new Object();
public static final String randomString(int length) {
if (length < 1) {
return null;
}
if (randGen == null) {
synchronized (initLock) {
if (randGen == null) {
randGen = new Random();
numbersAndLetters = ("0123456789abcdefghijklmnopqrstuvwxyz" +
"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ").toCharArray();
//numbersAndLetters = ("0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ").toCharArray();
}
}
}
char [] randBuffer = new char[length];
for (int i=0; i<randBuffer.length; i++) {
randBuffer[i] = numbersAndLetters[randGen.nextInt(71)];
//randBuffer[i] = numbersAndLetters[randGen.nextInt(35)];
}
return new String(randBuffer);
}
调用此方法randomString(int),int是字符串的长度,即可产生指定长度的随机字符串。
原文出处:http://hi.baidu.com/samuel_vong/blog/item/95471f7e2cdab33d0cd7dad1.html