如何合并两个字节数组 [英] How to combine two byte arrays

问题描述

我有两个字节数组，我想知道如何将一个添加到另一个字节数组或将它们组合以形成一个新的字节数组.

I have two byte arrays and I am wondering how I would go about adding one to the other or combining them to form a new byte array.

推荐答案

您是要串联两个byte数组吗?

You're just trying to concatenate the two byte arrays?

byte[] one = getBytesForOne();
byte[] two = getBytesForTwo();
byte[] combined = new byte[one.length + two.length];

for (int i = 0; i < combined.length; ++i)
{
    combined[i] = i < one.length ? one[i] : two[i - one.length];
}

或者您可以使用System.arraycopy:

byte[] one = getBytesForOne();
byte[] two = getBytesForTwo();
byte[] combined = new byte[one.length + two.length];

System.arraycopy(one,0,combined,0         ,one.length);
System.arraycopy(two,0,combined,one.length,two.length);

或者您也可以使用List来完成工作:

Or you could just use a List to do the work:

byte[] one = getBytesForOne();
byte[] two = getBytesForTwo();

List<Byte> list = new ArrayList<Byte>(Arrays.<Byte>asList(one));
list.addAll(Arrays.<Byte>asList(two));

byte[] combined = list.toArray(new byte[list.size()]);

或者您可以简单地使用ByteBuffer并添加许多数组.

Or you could simply use ByteBuffer with the advantage of adding many arrays.

byte[] allByteArray = new byte[one.length + two.length + three.length];

ByteBuffer buff = ByteBuffer.wrap(allByteArray);
buff.put(one);
buff.put(two);
buff.put(three);

byte[] combined = buff.array();

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