<properties> 
 <endorsed.dir>${project.build.directory}/endorsed</endorsed.dir> 
 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> 
</properties> 
 
<dependencies> 
 <dependency> 
  <groupId>javax</groupId> 
  <artifactId>javaee-api</artifactId> 
  <version>7.0</version> 
  <scope>provided</scope> 
 </dependency> 
</dependencies> 
 
<build> 
 <plugins> 
  <plugin> 
   <groupId>org.apache.maven.plugins</groupId> 
   <artifactId>maven-compiler-plugin</artifactId> 
   <version>3.1</version> 
   <configuration> 
    <source>1.7</source> 
    <target>1.7</target> 
    <compilerArguments> 
     <endorseddirs>${endorsed.dir}</endorseddirs> 
    </compilerArguments> 
   </configuration> 
  </plugin> 
  <plugin> 
   <groupId>org.apache.maven.plugins</groupId> 
   <artifactId>maven-war-plugin</artifactId> 
   <version>2.3</version> 
   <configuration> 
    <failOnMissingWebXml>false</failOnMissingWebXml> 
   </configuration> 
  </plugin> 
  <plugin> 
   <groupId>org.apache.maven.plugins</groupId> 
   <artifactId>maven-dependency-plugin</artifactId> 
   <version>2.6</version> 
   [..] 
  </plugin> 
 </plugins> 
</build> 

plugin> 
 <groupId>org.glassfish.embedded</groupId> 
 <artifactId>maven-embedded-glassfish-plugin</artifactId> 
 <version>4.0</version> 
 <configuration> 
  <goalPrefix>embedded-glassfish</goalPrefix> 
  <app>${basedir}/target/${project.artifactId}-${project.version}.war</app> 
  <autoDelete>true</autoDelete> 
  <port>8080</port> 
  <name>${project.artifactId}</name> 
  <contextRoot>hascode</contextRoot> 
 </configuration> 
 <executions> 
  <execution> 
   <goals> 
    <goal>deploy</goal> 
   </goals> 
  </execution> 
 </executions> 
</plugin> 

package com.hascode.tutorial; 
 
import java.io.IOException; 
import java.util.logging.Level; 
import java.util.logging.Logger; 
 
import javax.websocket.EncodeException; 
import javax.websocket.OnMessage; 
import javax.websocket.OnOpen; 
import javax.websocket.Session; 
import javax.websocket.server.PathParam; 
import javax.websocket.server.ServerEndpoint; 
 
@ServerEndpoint(value = "/chat/{room}", encoders = ChatMessageEncoder.class, decoders = ChatMessageDecoder.class) 
public class ChatEndpoint { 
 private final Logger log = Logger.getLogger(getClass().getName()); 
 
 @OnOpen 
 public void open(final Session session, @PathParam("room") final String room) { 
  log.info("session openend and bound to room: " + room); 
  session.getUserProperties().put("room", room); 
 } 
 
 @OnMessage 
 public void onMessage(final Session session, final ChatMessage chatMessage) { 
  String room = (String) session.getUserProperties().get("room"); 
  try { 
   for (Session s : session.getOpenSessions()) { 
    if (s.isOpen() 
      && room.equals(s.getUserProperties().get("room"))) { 
     s.getBasicRemote().sendObject(chatMessage); 
    } 
   } 
  } catch (IOException | EncodeException e) { 
   log.log(Level.WARNING, "onMessage failed", e); 
  } 
 } 
} 

package com.hascode.tutorial; 
 
import java.util.Date; 
 
public class ChatMessage { 
 private String message; 
 private String sender; 
 private Date received; 
 
 // 其他getter,setter方法 
} 

package com.hascode.tutorial; 
 
import java.io.StringReader; 
import java.util.Date; 
 
import javax.json.Json; 
import javax.json.JsonObject; 
import javax.websocket.DecodeException; 
import javax.websocket.Decoder; 
import javax.websocket.EndpointConfig; 
 
public class ChatMessageDecoder implements Decoder.Text<ChatMessage> { 
 @Override 
 public void init(final EndpointConfig config) { 
 } 
 
 @Override 
 public void destroy() { 
 } 
 
 @Override 
 public ChatMessage decode(final String textMessage) throws DecodeException { 
  ChatMessage chatMessage = new ChatMessage(); 
  JsonObject obj = Json.createReader(new StringReader(textMessage)) 
    .readObject(); 
  chatMessage.setMessage(obj.getString("message")); 
  chatMessage.setSender(obj.getString("sender")); 
  chatMessage.setReceived(new Date()); 
  return chatMessage; 
 } 
 
 @Override 
 public boolean willDecode(final String s) { 
  return true; 
 } 
} 

package com.hascode.tutorial; 
 
import javax.json.Json; 
import javax.websocket.EncodeException; 
import javax.websocket.Encoder; 
import javax.websocket.EndpointConfig; 
 
public class ChatMessageEncoder implements Encoder.Text<ChatMessage> { 
 @Override 
 public void init(final EndpointConfig config) { 
 } 
 
 @Override 
 public void destroy() { 
 } 
 
 @Override 
 public String encode(final ChatMessage chatMessage) throws EncodeException { 
  return Json.createObjectBuilder() 
    .add("message", chatMessage.getMessage()) 
    .add("sender", chatMessage.getSender()) 
    .add("received", chatMessage.getReceived().toString()).build() 
    .toString(); 
 } 
} 

<!DOCTYPE html> 
<html lang="en"> 
<head> 
[..] 
<script> 
 var wsocket; 
 var serviceLocation = "ws://0.0.0.0:8080/hascode/chat/"; 
 var $nickName; 
 var $message; 
 var $chatWindow; 
 var room = ''; 
 
 function onMessageReceived(evt) { 
  //var msg = eval('(' + evt.data + ')'); 
  var msg = JSON.parse(evt.data); // native API 
  var $messageLine = $('<tr><td class="received">' + msg.received 
    + '</td><td class="user label label-info">' + msg.sender 
    + '</td><td class="message badge">' + msg.message 
    + '</td></tr>'); 
  $chatWindow.append($messageLine); 
 } 
 function sendMessage() { 
  var msg = '{"message":"' + $message.val() + '", "sender":"' 
    + $nickName.val() + '", "received":""}'; 
  wsocket.send(msg); 
  $message.val('').focus(); 
 } 
 
 function connectToChatserver() { 
  room = $('#chatroom option:selected').val(); 
  wsocket = new WebSocket(serviceLocation + room); 
  wsocket.onmessage = onMessageReceived; 
 } 
 
 function leaveRoom() { 
  wsocket.close(); 
  $chatWindow.empty(); 
  $('.chat-wrapper').hide(); 
  $('.chat-signin').show(); 
  $nickName.focus(); 
 } 
 
 $(document).ready(function() { 
  $nickName = $('#nickname'); 
  $message = $('#message'); 
  $chatWindow = $('#response'); 
  $('.chat-wrapper').hide(); 
  $nickName.focus(); 
 
  $('#enterRoom').click(function(evt) { 
   evt.preventDefault(); 
   connectToChatserver(); 
   $('.chat-wrapper h2').text('Chat # '+$nickName.val() + "@" + room); 
   $('.chat-signin').hide(); 
   $('.chat-wrapper').show(); 
   $message.focus(); 
  }); 
  $('#do-chat').submit(function(evt) { 
   evt.preventDefault(); 
   sendMessage() 
  }); 
 
  $('#leave-room').click(function(){ 
   leaveRoom(); 
  }); 
 }); 
</script> 
</head> 
 
<body> 
 
 <div class="container chat-signin"> 
  <form class="form-signin"> 
   <h2 class="form-signin-heading">Chat sign in</h2> 
   <label for="nickname">Nickname</label> <input type="text" 
    class="input-block-level" placeholder="Nickname" id="nickname"> 
   <div class="btn-group"> 
    <label for="chatroom">Chatroom</label> <select size="1" 
     id="chatroom"> 
     <option>arduino</option> 
     <option>java</option> 
     <option>groovy</option> 
     <option>scala</option> 
    </select> 
   </div> 
   <button class="btn btn-large btn-primary" type="submit" 
    id="enterRoom">Sign in</button> 
  </form> 
 </div> 
 <!-- /container --> 
 
 <div class="container chat-wrapper"> 
  <form id="do-chat"> 
   <h2 class="alert alert-success"></h2> 
   <table id="response" class="table table-bordered"></table> 
   <fieldset> 
    <legend>Enter your message..</legend> 
    <div class="controls"> 
     <input type="text" class="input-block-level" placeholder="Your message..." id="message" style="height:60px"/> 
     <input type="submit" class="btn btn-large btn-block btn-primary" 
      value="Send message" /> 
     <button class="btn btn-large btn-block" type="button" id="leave-room">Leave 
      room</button> 
    </div> 
   </fieldset> 
  </form> 
 </div> 
</body> 
</html>