解密成功，搞了一上午，不得不说微信开发文档真烂 SecretKeySpec key = newSecretKeySpec((MD5.encodeString(appKey, WXPayConstants.UTF8)toLowerCase().getBytes()), ALGORITHM); SecurityaddProvider(newBouncyCastleProvider()); Cipher cipher = CiphergetInstance(ALGORITHM_MODE_PADDING, "BC"; cipher.init(Cipher.DECRYPT_MODE, key); Base64.Decoder decoder = Base64getDecoder(); byte[] decryptContent = cipher.doFinal(reqInfo); returnnewString(decryptContent, "utf-8";