Java SE实现多人聊天室功能

本文实例为大家分享了java se实现多人聊天室功能的具体代码，供大家参考，具体内容如下

实现功能：

1.实现用户注册上线，下线

2.实现群聊和私聊功能

3.实现统计当前在线人数

实现思路：

1.首先，要实现服务端与客户端之间的连接

这里是使用套接字建立tcp连接：

（1）服务器端先实例化一个描述服务器端口号的serversocket对象

（2）客户端要创建socket对象来连接指定的服务器端

（3）服务器端调用serversocket类的accept()方法来监听连接到服务器端的客户端信息

（4）若服务器端与客户端连接成功，双方将返回一个socket对象，此时双方可以进行通信

（5）服务器端与客户端使用i/o流进行连接，服务端的输出流连接客户端的输入流，客户端的输出流连接服务端的输入流

（6）使用close()方法关闭套接字（一定要记得关闭）

2.因为是拥有一个服务端来实现多个客户端的连接，此处还要解决的是多线程的问题。

每个客户端需要两个线程，来分别处理向服务端发送消息和向服务端接收消息

而服务端，当每增加一个客户端与服务端连接，服务端都要多创建一个线程来处理与客户端的连接

具体代码：

单线程实现：

客户端

import java.io.ioexception;
import java.io.printstream;
import java.net.socket;
import java.util.scanner;
 
/**
 * @author lxy
 * @email [e-mail]
 * @date 2018/7/20 15:46
 */
//客户端
public class singleclient {
  public static void main(string[] args) throws ioexception {
    //客户端连接服务器，返回套接字socket对象
    socket socket = new socket("127.0.0.1",6666);
    //获取服务端的输出流，向服务器端输出内容
    printstream printstream = new printstream(socket.getoutputstream());
    printstream.println("我是客户端" + socket.getlocalport());
    //获取服务器端的输入流，读取服务器端的内容
    scanner scanner = new scanner(socket.getinputstream());
    scanner.usedelimiter("\n");
    if(scanner.hasnext())
    {
      system.out.println(scanner.next());
    }
    //关闭流
    socket.close();
  }
}

服务端

import java.io.ioexception;
import java.io.printstream;
import java.net.serversocket;
import java.net.socket;
import java.util.scanner;
 
/**
 * @author lxy
 * @email [e-mail]
 * @date 2018/7/20 15:34
 */
//服务端
public class singleserver {
  public static void main(string[] args) throws ioexception {
    //创建服务器端的serversocket对象，等待客户端进行连接
    serversocket serversocket = new serversocket(6666);
    system.out.println("服务器的端口号为6666，等待客户端连接。。。");
    //侦听并接收服务器端的连接，返回套接字socket对象
    socket socket = serversocket.accept();
    //获取客户端的输入流，读取客户端的输入内容
    scanner scanner = new scanner(socket.getinputstream());
    scanner.usedelimiter("\n");
    if(scanner.hasnext())
    {
      system.out.println("客户端发来消息：" + scanner.next());
    }
    //获取客户端的输出流，向客户端输出内容
    printstream printstream = new printstream(socket.getoutputstream());
    printstream.println("客户端你好，我是服务器端：" + serversocket.getlocalport());
    //关闭流
    serversocket.close();
  }
}

多线程实现

客户端

import java.io.ioexception;
import java.io.printstream;
import java.net.socket;
import java.util.scanner;
 
/**
 * @author lxy
 * @email [e-mail]
 * @date 2018/7/20 15:55
 */
//客户端
 
//客户端读取服务器端信息的线程
class clientreadserver implements runnable
{
  private socket socket;
 
  public clientreadserver(socket socket)
  {
    this.socket = socket;
  }
 
  public void run() {
    try {
      scanner scanner = new scanner(socket.getinputstream());
      while (scanner.hasnext())
      {
        system.out.println(scanner.next());
      }
      socket.close();
    } catch (ioexception e) {
      e.printstacktrace();
    }
  }
}
 
 
//客户端向服务端发送信息的线程
class clientsendserver implements runnable
{
  private socket socket;
 
  public clientsendserver(socket socket)
  {
    this.socket = socket;
  }
 
  public void run() {
    try {
      printstream printstream = new printstream(socket.getoutputstream());
      scanner scanner = new scanner(system.in);
      while (true)
      {
        string msg = null;
        if(scanner.hasnext())
        {
          msg = scanner.next();
          printstream.println(msg);
        }
        if(msg.equals("bye"))
        {
          scanner.close();
          printstream.close();
          break;
        }
      }
    } catch (ioexception e) {
      e.printstacktrace();
    }
 
  }
}
 
public class multiclient {
  public static void main(string[] args) throws ioexception {
    socket socket = new socket("127.0.0.1",6666);
    thread read = new thread(new clientreadserver(socket));
    thread send = new thread(new clientsendserver(socket));
    read.start();
    send.start();
  }
}

服务端

import java.io.ioexception;
import java.io.printstream;
import java.net.serversocket;
import java.net.socket;
import java.util.map;
import java.util.scanner;
import java.util.set;
import java.util.concurrent.concurrenthashmap;
import java.util.concurrent.executorservice;
import java.util.concurrent.executors;
import java.util.regex.matcher;
import java.util.regex.pattern;
 
/**
 * @author lxy
 * @email [e-mail]
 * @date 2018/7/20 16:12
 */
class server implements runnable
{
  private static map<string,socket> map = new concurrenthashmap<string, socket>();
 
  private socket socket;
 
  public server(socket socket)
  {
    this.socket = socket;
  }
 
  public void run() {
    try {
      scanner scanner = new scanner(socket.getinputstream());
      string msg = null;
      while (true)
      {
        if(scanner.hasnextline())
        {
          msg = scanner.nextline();
          pattern pattern = pattern.compile("\r");
          matcher matcher = pattern.matcher(msg);
          msg = matcher.replaceall("");
          //用户注册——格式：username:用户名
          if(msg.startswith("username:"))
          {
            string username = msg.split("\\:")[1];
            userregist(username,socket);
            continue;
          }
          //群聊——格式：g:群聊信息
          else if(msg.startswith("g:"))
          {
            firststep(socket);
            string str = msg.split("\\:")[1];
            groupchat(socket,str);
            continue;
          }
          else if(msg.startswith("p:") && msg.contains("-"))
          {
            firststep(socket);
            string username = msg.split("\\:")[1].split("-")[0];
            string str = msg.split("\\:")[1].split("-")[1];
            privatechat(socket,username,str);
            continue;
          }
          else if(msg.contains("bye"))
          {
            firststep(socket);
            userexit(socket);
            continue;
          }
          else
          {
            printstream printstream = new printstream(socket.getoutputstream());
            printstream.println("格式输入错误");
            continue;
 
          }
        }
      }
    } catch (ioexception e) {
      e.printstacktrace();
    }
 
  }
 
  private void firststep(socket socket) throws ioexception {
    set<map.entry<string,socket>> set = map.entryset();
    for(map.entry<string,socket> entry:set)
    {
      if(entry.getvalue().equals(socket))
      {
        if(entry.getvalue() == null)
        {
          printstream printstream = new printstream(socket.getoutputstream());
          printstream.println("请先进行注册操作！格式为：[username:用户名]");
        }
      }
    }
  }
 
  private void userregist(string username, socket socket) {
    map.put(username,socket);
    system.out.println("用户名：" + username + "客户端" + socket +"上线了！！");
    system.out.println("当前在线人数为" + map.size() + "人");
  }
 
  private void groupchat(socket socket, string msg) throws ioexception {
    set<map.entry<string,socket>> set = map.entryset();
    string username = null;
    for(map.entry<string,socket> entry:set)
    {
      if(entry.getvalue().equals(socket))
      {
        username = entry.getkey();
        break;
      }
    }
    for(map.entry<string,socket> entry:set)
    {
      socket client = entry.getvalue();
      printstream printstream = new printstream(client.getoutputstream());
      printstream.println(username + "说" + msg);
    }
  }
 
  private void privatechat(socket socket, string username, string msg) throws ioexception {
    string curuser = null;
    set<map.entry<string,socket>> set = map.entryset();
    for(map.entry<string,socket> entry:set)
    {
      if(entry.getvalue().equals(socket))
      {
        curuser = entry.getkey();
        break;
      }
    }
    socket client = map.get(username);
    printstream printstream = new printstream(client.getoutputstream());
    printstream.println(curuser + "私聊说" + msg);
  }
 
  private void userexit(socket socket) {
    string username = null;
    for(string key:map.keyset())
    {
      if(map.get(key).equals(socket))
      {
        username = key;
        break;
      }
    }
    map.remove(username,socket);
    system.out.println("用户" + username + "已下线");
  }
}
 
 
public class multiserver {
  public static void main(string[] args) {
    try {
      serversocket serversocket = new serversocket(6666);
      //使用线程池
      executorservice executorservice = executors.newfixedthreadpool(20);
      for(int i = 0;i < 20;i++)
      {
        system.out.println("欢迎来到聊天室。。。");
        socket socket = serversocket.accept();
        system.out.println("新人加入。。。");
        executorservice.execute(new server(socket));
      }
      executorservice.shutdown();
      serversocket.close();
    } catch (ioexception e) {
      e.printstacktrace();
    }
 
  }
}

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