networkservertest.java

nanjing university cs 的java课件。 对新手很有用。付课件中源码。

import java.net.*;
import java.io.*;

public class NetworkServerTest{
	public static void main(String[] args) {
		int port = 8088;
		if(args.length > 0)
			port = Integer.parseInt(args[0]);
		NetworkServer server = new NetworkServer(port, 2);
		server.listen();
	}
}

class NetworkServer{
	private int port;
	private int maxConnections;
	
	public NetworkServer(int port, int maxConnections){
		this.port = port;	
		this.maxConnections = maxConnections;
	}
	
	public int getPort(){
		return this.port;
	}
	
	public int getMaxConnections(){
		return this.maxConnections;
	}
	
	public void listen(){
		int i = 0;
		try{
			ServerSocket listener = new ServerSocket(port);
			Socket server;
			while((i++ < maxConnections) || (maxConnections == 0)){
				server = listener.accept();
				handleConnection(server);
			}
		}
		catch(IOException ioe){
			System.out.println("IOException: " + ioe);
			ioe.printStackTrace();
		}
	}
	
	void handleConnection(Socket server) throws IOException{
		PrintWriter out = SocketUtil.getPrintWriter(server);
		BufferedReader in = SocketUtil.getBufferedReader(server);
		String message = in.readLine();
		System.out.println("<< " + message);
		out.println(message);
		
		message = in.readLine();
		System.out.println("<< " + message);
		out.println(message);
		
		message = in.readLine();
		System.out.println("<< " + message);
		out.println(message);

		server.close();
	}
}

class SocketUtil{
	public static BufferedReader getBufferedReader(Socket s) throws IOException{
		return new BufferedReader(new InputStreamReader(s.getInputStream()));
	}
	
	public static PrintWriter getPrintWriter(Socket s) throws IOException{
		return new PrintWriter(s.getOutputStream(), true);
	}
}