如何组合两个字节数组

Question

我有两个字节数组,我想知道如何将一个添加到另一个或组合它们以形成一个新的字节数组.

Answer 1

你只是想连接两个字节数组？

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);

或者您可以使用List来完成工作:

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()]);

Answer 2

您可以使用Apace common lang package(org.apache.commons.lang.ArrayUtilsclass)来完成此操作.您需要执行以下操作

byte[] concatBytes = ArrayUtils.addAll(one,two);

Answer 3

我认为这是最好的方法，

public static byte[] addAll(final byte[] array1, byte[] array2) {
    byte[] joinedArray = Arrays.copyOf(array1, array1.length + array2.length);
    System.arraycopy(array2, 0, joinedArray, array1.length, array2.length);
    return joinedArray;
}