SpringBoot整合WebSocket的客户端和服务端的实现代码 SpringBoot整合WebSocket的客户端和

一、项目中服务端的创建
二、java充当客户端链接ws

1、ws客户端的配置
2、配置信息需要在项目启动的时候去启用和链接ws服务
3、接收服务端推送的消息进行权限过滤demo
4、ws客户端推送消息，推送消息和上面服务端类似。

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。
【SpringBoot整合WebSocket的客户端和服务端的实现代码】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

org.springframework.bootspring-boot-starter-websocket

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}")@Componentpublic 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 clients = new ConcurrentHashMap<>(); /** 创建一个map存放当前接入的客户端 */private static Map 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*/@OnOpenpublic 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*/@OnClosepublic 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*/@OnMessagepublic 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"); }@OnErrorpublic 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 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 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*/public static List getUserNosById(String id) {ArrayList userNos = new ArrayList<>(); for (Map.Entry 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@Slf4jpublic 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10Mcontainer.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); }@PostConstructpublic 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@Componentpublic class WSHandler {@AutowiredRedisTemplate redisTemplate; private static RedisTemplate redisTemplateService; @PostConstructpublic void init() {redisTemplateService=redisTemplate; }@OnOpenpublic void onOpen(Session session) {WSClient.session = session; }@OnMessagepublic 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 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]); }}}}@OnErrorpublic 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); }@OnClosepublic 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}")@Componentpublic class WebSocket {private Logger log = LoggerFactory.getLogger(WebSocket.class); private static int onlineCount = 0; private static Map clients = new ConcurrentHashMap<>(); private Session session; /** 当前连接服务端的客户端ip */private String ip; @AutowiredRedisTemplate redisTemplate; private static RedisTemplate redisTemplateService; @PostConstructpublic void init() {redisTemplateService = redisTemplate; }@OnOpenpublic 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); }@OnClosepublic 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*/@OnMessagepublic void onMessage(String message) throws IOException {log.info("客户端发送消onMessage方法成功"); }@OnErrorpublic 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 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
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