Java EE 7中对WebSocket 1.0的支持
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" onclick="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。
