php和javahmac_sha1哈希不一样

我正试图将一条消息散列到用php编写并由HMAC_SHA1算法编码的服务器端（我无法更改他的代码）。我正在用Java编写代码。php代码如下：

$utf8Str = mb_convert_encoding($strToSign, "UTF-8");
$hmac_sha1_str = base64_encode(hash_hmac("sha1", $utf8Str, KEY));
$signature = urlencode($hmac_sha1_str);

我的java代码是：

private static String HashStringSign(String toHash){
try {
    String afterUTF = new String(toHash.getBytes(), "UTF-8");
    String res = hmac_sha1(afterUTF, SecretAccessKey);
    String signature = new String(Base64.encode(res.getBytes()));
    String result = URLEncoder.encode(signature);
        return result;
    } catch (UnsupportedEncodingException e) {
        throw new RuntimeException(e);
    }
}
private static String hmac_sha1(String value, String key) {
    try {
        // Get an hmac_sha1 key from the raw key bytes
        byte[] keyBytes = key.getBytes();           
        SecretKeySpec signingKey = new SecretKeySpec(keyBytes, "HmacSHA1");
        // Get an hmac_sha1 Mac instance and initialize with the signing key
        Mac mac = Mac.getInstance("HmacSHA1");
        mac.init(signingKey);
        // Compute the hmac on input data bytes
        byte[] rawHmac = mac.doFinal(value.getBytes());
        // Convert raw bytes to Hex
        byte[] hexBytes = new Hex().encode(rawHmac);
        return new String(hexBytes, "UTF-8");
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

我遵循了php代码中使用的每一个哈希方法，并且按照与您所看到的相同的顺序。也许java中有一个函数在php中的工作方式不同？

我使用的是-com.sun.org.apache.xml.internal.security.utils.Base64java.net.URLEncoder、javax.crypto和org.apache.mons.codec.binary

谢谢！