在java中将UTF-16 unicode字符转换为UTF-8

import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.StandardCharsets;

public class UnicodeToUTF8Converter {
    public static byte[] convertToUTF8(String unicodeString) {
        CharsetEncoder utf8Encoder = StandardCharsets.UTF_8.newEncoder();
        byte[] utf8Bytes = null;
        try {
            utf8Bytes = unicodeString.getBytes(utf8Encoder);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return utf8Bytes;
    }

    public static void main(String[] args) {
        String unicodeString = "你好，世界！";
        byte[] utf8Bytes = convertToUTF8(unicodeString);
        System.out.println("UTF-8 bytes: " + new String(utf8Bytes, StandardCharsets.UTF_8));
    }
}