ClientApps/CN_Gather
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This commit is contained in:
caozehui
2026-06-08 08:47:12 +08:00
parent a4858a818e
commit 7366e7815f
3 changed files with 10 additions and 4 deletions
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4
detection/src/main/java/com/njcn/gather/detection/sntp/SntpPacketService.java
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@@ -15,6 +15,7 @@ public class SntpPacketService {
private static final int MIN_PACKET_LENGTH = 48;
private static final int CLIENT_MODE = 3;
private static final int SERVER_MODE = 4;
// NTP纪元偏移量：2208988800秒（1900年到1970年的秒数差）
private static final long NTP_EPOCH_OFFSET = 2208988800L;
private static final ZoneId SHANGHAI_ZONE = ZoneId.of("Asia/Shanghai");
private static final byte[] REFERENCE_ID = "LOCL".getBytes(StandardCharsets.US_ASCII);
@@ -54,11 +55,12 @@ public class SntpPacketService {
return response;
}
public SntpPushMessage toPushMessage(Instant computerInstant, Instant deviceInstant) {
public SntpPushMessage toPushMessage(String deviceIp, Instant computerInstant, Instant deviceInstant) {
long computerTimestampMs = computerInstant.toEpochMilli();
long deviceTimestampMs = deviceInstant.toEpochMilli();
return new SntpPushMessage(
"sntp_time_update",
deviceIp,
formatShanghaiTime(computerInstant),
formatShanghaiTime(deviceInstant),
computerTimestampMs,

2
detection/src/main/java/com/njcn/gather/detection/sntp/SntpPushMessage.java
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@@ -11,6 +11,8 @@ public class SntpPushMessage {
private String type = "sntp_time_update";
private String deviceIp;
private String computerTime;
private String deviceTime;

8
detection/src/main/java/com/njcn/gather/detection/sntp/SntpServerManager.java
View File

@@ -118,6 +118,7 @@ public class SntpServerManager {
}
private void handlePacket(DatagramSocket socket, DatagramPacket packet) throws IOException {
Instant receiveInstant = Instant.now(); //T2：服务器接收请求时间
byte[] request = Arrays.copyOf(packet.getData(), packet.getLength());
InetSocketAddress clientAddress = new InetSocketAddress(packet.getAddress(), packet.getPort());
SntpExchange exchange = sntpPacketService.parseRequest(request, clientAddress);
@@ -125,13 +126,14 @@ public class SntpServerManager {
return;
}
Instant receiveInstant = Instant.now();
Instant transmitInstant = receiveInstant;
Instant transmitInstant = Instant.now(); //T3：服务器发送响应时间
byte[] response = sntpPacketService.buildResponse(exchange, receiveInstant, transmitInstant);
DatagramPacket responsePacket = new DatagramPacket(response, response.length, packet.getAddress(), packet.getPort());
socket.send(responsePacket);
SntpPushMessage pushMessage = sntpPacketService.toPushMessage(transmitInstant, exchange.getDeviceInstant());
String deviceIp = clientAddress.getAddress().getHostAddress();
// SntpPushMessage pushMessage = sntpPacketService.toPushMessage(deviceIp, transmitInstant, exchange.getDeviceInstant());
SntpPushMessage pushMessage = sntpPacketService.toPushMessage(deviceIp, receiveInstant, exchange.getDeviceInstant());
WebServiceManager.broadcast(JSON.toJSONString(pushMessage));
}