异步UDP如何在java中从客户端获取ip和端口?
这是我的代码:异步UDP如何在java中从客户端获取ip和端口?,java,sockets,udp,nio,channel,Java,Sockets,Udp,Nio,Channel,这是我的代码: channel = DatagramChannel.open(); socket = channel.socket(); channel.configureBlocking(false); socket.bind(new InetSocketAddress(3000)); selector = Selector.open(); channel.register(selector, SelectionK
channel = DatagramChannel.open();
socket = channel.socket();
channel.configureBlocking(false);
socket.bind(new InetSocketAddress(3000));
selector = Selector.open();
channel.register(selector, SelectionKey.OP_READ);
ByteBuffer buffer = ByteBuffer.allocate(65536);
while(true)
{
if(selector.select()>0)
{
Set<SelectionKey> selectionKeys = selector.selectedKeys();
Iterator iterator = selectionKeys.iterator();
while(iterator.hasNext())
{
SelectionKey key = (SelectionKey)iterator.next();
iterator.remove();
InetSocketAddress isa = (InetSocketAddress) channel.getRemoteAddress();
if(key.isReadable())
{
System.out.print(isa.getAddress().getHostAddress()+":"+isa.getPort());
}
}
}
}
channel=DatagramChannel.open();
socket=channel.socket();
信道配置阻塞(假);
绑定(新的InetSocketAddress(3000));
选择器=selector.open();
通道寄存器(选择器,选择键,操作读取);
ByteBuffer buffer=ByteBuffer.allocate(65536);
while(true)
{
如果(选择器.select()>0)
{
设置selectionKeys=selector.selectedKeys();
迭代器迭代器=selectionKeys.Iterator();
while(iterator.hasNext())
{
SelectionKey=(SelectionKey)迭代器.next();
iterator.remove();
InetSocketAddress isa=(InetSocketAddress)通道。getRemoteAddress();
if(key.isReadable())
{
系统输出打印(isa.getAddress().getHostAddress()+“:”+isa.getPort());
}
}
}
}
isa为空。我想获取数据包SocketAddress,比如socket.receive(数据包);但我不知道如何得到它。使用Channel.getSocketAddress()重新运行Null。UDP是一种无连接协议,因此您将无法找到通道的远程地址,因为没有这样的内容。一旦打开UDP端口进行侦听,每个人都可以向您发送消息,而无需建立直接连接。您收到的每封邮件都可能来自不同的发件人 您可以做的是检索消息的远程地址。检查方法:它将用消息填充缓冲区,并返回该特定消息的发送者的地址