importjava.util.Random;publicstaticStringgetRandomString(intlength)...{StringBufferbuffer=newStringBuffer("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ");StringBuffersb=newStringBuffer();Randomr=newRandom();intrange=buffer.length();for(inti=0;i<length;i++)...{sb.append(buffer.charAt(r.nextInt(range)));}returnsb.toString();}