springboot整合WebSocket实现后台向前端的消息推送

1、pom.xml配置

xml version ="1.0" encoding ="UTF-8" ?> < project xmlns ="http://maven.apache.org/POM/4.0.0" xmlns: xsi ="http://www.w3.org/2001/XMLSchema-instance" xsi :schemaLocation ="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" > < modelVersion > 4.0.0 modelVersion > < groupId > cn.itfeiyue groupId > < artifactId > websocket artifactId > < version > 0.0.1-SNAPSHOT version > < packaging > jar packaging > < name > websocket name > < description > Demo project for Spring Boot description > < parent > < groupId > org.springframework.boot groupId > < artifactId > spring-boot-starter-parent artifactId > < version > 2.0.3.RELEASE version > < relativePath /> parent > < properties > < project.build.sourceEncoding > UTF-8 project.build.sourceEncoding > < project.reporting.outputEncoding > UTF-8 project.reporting.outputEncoding > < java.version > 1.8 java.version > properties > < dependencies > < dependency > < groupId > org.springframework.boot groupId > < artifactId > spring-boot-starter-web artifactId > dependency > < dependency > < groupId > org.springframework.boot groupId > < artifactId > spring-boot-starter-test artifactId > < scope > test scope > dependency > < dependency > < groupId > org.springframework.boot groupId > < artifactId > spring-boot-starter-websocket artifactId > dependency > < dependency > < groupId > org.jboss.logging groupId > < artifactId > jboss-logging artifactId > < version > 3.3.1.Final version > dependency > dependencies > < build > < plugins > < plugin > < groupId > org.springframework.boot groupId > < artifactId > spring-boot-maven-plugin artifactId > plugin > plugins > build > project >

2、WebSocket配置类

package cn.itfeiyue.websocket.config; import org.springframework.context.annotation. Bean ; import org.springframework.context.annotation. Configuration ; import org.springframework.web.socket.server.standard.ServerEndpointExporter; /** * 开启 WebSocket 支持 * * @author :ZHANGPENGFEI * @create 2018-07-11 13:52 **/ @Configuration public class WebSocketConfig { @Bean public ServerEndpointExporter serverEndpointExporter() { return new ServerEndpointExporter(); } }

3、WebSocket服务类

package cn.itfeiyue.websocket.util; import org.apache.juli.logging.Log; import org.apache.juli.logging.LogFactory; 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.concurrent.CopyOnWriteArraySet; /** * WebSocket 服务类 * * @author :ZHANGPENGFEI * @create 2018-07-11 13:54 **/ @ServerEndpoint ( "/websocket/{sid}" ) @Component public class WebSocketServer { static Log log =LogFactory. getLog (WebSocketServer. class ); // 静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。 private static int onlineCount = 0 ; //concurrent 包的线程安全 Set ，用来存放每个客户端对应的 MyWebSocket 对象。 private static CopyOnWriteArraySet webSocketSet = new CopyOnWriteArraySet(); // 与某个客户端的连接会话，需要通过它来给客户端发送数据 private Session session ; // 接收 sid private String sid = "" ; /** * 连接建立成功调用的方法 */ @OnOpen public void onOpen(Session session, @PathParam ( "sid" ) String sid) { this . session = session; webSocketSet .add( this ); // 加入 set 中 addOnlineCount (); // 在线数加 1 log .info( " 有新窗口开始监听 :" +sid+ ", 当前在线人数为 " + getOnlineCount ()); this . sid =sid; try { sendMessage( " 连接成功 " ); } catch (IOException e) { log .error( "websocket IO 异常 " ); } } /** * 连接关闭调用的方法 */ @OnClose public void onClose() { webSocketSet .remove( this ); // 从 set 中删除 subOnlineCount (); // 在线数减 1 log .info( " 有一连接关闭！当前在线人数为 " + getOnlineCount ()); } /** * 收到客户端消息后调用的方法 * * @param message 客户端发送过来的消息 */ @OnMessage public void onMessage(String message, Session session) { log .info( " 收到来自窗口 " + sid + " 的信息 :" +message); // 群发消息 for (WebSocketServer item : webSocketSet ) { try { item.sendMessage(message); } catch (IOException e) { e.printStackTrace(); } } } /** * * @param session * @param error */ @OnError public void onError(Session session, Throwable error) { log .error( " 发生错误 " ); error.printStackTrace(); } /** * 实现服务器主动推送 */ public void sendMessage(String message) throws IOException { this . session .getBasicRemote().sendText(message); } /** * 群发自定义消息 * */ public static void sendInfo(String message, @PathParam ( "sid" ) String sid) throws IOException { log .info( " 推送消息到窗口 " +sid+ " ，推送内容 :" +message); for (WebSocketServer item : webSocketSet ) { try { // 这里可以设定只推送给这个 sid 的，为 null 则全部推送 if (sid== null ) { item.sendMessage(message); } else if (item. sid .equals(sid)){ item.sendMessage(message); } } catch (IOException e) { continue ; } } } public static synchronized int getOnlineCount() { return onlineCount ; } public static synchronized void addOnlineCount() { WebSocketServer. onlineCount ++; } public static synchronized void subOnlineCount() { WebSocketServer. onlineCount --; } }

4、Controller类

package cn.itfeiyue.websocket.controller; import cn.itfeiyue.websocket.util.WebSocketServer; import org.springframework.stereotype. Controller ; import org.springframework.web.bind.annotation. GetMapping ; import org.springframework.web.bind.annotation. PathVariable ; import org.springframework.web.bind.annotation. RequestMapping ; import org.springframework.web.bind.annotation. ResponseBody ; import org.springframework.web.servlet.ModelAndView; import java.io.IOException; /** * 消息推送 * * @author :ZHANGPENGFEI * @create 2018-07-11 14:12 **/ @Controller @RequestMapping ( "/checkcenter" ) public class CheckCenterController { // 页面请求 @GetMapping ( "/socket/{cid}" ) public ModelAndView socket( @PathVariable String cid) { ModelAndView mav= new ModelAndView( "/socket" ); mav.addObject( "cid" , cid); return mav; } // 推送数据接口 @ResponseBody @RequestMapping ( "/socket/push/{cid}" ) public String pushToWeb( @PathVariable String cid,String message) { try { WebSocketServer. sendInfo (message,cid); } catch (IOException e) { e.printStackTrace(); return cid+ "#" +e.getMessage(); } return cid; } }

5、html页面

html > HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" > < html > < head > < base href= "<%=basePath%>" > < meta charset= "UTF-8" > < meta name= "viewport" content= "width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0" > < title > 弹窗 title > < script type= "text/javascript" src= "../js/jquery-3.2.1.min.js" > script > < script type= "text/javascript" src= "../js/FileSaver.js" > script > head > < body > < h2 >33 h2 > < input id= "start" > < input id= "message" > < iframe id= "my_iframe" style= " display : none ; " > iframe > < script type= "application/javascript" > var socket ; if ( typeof ( WebSocket ) == "undefined" ) { console . log ( " 您的浏览器不支持 WebSocket" ); } else { console . log ( " 您的浏览器支持 WebSocket" ); // 实现化 WebSocket 对象，指定要连接的服务器地址与端口 建立连接 // 等同于 socket = new WebSocket("ws://localhost:8083/checkcentersys/websocket/20"); //socket = new WebSocket("http://localhost:8080/websocket/${cid}".replace("http","ws")); socket = new WebSocket ( "ws://localhost:8080/websocket/33" ); // 打开事件 socket .onopen = function () { console . log ( "Socket 已打开 " ); $( "#start" ). val ( "Socket 已打开 " ) //socket.send(" 这是来自客户端的消息 " + location.href + new Date()); }; // 获得消息事件 socket .onmessage = function (msg) { console . log (msg.data); $( "#message" ). val (msg.data) // 发现消息进入 开始处理前端触发逻辑 }; // 关闭事件 socket .onclose = function () { console . log ( "Socket 已关闭 " ); $( "#close" ). val ( "Socket 已关闭 " ) }; // 发生了错误事件 socket .onerror = function () { alert ( "Socket 发生了错误 " ); // 此时可以尝试刷新页面 } // 离开页面时，关闭 socket //jquery1.8 中已经被废弃， 3.0 中已经移除 // $(window).unload(function(){ // socket.close(); //}); } script > body > html >

6、启动效果

启动WebSocket服务，启动对应的22、33客户端

启动后的页面效果为：

22：

33：

后台打印如下：

给33发送消息：

页面效果：

给22发送消息

页面效果：