在Java中生成具有特定位大小的随机字符串 [英] Generate a random string with a specific bit size in java

问题描述

我该怎么做?似乎找不到办法.Securerandom似乎不允许我在任何地方指定位大小

How do i do that? Can't seems to find a way. Securerandom doesn't seems to allow me to specify bit size anywhere

推荐答案

如果您的位数可以除以8，也就是说，您需要完整的字节数，则可以使用

If your bit-count can be divded by 8, in other words, you need a full byte-count, you can use

Random random = ThreadLocalRandom.current();
byte[] r = new byte[256]; //Means 2048 bit
random.nextBytes(r);
String s = new String(r)

如果您不喜欢这些奇怪的字符，请将字节数组编码为base64:

If you don't like the strange characters, encode the byte-array as base64:

例如，使用 Apache Commons Codec 并执行:

Random random = ThreadLocalRandom.current();
byte[] r = new byte[256]; //Means 2048 bit
random.nextBytes(r);
String s = Base64.encodeBase64String(r);

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