1、pom.xml中添加依赖:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
</dependency>
2、添加web socket配置(要被spring扫描到):
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();
}
}
3、在java项目中添加WebSocketServer:
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;
@Slf4j
//@ServerEndpoint("/websocket/{user}")
@ServerEndpoint(value = "/websocket")
@Component
public class WebSocketServer {
//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;
/**
* 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("来自客户端的消息:" + 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();
}
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--;
}
}
4、html页面中添加相应js代码:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>WebSocket</title> <script type="text/javascript" src="lib/jquery/1.9.1/jquery.min.js"></script> <script src="static/js/sockjs.min.js"></script> <script src="static/js/stomp.min.js"></script> </head> <body> <h1>WebSocket 测试</h1> <br> <h2>去看控制台</h2> </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"); } socket = new WebSocket(getWsPath());//这里要注意路径问题,要与WebSocketServer相对应(项目名+路径) //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 调后台获取 }; //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(); });
function getWsPath(){ var host = window.location.host; //主机IP:port var path = window.document.location.pathname;//端口后的路径 var projectName = path.substring(0,path.substr(1).indexOf("/")+1);//项目名 return "ws://"+host+projectName+"/websocket"; }
</script> </html>
5、测试
@RequestMapping(value="/pushVideoListToWeb")
public void pushVideoListToWeb(String code) throws IOException {
try {
WebSocketServer.sendInfo("你瞅啥?!");
}catch (IOException e) {
log.info("websocket通信失败");
}
}