@PostMapping("/mediaShare")
    public AjaxResult mediaShare(@RequestBody MediaShareVo mediaShareVo) throws Exception {
        AjaxResult ajaxResult = new AjaxResult();
        MessagePayload messagePayload = TextMessageContentBuilder.newBuilder(mediaShareVo.getRemoteMediaUrl()).build();
 messagePayload.setRemoteMediaUrl(mediaShareVo.getRemoteMediaUrl());
        messagePayload.setType(ProtoConstants.ContentType.Link);//视频是8
        messagePayload.setMentionedType(3);
        messagePayload.setSearchableContent(mediaShareVo.getMediaName());

        Conversation conversation = new Conversation(ProtoConstants.ConversationType.ConversationType_Group, mediaShareVo.getTarget(), 0);
        IMResult<SendMessageResult> resultSendMessage = MessageAdmin.sendMessage(mediaShareVo.getSender(), conversation, messagePayload);
        if (resultSendMessage != null && resultSendMessage.getErrorCode() == ErrorCode.ERROR_CODE_SUCCESS) {
            ajaxResult.put("msg", "send message success");
        } else {
            ajaxResult.put("msg", "send message error ");
        }
        return ajaxResult;
    }