[英]Assigning to a byte array in Java
I have a byte array I want to assign as follows: 我有一个我想要分配的字节数组,如下所示:
(byte)string.length()
(byte)string.length()
string.getBytes()
string.getBytes()
字符串数据 Other than using a for loop, is there a quick way to initialize a byte array using bytes from two different variables? 除了使用for循环之外,还有一种使用来自两个不同变量的字节初始化字节数组的快捷方法吗?
You can use System.arrayCopy()
to copy your bytes: 您可以使用
System.arrayCopy()
来复制您的字节:
String x = "xx";
byte[] out = new byte[x.getBytes().length()+1];
out[0] = (byte) (0xFF & x.getBytes().length());
System.arraycopy(x.getBytes(), 0, out, 1, x.length());
Though using something like a ByteArrayOutputStream
or a ByteBuffer
like other people suggested is probably a cleaner approach and will be better for your in the long run :-) 虽然像其他人建议的那样使用像
ByteArrayOutputStream
或ByteBuffer
这样的东西可能是一种更清洁的方法,从长远来看对你来说会更好:-)
How about ByteBuffer
? ByteBuffer
怎么样?
Example : 示例:
ByteBuffer bb = ByteBuffer.allocate(string.getBytes().length +1 );
bb.put((byte) string.length());
bb.put(string.getBytes());
While ByteBuffer
is generally the best way to build up byte arrays, given the OP's goals I think the following will be more robust: 虽然
ByteBuffer
通常是构建字节数组的最佳方法,但考虑到OP的目标,我认为以下内容将更加健壮:
public static void main(String[] argv)
throws Exception
{
String s = "any string up to 64k long";
ByteArrayOutputStream bos = new ByteArrayOutputStream();
DataOutputStream out = new DataOutputStream(bos);
out.writeUTF(s);
out.close();
byte[] bytes = bos.toByteArray();
ByteArrayInputStream bis = new ByteArrayInputStream(bytes);
DataInputStream in = new DataInputStream(bis);
String s2 = in.readUTF();
}
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