websocket是h5后的技术，主要实现是一个长连接跟tomcat的comet技术差不多，但websocket是基于web协议的，有更广泛的支持。当然，在处理高并发的情况下，可以结合tomcat的asyncContext来实现长处理的异步返回等操作。
1.引入依赖类
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.16.</version>
</dependency> <!-- websocket dependency -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
这里主要是引入websocket的依赖类
2.springboot配置websocket的入口bean
在springboot的配置类下，引入以下的配置bean
@Bean
public ServerEndpointExporter serverEndpointExporter() {
return new ServerEndpointExporter();
}
3.实现websocket的后端处理逻辑
package com.ouyang.server; import lombok.extern.slf4j.Slf4j;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component; import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArraySet; /**
* Created by Administrator on 2018/3/25.
*/ //@Slf4j
@ServerEndpoint(value = "/websocket")
@Component
public class WebSocketServer { Logger log = LoggerFactory.getLogger(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 = ;
//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<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>();
// 备用的同步hashmap
//private static ConcurrentHashMap<Session,WebSocketServer> webSocketServerConcurrentHashMap = new ConcurrentHashMap(); //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; /**
* 连接建立成功调用的方法*/
@OnOpen
public void onOpen(Session session) {
this.session = session;
webSocketSet.add(this); //加入set中
addOnlineCount(); //在线数加1
log.info("有新连接加入！当前在线人数为" + getOnlineCount());
try {
sendMessage("连接成功");
} catch (IOException e) {
log.error("websocket IO异常");
}
}
// //连接打开时执行
// @OnOpen
// public void onOpen(@PathParam("user") String user, Session session) {
// currentUser = user;
// System.out.println("Connected ... " + session.getId());
// } /**
* 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) throws IOException {
log.info("来自客户端的消息:" + message); //群发消息
for (WebSocketServer item : webSocketSet) {
try {
item.sendMessage("response message:"+message);
} catch (IOException e) {
e.printStackTrace();
}
}
//单发的信息
sendMessage("currentWebsocket is ok!!! ");
} /**
*
* @param session
* @param error
*/
@OnError
public void onError(Session session, Throwable error) {
log.error("发生错误");
error.printStackTrace();
} /**
*
* @param message
* @throws IOException
*/
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) throws IOException {
//log.info(message);
for (WebSocketServer item : webSocketSet) {
try {
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--;
}
}
至此，我们关于后台的websocket的主要实现类都实现了，接下来我们可以弄一个，测试的接口，用于给所有的websocket推送信息，如下：
@RequestMapping(value="/publicSend",method= RequestMethod.GET)
@ResponseBody
public String pushVideoListToWeb2(String id) {
try {
WebSocketServer.sendInfo("有新客户呼入,sltAccountId:"+id);
for(int i= ;i<;i++){
WebSocketServer.sendInfo("有新客户呼入,testing:"+String.valueOf(i));
}
}catch (IOException e) { }
return "success!"; }
4.前端测试页面的实现
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.springframework.org/schema/jdbc">
<head>
<meta charset="UTF-8">
<title>Title</title>
<script src="/static/jquery.js"></script>
<script src="/static/stomp.min.js"></script>
<script src="/static/sockjs.min.js"></script>
<script>
//socket = new WebSocket("ws://localhost:8081/begenstom/websocket");
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
//socket = new WebSocket("ws://localhost:9094/starManager/websocket/张三");
socket = new WebSocket("ws://localhost:8081/websocket");
//打开事件
socket.onopen = function () {
console.log("Socket 已打开");
for (var i=;i<;i++)
{
socket.send("这是来自客户端的消息1:" + i);
}
//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);
//发现消息进入 调后台获取
document.write(msg.data);
};
//关闭事件
socket.onclose = function () {
console.log("Socket已关闭");
};
//发生了错误事件
socket.onerror = function () {
alert("Socket发生了错误");
}
$(window).unload(function () {
socket.close();
});
}
</script> </head>
<body> </body>
</html>
这里主要用到3个js，可以去github上去当一个。
测试结果：==================
参考地址：
* https://blog.csdn.net/zhangdehua678/article/details/78913839
* https://github.com/ayman-elgharabawy/Kafka-SpringBoot-WebSocket
* 整合框架 https://github.com/527515025/springBoot