WebSocket 1.0 learning and easy to use

WebSocket JavaScript API (client)

<script> var URL = "Ws://localhost:8080/websocketchatroom/chatroomserver";    var websocket;    var userName;        function setconnected (connected) {document.getElementById (' Connect '). disabled=connected;        document.getElementById (' disconnect '). Disabled =!connected;    document.getElementById (' send '). Disabled =!connected;        } function Connect () {if (' WebSocket ' in window) {WebSocket = new WebSocket (URL);        }else if (' Mozwebsocket ' in window) {websocket = new Mozwebsocket (URL);            }else{alert ("Your browser does not support WebSocket, please replace the latest version of the browser");        Return            } Websocket.onopen = function (evnt) {userName = document.getElementById (' userId '). Value;                if (UserName = = "") {alert ("User name cannot be null");            Return                }else{setconnected (TRUE);            Websocket.send (userName + "Join chat room");        }        }; Websocket.onmessage = function (evnt) {OnMessage (evnt)};        Websocket.onerror = function (evnt) {onerror (evnt)};        Websocket.onclose = function (evnt) {disconnect (evnt);        }} function SendMessage () {var userName = document.getElementById (' userId '). Value;        var msg = document.getElementById (' message '). Value;    Websocket.send (username+ ":" +msg);        } function OnMessage (evnt) {if (typeof Evnt.data = = "string") {log (evnt.data);    }} function OnError (evnt) {log (' ERROR: ' + evnt.data);    }/*function OnClose (evnt) {setconnected (false);            }*/function Disconnect (evnt) {if (websocket! = null) {Websocket.close ($, userName + "exit chat room");            WebSocket = null;            Log ("You have exited the chat room");        Setconnected (FALSE);        }} function log (message) {var console = document.getElementById (' console ');      var p = document.createelement (' P ');  P.style.wordwrap = ' Break-word ';        P.appendchild (document.createTextNode (message));        Console.appendchild (P);        while (Console.childNodes.length >) {console.removechild (console.firstchild);    } console.scrolltop = Console.scrollheight; }</script>

• websocket.onopen #当打开一个新的连接时会调用这个方法
• websocket.onmessage #当server有数据返回时调用
• websocket.send () #向服务端发送信息, type includes {string| arraybuffer| arraybufferview| BLOB}
• websocket.close () #向服务器发送关闭的请求, parameter {number} [code] {string} [reason], with related code table, generally use this method to close code 1000, directly close the browser to 1006, Close_abnormal

Status Code	Name	Description
0-999		Reserved and not used.
1000	Close_normal	Normal closure; The connection successfully completed whatever purpose for which it was created.
1001	Close_going_away	The endpoint is going away, either because of a server failure or because the browser are navigating away from the page tha T opened the connection.
1002	Close_protocol_error	The endpoint is terminating the connection due to a protocol error.
1003	close_unsupported	The connection is being terminated because the endpoint received data of a type it cannot accept (for example, a text-only Endpoint received binary data).
1004		Reserved. A meaning might is defined in the future.
1005	Close_no_status	Reserved. Indicates that no status code is provided even though one was expected.
1006	Close_abnormal	Reserved. Used to indicate this a connection was closed abnormally (that's, with no close frame being sent) when a status code is E Xpected.
1007		The endpoint is terminating the connection because a message were received that contained inconsistent data (e.g., non- UTF-8 data within a text message).
1008		The endpoint is terminating the connection because it received a message that violates it ' s policy. This was a generic status code, used when codes 1003 and 1009 were not suitable.
1009	Close_too_large	The endpoint is terminating the connection because a data frame was received this is too large.
1010		The client is terminating the connection because it expected the server to negotiate one or more extension, but the server Didn ' t.
1011		The server is terminating the connection because it encountered a unexpected condition that prevented it from fulfilling The request.
1012-1014		Reserved for future use by the WebSocket standard.
1015		Reserved. Indicates that the connection is closed due to a failure to perform a TLS handshake (e.g., the server certificate can ' t b E verified).
1016-1999		Reserved for future use by the WebSocket standard.
2000-2999		Reserved for use by WebSocket extensions.
3000-3999		Available for use by libraries and frameworks. May is used by applications.
4000-4999		Available for use by applications.

WebSocket Java API (Server)

@ServerEndpoint ("/chatroomserver") public class Messageendpoint {    private static final arraylist<session> Sessions;    static {        sessions = new arraylist<session> ();    }    @OnOpen public    void OnOpen (Session session) {        Sessions.add (session);    }    @OnMessage public    void OnMessage (String message) {        sendMessage (message);    }    @OnClose public    void OnClose (Session Session,closereason Closereason) {        sessions.remove (session);        SendMessage (Closereason.getreasonphrase ());    }    private void SendMessage (String message) {for        (Session session:sessions) {            try {                Session.getbasicremote (). SendText (message);            } catch (IOException e) {                e.printstacktrace ();}}}}    

• @ServerEndpoint ("/chatroomserver"),Serverendpoint converts a Pojo class into WebSocket EndPoint, and the value behind it is the access address
• for annotations please see

Annotation	Role
@ServerEndpoint	Declare a Server Endpoint
@ClientEndpoint	Declare a Client Endpoint
@OnOpen	Declare This method handles open events
@OnMessage	Declare This method handles Websocket messages
@OnError	Declare This method handles error
@OnClose	Declare This method handles WebSocket close events

<dependency>          <groupId>javax.websocket</groupId>          <artifactId> javax.websocket-api</artifactid>          <version>1.0</version>          <scope>provided</ Scope>      </dependency>

I use tomcat,<scope>provided</scope> this sentence must be added, otherwise it will be reported that there are related duplicate classes in 404,tomcat