String random = String.valueOf(new Random().nextInt(9000));
String timestamp = String.valueOf(System.currentTimeMillis() / 1000);
random = random + timestamp;
String random = String.valueOf(new Random().nextInt(9000));
String timestamp = String.valueOf(System.currentTimeMillis() / 1000);
random = random + timestamp;
《java生成随机数方法.doc》
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