比如用的 FastJson 库： @Test public void decryptPayCallbackContentTest() throws GeneralSecurityException, IOException { String content = "{\"id\":\"f00e26a0-d255-5bfd-8f0d-a0275df040ad\",\"create_time\":\"2021-09-30T16:08:53+08:00\",\"resource_type\":\"encrypt-resource\",\"event_type\":\"TRANSACTION.SUCCESS\",\"summary\":\"支付成功\",\"resource\":{\"original_type\":\"transaction\",\"algorithm\":\"AEAD_AES_256_GCM\",\"ciphertext\":\"lZr3KNzyREUwOpGTp8******ncWT3t1n0eU20wdk=\",\"associated_data\":\"transaction\",\"nonce\":\"cji332epFsZO\"}}"; JSONObject parseObject = JSON.parseObject(content); JSONObject resourceObject = parseObject.getJSONObject("resource"); AesUtil aesUtil = new AesUtil(apiV3Key.getBytes(StandardCharsets.UTF_8)); // 这里很重要 String transaction = resourceObject.getString("associated_data"); String nonceStr = resourceObject.getString("nonce"); String cipherText = resourceObject.getString("ciphertext"); Assertions.assertThrows(AEADBadTagException.class, () -> { // 错误的做法 aesUtil.decryptToString(resourceObject.getBytes("associated_data"), resourceObject.getBytes("nonce"), resourceObject.getString("ciphertext")); }); Assertions.assertDoesNotThrow(() -> { // 对的做法 aesUtil.decryptToString(transaction.getBytes(StandardCharsets.UTF_8), nonceStr.getBytes(StandardCharsets.UTF_8), cipherText); }); }

[图片]为了解决这个问题，把微信文档都翻了一遍，没找到详细的签名过程，反正是没找到，然后百度各种关键词， 此贴刚好没排在搜索前排，然后各种尝试。当返回成功的时候，发现就是这么简单的几句代码，卧槽。希望你没遇到这问题。