fabric java sdk有发送createchannel请求的代码吗

是的，Fabric Java SDK提供了发送Create Channel请求的代码。下面是一个示例代码片段：

// 创建HFClient对象和ChannelConfiguration对象
HFClient client = HFClient.createNewInstance();
ChannelConfiguration channelConfiguration = new ChannelConfiguration(new File(channelConfigPath));

// 从orderer获取Genesis Block
Channel channel = client.newChannel(channelName);
channel.addOrderer(client.newOrderer(ordererName, ordererUrl));
channel.initialize();

// 创建CreateChannelRequest并设置属性
CreateChannelRequest createChannelRequest = client.newCreateChannelRequest(channelName, channelConfiguration);
createChannelRequest.setOrderer(client.newOrderer(ordererName, ordererUrl));

// 发送Create Channel请求并获取响应
Collection<Orderer> orderers = new ArrayList<>();
orderers.add(client.newOrderer(ordererName, ordererUrl));
Collection<ProposalResponse> responses = client.sendTransactionProposal(createChannelRequest, channel.getPeers());
Collection<ProposalResponse> successful = new ArrayList<>();
Collection<ProposalResponse> failed = new ArrayList<>();
for (ProposalResponse response : responses) {
    if (response.getStatus() == ChaincodeResponse.Status.SUCCESS) {
        successful.add(response);
    } else {
        failed.add(response);
    }
}

其中，`channelName`为要创建的通道名称，`channelConfigPath`为通道配置文件的路径，`ordererName`和`ordererUrl`为Orderer节点的名称和URL。在发送Create Channel请求之后，可以通过`successful`和`failed`集合获取响应结果。