Java 平减熵问题
我正在使用Deflater通过网络发送一些消息 我正在使用：Java 平减熵问题,java,base64,compression,deflate,Java,Base64,Compression,Deflate,我正在使用Deflater通过网络发送一些消息 我正在使用： public static byte[] compress(byte[] data,int level) throws IOException { Instant starts = Instant.now(); Deflater deflater = new Deflater(); deflater.setInput(data); deflater.setLevel(/*level*
public static byte[] compress(byte[] data,int level) throws IOException {
Instant starts = Instant.now();
Deflater deflater = new Deflater();
deflater.setInput(data);
deflater.setLevel(/*level*/9);
ByteArrayOutputStream outputStream = new ByteArrayOutputStream(data.length);
deflater.finish();
byte[] buffer = new byte[1024];
while (!deflater.finished()) {
int count = deflater.deflate(buffer); // returns the generated code... index
outputStream.write(buffer, 0, count);
}
outputStream.close();
byte[] output = outputStream.toByteArray();
System.out.println("Original: " + data.length / 1024 + " Kb");
System.out.println("Compressed: " + output.length / 1024 + " Kb");
Instant ends = Instant.now();
System.out.println("deflating time:"+Duration.between(starts, ends));
return output;
}
msg.dataString
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由于熵的缺乏非常可怕，很明显，为了得到这个结果，我做了一些非常错误的事情，我在浪费带宽，或者a的序列是有效的信息。但那只是吓人。发生的事情是，对于数据的第一部分，deflate格式的压缩能力已经饱和。放气中可能的最大压缩比为1032:1 在压缩的数据中，前1083300个字节都是零。几乎所有这些都压缩到了大约1000个零字节
一切都很好。你没有做错什么。不用担心。谢谢，所以基本上超过9000个XD。。。即时通讯发送多达5个数据包x秒和一个45k/s的优化似乎是必须的。。。我会调查的。有没有什么方法可以帮你找出并剪掉无用的序列？也许我应该选择另一种压缩策略吗？如果你希望发送很多这样的空图像，那么你可以简单地再压缩一次。2416个字节在第二次压缩时压缩到1403个字节。它不是被1032倍压缩到几个字节吗？你会建议9级压缩和第二级1级压缩吗？1000个零的序列实际上压缩到了几个字节。但是，还有1400字节的压缩数据在第二次压缩时没有被压缩。第二次压缩可以是级别1，它应该采用简单的运行长度编码。只需尝试一下这些级别，看看什么最适合你。
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