1.引入包
compile 'org.springframework.boot:spring-boot-starter-websocket'
2.新建类MyWebsocket
import org.springframework.stereotype.Component;
import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;
@ServerEndpoint(value = "/websocket")
@Component
public class MyWebsocket {
//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<MyWebsocket> webSocketSet = new CopyOnWriteArraySet<MyWebsocket>();
//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) {
System.out.println("连接成功");
this.session = session;
webSocketSet.add(this); //加入set中
addOnlineCount(); //在线数加1
System.out.println("有新连接加入!当前在线人数为" + getOnlineCount());
try {
sendMessage("success");
System.out.println("发送连接成功");
} catch (IOException e) {
System.out.println("IO异常");
}
}
/**
* 连接关闭调用的方法
*/
@OnClose
public void onClose() {
System.out.println("有一连接关闭");
webSocketSet.remove(this); //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
*/
@OnMessage
public void onMessage(String message, Session session) throws IOException {
System.out.println("来自客户端的消息:" + message);
//群发消息
//sendInfo("ghghhhjkh");
}
/**
* 群发自定义消息
* */
public static void sendInfo(String message) throws IOException {
for (MyWebsocket item : webSocketSet) {
try {
item.sendMessage(message);
} catch (IOException e) {
continue;
}
}
}
/**
* 发生错误时调用
*/
@OnError
public void onError(Session session, Throwable error) {
System.out.println("发生错误");
error.printStackTrace();
}
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() {
MyWebsocket.onlineCount++;
}
public static synchronized void subOnlineCount() {
MyWebsocket.onlineCount--;
}
}
3.调用接口MyWebsocket.sendInfo("notice");
4.vue代码
methods:{
websocket () {
let ws = new WebSocket('ws://192.168.1.205:9032/websocket');
ws.onopen = () => {
// Web Socket 已连接上,使用 send() 方法发送数据
//console.log('数据发送中...')
//ws.send('Holle')
//console.log('数据发送完成')
}
ws.onmessage = evt => {
console.log('数据已接收...')
var received_msg = evt.data;
console.log(received_msg);
if("notice" == received_msg)
{
this.initData();
this.play();
}
else{
console.log("不刷新");
}
}
/* ws.onclose = function () {
// 关闭 websocket
console.log('连接已关闭...')
}
// 路由跳转时结束websocket链接
this.$router.afterEach(function () {
ws.close()
})*/
},
}