jee websocket搭建总结
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jee websocket搭建总结
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1、使用框架spring+springmvc+mybatis+jdk7+tomcat7+maven
2、基本原理：
a. WebSocket協議是一種雙向通信協議，它建立在TCP之上，同http一樣通過TCP來傳輸數據，但是 它和http最大的不同有兩點：
?????????????????? 1.WebSocket是一種雙向通信協議，在建立連接后，WebSocket服務器和Browser/UA都能主動地向對方發送或接收數據，就像Socket一樣，不同的是WebSocket是一種建立在Web基礎上的一種簡單模擬Socket的協議；
?????????????????? 2.WebSocket需要通過握手連接，類似于TCP它也需要客戶端和服務器端進行握手連接，連接成功后才能相互通信。
b.struts ? 和 websocket ?是2條處理請求的路，被struts 匹配上了 ，自然就到不了 websocket的處? 理邏輯,(http和ws是兩種不同的請求協議，注意框架的攔截器（過濾器）)
3、客戶端：
<html> <head><title>Title</title><style>div {margin-left: auto;margin-right: auto;}</style> </head> <body onLoad="startWebSocket()"> <script type="text/javascript">function clog(title) {console.log(title);}var ws = null;function startWebSocket() {if ('WebSocket' in window) {try {ws = new WebSocket("ws://127.0.0.1:80/websocket/tui");} catch (e) {clog("1");}} else if ('MozWebSocket' in window) {ws = new MozWebSocket("ws://127.0.0.1:80/websocket/tui");} else {clog("websocket not support");}ws.onmessage = function (evt) {say(evt.data);};ws.onclose = function (evt) {clog("close!");};ws.onopen = function (evt) {clog("open");};}function sendMsg() {ws.send(document.getElementById('writeMsg').value);}function say(msg) {var div = document.createElement("div");div.innerHTML = msg;document.body.appendChild(div);}</script> <div onClick="say('d')">WebSocket聊天室</div> <div style="border:1px solid #09F"></div> <input type="text" id="writeMsg"/> <input type="button" value="send" onClick="sendMsg()"/></body> </html>4、服務端：
@ServerEndpoint(value = "/websocket/tui") public class WebSocketDemo{private static final String GUEST_PREFIX = "Guest";private static final AtomicInteger connectionIds = new AtomicInteger(0);private static final Set<WebSocketDemo> connections = new HashSet<>();private final String nickname;private Session session;public WebSocketDemo() {nickname = GUEST_PREFIX + connectionIds.getAndIncrement();}//建立連接 @OnOpenpublic void start(Session session) {this.session = session;connections.add(this);String message = String.format("* %s %s", nickname, "has joined.");System.out.println(message);}//接受消息 @OnMessagepublic void incoming(String message) {System.out.println(message.toString());//broadcast(filteredMessage); broadcast(message.toString());}//客戶端關閉了連接 @OnClosepublic void end() {connections.remove(this);String message = String.format("* %s %s", nickname, "has disconnected.");System.out.println(message);//broadcast(message); }//WebSocket服務出錯 @OnErrorpublic void onError(Throwable t){//log.error("Chat Error: " + t.toString(), t);System.out.println("server has an error!");}private static void broadcast(String msg) {for (WebSocketDemo client : connections) {try {synchronized (client) {client.session.getBasicRemote().sendText(msg);}} catch (IOException e) {//log.debug("Chat Error: Failed to send message to client", e); connections.remove(client);try {client.session.close();} catch (IOException e1) {// Ignore }String message = String.format("* %s %s",client.nickname, "has been disconnected.");broadcast(message);}}} }注意事項：
???????? 1、訪問攔截器
???????? 2、注意部署的包沖突，例如：javax.websocket只是編譯需要，而發布不需要，maven依賴注意適用范圍
???????? 附：
<!--websocket編譯需要，發布不需要--> <!-- https://mvnrepository.com/artifact/org.apache.tomcat/tomcat-coyote --> <dependency><groupId>org.apache.tomcat</groupId><artifactId>tomcat-coyote</artifactId><version>7.0.12</version> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.tomcat/tomcat-juli --> <dependency><groupId>org.apache.tomcat</groupId><artifactId>tomcat-juli</artifactId><version>8.5.3</version> </dependency> <!-- https://mvnrepository.com/artifact/javax.websocket/javax.websocket-api --> <dependency><groupId>javax.websocket</groupId><artifactId>javax.websocket-api</artifactId><version>1.1</version><scope>provided</scope> </dependency>?
轉載于:https://www.cnblogs.com/yuan951/p/6245845.html
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