Java AES/CBC解密后的初始字節不正確下面的例子有什么問題？問題是解密字符串的第一部分是無意義的。不過，其余的都沒問題，我.Result: `￡eB6O?geS??i are you? Have a nice day.@Testpublic void testEncrypt() {   try {     String s = "Hello there. How are you? Have a nice day.";     // Generate key     KeyGenerator kgen = KeyGenerator.getInstance("AES");     kgen.init(128);     SecretKey aesKey = kgen.generateKey();     // Encrypt cipher     Cipher encryptCipher = Cipher.getInstance("AES/CBC/PKCS5Padding");     encryptCipher.init(Cipher.ENCRYPT_MODE, aesKey);     // Encrypt     ByteArrayOutputStream outputStream = new ByteArrayOutputStream();     CipherOutputStream cipherOutputStream = new CipherOutputStream(outputStream, encryptCipher);     cipherOutputStream.write(s.getBytes());     cipherOutputStream.flush();     cipherOutputStream.close();     byte[] encryptedBytes = outputStream.toByteArray();     // Decrypt cipher     Cipher decryptCipher = Cipher.getInstance("AES/CBC/PKCS5Padding");     IvParameterSpec ivParameterSpec = new IvParameterSpec(aesKey.getEncoded());     decryptCipher.init(Cipher.DECRYPT_MODE, aesKey, ivParameterSpec);     // Decrypt     outputStream = new ByteArrayOutputStream();     ByteArrayInputStream inStream = new ByteArrayInputStream(encryptedBytes);     CipherInputStream cipherInputStream = new CipherInputStream(inStream, decryptCipher);     byte[] buf = new byte[1024];     int bytesRead;     while ((bytesRead = cipherInputStream.read(buf)) >= 0) {         outputStream.write(buf, 0, bytesRead);     }     System.out.println("Result: " + new String(outputStream.toByteArray()));   }    catch (Exception ex) {     ex.printStackTrace();   }}