public static String getRtNum(int length) { 	int nSeed = 0; 	int nSeedSize = 62;  	String strSrc = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";  	String strKey = ""; 	for(int i=0; i<length; i++){ 		nSeed = (int)(Math.random() * nSeedSize) + 1; 		strKey += String.valueOf(strSrc.charAt(nSeed-1)); 	} 	return strKey; }
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