Java实现NIO聊天室的示例代码(群聊+私聊)
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2022-03-17 14:35:09
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 org...
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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