场景
SpringBoot+Vue整合WebSocket实现前后端消息推送:
https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/114392573
SpringCloud(若依微服务版为例)集成WebSocket实现前后端的消息推送:
https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/114480731
若依前后端分离版手把手教你本地搭建环境并运行项目:
https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/108465662
在上面的基础上,使用websocket仍有不足,比如可能出现如下问题
Nginx代理websocket配置(解决websocket异常断开连接tcp连接不断问题):
https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/126082838另外如果业务场景中需要高频定时任务通过websocket给多个客户端发动消息,
则短时间内需要使用多线程/自定义线程池实现群发消息功能。
关于自定义线程池相关可参考如下
Java中创建线程的方式以及线程池创建的方式、推荐使用ThreadPoolExecutor以及示例:
https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/130068794
Java中线程的常用操作-后台线程、自定义线程工厂ThreadFactpry、join加入一个线程、线程异常捕获:
https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/130197910
注:
博客:
https://blog.csdn.net/badao_liumang_qizhi
实现
1、netty-websocket-spring-boot-starter与若依集成websocket
本项目帮助你在spring-boot中使用Netty来开发WebSocket服务器,并像spring-websocket的注解开发一样简单。
仓库地址:
https://api.gitee.com/Yeauty/netty-websocket-spring-boot-starter
https://github.com/YeautyYE/netty-websocket-spring-boot-starter/blob/master/README_zh.md
除了此开源项目之外,这里还基于若依开源项目框架中基于websocket的插件集成
2、项目中添加依赖
<dependency> <groupId>org.yeauty</groupId> <artifactId>netty-websocket-spring-boot-starter</artifactId> <version>0.12.0</version> </dependency>
然后集合以上两个开源框架的示例代码新建如下类
3、其中WebSocketServer类为端点类,实现代码
package com.badao.demo.websocket; import io.netty.handler.codec.http.HttpHeaders; import io.netty.handler.timeout.IdleStateEvent; import lombok.extern.slf4j.Slf4j; import org.yeauty.annotation.*; import org.yeauty.pojo.Session; import java.io.IOException; import java.util.concurrent.Semaphore; @ServerEndpoint(path = "/websocket/{userName}", port = "${ws.port}", readerIdleTimeSeconds = "${ws.readerIdleTimeSeconds}", writerIdleTimeSeconds = "${ws.writerIdleTimeSeconds}", allIdleTimeSeconds = "${ws.allIdleTimeSeconds}") @Slf4j public class WebSocketServer { /** * 默认最多允许同时在线人数 200 */ public static int socketMaxOnlineCount = 200; private static final Semaphore socketSemaphore = new Semaphore(socketMaxOnlineCount); @OnOpen public void onOpen(Session session, HttpHeaders headers, @PathVariable String userName) { boolean semaphoreFlag = false; // 尝试获取信号量 semaphoreFlag = SemaphoreUtils.tryAcquire(socketSemaphore); if (!semaphoreFlag) { // 未获取到信号量 log.error("\n 当前人数 - {} , 限制人数:{} ", WebSocketUsers.getUsers().size(), socketMaxOnlineCount); WebSocketUsers.sendMessageToUserByText(session, "当前人数:" + WebSocketUsers.getUsers().size() + " 限制人数:" + socketMaxOnlineCount); session.close(); } else { // 添加用户 WebSocketUsers.sendMessageToUserByText(session, "连接成功"); WebSocketUsers.put(userName, session); log.warn("\n 用户:{} 连接后 , 当前人数 : {}", userName, WebSocketUsers.getUsers().size()); } } @OnClose public void onClose(Session session, @PathVariable String userName) throws IOException { // 移除用户 WebSocketUsers.remove(userName); log.warn("\n 用户:{} 关闭后 , 当前人数 : {}", userName, WebSocketUsers.getUsers().size()); // 获取到信号量则需释放 SemaphoreUtils.release(socketSemaphore); } @OnError public void one rror(Session session, @PathVariable String userName, Throwable exception) { if (session.isOpen()) { // 关闭连接 session.close(); } log.warn("\n 连接异常 - {}", userName); log.warn("\n 异常信息 - {}", exception); // 移出用户 WebSocketUsers.remove(userName); // 获取到信号量则需释放 SemaphoreUtils.release(socketSemaphore); } @OnMessage public void onMessage(Session session, String message) { WebSocketUsers.sendMessageToUserByText(session, message); } @OnBinary public void onBinary(Session session, byte[] bytes) { for (byte b : bytes) { System.out.println(b); } session.sendBinary(bytes); } @OnEvent public void onEvent(@PathVariable String userName, Session session, Object evt) { if (evt instanceof IdleStateEvent) { IdleStateEvent idleStateEvent = (IdleStateEvent) evt; switch (idleStateEvent.state()) { case READER_IDLE: log.error("user-{} Read timeout!", userName); session.close(); break; case WRITER_IDLE: log.error("user-{} Write timeout!", userName); session.close(); break; case ALL_IDLE: log.error("user-{} All timeout!", userName); session.close(); break; default: break; } } } }
注意这里的注解@ServerEndpoint是org.yeauty路径下的,别引用错了包。
在端点类上加上@ServerEndpoint注解,并在相应的方法上加上
@BeforeHandshake、@OnOpen、@OnClose、@OnError、@OnMessage、@OnBinary、@OnEvent注解。
注解说明:
@ServerEndpoint
当ServerEndpointExporter类通过Spring配置进行声明并被使用,它将会去扫描带有@ServerEndpoint注解的类
被注解的类将被注册成为一个WebSocket端点 所有的配置项都在这个注解的属性中 ( 如:@ServerEndpoint("/ws") )
@BeforeHandshake
当有新的连接进入时,对该方法进行回调 注入参数的类型:Session、HttpHeaders...
@OnOpen
当有新的WebSocket连接完成时,对该方法进行回调 注入参数的类型:Session、HttpHeaders...
@OnClose
当有WebSocket连接关闭时,对该方法进行回调 注入参数的类型:Session
@OnError
当有WebSocket抛出异常时,对该方法进行回调 注入参数的类型:Session、Throwable
@OnMessage
当接收到字符串消息时,对该方法进行回调 注入参数的类型:Session、String
@OnBinary
当接收到二进制消息时,对该方法进行回调 注入参数的类型:Session、byte[]
@OnEvent
当接收到Netty的事件时,对该方法进行回调 注入参数的类型:Session、Object
配置说明
所有的配置项都在这个注解的属性中。
属性 默认值 说明
path "/" WebSocket的path,也可以用value来设置
host "0.0.0.0" WebSocket的host,"0.0.0.0"即是所有本地地址
port 80 WebSocket绑定端口号。如果为0,则使用随机端口(端口获取可见 多端点服务)
bossLoopGroupThreads 0 bossEventLoopGroup的线程数
workerLoopGroupThreads 0 workerEventLoopGroup的线程数
useCompressionHandler false 是否添加WebSocketServerCompressionHandler到pipeline
optionConnectTimeoutMillis 30000 与Netty的ChannelOption.CONNECT_TIMEOUT_MILLIS一致
optionSoBacklog 128 与Netty的ChannelOption.SO_BACKLOG一致
childOptionWriteSpinCount 16 与Netty的ChannelOption.WRITE_SPIN_COUNT一致
childOptionWriteBufferHighWaterMark 64*1024 与Netty的ChannelOption.WRITE_BUFFER_HIGH_WATER_MARK一致,但实际上是使用ChannelOption.WRITE_BUFFER_WATER_MARK
childOptionWriteBufferLowWaterMark 32*1024 与Netty的ChannelOption.WRITE_BUFFER_LOW_WATER_MARK一致,但实际上是使用 ChannelOption.WRITE_BUFFER_WATER_MARK
childOptionSoRcvbuf -1(即未设置) 与Netty的ChannelOption.SO_RCVBUF一致
childOptionSoSndbuf -1(即未设置) 与Netty的ChannelOption.SO_SNDBUF一致
childOptionTcpNodelay true 与Netty的ChannelOption.TCP_NODELAY一致
childOptionSoKeepalive false 与Netty的ChannelOption.SO_KEEPALIVE一致
childOptionSoLinger -1 与Netty的ChannelOption.SO_LINGER一致
childOptionAllowHalfClosure false 与Netty的ChannelOption.ALLOW_HALF_CLOSURE一致
readerIdleTimeSeconds 0 与IdleStateHandler中的readerIdleTimeSeconds一致,并且当它不为0时,将在pipeline中添加IdleStateHandler
writerIdleTimeSeconds 0 与IdleStateHandler中的writerIdleTimeSeconds一致,并且当它不为0时,将在pipeline中添加IdleStateHandler
allIdleTimeSeconds 0 与IdleStateHandler中的allIdleTimeSeconds一致,并且当它不为0时,将在pipeline中添加IdleStateHandler
maxFramePayloadLength 65536 最大允许帧载荷长度
useEventExecutorGroup true 是否使用另一个线程池来执行耗时的同步业务逻辑
eventExecutorGroupThreads 16 eventExecutorGroup的线程数
sslKeyPassword ""(即未设置) 与spring-boot的server.ssl.key-password一致
sslKeyStore ""(即未设置) 与spring-boot的server.ssl.key-store一致
sslKeyStorePassword ""(即未设置) 与spring-boot的server.ssl.key-store-password一致
sslKeyStoreType ""(即未设置) 与spring-boot的server.ssl.key-store-type一致
sslTrustStore ""(即未设置) 与spring-boot的server.ssl.trust-store一致
sslTrustStorePassword ""(即未设置) 与spring-boot的server.ssl.trust-store-password一致
sslTrustStoreType ""(即未设置) 与spring-boot的server.ssl.trust-store-type一致
corsOrigins {}(即未设置) 与spring-boot的@CrossOrigin#origins一致
corsAllowCredentials ""(即未设置) 与spring-boot的@CrossOrigin#allowCredentials一致
且这里的配置可以在yml中进行配置。
需要在application.yml中添加如下配置项
ws: # websocket 端口 port: 8071 # websocket 读超时 readerIdleTimeSeconds: 10 # websocket 写超时 writerIdleTimeSeconds: 10 # websocket 所有信道超时 allIdleTimeSeconds: 15
4、注意上面的信号量相关处理封装的工具类
package com.badao.demo.websocket; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.util.concurrent.Semaphore; /** * 信号量相关处理 */ public class SemaphoreUtils { /** * SemaphoreUtils 日志控制器 */ private static final Logger LOGGER = LoggerFactory.getLogger(SemaphoreUtils.class); /** * 获取信号量 * * @param semaphore * @return */ public static boolean tryAcquire(Semaphore semaphore) { boolean flag = false; try { flag = semaphore.tryAcquire(1); } catch (Exception e) { LOGGER.error("获取信号量异常", e); } return flag; } /** * 释放信号量 * * @param semaphore */ public static void release(Semaphore semaphore) { try { semaphore.release(); } catch (Exception e) { LOGGER.error("释放信号量异常", e); } } }
5、存储用户信息的WebSocketUsers类实现
package com.badao.demo.websocket; import com.badao.demo.config.MyThreadFactory; import lombok.extern.slf4j.Slf4j; import org.yeauty.pojo.Session; import java.util.Collection; import java.util.Map; import java.util.Set; import java.util.concurrent.*; @Slf4j public class WebSocketUsers { private static final ThreadPoolExecutor pool = new ThreadPoolExecutor(10,WebSocketServer.socketMaxOnlineCount,10, TimeUnit.SECONDS,new ArrayBlockingQueue<>(1000),new MyThreadFactory("websocket-")); /** * 用户集 */ private static Map<String, Session> USERS = new ConcurrentHashMap<String, Session>(); /** * 存储用户 * * @param key 唯一键 * @param session 用户信息 */ public static void put(String key, Session session) { USERS.put(key, session); } /** * 移除用户 * * @param session 用户信息 * @return 移除结果 */ public static boolean remove(Session session) { String key = null; boolean flag = USERS.containsValue(session); if (flag) { Set<Map.Entry<String, Session>> entries = USERS.entrySet(); for (Map.Entry<String, Session> entry : entries) { Session value = entry.getValue(); if (value.equals(session)) { key = entry.getKey(); break; } } } else { return true; } return remove(key); } /** * 移出用户 * * @param key 键 */ public static boolean remove(String key) { Session remove = USERS.remove(key); if (remove != null) { boolean containsValue = USERS.containsValue(remove); log.warn("\n 移出结果 - {}", containsValue ? "失败" : "成功"); return containsValue; } else { return true; } } /** * 获取在线用户列表 * * @return 返回用户集合 */ public static Map<String, Session> getUsers() { return USERS; } /** * 群发消息文本消息 * * @param message 消息内容 */ public static void sendMessageToUsersByText(String message) { Collection<Session> values = USERS.values(); for (Session value : values) { pool.submit(() -> { synchronized (value) { value.sendText(message); } }); } } /** * 发送文本消息 * * @param session 自己的用户名 * @param message 消息内容 */ public static void sendMessageToUserByText(Session session, String message) { if (session != null) { session.sendText(message); } else { log.info("\n[你已离线]"); } } }
这里用的线程池相关概念参考上面博客,附自定义线程工厂MyThreadFactory实现
package com.badao.demo.config; import java.util.concurrent.ThreadFactory; import java.util.concurrent.atomic.AtomicInteger; public class MyThreadFactory implements ThreadFactory { private static final AtomicInteger poolNumber = new AtomicInteger(1); private final ThreadGroup group; private final AtomicInteger threadNumber = new AtomicInteger(1); private final String namePrefix; public MyThreadFactory(String threadName) { SecurityManager s = System.getSecurityManager(); group = (s !=null)?s.getThreadGroup():Thread.currentThread().getThreadGroup(); if(threadName == null || threadName.isEmpty()){ threadName = "pool"; } namePrefix = threadName + poolNumber.getAndIncrement()+"-thread-"; } @Override public Thread newThread(Runnable r) { Thread t = new Thread(group,r,namePrefix+threadNumber.getAndIncrement(),0); if(t.isDaemon()){ t.setDaemon(false); } if(t.getPriority()!= Thread.NORM_PRIORITY){ t.setPriority(Thread.NORM_PRIORITY); } return t; } }
这里定义了线程名前缀。
6、又新建了一个Controller目的是为了获取当前所有的用户,因为前面限制了只能允许最多200用户
package com.badao.demo.websocket; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; @RestController @RequestMapping("/websocket") public class WebsocketController { @GetMapping("/total") public String websocketTotal(){ return WebSocketUsers.getUsers().keySet().toString(); } }
7、启动项目并使用websocket客户端工具进行测试
标签:Netty,websocket,Session,spring,session,import,多线程,public,群发 From: https://www.cnblogs.com/badaoliumangqizhi/p/17547483.html