Java Socket实现聊天室附1500行源代码

package Dao;


public class UserLinkList {
	private  node head;
	private int count;

	public boolean addUser(Node client)
	{
		if(head == null)
		{//头节点也存储数据
			head = client;
			count++;
			return true;
		}
		else {
			Node p = head;
			for(;p.next != null;p = p.next);
			{
				p.next = client;
				count++;
				return true;
			}
		}
	}
	
	public int getCount() {
		return count;
	}
	
	public Node findUser(String name)
	{
		Node p = head;
		while(p != null )//p.next != null没有包含最后一个结点
		{
			if(p.username.equals(name))
			{
				return p;
			}
			p = p.next;
		}
		return null;
	}
	
	public Node findUser(int index)
	{
		int pos = 0;
		Node p = head;
		while(p != null&& pos < index)
		{
			p = p.next;
			pos++;
		}
		if(p != null&& pos == index)
		{
			return p;
		}
		return null;
	}
	
	public boolean delUser(Node client)
	{//删除后长度也要减少
		Node p = head;
		if(p.username.equals(client.username))
		{//删除头结点
			head = head.next;
			count--;
			return true;
		}
		while(p != null)
		{//忘记循环了
			if(p.next.username.equals(client.username))
			{
				p.next = p.next.next;
				count--;
				return true;
			}
			p = p.next;
		}
		return false;
	}
	
	
	public void display() {
		Node p = head;
		int pos = 1;
		while(p != null)
		{
			System.out.println("第"+pos + "个用户"+p.username);
			p = p.next;
			pos++;
		}
	}
}

package Server;


import java.io.*;
import java.net.*;
import Dao.*; //连接数据
import javax.swing.*;

public class ServerListen extends Thread{
	ServerSocket server;
	JComboBox combobox;
	JTextArea textarea;
	JTextField textfield;
	UserLinkList userLinkList;
	Node client;
	ServerReceive recvThread;
	public boolean isStop;
	
	public ServerListen(ServerSocket server,JComboBox combobox,JTextArea textarea,JTextField textField,UserLinkList userLinkList) {
		this.server = server;
		this.combobox = combobox;
		this.textarea = textarea;
		this.textfield = textField;
		this.userLinkList = userLinkList;
		isStop = false;
	}
	@Override
	public void run() {
		while(!isStop && !server.isClosed())//没有停止服务
		{
			try {
				client = new Node();
				client.socket = server.accept();//用来指代所连接的客户端
				client.output = new ObjectOutputStream(client.socket.getOutputStream());
				client.output.flush();
				client.input = new ObjectInputStream(client.socket.getInputStream());
				client.username = (String)client.input.readObject();
				//显示提示信息
			    combobox.addItem(client.username);//改成用户名
			    userLinkList.addUser(client);
			    textarea.append("用户" + client.username+"上线"+"\n");
			    textfield.setText("在线用户"+ userLinkList.getCount()+"人\n");
			    
			    recvThread = new ServerReceive(textarea,textfield,combobox,client,userLinkList);
			    recvThread.start();//启动线程
			}catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
}

package Server;


import java.net.ServerSocket;

import javax.swing.*;
import Dao.*;

public class ServerReceive extends Thread{
	JTextArea textarea;//消息展示域
	JTextField textfield;//文本输入域
	JComboBox combobox; //复选框
	Node client;//用户
	UserLinkList userLinkList;
	public boolean isStop;
	public ServerReceive(JTextArea textarea, JTextField textfield, JComboBox combobox, Node client,
			UserLinkList userLinkList) {
		this.textarea = textarea;
		this.textfield = textfield;
		this.combobox = combobox;
		this.client = client;
		this.userLinkList = userLinkList;
		isStop = false;
	}
	
	@Override
	public void run()
	{
		//向所有人发送用户的列表
		sendUserList();
		while(!isStop && !client.socket.isClosed())
		{
			try {//类型，对谁，状况，行为，信息
				String type = (String)client.input.readObject();
				if(type.equalsIgnoreCase("聊天信息"))
				{
					String toSomebody =(String)client.input.readObject();//从客户端接收信息
					String status = (String)client.input.readObject();
					String action = (String)client.input.readObject();
					String message = (String)client.input.readObject();
					String msg = client.username+" "+ action + "对"+ toSomebody +" 说 " + message + "\n";//接收的消息
					if(status.equalsIgnoreCase("悄悄话"))
					{
						msg = "[悄悄话]" + msg; //若为悄悄话，就在前面加上标识
					}
					textarea.append(msg);
					if(toSomebody.equalsIgnoreCase("所有人"))
					{
						sendToAll(msg);//这里是接受的用户消息,和之前的向所有人发消息不一样
					}
					else {//向用户发消息
						try {
							client.output.writeObject("聊天信息");
							client.output.flush();//刷新流
							client.output.writeObject(msg);
							client.output.flush();
						}catch (Exception e) {
							e.printStackTrace();
						}
						Node node = userLinkList.findUser(toSomebody);
						if(node != null)
						{
							node.output.writeObject("聊天信息");
							node.output.flush();
							node.output.writeObject(msg);//向选定信息发送信息
							node.output.flush();//刷新输出流缓冲区中的信息
						}
					}
			    }
				else if(type.equalsIgnoreCase("用户下线"))
				{
					Node node = userLinkList.findUser(client.username);
					userLinkList.delUser(node);
					String msg = "用户"+ client.username +"下线\n";
					int count = userLinkList.getCount();
					combobox.removeAllItems();
					combobox.addItem("所有人");
					int i = 0;
				    while(i < count)
				    {
				    	node = userLinkList.findUser(i);
				    	if(node == null)
				    	{
				    		i++;
				    		continue;
				    	}
				    	combobox.addItem(node.username);
				    	i++;
				    }
					combobox.setSelectedIndex(0);//选择第一个，所有人
					textarea.append(msg);
					textfield.setText("在线用户"+ userLinkList.getCount() +"人\n");
					
					sendToAll(msg);
					sendUserList();//重新发送用户列表
					break;
				}
		    }catch (Exception e) {
				e.printStackTrace();
			}
	    }
	}
	
	public void sendToAll(String msg)
	{
		int count = userLinkList.getCount();
		int i = 0;
		while(i < count)
		{//给用户列表中的每一个人都发送消息
			Node node = userLinkList.findUser(i);
			if(node == null)
			{
				i++;
				continue;
			}
			try {//输出流
				node.output.writeObject("聊天信息");
				node.output.flush();
				node.output.writeObject(msg);//聊天消息写入输出流(to client)
				node.output.flush();
			}catch (Exception e) {
				e.printStackTrace();
			}
			i++;
		}
	}
	
	public void sendUserList() {
		String userList = "";
		int count = userLinkList.getCount();
		int i = 0;
		while(i < count)
		{
			Node node = userLinkList.findUser(i);
			if(node == null)
			{
				i++;
				continue;
			}
			userList += node.username;
			userList += "\n";
			i++;
		}
		i = 0; //给每个人发送消息
		while(i < count)
		{
			Node node = userLinkList.findUser(i);
			if(node == null)
			{
				i++;
				continue;
			}
			try {
				node.output.writeObject("用户列表");
				node.output.flush();
				node.output.writeObject(userList);
				node.output.flush();
			}catch (Exception e) {
				e.printStackTrace();
			}
		}
		i++;
	}	
}

package Client;

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

import javax.swing.*;

public class ClientReceive extends Thread{
	private JComboBox combobox;
	private JTextArea textarea;
	Socket socket;
	ObjectOutputStream output;
	ObjectInputStream input;
	JTextField showStatus;
	public ClientReceive(JComboBox combobox, JTextArea textarea, Socket socket, ObjectOutputStream output,
			ObjectInputStream input, JTextField showStatus) {
		this.combobox = combobox;
		this.textarea = textarea;
		this.socket = socket;
		this.output = output;
		this.input = input;
		this.showStatus = showStatus;
	}
	
	@Override
	public void run() {//从服务端获得消息
		while(!socket.isClosed())
		{
			try {
				String type = (String)input.readObject();//获得流，read读取信息
				if(type.equalsIgnoreCase("系统信息"))
				{
					String sysmsg = (String)input.readObject();
					textarea.append("系统信息" + sysmsg);
				}
				else if(type.equalsIgnoreCase("服务关闭"))
				{
					output.close();
					input.close();
					socket.close();
					textarea.append("服务器已经关闭!\n");
					break;
				}
				else if(type.equalsIgnoreCase("聊天信息"))
				{
					String message = (String)input.readObject();
					textarea.append(message);
				}
				else if(type.equalsIgnoreCase("用户列表"))
				{
					String userlist = (String)input.readObject();
					String[] usernames = userlist.split("\n"); //用换行符分隔
					combobox.removeAll();//先移出去
					int i = 0;
					combobox.addItem("所有人");
					while(i < usernames.length)
					{
						combobox.addItem(usernames[i]);
						i++;
					}
					combobox.setSelectedIndex(0);
					showStatus.setText("在线用户"+ usernames.length +" 人");
				}
			}catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
}