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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{ | |
} | |
} | |
} |
Doesn't work with Tomcat 9
Can want java code for client side not the javascript code can anyone provide me plz.TQ
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
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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This is a great code thank you. Going to run it on my site.