public String getString() { String pkValue; String str = new SimpleDateFormat("yyyyMMddHHmmssSSS").format(new Date()); int rannum = (int) (new Random().nextDouble() * (999 - 100 + 1)) + 100;// 获取3位随机数 // pkValue= UUID.randomUUID().toString().replace("-",""); pkValue= str+rannum; return pkValue; }