首先建立一个xhtml文件，然后代码为：
<?xml version="1.0" encoding="UTF-8"?>
<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<title>Apache Tomcat WebSocket Examples: Chat</title>
<style type="text/css"><![CDATA[
input#chat {
width: 410px
}
#console-container {
width: 400px;
}
#console {
border: 1px solid #CCCCCC;
border-right-color: #999999;
border-bottom-color: #999999;
height: 170px;
overflow-y: scroll;
padding: 5px;
width: 100%;
}
#console p {
padding: 0;
margin: 0;
}
]]></style>
<script type="application/javascript"><![CDATA[
"use strict";
var Chat = {};
Chat.socket = null;
Chat.connect = (function(host) {
if ('WebSocket' in window) {
Chat.socket = new WebSocket(host);
} else if ('MozWebSocket' in window) {
Chat.socket = new MozWebSocket(host);
} else {
Console.log('Error: WebSocket is not supported by this browser.');
return;
}
Chat.socket.onopen = function () {
Console.log('Info: WebSocket connection opened.');
document.getElementById('chat').onkeydown = function(event) {
if (event.keyCode == 13) {
Chat.sendMessage();
}
};
};
Chat.socket.onclose = function () {
document.getElementById('chat').onkeydown = null;
Console.log('Info: WebSocket closed.');
};
Chat.socket.onmessage = function (message) {
Console.log(message.data);
};
});
Chat.initialize = function() {
if (window.location.protocol == 'http:') {
Chat.connect('ws://' + window.location.host + '/websocket/chat');
} else {
Chat.connect('wss://' + window.location.host + '/websocket/chat');
}
};
Chat.sendMessage = (function() {
var message = document.getElementById('chat').value;
if (message != '') {
Chat.socket.send(message);
document.getElementById('chat').value = '';
}
});
var Console = {};
Console.log = (function(message) {
var console = document.getElementById('console');
var p = document.createElement('p');
p.style.wordWrap = 'break-word';
p.innerHTML = message;
console.appendChild(p);
while (console.childNodes.length > 25) {
console.removeChild(console.firstChild);
}
console.scrollTop = console.scrollHeight;
});
Chat.initialize();
document.addEventListener("DOMContentLoaded", function() {
// Remove elements with "noscript" class - <noscript> is not allowed in XHTML
var noscripts = document.getElementsByClassName("noscript");
for (var i = 0; i < noscripts.length; i++) {
noscripts[i].parentNode.removeChild(noscripts[i]);
}
}, false);
]]></script>
</head>
<body>
<div class="noscript"><h2 style="color: #ff0000">Seems your browser doesn't support Javascript! Websockets rely on Javascript being enabled. Please enable
Javascript and reload this page!</h2></div>
<div>
<p>
<input type="text" placeholder="type and press enter to chat" id="chat" />
</p>
<div id="console-container">
<div id="console"/>
</div>
</div>
</body>
</html>然后再src中创建一个包，和一个java类：
package com.cqvie;
import java.io.IOException;
import java.nio.ByteBuffer;
import javax.websocket.OnMessage;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;
@ServerEndpoint(value="/chat")
public class Chat {
@OnMessage
public void echoTextMessage(Session session, String msg, boolean last) {
try {
if (session.isOpen()) {
session.getBasicRemote().sendText("�ظ�:"+msg, last);
}
} catch (IOException e) {
try {
session.close();
} catch (IOException e1) { }
}
}
@OnMessage
public void echoBinaryMessage(Session session, ByteBuffer bb,
boolean last) {
try {
if (session.isOpen()) {
session.getBasicRemote().sendBinary(bb, last);
}
} catch (IOException e) {
try {
session.close();
} catch (IOException e1) { }
}
}
}
这样就可以实现输入消息，然后根据发送的消息返回到文本域里面。
android端代码实现websocket发送，采用了okhttp来创建的（okhttp需要先导包，没有的需要先下载）：
package com.example.websocket_test;
import okhttp3.*;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity {
TextView tv;
Button bConnect,bSend;
OkHttpClient okHttpClient;
WebSocket ws;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv=(TextView)findViewById(R.id.textview1);
bConnect=(Button)findViewById(R.id.button1);
bSend=(Button)findViewById(R.id.button2);
bConnect.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
okHttpClient=new OkHttpClient();
String ip="10.0.2.2";
Request request=new Request.Builder().url("ws://"+ip+":8080/websocket/chat").build();
//�����µ�����
ws= okHttpClient.newWebSocket(request,new Listener());
}
});
bSend.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ws.send("Hello!"); //��������
}
});
}
private class Listener extends WebSocketListener{
@Override
public void onOpen(WebSocket webSocket, Response response) {
super.onOpen(webSocket, response);
}
@Override
public void onMessage(WebSocket webSocket,final String text) {
super.onMessage(webSocket, text);
runOnUiThread(new Runnable() {
@Override
public void run() {
tv.append("\n"+text);
}
});
}
@Override
public void onClosed(WebSocket webSocket, int code, String reason) {
super.onClosed(webSocket, code, reason);
}
@Override
public void onFailure(WebSocket webSocket, Throwable t, Response response) {
super.onFailure(webSocket, t, response);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}