如何创建一个基本的 Java Server？
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How to create a basic Java Server?
提问by IApp
Essentially I want a basic Java Server which multiple people can be connected to and when one of the connected clients (Already coded in Obj-c) sends data to it, it sends it back to everyone who is connected.
本质上，我想要一个基本的 Java 服务器，它可以连接到多个人，并且当其中一个连接的客户端（已在 Obj-c 中编码）向它发送数据时，它将数据发送回每个连接的人。
I'm a real Java Newbie and I'm not going to need Java in the forseeable future for anything but this so I want it out the way as soon as possible rather than learning Java properly from scratch. So if anyone has some source code for this or perhaps a tutorial it would be greatly appreciated.
我是一个真正的 Java 新手，在可预见的未来，除此之外我不会需要 Java，所以我希望尽快摆脱它，而不是从头开始正确学习 Java。因此，如果有人对此有一些源代码或教程，我们将不胜感激。
Thanks :) Ozzie
谢谢 :) 奥兹
采纳答案by David Titarenco
Here is a simple "Knock Knock" server courtesy of Sun:
这是 Sun 提供的一个简单的“Knock Knock”服务器：
import java.net.*;
import java.io.*;
public class KnockKnockServer {
public static void main(String[] args) throws IOException {
ServerSocket serverSocket = null;
try {
serverSocket = new ServerSocket(4444);
} catch (IOException e) {
System.err.println("Could not listen on port: 4444.");
System.exit(1);
}
Socket clientSocket = null;
try {
clientSocket = serverSocket.accept();
} catch (IOException e) {
System.err.println("Accept failed.");
System.exit(1);
}
PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
BufferedReader in = new BufferedReader(
new InputStreamReader(
clientSocket.getInputStream()));
String inputLine, outputLine;
KnockKnockProtocol kkp = new KnockKnockProtocol();
outputLine = kkp.processInput(null);
out.println(outputLine);
while ((inputLine = in.readLine()) != null) {
outputLine = kkp.processInput(inputLine);
out.println(outputLine);
if (outputLine.equals("Bye."))
break;
}
out.close();
in.close();
clientSocket.close();
serverSocket.close();
}
}
You can't get much simpler than this.
没有比这更简单的了。
回答by Keith Adler
I would start by looking at multicasting in Java:
我将首先研究 Java 中的多播：
http://java.sun.com/docs/books/tutorial/networking/datagrams/broadcasting.html
http://java.sun.com/docs/books/tutorial/networking/datagrams/broadcasting.html
回答by clamp
you will probably need to use the serversocketclass.
您可能需要使用serversocket类。
回答by JorgeO
I did a Java program that basically implemented a sort of chat between a client and a server. Used a socket to open up a port of the server that would hear incoming connections. You should have a thread hearing them and calling actions when ever a valid connection would come in.
我做了一个 Java 程序，它基本上实现了客户端和服务器之间的一种聊天。使用套接字打开服务器的端口，该端口将听到传入的连接。您应该有一个线程可以听到它们并在有效连接进入时调用操作。
回答by Philippe
Try using the Jetty server API. http://wiki.eclipse.org/Jetty/Tutorial/Embedding_Jettylooks like a good starting point...
尝试使用 Jetty 服务器 API。http://wiki.eclipse.org/Jetty/Tutorial/Embedding_Jetty看起来是一个很好的起点......
回答by Adam MacLeod
There is a straightforward tutorial available via Sun:
Sun 提供了一个简单的教程：
http://java.sun.com/developer/onlineTraining/Programming/BasicJava2/socket.html#server
http://java.sun.com/developer/onlineTraining/Programming/BasicJava2/socket.html#server
It starts with a basic single thread as above and extends to use multiple as required.
它从一个基本的单线程开始，并根据需要扩展到使用多个。
