Java: 如何将字符串转成base64字符串？

Question

我正在使用这种方法来解密收到的消息：

private static String decrypt(String key, String initVector, String dataToDecrypt) {
    try {
        IvParameterSpec iv = new IvParameterSpec(initVector.getBytes("UTF-8"));
        SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes("UTF-8"), "AES");

        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
        cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);

        String safeString = dataToDecrypt.replace('-', '+').replace('_', '/');
        byte[] decodedString = Base64.decodeBase64(safeString);

        byte[] original = cipher.doFinal(decodedString);

        return new String(original);
    } catch (Exception ex) {
        ex.printStackTrace();
    }

    return null;
}

但是，我的 Android 应用程序崩溃，显示以下异常：

java.lang.NoSuchMethodError: No static method decodeBase64(Ljava/lang/String;)[B in class Lorg/apache/commons/codec/binary/Base64; or its super classes (declaration of 'org.apache.commons.codec.binary.Base64' appears in /system/framework/ext.jar)

因此，方法decodeBase64需要base64string，但我通过string。我的问题来了：

如何将 String 转换为 base64string ?!

请注意，我正在尝试解码而不是编码。几乎所有提供的解决方案都是针对编码部分的，这不是我担心的。

P.S.: 我正在 Android-Studio

上开发一个 Android-app

Answer 1

你检查了吗this answer

        // decode data from base 64
        private static byte[] decodeBase64(String dataToDecode)
        {
            byte[] dataDecoded = Base64.decode(dataToDecode, Base64.DEFAULT);
            return dataDecoded;
        }

       //enconde data in base 64
        private static byte[] encodeBase64(byte[] dataToEncode)
        {
            byte[] dataEncoded = Base64.encode(dataToEncode, Base64.DEFAULT);
            return dataEncoded;
        }

Answer 2

试试这个：

Base64.encodeToString(mStringToEncode.getBytes(), Base64.NO_WRAP)

它存在许多编码模式使用自动完成查看更多 Base64.NO_WRAP、Base64.CRLF 等...

您需要导入包：

import android.util.Base64;

Answer 3

public static String toBase64(String value){
    if (value == null)
        value = "";
    return Base64.encodeToString(value.trim().getBytes(), android.util.Base64.DEFAULT);
}

Answer 4

试试这个代码

private static String encryptNew(String key, String initVector, String dataToEncrypt) throws Exception{

        byte[] plainTextbytes = dataToEncrypt.getBytes("UTF-8");
        byte[] keyBytes = key.getBytes("UTF-8");
        byte[] IvkeyBytes = initVector.getBytes("UTF-8");

        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
        SecretKeySpec secretKeySpec = new SecretKeySpec(keyBytes, "AES");
        IvParameterSpec ivParameterSpec = new IvParameterSpec(IvkeyBytes);
        cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivParameterSpec);
        plainTextbytes = cipher.doFinal(plainTextbytes);
        return Base64.encodeToString(plainTextbytes, Base64.DEFAULT);
    }

    private static String decrypt(String key, String initVector, String dataToDecrypt) {
            try {

                byte[] cipheredBytes = Base64.decode(dataToDecrypt, Base64.DEFAULT);
                byte[] keyBytes = key.getBytes("UTF-8");
                byte[] IvkeyBytes = initVector.getBytes("UTF-8");

                Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
                SecretKeySpec secretKeySpecy = new SecretKeySpec(keyBytes, "AES");
                IvParameterSpec ivParameterSpec = new IvParameterSpec(IvkeyBytes);
                cipher.init(Cipher.DECRYPT_MODE, secretKeySpecy, ivParameterSpec);
                cipheredBytes = cipher.doFinal(cipheredBytes);

                return new String(cipheredBytes,"UTF-8");
            } catch (Exception ex) {
                ex.printStackTrace();
            }

            return null;
        }

Java: 如何将字符串转成base64字符串？

Java: How to convert String to base64string?

java

string

android

decode