Java实现NIO聊天室的示例代码(群聊+私聊)

功能介绍

功能:群聊+私发+上线提醒+下线提醒+查询在线用户

文件

utils

需要用maven导入下面两个包

 <dependency>
            <groupid>org.projectlombok</groupid>
            <artifactid>lombok</artifactid>
            <version>1.16.18</version>
        </dependency>
        <dependency>
            <groupid>ch.qos.logback</groupid>
            <artifactid>logback-classic</artifactid>
            <version>1.2.3</version>
        </dependency>

package moremorechat_nio;

import lombok.extern.slf4j.slf4j;

import java.io.*;

/**
 * @author mazouri
 * @create 2021-05-09 22:26
 */
@slf4j
public class utils {
    /**
     * 将二进制数据转为对象
     *
     * @param buf
     * @return
     * @throws ioexception
     * @throws classnotfoundexception
     */
    public static message decode(byte[] buf) throws ioexception, classnotfoundexception {
        bytearrayinputstream bais = new bytearrayinputstream(buf);
        objectinputstream ois = new objectinputstream(bais);
        return (message) ois.readobject();
    }

    /**
     * 将对象转为二进制数据
     *
     * @param message
     * @return
     */
    public static byte[] encode(message message) throws ioexception {
        bytearrayoutputstream baos = new bytearrayoutputstream();
        objectoutputstream oos = new objectoutputstream(baos);
        oos.writeobject(message);
        oos.flush();
        return baos.tobytearray();
    }
}

finalvalue

package moremorechat_nio;
/**
 * @author mazouri
 * @create 2021-05-05 21:00
 */
public final class finalvalue {
    /**
     * 系统消息
     */
    public static final int msg_system = 0;
    /**
     * 群发消息
     */
    public static final int msg_group = 1;
    /**
     * 私发消息
     */
    public static final int msg_private = 2;
    /**
     * 客户端请求在线人员
     */
    public static final int msg_online = 3;
    /**
     * 客户端将用户名称发送给服务端
     */
    public static final int msg_name = 4;
}

message

package moremorechat_nio;

import java.io.serializable;

/**
 * @author mazouri
 * @create 2021-05-05 21:00
 */
public class message implements serializable {
    public int type;
    public string message;

    public message() {
    }

    public message(string message) {
        this.message = message;
    }

    public message(int type, string message) {
        this.type = type;
        this.message = message;
    }

    @override
    public string tostring() {
        return "message{" +
                "type=" + type +
                ", message='" + message + '\'' +
                '}';
    }
}

nioserver

package moremorechat_nio;

import lombok.extern.slf4j.slf4j;

import java.io.*;
import java.net.inetsocketaddress;
import java.nio.bytebuffer;
import java.nio.channels.*;
import java.util.arraylist;
import java.util.iterator;
import java.util.set;
import java.util.concurrent.atomic.atomicboolean;
import java.util.stream.collectors;

import static moremorechat_nio.finalvalue.*;

/**
 * ctrl+f12 方法
 * ctrl+alt+左键
 * @author mazouri
 * @create 2021-05-09 19:24
 */
@slf4j
public class nioserver {
    private selector selector;
    private serversocketchannel ssc;

    public nioserver() {
        try {
            // 创建 selector, 管理多个 channel
            selector = selector.open();
            //打开serversocketchannel，用于监听客户端的连接，它是所有客户端连接的父通道
            ssc = serversocketchannel.open();
            ssc.bind(new inetsocketaddress(8888));
            //设置连接为非堵塞模式
            ssc.configureblocking(false);
            // 2. 建立 selector 和 channel 的联系（注册）
            // selectionkey 就是将来事件发生后，通过它可以知道事件和哪个channel的事件
            //将serversocketchannel注册到reactor线程的多路复用器selector上，监听accept事件
            ssc.register(selector, selectionkey.op_accept);
        } catch (ioexception e) {
            e.printstacktrace();
        }
    }

    public static void main(string[] args) {
        nioserver server = new nioserver();
        log.debug("server启动完成，等待用户连接...");
        try {
            server.listen();
        } catch (exception e) {
            log.debug("发生了一些问题");
        }
    }

    /**
     * 监听用户的连接
     *
     * @throws exception
     */
    private void listen() throws exception {
        while (true) {
            // select 方法, 没有事件发生，线程阻塞，有事件，线程才会恢复运行, 通过selector的select（）方法可以选择已经准备就绪的通道 （这些通道包含你感兴趣的的事件）
            //通过selector的select（）方法可以选择已经准备就绪的通道 （这些通道包含你感兴趣的的事件）
            // select 在事件未处理时，它不会阻塞, 事件发生后要么处理，要么取消，不能置之不理
            selector.select();
            // 处理事件, selectedkeys 内部包含了所有发生的事件
            iterator<selectionkey> iterator = selector.selectedkeys().iterator();
            while (iterator.hasnext()) {
                selectionkey key = iterator.next();
                // 处理key 时，要从 selectedkeys 集合中删除，否则下次处理就会有问题
                iterator.remove();
                // 区分事件类型
                if (key.isacceptable()) {
                    serversocketchannel channel = (serversocketchannel) key.channel();
                    socketchannel sc = channel.accept();
                    sc.configureblocking(false);
                    sc.register(selector, selectionkey.op_read);
                } else if (key.isreadable()) {
                    dealreadevent(key);
                }
            }
        }
    }

    /**
     * 处理读事件
     *
     * @param key
     */
    private void dealreadevent(selectionkey key) {
        socketchannel channel = null;
        try {
            channel = (socketchannel) key.channel();
            bytebuffer buffer = bytebuffer.allocate(1024);
            int read = channel.read(buffer);
            // 如果是正常断开，read 的方法的返回值是 -1
            if (read == -1) {
                //cancel 会取消注册在 selector 上的 channel，并从 keys 集合中删除 key 后续不会再监听事件
                key.cancel();
            } else {
                buffer.flip();
                message msg = utils.decode(buffer.array());
                log.debug(msg.tostring());
                dealmessage(msg, key, channel);
            }
        } catch (ioexception | classnotfoundexception e) {
            system.out.println((key.attachment() == null ? "匿名用户" : key.attachment()) + " 离线了..");
            dealmessage(new message(msg_system, key.attachment() + " 离线了.."), key, channel);
            //取消注册
            key.cancel();
            //关闭通道
            try {
                channel.close();
            } catch (ioexception ioexception) {
                ioexception.printstacktrace();
            }
        }
    }

    /**
     * 处理各种消息，并发送给客户端
     *
     * @param msg
     * @param key
     * @param channel
     */
    private void dealmessage(message msg, selectionkey key, socketchannel channel) {
        switch (msg.type) {
            case msg_name:
                key.attach(msg.message);
                log.debug("用户{}已上线", msg.message);
                getconnectedchannel(channel).foreach(selectionkey -> {
                    socketchannel sc = (socketchannel) selectionkey.channel();
                    sendmsgtoclient(new message("收到一条系统消息: " + msg.message + "已上线"), sc);
                });
                break;
            case msg_group:
                getconnectedchannel(channel).foreach(selectionkey -> {
                    socketchannel sc = (socketchannel) selectionkey.channel();
                    sendmsgtoclient(new message(key.attachment() + "给大家发送了一条消息: " + msg.message), sc);
                });
                break;
            case msg_private:
                string[] s = msg.message.split("_");
                atomicboolean flag = new atomicboolean(false);
                getconnectedchannel(channel).stream().filter(sk -> s[0].equals(sk.attachment())).foreach(selectionkey -> {
                    socketchannel sc = (socketchannel) selectionkey.channel();
                    sendmsgtoclient(new message(key.attachment() + "给你发送了一条消息: " + s[1]), sc);
                    flag.set(true);
                });
                if (!flag.get()){
                    sendmsgtoclient(new message(s[1]+"用户不存在,请重新输入！！！"), channel);
                }

                break;
            case msg_online:
                arraylist<string> onlinelist = new arraylist<>();
                onlinelist.add((string) key.attachment());
                getconnectedchannel(channel).foreach(selectionkey -> onlinelist.add((string) selectionkey.attachment()));
                sendmsgtoclient(new message(onlinelist.tostring()), channel);
                break;
            case msg_system:
                getconnectedchannel(channel).foreach(selectionkey -> {
                    socketchannel sc = (socketchannel) selectionkey.channel();
                    sendmsgtoclient(new message("收到一条系统消息: " + msg.message), sc);
                });
                break;
            default:
                break;
        }
    }

    /**
     * 发送消息给客户端
     *
     * @param msg
     * @param sc
     */
    private void sendmsgtoclient(message msg, socketchannel sc) {
        try {
            byte[] bytes = utils.encode(msg);
            sc.write(bytebuffer.wrap(bytes));
        } catch (ioexception e) {
            log.debug("sendmsgtoclient出现了一些问题");
        }
    }

    /**
     * 获取所有channel,除去调用者
     *
     * @param channel
     * @return
     */
    private set<selectionkey> getconnectedchannel(socketchannel channel) {
        return selector.keys().stream()
                .filter(item -> item.channel() instanceof socketchannel && item.channel().isopen() && item.channel() != channel)
                .collect(collectors.toset());
    }
}

nioclient

package moremorechat_nio;

import lombok.extern.slf4j.slf4j;

import java.io.*;
import java.net.inetsocketaddress;
import java.nio.bytebuffer;
import java.nio.channels.selectionkey;
import java.nio.channels.selector;
import java.nio.channels.socketchannel;
import java.util.iterator;
import java.util.scanner;

import static moremorechat_nio.finalvalue.*;

/**
 * @author mazouri
 * @create 2021-04-29 12:02
 */
@slf4j
public class nioclient {
    private selector selector;
    private socketchannel socketchannel;
    private string username;
    private static scanner input;

    public nioclient() throws ioexception {
        selector = selector.open();
        socketchannel = socketchannel.open(new inetsocketaddress("127.0.0.1", 8888));
        socketchannel.configureblocking(false);
        socketchannel.register(selector, selectionkey.op_read);
        log.debug("client启动完成......");
        log.debug("请输入你的名字完成注册");
        input = new scanner(system.in);
        username = input.next();
        log.debug("欢迎{}来到聊天系统", username);
    }

    public static void main(string[] args) throws ioexception {
        system.out.println("tips: \n1. 直接发送消息会发给当前的所有用户 \n2. @用户名:消息  会私发给你要发送的用户 \n3. 输入  查询在线用户  会显示当前的在线用户");
        nioclient client = new nioclient();

        //启动一个子线程接受服务器发送过来的消息
        new thread(() -> {
            try {
                client.acceptmessagefromserver();
            } catch (exception e) {
                e.printstacktrace();
            }
        }, "receiveclientthread").start();

        //调用sendmessagetoserver,发送消息到服务端
        client.sendmessagetoserver();
    }

    /**
     * 将消息发送到服务端
     *
     * @throws ioexception
     */
    private void sendmessagetoserver() throws ioexception {
        //先把用户名发给客户端
        message message = new message(msg_name, username);
        byte[] bytes = utils.encode(message);

        socketchannel.write(bytebuffer.wrap(bytes));
        while (input.hasnextline()) {
            string msgstr = input.next();

            message msg;
            boolean isprivate = msgstr.startswith("@");
            if (isprivate) {
                int idx = msgstr.indexof(":");
                string targetname = msgstr.substring(1, idx);
                msgstr = msgstr.substring(idx + 1);
                msg = new message(msg_private, targetname + "_" + msgstr);
            } else if ("查询在线用户".equals(msgstr)) {
                msg = new message(msg_online, "请求在线人数");
            } else {
                msg = new message(msg_group, msgstr);
            }

            byte[] bytes1 = utils.encode(msg);
            socketchannel.write(bytebuffer.wrap(bytes1));
        }
    }

    /**
     * 接受从服务器发送过来的消息
     */
    private void acceptmessagefromserver() throws exception {
        while (selector.select() > 0) {
            iterator<selectionkey> iterator = selector.selectedkeys().iterator();
            while (iterator.hasnext()) {
                selectionkey key = iterator.next();
                iterator.remove();
                if (key.isreadable()) {
                    socketchannel sc = (socketchannel) key.channel();
                    bytebuffer buffer = bytebuffer.allocate(1024);
                    sc.read(buffer);
                    message message = utils.decode(buffer.array());
                    log.debug(string.valueof(message.message));
                }
            }
        }
    }
}

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