Java编写多人聊天室

1.客户端

package tk.javazhangwei.net.tcp.chat.Demo03;

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.Socket;

/***
 * 创建客户端  发送数据+接收数据
 * 
 * @author zw
 *
 */
public class Client {
	public static void main(String[] args) throws IOException {
		BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
		System.out.println("请输入一个喜欢的名称：");
		String name = bf.readLine();
		if(name.equals("")) {
			return;
		}
		
		Socket client = new Socket("localhost",1025);
		//控制台输入信息
		//控制台输入信息
		new Thread(new Send(client,name)).start();//一条路径
		new Thread(new Receive(client)).start();//一条路径
}
}

2.服务端（写了个内部类：负责接收与发送多进程）

package tk.javazhangwei.net.tcp.chat.Demo03;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;



public class Server {
	List all = new ArrayList();
	
	
	
	public static void main(String[] args) throws IOException {
		new Server().start();
		

	}
	
	
	public void start() throws IOException {
		ServerSocket server = new ServerSocket(1025);
		while (true) {
			Socket socket = server.accept();
			myChannel mc = new myChannel(socket);
			Thread t = new Thread(mc);
			all.add(mc);
			t.start();
	}
}


/***
 * 一个客户端 一个通路
 * @author zw
 *
 */
class myChannel implements Runnable{
	private DataInputStream dis;
	private DataOutputStream dos;
	private boolean isRuning=true;
	private String name;
	
	public myChannel(Socket socket) throws IOException{
		try {
			dis = new DataInputStream(socket.getInputStream());
			dos = new DataOutputStream(socket.getOutputStream());
			this.name = dis.readUTF();
			send("欢迎进入聊天室");
			senOthers(this.name + "进入了聊天室");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			//e.printStackTrace();
				isRuning=false;
				dos.close();
				dis.close();
				
		}
		
	}
	/***
	 * 读取数据
	 * 
	 * @return
	 * @throws IOException
	 */
	private String receive() throws IOException {
		String msg ="";
		try {
			msg =dis.readUTF();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			//e.printStackTrace();
			isRuning=false;
			dis.close();
		
		}
		
		
		return msg;	
	}
	/***
	 * 发送数据
	 * @throws IOException 
	 */
	private void send(String msg) throws IOException {
		if(msg==null&& msg.equals("")) {
			return;
		}
		try {
			dos.writeUTF(msg);
			dos.flush();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			//e.printStackTrace();
			isRuning=false;
			dos.close();
			all.remove(this);
		}
		
	}
	/***
	 * 发送给其他客户端
	 * @throws IOException 
	 */
	private void senOthers(String msg) throws IOException {
		if (msg.startsWith("@")&&msg.indexOf(":")>-1) {// 表示为私聊
			//获取name
			String name = msg.substring(1, msg.indexOf(":"));
			String content = msg.substring(msg.indexOf(":")+1);//获取冒号后的正文
			for (myChannel others : all) {
				if(others.name.equals(name)) {
					others.send(this.name+"对您瞧瞧的说："+content);
				}
				
			}
			
			
		} else {
		//遍历容器
		for(myChannel others:all) {
			if(others == this) {//如果是本身，就跳过
				continue;
			}
			others.send(this.name+"对所有人说："+msg);
		}
		}
	}
	
	@Override
	public void run() {
		while(isRuning) {
			try {
				senOthers(receive()) ;
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			
		}
		}
}
}

3.客户端的发送与接收多进程

package tk.javazhangwei.net.tcp.chat.Demo03;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Socket;

/***
 * 发送数据
 * 
 * @author zw
 *
 */
public class Send implements Runnable{
	//控制台输入流
	private BufferedReader console;
	//管道输出流
	private DataOutputStream dos;
	private String name;
	
	private boolean isRuning =true;//线程是否运行
	
	public Send() {
		console =new BufferedReader(new InputStreamReader(System.in));
	}
	
	public Send(Socket client,String name) throws IOException {
		this();
		try {
			dos = new DataOutputStream(client.getOutputStream());
			this.name = name;
			send(name);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			//e.printStackTrace();
			 isRuning =false;
			 dos.close();
			 console.close();
		}
	}
	private String getMsgFromConsole() {
		try {
			return console.readLine();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return "";
	}
	
	
	
	
@Override
	public void run() {
		
		while(isRuning) {
			try {
				send(getMsgFromConsole());
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
	




	public void send(String msg) throws IOException {
		if (msg!=null && !msg.equals("")) {
			try {
				dos.writeUTF(msg);
				dos.flush();// 强制刷新
			} catch (IOException e) {
				// TODO Auto-generated catch block
				// e.printStackTrace();
				isRuning = false;
				dos.close();
				console.close();

			}
		}
	}

}

package tk.javazhangwei.net.tcp.chat.Demo03;

import java.io.DataInputStream;
import java.io.IOException;
import java.net.Socket;

/***
 * 接收数据
 * @author zw
 *
 */
public class Receive implements Runnable{
	//客户端的输入流
	private DataInputStream dis;
	private boolean isRuning = true;
	
	public Receive() {
	
	}
 
	public Receive(Socket client) {
		super();
		try {
			dis = new DataInputStream(client.getInputStream());
		} catch (IOException e) {
			// TODO Auto-generated catch block
			//e.printStackTrace();
			isRuning =false;
			try {
				dis.close();
			} catch (IOException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
		}
	}
	/***
	 * 接收数据
	 * @return
	 * @throws IOException 
	 */
	public String receive() throws IOException {
		String msg = "";
		try {
			msg =dis.readUTF();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			isRuning =false;
			dis.close();
		}
		
		return msg;
	}
	@Override
	public void run() {
		while(isRuning) {
			try {
				System.out.println(receive());
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		
	}

}

4.效果