java Socket实现多人群聊与私聊功能

本文实例为大家分享了java Socket实现多人群聊与私聊的具体代码,供大家参考,具体内容如下

关于Socket套接字的一些基本知识与认识可以参见上一篇或自行查阅。

ServerSocket和Socket实现群聊与私聊涉及到多线程编程,实现过程的重点是利用Socket通信的原理,即不断的在服务端和客户端创建输入输出流来相互传递、交换数据等以达到通信的目的。具体实现如下:

服务端:

import java.io.*;

import java.net.*;

import java.util.HashMap;

import java.util.Map;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

import java.util.concurrent.ThreadPoolExecutor;

public class TCPServer {

private ServerSocket serverSocket;

/**

* 创建线程池来管理客户端的连接线程

* 避免系统资源过度浪费

*/

private ExecutorService exec;

// 存放客户端之间私聊的信息

private Map<String,PrintWriter> storeInfo;

public TCPServer() {

try {

serverSocket = new ServerSocket(6789);

storeInfo = new HashMap<String, PrintWriter>();

exec = Executors.newCachedThreadPool();

} catch (Exception e) {

e.printStackTrace();

}

}

// 将客户端的信息以Map形式存入集合中

private void putIn(String key,PrintWriter value) {

synchronized(this) {

storeInfo.put(key, value);

}

}

// 将给定的输出流从共享集合中删除

private synchronized void remove(String key) {

storeInfo.remove(key);

System.out.println("当前在线人数为:"+ storeInfo.size());

}

// 将给定的消息转发给所有客户端

private synchronized void sendToAll(String message) {

for(PrintWriter out: storeInfo.values()) {

out.println(message);

}

}

// 将给定的消息转发给私聊的客户端

private synchronized void sendToSomeone(String name,String message) {

PrintWriter pw = storeInfo.get(name); //将对应客户端的聊天信息取出作为私聊内容发送出去

if(pw != null) pw.println(message);

}

public void start() {

try {

while(true) {

System.out.println("等待客户端连接... ... ");

Socket socket = serverSocket.accept();

// 获取客户端的ip地址

InetAddress address = socket.getInetAddress();

System.out.println("客户端:“" + address.getHostAddress() + "”连接成功! ");

/**

* 启动一个线程,由线程来处理客户端的请求,这样可以再次监听

* 下一个客户端的连接

*/

exec.execute(new ListenrClient(socket)); //通过线程池来分配线程

}

} catch(Exception e) {

e.printStackTrace();

}

}

/**

* 该线程体用来处理给定的某一个客户端的消息,循环接收客户端发送

* 的每一个字符串,并输出到控制台

*/

class ListenrClient implements Runnable {

private Socket socket;

private String name;

public ListenrClient(Socket socket) {

this.socket = socket;

}

// 创建内部类来获取昵称

private String getName() throws Exception {

try {

//服务端的输入流读取客户端发送来的昵称输出流

BufferedReader bReader = new BufferedReader(

new InputStreamReader(socket.getInputStream(), "UTF-8"));

//服务端将昵称验证结果通过自身的输出流发送给客户端

PrintWriter ipw = new PrintWriter(

new OutputStreamWriter(socket.getOutputStream(), "UTF-8"),true);

//读取客户端发来的昵称

while(true) {

String nameString = bReader.readLine();

if ((nameString.trim().length() == 0) || storeInfo.containsKey(nameString)) {

ipw.println("FAIL");

} else {

ipw.println("OK");

return nameString;

}

}

} catch(Exception e) {

throw e;

}

}

@Override

public void run() {

try {

/*

* 通过客户端的Socket获取客户端的输出流

* 用来将消息发送给客户端

*/

PrintWriter pw = new PrintWriter(

new OutputStreamWriter(socket.getOutputStream(), "UTF-8"), true);

/*

* 将客户昵称和其所说的内容存入共享集合HashMap中

*/

name = getName();

putIn(name, pw);

Thread.sleep(100);

// 服务端通知所有客户端,某用户上线

sendToAll("[系统通知] “" + name + "”已上线");

/*

* 通过客户端的Socket获取输入流

* 读取客户端发送来的信息

*/

BufferedReader bReader = new BufferedReader(

new InputStreamReader(socket.getInputStream(), "UTF-8"));

String msgString = null;

while((msgString = bReader.readLine()) != null) {

// 检验是否为私聊(格式:@昵称:内容)

if(msgString.startsWith("@")) {

int index = msgString.indexOf(":");

if(index >= 0) {

//获取昵称

String theName = msgString.substring(1, index);

String info = msgString.substring(index+1, msgString.length());

info = name + ":"+ info;

//将私聊信息发送出去

sendToSomeone(theName, info);

continue;

}

}

// 遍历所有输出流,将该客户端发送的信息转发给所有客户端

System.out.println(name+":"+ msgString);

sendToAll(name+":"+ msgString);

}

} catch (Exception e) {

// e.printStackTrace();

} finally {

remove(name);

// 通知所有客户端,某某客户已经下线

sendToAll("[系统通知] "+name + "已经下线了。");

if(socket!=null) {

try {

socket.close();

} catch(IOException e) {

e.printStackTrace();

}

}

}

}

}

public static void main(String[] args) {

TCPServer server = new TCPServer();

server.start();

}

}

客户端:

import java.io.*;

import java.net.*;

import java.util.Scanner;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

import java.util.concurrent.ThreadPoolExecutor;

public class TCPClient {

static private Socket clientSocket;

public TCPClient() {}

public static void main(String[] args) throws Exception {

Scanner scanner = new Scanner(System.in);

String serverIP;

System.out.println("请设置服务器IP:");

serverIP = scanner.next();

clientSocket = new Socket(serverIP, 6789);

TCPClient client = new TCPClient();

client.start();

}

public void start() {

try {

Scanner scanner = new Scanner(System.in);

setName(scanner);

// 接收服务器端发送过来的信息的线程启动

ExecutorService exec = Executors.newCachedThreadPool();

exec.execute(new ListenrServser());

// 建立输出流,给服务端发信息

PrintWriter pw = new PrintWriter(

new OutputStreamWriter(clientSocket.getOutputStream(), "UTF-8"), true);

while(true) {

pw.println(scanner.nextLine());

}

} catch(Exception e) {

e.printStackTrace();

} finally {

if (clientSocket !=null) {

try {

clientSocket.close();

} catch(IOException e) {

e.printStackTrace();

}

}

}

}

private void setName(Scanner scan) throws Exception {

String name;

//创建输出流

PrintWriter pw = new PrintWriter(

new OutputStreamWriter(clientSocket.getOutputStream(), "UTF-8"),true);

//创建输入流

BufferedReader br = new BufferedReader(

new InputStreamReader(clientSocket.getInputStream(),"UTF-8"));

while(true) {

System.out.println("请创建您的昵称:");

name = scan.nextLine();

if (name.trim().equals("")) {

System.out.println("昵称不得为空");

} else {

pw.println(name);

String pass = br.readLine();

if (pass != null && (!pass.equals("OK"))) {

System.out.println("昵称已经被占用,请重新输入:");

} else {

System.out.println("昵称“"+name+"”已设置成功,可以开始聊天了");

break;

}

}

}

}

// 循环读取服务端发送过来的信息并输出到客户端的控制台

class ListenrServser implements Runnable {

@Override

public void run() {

try {

BufferedReader br = new BufferedReader(

new InputStreamReader(clientSocket.getInputStream(), "UTF-8"));

String msgString;

while((msgString = br.readLine())!= null) {

System.out.println(msgString);

}

} catch(Exception e) {

e.printStackTrace();

}

}

}

}

运行结果:

开始自己的实现也不是很完整,后来也是借鉴别人比较好的思想后完善的,权当分享。

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