WebSocket实时通讯的自学过程(持续更新)
2018-01-02 12:01
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webSocket的两种实现方式
继承Endpoint 基类实现WebSocket
服务端使用注解@ServerEndpoint
HandshakeInterceptor.java
WebsocketEndPoint.java
前端页面
后端代码
继承Endpoint 基类实现WebSocket
服务端使用注解@ServerEndpoint
1.Spring配置文件applicationContext的配置
<bean id="websocket" class="com.ym.crud.utils.WebsocketEndPoint"/> <websocket:handlers> <websocket:mapping path="/websocket" handler="websocket" /> <websocket:handshake-interceptors> <bean class="com.ym.crud.utils.HandshakeInterceptor" /> </websocket:handshake-interceptors> </websocket:handlers>
HandshakeInterceptor.java
package com.ym.crud.utils; import java.util.Map; import org.springframework.http.server.ServerHttpRequest; import org.springframework.http.server.ServerHttpResponse; import org.springframework.web.socket.WebSocketHandler; import org.springframework.web.socket.server.support.HttpSessionHandshakeInterceptor; public class HandshakeInterceptor extends HttpSessionHandshakeInterceptor{ @Override public boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Map<String, Object> attributes) throws Exception { System.out.println("Before Handshake"); return super.beforeHandshake(request, response, wsHandler, attributes); } @Override public void afterHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Exception ex) { System.out.println("After Handshake"); super.afterHandshake(request, response, wsHandler, ex); } }
WebsocketEndPoint.java
package com.ym.crud.utils; import org.springframework.web.socket.TextMessage; import org.springframework.web.socket.WebSocketSession; import org.springframework.web.socket.handler.TextWebSocketHandler; public class WebsocketEndPoint extends TextWebSocketHandler { @Override protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception { super.handleTextMessage(session, message); TextMessage returnMessage = new TextMessage(message.getPayload()+" received at server"); session.sendMessage(returnMessage); } }
前端页面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <title>WebSocket/SockJS Echo Sample (Adapted from Tomcat's echo sample)</title> <style type="text/css"> #connect-container { float: left; width: 400px } #connect-container div { padding: 5px; } #console-container { float: left; margin-left: 15px; width: 400px; } #console { border: 1px solid #CCCCCC; border-right-color: #999999; border-bottom-color: #999999; height: 170px; overflow-y: scroll; padding: 5px; width: 100%; } #console p { padding: 0; margin: 0; } </style> <script src="http://cdn.sockjs.org/sockjs-0.3.min.js"></script> <script type="text/javascript"> var ws = null; var url = null; var transports = []; function setConnected(connected) { document.getElementById('connect').disabled = connected; document.getElementById('disconnect').disabled = !connected; document.getElementById('echo').disabled = !connected; } function connect() { alert("url:"+url); if (!url) { alert('Select whether to use W3C WebSocket or SockJS'); return; } ws = (url.indexOf('sockjs') != -1) ? new SockJS(url, undefined, {protocols_whitelist: transports}) : new WebSocket(url); ws.onopen = function () { setConnected(true); log('Info: connection opened.'); }; ws.onmessage = function (event) { log('Received: ' + event.data); }; ws.onclose = function (event) { setConnected(false); log('Info: connection closed.'); log(event); }; } function disconnect() { if (ws != null) { ws.close(); ws = null; } setConnected(false); } function echo() { if (ws != null) { var message = document.getElementById('message').value; log('Client Sent: ' + message); ws.send(message); } else { alert('connection not established, please connect.'); } } function updateUrl(urlPath) { if (urlPath.indexOf('sockjs') != -1) { url = urlPath; document.getElementById('sockJsTransportSelect').style.visibility = 'visible'; } else { if (window.location.protocol == 'http:') { url = 'ws://' + window.location.host + urlPath; } else { url = 'wss://' + window.location.host + urlPath; } document.getElementById('sockJsTransportSelect').style.visibility = 'hidden'; } } function updateTransport(transport) { alert(transport); transports = (transport == 'all') ? [] : [transport]; } 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 > 25) { console.removeChild(console.firstChild); } console.scrollTop = console.scrollHeight; } </script> </head> <body> <noscript><h2 style="color: #ff0000">Seems your browser doesn't support Javascript! Websockets rely on Javascript being enabled. Please enable Javascript and reload this page!</h2></noscript> <div> <div id="connect-container"> <input id="radio1" type="radio" name="group1" onclick="updateUrl(''/项目名称/websocket');"> <label for="radio1">W3C WebSocket</label> <br> <input id="radio2" type="radio" name="group1" onclick="updateUrl('/项目名称/websocket');"> <label for="radio2">SockJS</label> <div id="sockJsTransportSelect" style="visibility:hidden;"> <span>SockJS transport:</span> <select onchange="updateTransport(this.value)"> <option value="all">all</option> <option value="websocket">websocket</option> <option value="xhr-polling">xhr-polling</option> <option value="jsonp-polling">jsonp-polling</option> <option value="xhr-streaming">xhr-streaming</option> <option value="iframe-eventsource">iframe-eventsource</option> <option value="iframe-htmlfile">iframe-htmlfile</option> </select> </div> <div> <button id="connect" onclick="connect();">Connect</button> <button id="disconnect" disabled="disabled" onclick="disconnect();">Disconnect</button> </div> <div> <textarea id="message" style="width: 350px">Here is a message!</textarea> </div> <div> <button id="echo" onclick="echo();" disabled="disabled">Echo message</button> </div> </div> <div id="console-container"> <div id="console"></div> </div> </div> </body> </html>
2.类似于Servlet、Controller的注解实现方法
前端页面:<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%-- <jsp:forward page="/admin/toLogin"></jsp:forward> --%> <!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width" /> <title>WebSocket 客户端</title> </head> <body> <div> <input type="button" id="btnConnection" value="连接" /> <input type="button" id="btnClose" value="关闭" /> <input type="button" id="btnSend" value="发送" /> </div> <script type="text/javascript" src="${APP_PATH}/ssmWebSocket/static/js/jquery-1.12.4.min.js"></script> <script type="text/javascript"> var socket; if(typeof(WebSocket) == "undefined") { alert("您的浏览器不支持WebSocket"); /* return; */ } $("#btnConnection").click(function() { //实现化WebSocket对象,指定要连接的服务器地址与端口 socket = new WebSocket("ws://localhost:端口号/项目名称/ws/张三2232"); //打开事件 socket.onopen = function() { alert("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) { alert(msg.data); }; //关闭事件 socket.onclose = function() { alert("Socket已关闭"); }; //发生了错误事件 socket.onerror = function() { alert("发生了错误"); } }); //发送消息 $("#btnSend").click(function() { socket.send("这是来自客户端的消息" + location.href + new Date()); }); //关闭 $("#btnClose").click(function() { socket.close(); }); </script> </body> </html>
后端代码
package com.ym.crud.controller; import javax.websocket.CloseReason; import javax.websocket.OnClose; import javax.websocket.OnError; import javax.websocket.OnMessage; import javax.websocket.OnOpen; import javax.websocket.Session; import javax.websocket.server.PathParam; import javax.websocket.server.ServerEndpoint; //ws://127.0.0.1:端口号/Demo1/ws/张三 @ServerEndpoint("/ws/{user}") public class WSServer { private String currentUser; //连接打开时执行 @OnOpen public void onOpen(@PathParam("user") String user, Session session) { currentUser = user; System.out.println("Connected ... " + session.getId()); } //收到消息时执行 @OnMessage public String onMessage(String message, Session session) { System.out.println(currentUser + ":" + message); return currentUser + ":" + message; } //连接关闭时执行 @OnClose public void onClose(Session session, CloseReason closeReason) { System.out.println(String.format("Session %s closed because of %s", session.getId(), closeReason)); } //连接错误时执行 @OnError public void onError(Throwable t) { t.printStackTrace(); } }
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