Java base64 编码和解码
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时间：2020-10-31 21:21:06 来源:igfitidea点击:
Java base64 encode and decode
提问by TonyChou
I am trying to encode byte[]to String, then decode this Stringto byte[], my code is:
我正在尝试编码byte[]为String，然后将其解码String为byte[]，我的代码是：
byte[] aaa = new byte[1];
aaa[0] = (byte) 153;
String encoder = Base64.encodeBase64String(aaa);
System.out.println("encoder <<>> " + encoder);
// Decode the Base64 String.
byte[] bytes = Base64.decodeBase64(encoder);
String decoder = new String(bytes, "UTF08");
System.out.println("decoder <<>> " + decoder );
Result is:
结果是：
encoder <<>> mQ==
decoder <<>> ?
The result are not the same one. Why does this happen?
结果是不一样的。为什么会发生这种情况？
采纳答案by Ted Hopp
Try this:
试试这个：
byte[] aaa = new byte[1];
aaa[0] = (byte) 153;
System.out.println("original bytes <<>> " + Arrays.toString(aaa));
// Encode the bytes to Base64
String encoder = Base64.encodeBase64String(aaa);
System.out.println("encoder <<>> " + encoder);
// Decode the Base64 String to bytes
byte[] bytes = Base64.decodeBase64(encoder);
System.out.println("decoded bytes <<>> " + Arrays.toString(bytes));
回答by maris
simple static utility methods to encode and decode the given string.
简单的静态实用方法来编码和解码给定的字符串。
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
...
private static byte[] key = {
0x74, 0x68, 0x69, 0x73, 0x49, 0x73, 0x41, 0x53, 0x65, 0x63, 0x72, 0x65, 0x74, 0x4b, 0x65, 0x79
}; // "ThisIsASecretKey";
public static String encrypt(String stringToEncrypt) throws Exception {
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
final SecretKeySpec secretKey = new SecretKeySpec(key, "AES");
cipher.init(Cipher.ENCRYPT_MODE, secretKey);
final String encryptedString = Base64.encodeBase64String(cipher.doFinal(stringToEncrypt.getBytes()));
return encryptedString;
}
public static String decrypt(String stringToDecrypt) throws Exception {
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
final SecretKeySpec secretKey = new SecretKeySpec(key, "AES");
cipher.init(Cipher.DECRYPT_MODE, secretKey);
final String decryptedString = new String(cipher.doFinal(Base64.decodeBase64(stringToDecrypt)));
return decryptedString;
}
