1.添加Maven依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-websocket</artifactId>
<version>1.3.5.RELEASE</version>
</dependency>
2.webSocket配置
/**
* webSocket配置
* @author 陈梓平
* @date 2017/10/25.
*/
@Configuration
public class WebSocketConfig {
/**
* 注入ServerEndpointExporter,
* 这个bean会自动注册使用了@ServerEndpoint注解声明的Websocket endpoint
* @return
*/
@Bean
public ServerEndpointExporter serverEndpointExporter() {
return new ServerEndpointExporter();
}
}
3.自定义websocket
/**
* 自定义websocket
* @author 陈梓平
* @date 2017/10/25.
*/
@ServerEndpoint(value = "/websocket")
@Component
public class CustomWebSocket {
/**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CumWebSocket对象。*/
private static CopyOnWriteArraySet<CustomWebSocket> webSocketSet = new CopyOnWriteArraySet<CustomWebSocket>();
/**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;
private static final Logger log = LoggerFactory.getLogger(CustomWebSocket.class);
/**
* 连接建立成功调用的方法
* @param session
*/
@OnOpen
public void onOpen(Session session) {
this.session = session;
//加入set中
webSocketSet.add(this);
//添加在线人数
addOnlineCount();
log.info("新连接接入。当前在线人数为:"+getOnlineCount());
try {
sendMessage("假装有内容");
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 连接关闭调用的方法
*/
@OnClose
public void onClose() {
//从set中删除
webSocketSet.remove(this);
//在线数减1
subOnlineCount();
log.info("有连接关闭。当前在线人数为:"+getOnlineCount());
}
/**
* 收到客户端消息后调用
* @param message
* @param session
*/
@OnMessage
public void onMessage(String message, Session session) {
log.info("客户端发送的消息:"+message);
sendAll(message);
}
/**
* 暴露给外部的群发
* @param message
* @throws IOException
*/
public static void sendInfo(String message) throws IOException {
sendAll(message);
}
/**
* 群发
* @param message
*/
private static void sendAll(String message) {
Arrays.asList(webSocketSet.toArray()).forEach(item -> {
CustomWebSocket customWebSocket = (CustomWebSocket) item;
//群发
try {
customWebSocket.sendMessage(message);
} catch (IOException e) {
e.printStackTrace();
}
});
}
/**
* 发生错误时调用
* @param session
* @param error
*/
@OnError
public void onError(Session session, Throwable error) {
log.info("有异常啦");
error.printStackTrace();
}
/**
* 减少在线人数
*/
private void subOnlineCount() {
CustomWebSocket.onlineCount--;
}
/**
* 添加在线人数
*/
private void addOnlineCount() {
CustomWebSocket.onlineCount++;
}
/**
* 当前在线人数
* @return
*/
public static synchronized int getOnlineCount() {
return onlineCount;
}
/**
* 发送信息
* @param message
* @throws IOException
*/
public void sendMessage(String message) throws IOException {
//获取session远程基本连接发送文本消息
this.session.getBasicRemote().sendText(message);
//this.session.getAsyncRemote().sendText(message);
}
}
4.前端页面
<!DOCTYPE HTML>
<html>
<head>
<title>WebSocket</title>
</head>
<body>
Welcome<br/>
<input id="text" type="text" /><button onclick="send()">Send</button> <button onclick="closeWebSocket()">Close</button>
<div id="message">
</div>
</body>
<script type="text/javascript">
var websocket = null;
//判断当前浏览器是否支持WebSocket
if('WebSocket' in window){
websocket = new WebSocket("ws://localhost:8080/websocket");
}
else{
alert('Not support websocket')
}
//连接发生错误的回调方法
websocket.onerror = function(){
setMessageInnerHTML("error");
};
//连接成功建立的回调方法
websocket.onopen = function(event){
setMessageInnerHTML("open");
}
//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("close");
}
//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(){
websocket.close();
}
//将消息显示在网页上
function setMessageInnerHTML(innerHTML){
document.getElementById('message').innerHTML += innerHTML + '<br/>';
}
//关闭连接
function closeWebSocket(){
websocket.close();
}
//发送消息
function send(){
var message = document.getElementById('text').value;
websocket.send(message);
}
</script>
</html>
5.测试