java 时间戳生成
转 https://blog.csdn.net/ningzxg/article/details/93894421
long timeNew = System.currentTimeMillis()/ 1000; // 10位数的时间戳
long timeNew = System.currentTimeMillis(); // 13位数的时间戳
int randomNum = (int)((Math.random()*9+1)*100000); // 随机数 6 位
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