JAVA 即时网络通信我的服务器

以前上Java课的时候，老师要求，自行组队来做一个即时网络通信的课程设计。具体要求：使用Socket套接字和ServerSocket来开发一个基于c/s架构的小项目，服务器和客户端的UI采用Swing编程，具体业务逻辑采用多线程开发。现在过去这么久了，想去回忆一下，记录一下当时的点滴，作为一点点积累。我正在努力回忆..

我主要负责，服务器的设计开发，下面是我的部分代码。

一，UI部分是模仿别人写的，可自行设计。

二，业务部分（多线程处理）

1.线程管理类

package com.haoyudian.server.service;

import java.io.IOException;
import java.net.Inet4Address;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import com.haoyudian.common.util.Constants;
import com.haoyudian.common.util.DateHelper;

/**
 * 服务器管理类 接受用户登录、离线、转发消息
 * 
 * @author Scherrer
 * 
 */
public class ServerManager {

    private ExecutorService executorService;// 线程池
    private ServerSocket serverSocket = null;
    private Socket socket;
    private Boolean isStart = true;

    public ServerManager() {
        try {
            // 创建线程池，池中具有(cpu个数*50)条线程
            executorService = Executors.newFixedThreadPool(Runtime.getRuntime()
                    .availableProcessors() * 50);
            serverSocket = new ServerSocket(Constants.SERVER_PORT);
            System.out.println("服务器IP="
                    + Inet4Address.getLocalHost().getHostAddress());
        } catch (Exception e) {
            e.printStackTrace();
            exit();
        }
    }

    /**
     * 退出方法
     */
    private void exit() {
        try {
            this.isStart = false;
            serverSocket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    public void start() {
        System.out.println(DateHelper.getDateByCN() + " 服务器已启动...");
        try {
            while(isStart) {
                socket = serverSocket.accept();
                String ip =  socket.getRemoteSocketAddress().toString();
                System.out.println(DateHelper.getDateByCN()
                        + " 用户：" + ip + " 已建立连接");
                // 为支持多用户并发访问，采用线程池管理每一个用户的连接请求
                if (socket.isConnected()) {
                    executorService.execute(new SocketTask(socket));// 添加到线程池
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (socket != null)
                    socket.close();
                if (serverSocket != null)
                    serverSocket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    
    private final class SocketTask implements Runnable  {

        private Socket socket = null;
        private InputThread inThread;
        private OutputThread outThread;
        private OutputThreadMap threadMap;
        
        public SocketTask(Socket socket) {
            this.socket = socket;
            threadMap = OutputThreadMap.getInstance();
        }
        
        @Override
        public void run() {
            outThread = new OutputThread(socket);//
            // 先实例化写消息线程,（把对应用户的写线程存入map缓存器中）
            inThread = new InputThread(socket, outThread, threadMap);// 再实例化读消息线程
            outThread.setStart(true);
            inThread.setStart(true);
            inThread.start();
            outThread.start();
        }
        
    }
    
    public static void main(String[] args) {
        new ServerManager().start();
    }
}

2.发送消息的线程

package com.haoyudian.server.service;

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

import com.haoyudian.common.bean.trans.TransObject;

/**
 * 发送消息的线程
 * 
 * @author Scherrer
 *
 */
public class OutputThread extends Thread{

    private ObjectOutputStream oos;//对象输出流
    private TransObject<?> object;//传输对象
    private boolean isStart = true;//循环标志
    private Socket socket;//套接字
    //private OutputThreadMap outMap;//发送现场缓存对象
    
    public OutputThread(Socket s) {
        try {
            this.socket = s;
            //构造器里实例化对象输出流
            oos = new ObjectOutputStream(this.socket.getOutputStream());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     *  调用写消息线程，设置了消息之后，唤醒run方法，可以节约资源
     * @param object
     */
    public void setMessage(TransObject<?> object) {
        this.object = object;
        synchronized(this) {
            notify();
        }
    }

    public void setStart(boolean isStart) {
        this.isStart = isStart;
    }

    @Override
    public void run() {
        try {
            while(isStart) {
                //没有消息写的时候，线程等待
                synchronized (this) {
                    wait();
                }
                if (object != null) {
                    oos.writeObject(object);
                    oos.flush();
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (oos != null) {
                    oos.close();
                }
                if (socket != null) {
                    socket.close();
                }
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        
    }
    
    
}

3.接受消息的线程

package com.haoyudian.server.service;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.net.Socket;
import java.util.List;

import com.haoyudian.common.bean.TextMessage;
import com.haoyudian.common.bean.User;
import com.haoyudian.common.bean.trans.TransObject;
import com.haoyudian.common.bean.trans.TransObjectType;
import com.haoyudian.common.util.DateHelper;
import com.haoyudian.server.dao.UserDao;
import com.haoyudian.server.dao.UserDaoFactory;

public class InputThread extends Thread{

    private ObjectInputStream ois;//对象读入流
    private Socket socket;//socket对象
    private OutputThread outThread;//把接收的消息发送给用户
    private OutputThreadMap map;//写消息的缓存器
    private boolean isStart = true;
    
    public InputThread(Socket socket,OutputThread out,OutputThreadMap map) {
        try {
            this.socket = socket;
            this.outThread = out;
            this.map = map;
            this.ois = new ObjectInputStream(socket.getInputStream());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    public void setStart(boolean isStart) {// 提供接口给外部关闭读消息线程
        this.isStart = isStart;
    }

    @Override
    public void run() {
        try {
            while(isStart) {
                //读消息
                try {
                    readMessage();
                } catch (Exception e) {
                    //e.printStackTrace();
                    break;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (ois != null) {
                    ois.close();
                }
                if (socket != null) {
                    socket.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        
    }

    private void readMessage() throws IOException, ClassNotFoundException {
        Object readObj = ois.readObject();//读取消息对象
        UserDao dao = UserDaoFactory.getInstance();// 通过dao模式管理后台
        if (readObj != null && readObj instanceof TransObject) {
            TransObject<?> transObj = (TransObject<?>) readObj;//转换成传输对象
            switch (transObj.getType()) {
            case REGISTER://注册
                User user = (User) transObj.getObject();
                int regAccout = dao.register(user);
                System.out.println(DateHelper.getDateByCN() +
                        "新用户注册： " + regAccout);
                //回复用户
                TransObject<User> regResult = new 
                        TransObject<User>(TransObjectType.REGISTER);
                User u = new User();
                u.setAccount(regAccout);
                regResult.setObject(u);
                System.out.println("验证一下账号： " + u.getAccount());
                outThread.setMessage(regResult);
                break;
            case LOGIN:
                User loginUser = (User) transObj.getObject();
                List<User> list = dao.login(loginUser);
                System.out.println("好友列表： " + list.size());
                //返回 list
                TransObject<List<User>> msg = new TransObject<>(TransObjectType.LOGIN);
                
                if (list != null ) {//登陆成功
                    TransObject<User> userOnlineMsg = new 
                            TransObject<User>(TransObjectType.LOGIN);
                    //此处 new 一个User ，只广播用户账号，如果用loginUser，则可能泄露密码
                    User tempUser = new User();
                    tempUser.setAccount(loginUser.getAccount());
                    //tempUser.setNickname(nickname)//考虑广播昵称
                    userOnlineMsg.setObject(tempUser);
                    for(OutputThread out : map.getAll()) {//拿到所有用户的发送线程 
                        out.setMessage(userOnlineMsg);
                    }
                    //记录当前用户的发送线程
                    map.add(loginUser.getAccount(), outThread);
                    //设置消息
                    msg.setObject(list);
                } 
                //发送
                outThread.setMessage(msg);
                System.out.println(DateHelper.getDateByCN() + " 用户："
                        + loginUser.getAccount() + " 上线了");
                break;
            case MESSAGE:
                // 如果是转发消息（可添加群发）
                // 获取消息中要转发的对象id，然后获取缓存的该对象的写线程
                int toAccount = transObj.getToUser().getAccount();//获取账号
                OutputThread ot = map.getById(toAccount);//获取发送线程
                if (ot != null) {
                    ot.setMessage(transObj);//把接收到的消息对象直接发送给另一个用户
                } else {//用户的缓存发送线程为空，表示表示用户已下线，回复用户
                    TextMessage text = new TextMessage();
                    text.setTextMessage("对方离线，您的消息暂时保存在服务器");
                    TransObject<TextMessage> msgTip = 
                            new TransObject<>(TransObjectType.MESSAGE);
                    msgTip.setObject(text);
                    User tempU = new User();
                    tempU.setAccount(0);
                    msgTip.setFromUser(tempU);
                    outThread.setMessage(msgTip);
                }
                break;
            case LOGOUT://下线处理
                // 如果是退出，更新数据库在线状态，同时群发告诉所有在线用户
                User logoutUser = (User) transObj.getObject();
                System.out.println(DateHelper.getDateByCN() 
                        + "用户： " + logoutUser.getNickname() + "下线了哈");
                dao.logout(logoutUser);
                //结束自己的读消息的线程
                isStart = false;
                //移除自己的缓存线程
                map.remove(logoutUser.getAccount());
                outThread.setMessage(null);// 先要设置一个空消息去唤醒写线程
                outThread.setStart(false);// 再结束写线程循环
                
                TransObject<User> offObject = new TransObject<User>(
                        TransObjectType.LOGOUT);
                User logout2User = new User();
                logout2User.setAccount(logoutUser.getAccount());
                offObject.setObject(logout2User);
                for (OutputThread offOut : map.getAll()) {// 广播用户下线消息
                    offOut.setMessage(offObject);
                }
                break;
            case Refresh_FRIEND_LIST://更新好友
                List<User> refreshList = 
                    dao.refreshFriendList(transObj.getFromUser().getAccount());
                TransObject<List<User>> refreshMsg 
                = new TransObject<>(TransObjectType.Refresh_FRIEND_LIST);
                refreshMsg.setObject(refreshList);
                outThread.setMessage(refreshMsg);
                break;
            }
        }
    }
    
    
}

 其中，线程池那部分的使用，我觉得很有用，我要特别留意一下

    public ServerManager() {
        try {
            // 创建线程池，池中具有(cpu个数*50)条线程
            executorService = Executors.newFixedThreadPool(Runtime.getRuntime()
                    .availableProcessors() * 50);
            serverSocket = new ServerSocket(Constants.SERVER_PORT);
            System.out.println("服务器IP="
                    + Inet4Address.getLocalHost().getHostAddress());
        } catch (Exception e) {
            e.printStackTrace();
            exit();
        }
    }

try {
            while(isStart) {
                socket = serverSocket.accept();
                String ip =  socket.getRemoteSocketAddress().toString();
                System.out.println(DateHelper.getDateByCN()
                        + " 用户：" + ip + " 已建立连接");
                // 为支持多用户并发访问，采用线程池管理每一个用户的连接请求
                if (socket.isConnected()) {
                    executorService.execute(new SocketTask(socket));// 添加到线程池
                }
            }
        }