1.在pom.xml中加入相应的jar依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
2.resources/application.properties的配置文件
spring.mvc.view.prefix=/page/
spring.mvc.view.suffix=.html
server.port=8083
#checkcentersys
server.servlet.context-path: /checkcentersys
3.WebSocket服务端
package com.example.websocket;
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.concurrent.CopyOnWriteArraySet;
@ServerEndpoint("/websocket/{sid}")
@Component
public class WebSocketServer {
public static final 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 = 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<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>();
//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--;
}
}
3.websocket客户端测试页面,路径resources/static/page/socket.html
<!DOCTYPE html>
<html>
<!--整体布局-->
<head>
<meta charset="utf-8">
<title>测试页面</title>
<meta name="renderer" content="webkit">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta http-equiv="Access-Control-Allow-Origin" content="*">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="format-detection" content="telephone=no">
<body class="main_body">
<script>
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("ws://localhost:8083/checkcentersys/websocket/20");
//socket = new WebSocket("${basePath}websocket/${cid}".replace("http","ws"));
//打开事件
socket.onopen = function() {
console.log("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);
//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");
};
//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>
4.websocket controller层测试程序
package com.example.websocket;
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;
@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.测试
页面访问(页面往服务端推送数据)
http://localhost:8083/checkcentersys/checkcenter/socket/22
服务端推送数据
http://localhost:8083/checkcentersys/checkcenter/socket/push/2299999