SpringBoot整合WebSocket的客户端和服务端的实现
本文是项目中使用了websocket进行一些数据的推送,对比项目做了一个demo,ws的相关问题不做细数,仅做一下记录。
此demo针对ws的搭建主要逻辑背景是一个服务端B:通讯层 产生消息推送出去,另外一个项目A充当客户端和服务端,A的客户端:是接收通讯层去无差别接收这些消息,A的服务端:根据地址ip去订阅。用户通过订阅A的ws,同时记录下自己的信息,项目B推送的消息,项目A接收到之后通过当初订阅的逻辑和一些权限过滤条件对项目B产生的消息进行过滤再推送到用户客户端上。
一、项目中服务端的创建
首先引入maven仓库
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-websocket</artifactId> </dependency>
websocket的服务端搭建
同时注意springboot要开启ws服务
启动类加上@EnableScheduling
简要解读demo
/webSocket/{id}:链接的id是业务上的一个id,这边之前做过类似拍卖的,相当于一个服务端或者业务上的一个标识,是客户端指明链接到哪一个拍卖间的标识
@ServerEndpoint:作为服务端的注解。
package com.ghh.myproject.websocket; import cn.hutool.core.lang.UUID; import com.alibaba.fastjson.JSON; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.stereotype.Component; import javax.websocket.*; import javax.websocket.server.PathParam; import javax.websocket.server.ServerEndpoint; import java.io.IOException; import java.util.ArrayList; import java.util.List; import java.util.Map; import java.util.concurrent.ConcurrentHashMap; @ServerEndpoint("/webSocket/{id}") @Component public class WebSocket { private Logger log = LoggerFactory.getLogger(WebSocket.class); private static int onlineCount = 0; /** 创建一个map存放 产生的ws链接推送 */ private static Map<String, WebSocket> clients = new ConcurrentHashMap<>(); /** 创建一个map存放 当前接入的客户端 */ private static Map<String, String> idMap = new ConcurrentHashMap<>(); private Session session; /** 链接进入的一个场景id */ private String id; /** 每一个链接的一个唯一标识 */ private String userNo; /** * @Description: 第三方文接入当前项目websocket后的记录信息 * @DateTime: 2021/7/5 10:02 * @Author: GHH * @Params: [id, session] * @Return void */ @OnOpen public void onOpen(@PathParam("id") String id, Session session) throws IOException { log.info("已连接到id:{}竞拍场,当前竞拍场人数:{}", id, getUserNosById(id).size()); this.id = id; this.session = session; // 生成一个随机序列号来存储一个id下的所有用户 this.userNo = UUID.fastUUID().toString(); addOnlineCount(); //根据随机序列号存储一个socket连接 clients.put(userNo, this); idMap.put(userNo, id); } /** * @Description: 关闭连接 * @DateTime: 2021/7/5 10:02 * @Author: GHH * @Params: [] * @Return void */ @OnClose public void onClose() throws IOException { clients.remove(userNo); idMap.remove(userNo); subOnlineCount(); } /** * @Description: 客户端发送消息调用此方法 * @DateTime: 2021/6/16 15:35 * @Author: GHH * @Params: [message] * @Return void */ @OnMessage public void onMessage(String message) throws IOException { // JSONObject jsonTo = JSONObject.parseObject(message); // String mes = (String) jsonTo.get("message"); // if (!("All").equals(jsonTo.get("To"))) { // sendMessageTo(mes, jsonTo.get("To").toString()); // } else { // sendMessageAll(message); // } log.info("onMessage方法成功"); } @OnError public void onError(Session session, Throwable error) { log.error("{}", error); } public static void sendMessageTo(String message, String userNo) throws IOException { // session.getBasicRemote().sendText(message); //session.getAsyncRemote().sendText(message); WebSocket webSocket = clients.get(userNo); if (webSocket != null && webSocket.session.isOpen()) { webSocket.session.getAsyncRemote().sendText(JSON.toJSONString(message)); } } /** * @Description: 推送到指定的id值的记录 * @DateTime: 2021/6/15 17:11 * @Author: GHH * @Params: [message, id] * @Return void */ public static void sendMessageToById(String message, String id) { // session.getBasicRemote().sendText(message); //session.getAsyncRemote().sendText(message); //根据id获取所有的userNo链接的用户 List<String> userNos = getUserNosById(id); for (WebSocket item : clients.values()) { //遍历链接的value值,如果当前传入的id中链接的用户包含value值,则推送。 if (userNos.contains(item.userNo)) { item.session.getAsyncRemote().sendText(message); } } } /** * @Description: 推送所有开启的信息 * @DateTime: 2021/6/15 17:13 * @Author: GHH * @Params: [message] * @Return void */ public static void sendMessageAll(String message){ for (WebSocket item : clients.values()) { item.session.getAsyncRemote().sendText(message); } } public static synchronized int getOnlineCount() { return onlineCount; } public static synchronized void addOnlineCount() { WebSocket.onlineCount++; } public static synchronized void subOnlineCount() { WebSocket.onlineCount--; } public static synchronized Map<String, WebSocket> getClients() { return clients; } /** * @Description: 根据相应场景的一些逻辑处理 * @DateTime: 2021/7/5 10:03 * @Author: GHH * @Params: [id] * @Return java.util.List<java.lang.String> */ public static List<String> getUserNosById(String id) { ArrayList<String> userNos = new ArrayList<>(); for (Map.Entry<String, String> entry : idMap.entrySet()) { if (entry.getValue().equals(id)) { userNos.add(entry.getKey()); } } return userNos; } }
demo中模拟的是定时器推送,第一个参数是消息内容,第二个是推送到哪一个拍卖间或者其他业务上的内容。方法的具体内容上一段代码有详细解释,有通过id,或者发送给全部ws链接的客户端
WebSocket.sendMessageToById(""+count,2+"");
@Scheduled(cron = "*/5 * * * * ?") public void job1(){ log.info("测试生成次数:{}",count); redisTemplate.opsForValue().set("测试"+count, ""+count++); if (count%2==0){ WebSocket.sendMessageToById(""+count,2+""); }else { WebSocket.sendMessageToById(""+count,1+""); } log.info("websocket发送"+count); }
二、java充当客户端链接ws。
上述是java作为ws服务端推送当前业务信息的一个demo。我们项目目前做的是一个通讯层的概念,只能够推送数据内容,却无法根据用户权限去推送不同的数据。
ws客户端的搭建,首先链接ws服务端。首先是我们另外一个服务的ws配置信息,我这边demo是模拟链接上面的ws服务
1、ws客户端的配置
package com.ghh.websocketRecive.wsMessage; import lombok.extern.slf4j.Slf4j; import org.springframework.stereotype.Component; import javax.websocket.ContainerProvider; import javax.websocket.Session; import javax.websocket.WebSocketContainer; import java.net.URI; /** * @author ghh * @date 2019-08-16 16:02 */ @Component @Slf4j public class WSClient { public static Session session; public static void startWS() { try { if (WSClient.session != null) { WSClient.session.close(); } WebSocketContainer container = ContainerProvider.getWebSocketContainer(); //设置消息大小最大为10M container.setDefaultMaxBinaryMessageBufferSize(10*1024*1024); container.setDefaultMaxTextMessageBufferSize(10*1024*1024); // 客户端,开启服务端websocket。 String uri = "ws://192.168.0.108:8082/webSocket/1"; Session session = container.connectToServer(WSHandler.class, URI.create(uri)); WSClient.session = session; } catch (Exception ex) { log.info(ex.getMessage()); } } }
2、配置信息需要在项目启动的时候去启用和链接ws服务
package com.ghh.websocketRecive; import com.ghh.websocketRecive.wsMessage.WSClient; import lombok.extern.slf4j.Slf4j; import org.mybatis.spring.annotation.MapperScan; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.scheduling.annotation.EnableScheduling; import javax.annotation.PostConstruct; @Slf4j @EnableScheduling @SpringBootApplication @MapperScan("com.ghh.websocketRecive.dao") public class WebsocketReciveApplication { public static void main(String[] args) { SpringApplication.run(WebsocketReciveApplication.class, args); } @PostConstruct public void init(){ log.info("初始化应用程序");
// 初始化ws,链接服务端 WSClient.startWS(); } }
3、接收服务端推送的消息进行权限过滤demo
@ClientEndpoint:作为ws的客户端注解,@OnMessage接收服务端推送的消息。
package com.ghh.websocketRecive.wsMessage; import com.alibaba.fastjson.JSON; import com.alibaba.fastjson.JSONObject; import com.ghh.websocketRecive.entity.Student; import com.ghh.websocketRecive.service.UserService; import lombok.extern.slf4j.Slf4j; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.data.redis.core.RedisTemplate; import org.springframework.stereotype.Component; import javax.annotation.PostConstruct; import javax.websocket.*; import java.util.Objects; import java.util.Set; import static com.ghh.websocketRecive.wsMessage.WSClient.startWS; @ClientEndpoint @Slf4j @Component public class WSHandler { @Autowired RedisTemplate<String,String> redisTemplate; private static RedisTemplate<String,String> redisTemplateService; @PostConstruct public void init() { redisTemplateService=redisTemplate; } @OnOpen public void onOpen(Session session) { WSClient.session = session; } @OnMessage public void processMessage(String message) { log.info("websocketRecive接收推送消息"+message); int permission = Integer.parseInt(message)%5; //查询所有订阅的客户端的ip。 Set<String> keys = redisTemplateService.keys("ip:*"); for (String key : keys) { // 根据登录后存储的客户端ip,获取权限地址 String s = redisTemplateService.opsForValue().get(key); String[] split = s.split(","); for (String s1 : split) { //向含有推送过来的数据权限地址的客户端推送告警数据。 if (s1.equals(permission+"")){ WebSocket.sendMessageToByIp(message,key.split(":")[1]); } } } } @OnError public void processError(Throwable t) { WSClient.session = null; try { Thread.sleep(5000); startWS(); } catch (InterruptedException e) { log.error("---websocket processError InterruptedException---", e); } log.error("---websocket processError error---", t); } @OnClose public void processClose(Session session, CloseReason closeReason) { log.error(session.getId() + closeReason.toString()); } public void send(String sessionId, String message) { try { log.info("send Msg:" + message); if (Objects.nonNull(WSClient.session)) { WSClient.session.getBasicRemote().sendText(message); } else { log.info("---websocket error----"); } } catch (Exception e) { log.error("---websocket send error---", e); } } }
4、ws客户端推送消息,推送消息和上面服务端类似。这边是根据ip
package com.ghh.websocketRecive.wsMessage; import cn.hutool.core.lang.UUID; import com.alibaba.fastjson.JSON; import com.ghh.websocketRecive.service.UserService; import lombok.Builder; import lombok.Data; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.data.redis.core.RedisTemplate; import org.springframework.stereotype.Component; import javax.annotation.PostConstruct; import javax.websocket.*; import javax.websocket.server.PathParam; import javax.websocket.server.ServerEndpoint; import java.io.IOException; import java.util.ArrayList; import java.util.List; import java.util.Map; import java.util.concurrent.ConcurrentHashMap; @ServerEndpoint("/webSocket/{ip}") @Component public class WebSocket { private Logger log = LoggerFactory.getLogger(WebSocket.class); private static int onlineCount = 0; private static Map<String, WebSocket> clients = new ConcurrentHashMap<>(); private Session session; /** 当前连接服务端的客户端ip */ private String ip; @Autowired RedisTemplate<String,String> redisTemplate; private static RedisTemplate<String,String> redisTemplateService; @PostConstruct public void init() { redisTemplateService = redisTemplate; } @OnOpen public void onOpen(@PathParam("ip") String ip, Session session) throws IOException { log.info("ip:{}客户端已连接:,当前客户端数量:{}", ip, onlineCount+1); this.ip = ip; this.session = session; // 接入一个websocket则生成一个随机序列号 addOnlineCount(); //根据随机序列号存储一个socket连接 clients.put(ip, this); } @OnClose public void onClose() throws IOException { clients.remove(ip); onlineCount--; subOnlineCount(); } /** * @Description: 客户端发送消息调用此方法 * @DateTime: 2021/6/16 15:35 * @Author: GHH * @Params: [message] * @Return void */ @OnMessage public void onMessage(String message) throws IOException { log.info("客户端发送消onMessage方法成功"); } @OnError public void onError(Session session, Throwable error) { log.error("{}", error); } public static void sendMessageTo(String message, String userNo) throws IOException { WebSocket webSocket = clients.get(userNo); if (webSocket != null && webSocket.session.isOpen()) { webSocket.session.getAsyncRemote().sendText(JSON.toJSONString(message)); } } /** * @Description: 推送到指定的ip值的记录 * @DateTime: 2021/6/15 17:11 * @Author: GHH * @Params: [message, id] * @Return void */ public static void sendMessageToByIp(String message, String ip) { for (WebSocket item : clients.values()) { //遍历链接的value值,如果当前传入的ip中链接的用户包含value值,则推送。 if (item.ip.equals(ip)) { item.session.getAsyncRemote().sendText(message); } } } /** * @Description: 推送所有开启的信息 * @DateTime: 2021/6/15 17:13 * @Author: GHH * @Params: [message] * @Return void */ public static void sendMessageAll(String message){ for (WebSocket item : clients.values()) { item.session.getAsyncRemote().sendText(message); } } public static synchronized int getOnlineCount() { return onlineCount; } public static synchronized void addOnlineCount() { WebSocket.onlineCount++; } public static synchronized void subOnlineCount() { WebSocket.onlineCount--; } public static synchronized Map<String, WebSocket> getClients() { return clients; } }
概述:
至此,简易的demo搭建完成,项目gitee网址:https://gitee.com/ghhNB/study.git
如有疑惑部分,欢迎大家积极探讨