我知道随机UUID在理论上具有非常非常非常低的碰撞概率,但我想知道,在实践中,Java 5 randomUUID()在没有碰撞方面有多好?有没有人有经验可以分享?
几个月来,我一直在使用一个类来生成一个在reintalls之间稳固的UUID.我的应用程序是关于折扣,所以我依靠这个UUID来限制每台设备的优惠券数量.
protected void getDeviceId(){
try {
Context context = cordova.getActivity().getApplicationContext();
TelephonyManager tm = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
String uuid;
String androidID = Secure.getString(context.getContentResolver(), Secure.ANDROID_ID);
String deviceID = tm.getDeviceId();
String simID = tm.getSimSerialNumber();
if ("9774d56d682e549c".equals(androidID) || androidID == null) {
androidID = "";
}
if (deviceID == null) {
deviceID = "";
}
if (simID == null) {
simID = "";
}
uuid = androidID + deviceID + simID;
uuid = String.format("%32s", uuid).replace(' ', '0');
uuid = uuid.substring(0, 32);
uuid = uuid.replaceAll("(\\w{8})(\\w{4})(\\w{4})(\\w{4})(\\w{12})", "$1-$2-$3-$4-$5"); …Run Code Online (Sandbox Code Playgroud)