WebSocket消息推送（群发和指定到个人）
1.客户端： HTML
<!DOCTYPE html> <html> <head> <title>Java后端WebSocket的Tomcat实现</title> </head> <body> Welcome<br/><input id="text" type="text"/> <button onclick="send()">发送消息</button> <hr/> <!--userno:发送消息人的编号--> <div id="userno">1234</div> <button onclick="closeWebSocket()">关闭WebSocket连接</button> <hr/> <div id="message"></div> </body> <script type="text/javascript"> var websocket = null; var userno=document.getElementById('userno').innerHTML; //判断当前浏览器是否支持WebSocket if ('WebSocket' in window) { websocket = new WebSocket("ws://localhost:8899/websocket/"+userno); } else { alert('当前浏览器 Not support websocket') } //连接发生错误的回调方法 websocket.onerror = function () { setMessageInnerHTML("WebSocket连接发生错误"); }; //连接成功建立的回调方法 websocket.onopen = function () { setMessageInnerHTML("WebSocket连接成功"); } //接收到消息的回调方法 websocket.onmessage = function (event) { setMessageInnerHTML(event.data); } //连接关闭的回调方法 websocket.onclose = function () { setMessageInnerHTML("WebSocket连接关闭"); } //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。 window.onbeforeunload = function () { closeWebSocket(); } //将消息显示在网页上 function setMessageInnerHTML(sendMessage) { document.getElementById('message').innerHTML += sendMessage + '<br/>'; } //关闭WebSocket连接 function closeWebSocket() { websocket.close(); } //发送消息 function send() { var message = document.getElementById('text').value;//要发送的消息内容 var now=getNowFormatDate();//获取当前时间 document.getElementById('message').innerHTML += (now+"发送人："+userno+'<br/>'+"---"+message) + '<br/>'; document.getElementById('message').style.color="red"; var ToSendUserno="4567";//接收人编号：4567 message=message+"|"+ToSendUserno//将要发送的信息和内容拼起来，以便于服务端知道消息要发给谁 websocket.send(message); } //获取当前时间 function getNowFormatDate() { var date = new Date(); var seperator1 = "-"; var seperator2 = ":"; var month = date.getMonth() + 1; var strDate = date.getDate(); if (month >= 1 && month <= 9) { month = "0" + month; } if (strDate >= 0 && strDate <= 9) { strDate = "0" + strDate; } var currentdate = date.getFullYear() + seperator1 + month + seperator1 + strDate + " " + date.getHours() + seperator2 + date.getMinutes() + seperator2 + date.getSeconds(); return currentdate; } </script> </html>
2.服务端：
pom.xml
<?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>com.example.websocket</groupId> <artifactId>websocketdemo</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>websocketdemo</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.8.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </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-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-messaging</artifactId> </dependency> <!--添加websocket依赖--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-websocket</artifactId> <version>1.3.5.RELEASE</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
java实体类：
WebSocketTest
package com.example.websocket.websocketdemo; import org.springframework.stereotype.Component; import javax.websocket.*; import javax.websocket.server.PathParam; import javax.websocket.server.ServerEndpoint; import java.io.IOException; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Date; import java.util.concurrent.ConcurrentHashMap; /** * @ServerEndpoint 注解是一个类层次的注解，它的功能主要是将目前的类定义成一个websocket服务器端, * 注解的值将被用于监听用户连接的终端访问URL地址,客户端可以通过这个URL来连接到WebSocket服务器端 * @ServerEndpoint 可以把当前类变成websocket服务类 */ @ServerEndpoint("/websocket/{userno}") @Component public class WebSocketTest { //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。若要实现服务端与单一客户端通信的话，可以使用Map来存放，其中Key可以为用户标识 private static ConcurrentHashMap<String, WebSocketTest> webSocketSet = new ConcurrentHashMap<String, WebSocketTest>(); //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; //当前发消息的人员编号 private String userno = ""; /** * 连接建立成功调用的方法 * * @param session 可选的参数。session为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 */ @OnOpen public void onOpen(@PathParam(value = "userno") String param, Session session, EndpointConfig config) { System.out.println(param); userno = param;//接收到发送消息的人员编号 this.session = session; webSocketSet.put(param, this);//加入map中 addOnlineCount(); //在线数加1 System.out.println("有新连接加入！当前在线人数为" + getOnlineCount()); } /** * 连接关闭调用的方法 */ @OnClose public void onClose() { if (!userno.equals("")) { webSocketSet.remove(userno); //从set中删除 subOnlineCount(); //在线数减1 System.out.println("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 * @param session 可选的参数 */ @OnMessage public void onMessage(String message, Session session) { System.out.println("来自客户端的消息:" + message); // session.get //群发消息 if (1 < 2) { sendAll(message); } else { //给指定的人发消息 sendToUser(message); } } /** * 给指定的人发送消息 * @param message */ private void sendToUser(String message) { String sendUserno = message.split("[|]")[1]; String sendMessage = message.split("[|]")[0]; String now = getNowTime(); try { if (webSocketSet.get(sendUserno) != null) { webSocketSet.get(sendUserno).sendMessage(now + "用户" + userno + "发来消息：" + " <br/> " + sendMessage); } else { System.out.println("当前用户不在线"); } } catch (IOException e) { e.printStackTrace(); } } /** * 给所有人发消息 * @param message */ private void sendAll(String message) { String now = getNowTime(); String sendMessage = message.split("[|]")[0]; //遍历HashMap for (String key : webSocketSet.keySet()) { try { //判断接收用户是否是当前发消息的用户 if (!userno.equals(key)) { webSocketSet.get(key).sendMessage(now + "用户" + userno + "发来消息：" + " <br/> " + sendMessage); System.out.println("key = " + key); } } catch (IOException e) { e.printStackTrace(); } } } /** * 获取当前时间 * * @return */ private String getNowTime() { Date date = new Date(); DateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String time = format.format(date); return time; } /** * 发生错误时调用 * * @param session * @param error */ @OnError public void onError(Session session, Throwable error) { System.out.println("发生错误"); error.printStackTrace(); } /** * 这个方法与上面几个方法不一样。没有用注解，是根据自己需要添加的方法。 * * @param message * @throws IOException */ public void sendMessage(String message) throws IOException { this.session.getBasicRemote().sendText(message); //this.session.getAsyncRemote().sendText(message); } public static synchronized int getOnlineCount() { return onlineCount; } public static synchronized void addOnlineCount() { WebSocketTest.onlineCount++; } public static synchronized void subOnlineCount() { WebSocketTest.onlineCount--; } }
WebSocketConfig
package com.example.websocket.websocketdemo; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.socket.server.standard.ServerEndpointExporter; @Configuration public class WebSocketConfig { @Bean public ServerEndpointExporter serverEndpointExporter() { return new ServerEndpointExporter(); } }
SpringBoot启动类：
package com.example.websocket.websocketdemo; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.boot.context.embedded.ConfigurableEmbeddedServletContainer; import org.springframework.boot.context.embedded.EmbeddedServletContainerCustomizer; import org.springframework.boot.web.support.SpringBootServletInitializer; @SpringBootApplication public class WebsocketdemoApplication extends SpringBootServletInitializer implements EmbeddedServletContainerCustomizer { public static void main(String[] args) { SpringApplication.run(WebsocketdemoApplication.class, args); } @Override public void customize(ConfigurableEmbeddedServletContainer container) { container.setPort(8899);//设置服务端口为8899 } }
源码下载地址：http://download.csdn.net/download/zb18829224773/10121298（导入直接可以跑）
