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July 7, 2012 01:44
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How to use WebSocket of Tomcat
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset=UTF-8> | |
| <title>Tomcat WebSocket Chat</title> | |
| <script> | |
| var ws = new WebSocket("ws://localhost:8080/TomcatWebSocket/wschat/WsChatServlet"); | |
| ws.onopen = function(){ | |
| }; | |
| ws.onmessage = function(message){ | |
| document.getElementById("chatlog").textContent += message.data + "\n"; | |
| }; | |
| function postToServer(){ | |
| ws.send(document.getElementById("msg").value); | |
| document.getElementById("msg").value = ""; | |
| } | |
| function closeConnect(){ | |
| ws.close(); | |
| } | |
| </script> | |
| </head> | |
| <body> | |
| <textarea id="chatlog" readonly></textarea><br/> | |
| <input id="msg" type="text" /> | |
| <button type="submit" id="sendButton" onClick="postToServer()">Send!</button> | |
| <button type="submit" id="sendButton" onClick="closeConnect()">End</button> | |
| </body> | |
| </html> |
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| <?xml version="1.0" encoding="UTF-8"?> | |
| <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" | |
| xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | |
| xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> | |
| <servlet> | |
| <servlet-name>WsChatServlet</servlet-name> | |
| <servlet-class>wsapp.WsChatServlet</servlet-class> | |
| </servlet> | |
| <servlet-mapping> | |
| <servlet-name>WsChatServlet</servlet-name> | |
| <url-pattern>/wschat/WsChatServlet</url-pattern> | |
| </servlet-mapping> | |
| </web-app> |
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| //This sample is how to use websocket of Tomcat. | |
| package wsapp; | |
| import java.io.IOException; | |
| import java.nio.ByteBuffer; | |
| import java.nio.CharBuffer; | |
| import java.util.ArrayList; | |
| import org.apache.catalina.websocket.MessageInbound; | |
| import org.apache.catalina.websocket.StreamInbound; | |
| import org.apache.catalina.websocket.WebSocketServlet; | |
| import org.apache.catalina.websocket.WsOutbound; | |
| public class WsChatServlet extends WebSocketServlet{ | |
| private static final long serialVersionUID = 1L; | |
| private static ArrayList<MyMessageInbound> mmiList = new ArrayList<MyMessageInbound>(); | |
| public StreamInbound createWebSocketInbound(String protocol){ | |
| return new MyMessageInbound(); | |
| } | |
| private class MyMessageInbound extends MessageInbound{ | |
| WsOutbound myoutbound; | |
| @Override | |
| public void onOpen(WsOutbound outbound){ | |
| try { | |
| System.out.println("Open Client."); | |
| this.myoutbound = outbound; | |
| mmiList.add(this); | |
| outbound.writeTextMessage(CharBuffer.wrap("Hello!")); | |
| } catch (IOException e) { | |
| e.printStackTrace(); | |
| } | |
| } | |
| @Override | |
| public void onClose(int status){ | |
| System.out.println("Close Client."); | |
| mmiList.remove(this); | |
| } | |
| @Override | |
| public void onTextMessage(CharBuffer cb) throws IOException{ | |
| System.out.println("Accept Message : "+ cb); | |
| for(MyMessageInbound mmib: mmiList){ | |
| CharBuffer buffer = CharBuffer.wrap(cb); | |
| mmib.myoutbound.writeTextMessage(buffer); | |
| mmib.myoutbound.flush(); | |
| } | |
| } | |
| @Override | |
| public void onBinaryMessage(ByteBuffer bb) throws IOException{ | |
| } | |
| } | |
| } |
I am trying Dr. Danny Coward's code on pp6 of his Websocket book but has been returning an 'undefined' error for years. Could someone look at Dr. Coward's code and tell where I am getting wrong.
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how to solve this error
error: package org.apache.catalina.websocket does not exist
import org.apache.catalina.websocket.MessageInbound;
Note : already import org.apache.catalina.websocket.* jar file