android aes加密後在線解密網站無法解密的問題

由於項目需要aes加密，所以在網上找了幾個aes加密工具。本想拿來直接用，發現都是加密後在一些在線解密網站無法解密成功（如這個網站 http://www.seacha.com/tools/aes.html），所以不得不自己寫一份，下面是能直接在在線解密網站解密成功的代碼，發出來以避免大家重複的造輪子。

package com.runmeng.sycz.util;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;


public class AESUtil {

/**
 * @param
 * @return AES加密算法加密
 * @throws Exception
 */
public static String encrypt(String seed, String key)
        throws Exception {
    byte[] result = encrypt(seed.getBytes("utf-8"), key.getBytes());
    return toHex(result);
}

public static String decryptString(String src, String key) throws Exception {
    byte[] input = toByte(src);
    Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
    SecretKeySpec securekey = new SecretKeySpec(key.getBytes(), "AES");//設置加密Key
    cipher.init(Cipher.DECRYPT_MODE, securekey);//設置密鑰和解密形式
    byte[] result= cipher.doFinal(input);
    String resultStr=new String(result,"utf-8");
    return resultStr;
}

private static byte[] encrypt(byte[] byteData, byte[] byteKey) throws Exception {
    Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
    SecretKeySpec skeySpec = new SecretKeySpec(byteKey, "AES");
    cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
    byte[] decrypted = cipher.doFinal(byteData);
    return decrypted;
}

private static String toHex(byte[] buf) {//字符串轉換爲16進制
    final String HEX = "0123456789ABCDEF";
    if (buf == null)
        return "";
    StringBuffer result = new StringBuffer(2 * buf.length);
    for (int i = 0; i < buf.length; i++) {
        result.append(HEX.charAt((buf[i] >> 4) & 0x0f)).append(
                HEX.charAt(buf[i] & 0x0f));
    }
    return result.toString();
}

private static byte[] toByte(String hexString) {//16進制轉換爲字符串
    int len = hexString.length() / 2;
    byte[] result = new byte[len];
    for (int i = 0; i < len; i++)
        result[i] = Integer.valueOf(hexString.substring(2 * i, 2 * i + 2),
                16).byteValue();
    return result;
}

}