基于Tomcat7的WebSocket的程序
在开始学习GUI的SOCKET编程时，就一直有一个梦想，希望有一天能将这种聊天程序在WEB上实现，虽然QQ和许多其它的聊天程序已经实现，但是他们的实现都使用的是AJAX，无非是对AJAX进行改进，或者使用FLEX，个人认为那样实现太复杂，没有研究！！几个星期前终天有时间研究了，使用jetty来编写聊天程序，后来聊天都实现了，但是jetty服务器没有使用过，中间配服务器差不多用了一个星期，让我很纠结，最后在实验室的电脑可以成功运行！！！不过可悲的是当我移植到我的笔记本时，却出现在了各种怪错！！于是，我又纠结了，今天晚上，奇迹的发现tomcat竟然也支持了，所以果然的下载了tomcat7.0.27来测试，惊人的发现与jetty实现相似，所以写了一个小测试程序，测试成功！！下面贴上我的代码，有兴趣的童鞋可以一起学习哦！！！！
index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<script type="text/javascript">
var ws = null;
function startServer() {
var url = "ws:localhost:8080/WebSocketAnnonationTomcat7/echo.ws";
if ('WebSocket' in window) {
ws = new WebSocket(url);
} else if ('MozWebSocket' in window) {
ws = new MozWebSocket(url);
} else {
alert('WebSocket is not supported by this browser.');
return;
}
ws.onopen = function() {
alert("connect success!");
};
ws.onmessage = function(event) {
alert("revice mess:" + event.data);
};
ws.onclose = function() {
alert("close connect..");
};
}
function sendMessage(){
var txtMsg=document.getElementById("msg").value;
if(ws!=null && txtMsg!=''){
ws.send(txtMsg);
}
}
</script>
</head>
<body onload="startServer()">
<input type="text" id="msg" value="" size="20" />
<input type="button" onclick="sendMessage();" value="发送" />
</body>
</html>servlet具体实现:
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.util.logging.Logger;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import org.apache.catalina.websocket.MessageInbound;
import org.apache.catalina.websocket.StreamInbound;
import org.apache.catalina.websocket.WsOutbound;
/**
* Tomcat7 WebSocket的簡單應用, WebSocket的servlet接口集成自webSocketServlet,实质为Serlet
* <p>功能描述,该部分必须以中文句号结尾。<p>
*
* 创建日期 2013-7-21<br>
* @author longgangbai <br>
* @version $Revision$ $Date$
* @since 3.0.0
*/
public class WebSocketExtServlet extends
org.apache.catalina.websocket.WebSocketServlet {
//
private Logger logger=Logger.getLogger(WebSocketExtServlet.class.getSimpleName());
private static final long serialVersionUID = 1L;
@Override
protected StreamInbound createWebSocketInbound(String subProtocol, HttpServletRequest arg1) {
logger.info(";request ws servelt");
return new MessageInbound(){
@Override
protected void onClose(int status){
logger.info(";web socket closed :"+status);
}
@Override
protected void onOpen(WsOutbound outbound){
logger.info(";web socket onOpen !");
}
@Override
protected void onBinaryMessage(ByteBuffer buff) throws IOException {
// TODO Auto-generated method stub
logger.info(";web socket Received : !"+buff.remaining());
}
@Override
protected void onTextMessage(CharBuffer buff) throws IOException {
logger.info(";web socket Received : !"+buff.remaining());
//getWsOutbound可以返回当前的WsOutbound,通过他向客户端返回数据,这里采用nio的CharBuffer
for (int j = 0; j < 50; j++) {
try {
Thread.sleep(2000);
this.getWsOutbound().writeTextMessage(CharBuffer.wrap(String.valueOf(j)));
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
};
}
}<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>WebSocketTomcat7</display-name>
<servlet>
<servlet-name>websocket</servlet-name>
<servlet-class>com.easyway.websocket.WebSocketExtServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>websocket</servlet-name>
<url-pattern>/echo.ws</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>
需要说明的是，在开发的时候必须在tomcat的lib目录下拷贝两个JAR包：catalina.jar tomcat-coyote.jar
但当你运行的时候必须将这两个包删除，否则，会与tomcat的包冲突！！！！！
他们类的关系，也有一定的理解，今天暂时写到这里吧！！
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