socket ( java ) 简单客户端、服务端通信

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实现:

客户端：用两个socket（两个端口），一个用于接收服务端发送过来的消息，一个用于向服务端发送消息。

服务端：用两个socket，一个用于接收客户端发送过来的消息，一个用于接收消息手自动向客户端发送消息。

注：可单独运行SocketServer与SocketClient；

1、SocketServer类：

package org.jivesoftware.openfire.plugin.test;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;

public class SocketServer implements Runnable {
	public int hostPort = 5000;
	public int remotePort = 5001;
	public boolean sendMessage=false;
	public String remoteAddress="localhost";

	public static void main(String args[]){
		SocketServer socketServer=new SocketServer();
		socketServer.run();
	}
	public void run() {
		Socket socket=null;
		ServerSocket server=null;
		InputStream is=null;
		OutputStream os=null;
		try {
			 server = new ServerSocket(hostPort);
			 socket = server.accept();
			System.out.println(socket);
			is = socket.getInputStream();
			byte[] bytes;
			while (true) {
				bytes = new byte[2048];
				int n = is.read(bytes);
				System.out.print(new String(bytes, 0, n));
				if(sendMessage)
					sendMessage();
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		try {
			if (socket != null)
				socket.close();
			if(is!=null)
				is.close();
			if(os!=null)
				os.close();
			if(server!=null)
				server.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	public void sendMessage() {	
		Socket socket = null;
		OutputStream outputStream = null;
		int i = 0;
		String string = "这里是服务器。。。";
		try {
			socket = new Socket(remoteAddress, remotePort);
			outputStream = socket.getOutputStream();
			outputStream.write((string + (i++)+"\n").getBytes());
			outputStream.flush();
		} catch (UnknownHostException e1) {
			try {
				if (socket != null)
					socket.close();
				if (outputStream != null)
					outputStream.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
			System.out.println("服务器端口没开。。");
			e1.printStackTrace();
		} catch (IOException e1) {
			e1.printStackTrace();
		}
	}
}

2、SocketClient类：

package org.jivesoftware.openfire.plugin.test;

import java.io.IOException;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Date;

public class SocketClient implements Runnable {
	public static void main(String args[]) {
		SocketClient socketClient = new SocketClient();
		socketClient.run();
	}
	public int remotePort = 5000;
	public String remoteAddress = "localhost";

	public SocketClient() {
	}

	public void run() {
		Socket socket = null;
		OutputStream outputStream = null;

		try {
			socket = new Socket(remoteAddress, remotePort);
			outputStream = socket.getOutputStream();
			outputStream.write(("connect to the server at time " + new Date().toString()+"\n").getBytes());
			outputStream.flush();
			System.out.println(socket);
			byte[] buffer;
			int size = 0;
			while (true) {
				System.out.println("input:");
				buffer = new byte[2048];
				size = System.in.read(buffer);
				if (size > 0) {
					outputStream.write(new String(buffer, 0, size).getBytes());
					outputStream.flush();
				}
			}
		} catch (UnknownHostException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		try {
			if (socket != null)
				socket.close();
			if (outputStream != null)
				outputStream.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

3、TCPServer类：

package org.jivesoftware.openfire.plugin.test;

import socket.SocketServer;

public class TCPServer {
	private static SocketServer socketServer;

	public static void main(String[] args){
		socketServer = new SocketServer();
		socketServer.hostPort=5000;
		socketServer.remotePort=5001;
		socketServer.sendMessage=true;
		Thread serverThread = new Thread(socketServer);

		/*socketClient = new SocketClient();
		socketClient.remotePort=5001;
		//socketClient.setStr("TCPServer:");
		Thread clienThread = new Thread(socketClient);
		
		clienThread.start();		*/
		
		serverThread.start();
		System.out.println("服务器启动完成:");
	}
}

4、TCPClent类:

package org.jivesoftware.openfire.plugin.test;

import socket.SocketClient;
import socket.SocketServer;

public class TCPClent {
	private static SocketServer socketServer;
	private static SocketClient socketClient;

	public static void main(String[] args) {
		socketServer = new SocketServer();
		socketServer.hostPort=5001;
		socketServer.remotePort=5000;
		socketServer.sendMessage=true;
		Thread serverThread = new Thread(socketServer);

		socketClient = new SocketClient();
		socketClient.remotePort=5000;
		Thread clienThread = new Thread(socketClient);
		
		clienThread.start();
		serverThread.start();
		System.out.println("服务器启动完成:");
	}	
}

本文方法存在一些问题，其改进版，见：http://blog.csdn.net/love254443233/article/details/7897269（多线程、多客户端）