<dependency>
			<groupId>com.jfinal</groupId>
			<artifactId>jfinal</artifactId>
			<version>3.4</version>
		</dependency>
		
		
		<dependency>
			<groupId>javax.websocket</groupId>
			<artifactId>javax.websocket-api</artifactId>
			<version>1.1</version>
			<scope>provided</scope>
		</dependency>
		


	/**
	 * 配置全局处理器
	 */
	@Override
	public void configHandler(Handlers handler) {
		// log.info("configHandler 全局配置处理器，设置跳过哪些URL不处理");
		handler.add(new UrlSkipHandler(
				"/|/ca/.*|/se/.*|.*.htm|.*.html|.*.js|.*.css|.*.json|.*.png|.*.gif|.*.jpg|.*.jpeg|.*.bmp|.*.ico|.*.exe|.*.txt|.*.zip|.*.rar|.*.7z|.*.tff|.*.woff|.*.ttf|.*.map|.*.xml|.*.woff2",
				false));
		handler.add(new GlobalHandler());
		handler.add(new WebSocketHandler("^/websocket"));
	}

public class WebSocketHandler extends Handler{
private Pattern filterUrlRegxPattern;
    
    public WebSocketHandler(String filterUrlRegx) {
        if (StrKit.isBlank(filterUrlRegx))
            throw new IllegalArgumentException("The para filterUrlRegx can not be blank.");
        filterUrlRegxPattern = Pattern.compile(filterUrlRegx);
    }
    @Override
    public void handle(String target, HttpServletRequest request, HttpServletResponse response, boolean[] isHandled) {
        if (filterUrlRegxPattern.matcher(target).find())
            return ;
        else
            next.handle(target, request, response, isHandled);
        
    }
}

@ServerEndpoint("/websocket")
public class WebSocketController {
	private static CopyOnWriteArraySet<WebSocketController> webSocketSet = new CopyOnWriteArraySet<WebSocketController>();
	private  Session session;
    public WebSocketController() {
        System.out.println(" WebSocket init~~~");
    }

    @OnOpen
    public void onOpen(Session session) {
        System.out.println("onOpen");
        this.session = session;
        webSocketSet.add(this);
    }

    @OnClose
    public void onClose(Session session) {
        System.out.println("onClose");
        this.session = session;
        webSocketSet.remove(this);
    }
    
//  @OnError
//  public void onError(Session session) {
//      System.out.println("onError");
//  }

    @OnMessage
    public void onMessage(String requestJson, Session session)
            throws IOException {
        requestJson = "后台回复：" + requestJson; 
        System.out.println(requestJson);
        session.getBasicRemote().sendText(requestJson);
    }
}

前端页面

	 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"+ctx+"/websocket");
	        // websocket = new WebSocket("ws://localhost:8080/websocket");
	    }
	    else {
	        alert('当前浏览器 Not support websocket')
	    }
	
	    //连接发生错误的回调方法
	    websocket.onerror = function () {
	        setMessageInnerHTML("WebSocket连接发生错误");
	    };
	
	    //连接成功建立的回调方法
	    websocket.onopen = function () {
	        setMessageInnerHTML("WebSocket连接成功");
	    }
	
	    //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("WebSocket连接关闭");
	    }
	
	    //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 () {
	        closeWebSocket();
	    }
	
	    //将消息显示在网页上
	    function setMessageInnerHTML(innerHTML) {
	       // alert(innerHTML);
	    }
	
	    //关闭WebSocket连接
	    function closeWebSocket() {
	        websocket.close();
	    }
	
	    //发送消息
	    function send() {
	        var message = "发送销项";
	        websocket.send(message);
	    }

页面加载时后台报错：

 WebSocket init~~~
onOpen
onClose
七月 02, 2020 9:02:55 上午 org.apache.tomcat.websocket.pojo.PojoEndpointBase onError
严重: No error handling configured for [com.mnt.websocket.WebSocketController] and the following error occurred
java.io.IOException: java.util.concurrent.ExecutionException: java.net.SocketException: Software caused connection abort: socket write error
	at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.startMessageBlock(WsRemoteEndpointImplBase.java:286)
	at org.apache.tomcat.websocket.WsSession.sendCloseMessage(WsSession.java:572)
	at org.apache.tomcat.websocket.WsSession.doClose(WsSession.java:466)
	at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.onError(WsHttpUpgradeHandler.java:161)
	at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.access$300(WsHttpUpgradeHandler.java:47)
	at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler$WsReadListener.onError(WsHttpUpgradeHandler.java:225)
	at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler$WsReadListener.onDataAvailable(WsHttpUpgradeHandler.java:208)
	at org.apache.coyote.http11.upgrade.AbstractServletInputStream.onDataAvailable(AbstractServletInputStream.java:203)
	at org.apache.coyote.http11.upgrade.AbstractProcessor.upgradeDispatch(AbstractProcessor.java:93)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:635)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.util.concurrent.ExecutionException: java.net.SocketException: Software caused connection abort: socket write error
	at org.apache.tomcat.websocket.FutureToSendHandler.get(FutureToSendHandler.java:120)
	at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.startMessageBlock(WsRemoteEndpointImplBase.java:281)
	... 14 more
Caused by: java.net.SocketException: Software caused connection abort: socket write error
	at java.net.SocketOutputStream.socketWrite0(Native Method)
	at java.net.SocketOutputStream.socketWrite(Unknown Source)
	at java.net.SocketOutputStream.write(Unknown Source)
	at org.apache.coyote.http11.upgrade.BioServletOutputStream.doWrite(BioServletOutputStream.java:38)
	at org.apache.coyote.http11.upgrade.AbstractServletOutputStream.writeInternal(AbstractServletOutputStream.java:153)
	at org.apache.coyote.http11.upgrade.AbstractServletOutputStream.write(AbstractServletOutputStream.java:121)
	at org.apache.tomcat.websocket.server.WsRemoteEndpointImplServer.onWritePossible(WsRemoteEndpointImplServer.java:94)
	at org.apache.tomcat.websocket.server.WsRemoteEndpointImplServer.doWrite(WsRemoteEndpointImplServer.java:81)
	at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.writeMessagePart(WsRemoteEndpointImplBase.java:456)
	at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.startMessage(WsRemoteEndpointImplBase.java:344)
	at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.startMessageBlock(WsRemoteEndpointImplBase.java:276)
	... 14 more

七月 02, 2020 9:02:55 上午 org.apache.tomcat.websocket.pojo.PojoEndpointBase onError
严重: No error handling configured for [com.mnt.websocket.WebSocketController] and the following error occurred
java.io.EOFException
	at org.apache.tomcat.websocket.server.WsFrameServer.onDataAvailable(WsFrameServer.java:64)
	at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler$WsReadListener.onDataAvailable(WsHttpUpgradeHandler.java:204)
	at org.apache.coyote.http11.upgrade.AbstractServletInputStream.onDataAvailable(AbstractServletInputStream.java:203)
	at org.apache.coyote.http11.upgrade.AbstractProcessor.upgradeDispatch(AbstractProcessor.java:93)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:635)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Unknown Source)

跪求报错原因。。。。