字符串加空后变十六进制ASCII码

例如输入12345678变成够10位的十六进制ASCII码

public class TestFire {
	//bytesToHexString
	public static String bytesToHexString(byte[] src) {
		StringBuilder stringBuilder = new StringBuilder("");
		if (src == null || src.length <= 0) {
			return "";
		}
		for (int i = 0; i < src.length; i++) {
			int v = src[i] & 0xFF;
			String hv = Integer.toHexString(v);
			if (hv.length() < 2) {
				stringBuilder.append(0);
			}
			stringBuilder.append(hv);
		}
		return stringBuilder.toString();
	}
	//右字符加指定长度空格
	public static String addRightSpace(String str, int length) {
		int str_length = str.length();
		for (int i = 0; i < (length - str_length); i = i + 1) {
			str = str + ' ';
		}
		return str;
	}
	public static void main(String[] args) {
		String str=bytesToHexString(addRightSpace("12345678", 10).getBytes());
		System.out.println(str);
	}
}