问题描述
我想把指定的数据发送给指定的客户端,但是每次连接的时候客户端ID都变了,怎么办?
@Component
public class TcpMessageListener implements ApplicationListener<TcpConnectionEvent> {
public final Set<String> connectionIds;
public TcpMessageListener(Set<String> connectionIds){
this.connectionIds = connectionIds;
}
@Override
public void onApplicationEvent(TcpConnectionEvent event) {
if(event instanceof TcpConnectionopenEvent){
connectionIds.add(event.getConnectionId());
}else if(event instanceof TcpConnectionCloseEvent){
connectionIds.remove(event.getConnectionId());
}
}
}
我可以向指定的 IP 地址发送消息吗
@Component
public class TcpserverHandler {
@Autowired
private TcpMessageListener tcpMessageListener;
@Autowired
private MessageChannel tcpOutputChannel;
public void send(String type,String url) {
TcpDto tcpDto = new TcpDto(type,url);
// TcpDto tcpDto = new TcpDto("update-backgroud","http://xxx.xxxx.xx");
try {
String msg = new ObjectMapper().writeValueAsstring(tcpDto);
Set<String> connections = tcpMessageListener.connectionIds;
for (String connectionId : connections) {
Message<String> message = MessageBuilder.withPayload(msg)
.setHeader(IpHeaders.CONNECTION_ID,connectionId)
.build();
tcpOutputChannel.send(message);
}
} catch (JsonProcessingException e) {
log.error(e);
}
}
}
解决方法
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