Java EE 7中对WebSocket 1.0的支持

最新推荐文章于 2021-02-25 11:45:26 发布
zhongweij
最新推荐文章于 2021-02-25 11:45:26 发布
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原文链接：http://www.javaarch.net/jiagoushi/749.htm
 Java EE 7中对WebSocket 1.0的支持
 
 
 1.server端
 
 pom依赖：
 
	<dependency>
		<groupId>javax</groupId>
		<artifactId>javaee-api</artifactId>
		<version>7.0-b82</version>
		<scope>provided</scope>
	</dependency>
	
src/main/java/com/hmkcode/MyServerEndpoint.java

	package com.hmkcode;
	 
	import java.io.IOException;
	import java.util.LinkedList;
	import javax.websocket.EncodeException;
	import javax.websocket.OnClose;
	import javax.websocket.OnMessage;
	import javax.websocket.OnOpen;
	import javax.websocket.Session;
	import javax.websocket.server.PathParam;
	import javax.websocket.server.ServerEndpoint;
	 
	@ServerEndpoint(value="/websocket/{client-id}")
	public class MyServerEndpoint {
	 
		private static final LinkedList<Session> clients = new LinkedList<Session>();
	 
		@OnOpen
		public void onOpen(Session session) {
			clients.add(session);
		}
		@OnMessage
		public void onMessage(String message,@PathParam("client-id") String clientId) {
			for (Session client : clients) {
				try {
					client.getBasicRemote().sendObject(clientId+": "+message);            
	 
				} catch (IOException e) {
					e.printStackTrace();
				} catch (EncodeException e) {
					e.printStackTrace();
				}
			}
		}
		@OnClose
		public void onClose(Session peer) {
			clients.remove(peer);
		}
	}
	
@ServerEndpoint(value=”/websocket/{client-id}”)是client连接的url地址，{client-id}是每个client连接的名称标识。
@onOpen，@onMessag和@onClose是对应的每个session连接生命周期的回调函数

2. websocket客户端（桌面端）

pom依赖：

	<dependency>
		<groupId>javax</groupId>
		<artifactId>javaee-api</artifactId>
		<version>7.0-b82</version>
	</dependency>
	<dependency>
		<groupId>org.glassfish.tyrus</groupId>
		<artifactId>tyrus-client</artifactId>
		<version>1.0-rc3</version>
	</dependency>
	<dependency>
		<groupId>org.glassfish.tyrus</groupId>
		<artifactId>tyrus-container-grizzly</artifactId>
		<version>1.0-rc3</version>
	</dependency>
	
src/main/java/com/hmkcode/MyClient.java

	package com.hmkcode;
	 
	import java.io.IOException;
	import javax.websocket.ClientEndpoint;
	import javax.websocket.OnError;
	import javax.websocket.OnMessage;
	import javax.websocket.OnOpen;
	import javax.websocket.Session;
	 
	@ClientEndpoint
	public class MyClient {
		@OnOpen
		public void onOpen(Session session) {
			System.out.println("Connected to endpoint: " + session.getBasicRemote());
			try {
				session.getBasicRemote().sendText("Hello");
			} catch (IOException ex) {
			}
		}
	 
		@OnMessage
		public void onMessage(String message) {
			System.out.println(message);
		}
	 
		@OnError
		public void onError(Throwable t) {
			t.printStackTrace();
		}
	}
	
src/main/java/com/hmkcode/App.java

	package com.hmkcode;
	 
	import java.io.BufferedReader;
	import java.io.IOException;
	import java.io.InputStreamReader;
	import java.net.URI;
	import javax.websocket.ContainerProvider;
	import javax.websocket.DeploymentException;
	import javax.websocket.Session;
	import javax.websocket.WebSocketContainer;
	 
	public class App {
	 
		public Session session;
	 
		protected void start()
				 {
	 
				WebSocketContainer container = ContainerProvider.getWebSocketContainer();
	 
				String uri = "ws://localhost:8080/websocket-glassfish-server/websocket/desktop-client";
				System.out.println("Connecting to " + uri);
				try {
					session = container.connectToServer(MyClient.class, URI.create(uri));
				} catch (DeploymentException e) {
					e.printStackTrace();
				} catch (IOException e) {
					e.printStackTrace();
				}             
	 
		}
		public static void main(String args[]){
			App client = new App();
			client.start();
	 
			BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
			String input = "";
			try {
				do{
					input = br.readLine();
					if(!input.equals("exit"))
						client.session.getBasicRemote().sendText(input);
	 
				}while(!input.equals("exit"));
	 
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
	
3. client web客户端

/src/main/webapp/index.htm

	<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
	<html xmlns="http://www.w3.org/1999/xhtml">
	 
	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
	<title>Java API for WebSocket (JSR-356)</title>
	<link href="bootstrap/css/bootstrap.min.css" rel="stylesheet" type="text/css" />
	<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
	<script src="websocket.js" type="text/javascript"></script>
	</head>
	<body>
		<div class="container">
			<h1>Java API for WebSocket (JSR-356)</h1>
			<div>
				<span id="status" class="label label-important">Not Connected</span> 
			</div>    
			<br/>
	 
			<label style="display:inline-block">Message: </label><input type="text" id="message"  />
			<button id="send" class="btn btn-primary" οnclick="sendMessage()">Send</button>
	 
			<table id="received_messages" class="table table-striped">
				<tr>
					<th>#</th>
					<th>Sender</th>
					<th>Message</th>
				</tr>
			</table>
		</div>
	</body>
	</html>
	
/src/main/webapp/websocket.js


	var URL = "ws://localhost:8080/websocket-glassfish-server/websocket/web-client";
	var websocket;
	 
	$(document).ready(function(){
		connect();  
	});
	 
	function connect(){
			websocket = new WebSocket(URL);
			websocket.onopen = function(evnt) { onOpen(evnt) };
			websocket.onmessage = function(evnt) { onMessage(evnt) };
			websocket.onerror = function(evnt) { onError(evnt) };
	}
	function sendMessage() {
		websocket.send($("#message").val());
	}
	function onOpen() {
		updateStatus("connected")
	}
	function onMessage(evnt) {
		if (typeof evnt.data == "string") {
	 
			$("#received_messages").append(
							$('<tr/>')
							.append($('<td/>').text("1"))
							.append($('<td/>').text(evnt.data.substring(0,evnt.data.indexOf(":"))))
							.append($('<td/>').text(evnt.data.substring(evnt.data.indexOf(":")+1))));
		} 
	}
	function onError(evnt) {
		alert('ERROR: ' + evnt.data);
	}
	function updateStatus(status){
		if(status == "connected"){
			$("#status").removeClass (function (index, css) {
			   return (css.match (/\blabel-\S+/g) || []).join(' ')
			});
			$("#status").text(status).addClass("label-success");
		}
	}
	
不过web端需要在支持websokcet的应用服务器上跑。