@Test
public void byte2hex() {

    String s = "5";
    try {
        CodecUtils.hex2byte(s);
        Assert.fail();
    } catch (Exception e) {
        Assert.assertTrue(e instanceof IllegalArgumentException);
    }
    s = "567400075b6f626a65";
    byte[] bs = CodecUtils.hex2byte(s);
    Assert.assertTrue(s.equalsIgnoreCase(CodecUtils.byte2hex(bs)));
}