How to convert chinese characters to hexadecimal in java

Question

I want to convert unicode characters which have code values in 2 byte, 3 byte range to hexadecimal.

I know how to convert characters to hexadecimal. For which, I am first converting characters to ascii by casting using int. And from that i convert to hexadecimal using Integer.tohexString.

However, I am not sure how to deal with unicode characters like chinese, etc. Can someone help?

Answer 1

You should not handle the String as an array of bytes in Java... But if you want, you can use getBytes()

byte[] bs = "中文".getBytes("utf-8");
for(byte b : bs)
    System.out.print(Integer.toHexString(b) + " ");

Answer 2

See my comment .

Don't "convert to ASCII"; Java char is big enough to support the entire Basic Multilingual Plane , which should contain CJK Han script.

/* 七 -> 4e03 */
assert "4e03".equals(Integer.toHexString('七'));

Answer 3

I think you might want to rethink your approach.

In general, it sounds like you want to do some sort of I/O of this data. In general, you do that with character encodings and the java.io Reader/Writer API.

See InputStreamReader and OutputStreamWriter.

You can always send the output of a writer to a FileOutputStream (or ByteArrayOutputStream for that matter) to get the characters out as binary data.

out = new PrintWriter(new OutputStreamWriter(new FileOutputStream("file"), "utf-8"));
out.println("...");

If you want to then base64 encode that data or just represent it as ascii hex, that is a pretty simple thing.