Java TCP 连接
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Java TCP Connection
提问by user1673627
How do I create a TCP socket in Java?
如何在 Java 中创建 TCP 套接字？
How do I create such a TCP connection that it terminates only when I tell it to otherwise it remains open?
如何创建这样的 TCP 连接，使其仅在我告诉它时终止，否则它保持打开状态？
How do I use keepalives to know whether the server or client is still available?
如何使用 keepalives 来知道服务器或客户端是否仍然可用？
Please Help!
请帮忙！
回答by Peter Lawrey
How do I create a TCP socket in Java?
如何在 Java 中创建 TCP 套接字？
Socket socket = new Socket(hostname, port);
http://docs.oracle.com/javase/tutorial/networking/sockets/index.html
http://docs.oracle.com/javase/tutorial/networking/sockets/index.html
How do I create such a TCP connection that it terminates only when I tell it to otherwise it remains open?
如何创建这样的 TCP 连接，使其仅在我告诉它时终止，否则它保持打开状态？
They will remain open until either you or the other end closes it.
它们将保持打开状态，直到您或另一端将其关闭。
How do I use keepalives to know whether the server or client is still available?
如何使用 keepalives 来知道服务器或客户端是否仍然可用？
That is up to you. You can send different messages, one of which is a heartbeat which tells the other end you are alive.
那取决于你。您可以发送不同的消息，其中一个是心跳，告诉另一端您还活着。
A common thing to do if you are sending binary messages is to send the length as an unsigned short or int value. I use a message of "length" 0 as a heartbeat.
如果您发送二进制消息，通常要做的事情是将长度作为 unsigned short 或 int 值发送。我使用“长度”为 0 的消息作为心跳。
回答by Philipp
The class java.net.Socketis what you are searching for.
类java.net.Socket是您要搜索的内容。
