使用Flash的XMLSocket与Servlet建立长连接（1，建立socket控件）

来源：互联网发布：美的网络专供编辑：程序博客网时间：2024/04/27 19:47

使用Flash的XMLSocket与Servlet建立长连接（1，建立socket控件）

适用范围：当服务端需要向客户机主动发送消息的时候

有些情况，客户端发送一个请求，服务段需要一个很长时间的处理，这个时候，客户端
很可能是个白页，且无法响应。而服务端无法向客户机主动发送消息。

该方法适用于以上这种情况，并以一个进度条为例

1. 建立net.swf
    打开Flash新建一个fla文件
    在第一桢创建一个文本组件,名称为lotTxt，用于输出日志
    打开第一桢的脚本编辑器，切换到专家模式，写入如下脚本：
/*
* $RCSfile: com.inet.net.fla,v $
* $Revision: 1.1 $
*
* Copyright (C) 2005 inet, Inc. All rights reserved.
*
* This software is the proprietary information of inet, Inc.
* Use is subject to license terms.
*
* @author: chenyankui
* @Date:   2006-9-28
*/

import flash.external.ExternalInterface;
import com.inet.util.UUID;
import com.inet.util.DateFormat;

// 创建新的 StyleSheet 对象。
var logStyles:TextField.StyleSheet = new TextField.StyleSheet();

logStyles.setStyle("html", {fontFamily: "Arial, Helvetica,sans-serif", fontSize: "18px", color:"#FF0000"});
logStyles.setStyle("body", {color: "#00CCFF", textDecoration:"underline"});

// 将 TextAreaInstance.styleSheet 属性设置为新定义的、名为 styles 的 styleSheet 对象。
logTxt.styleSheet = logStyles;
logTxt.html = true;

var logger:Object = new Object();

var format = "";

var debugEnabled:Boolean = false;
var infoEnabled:Boolean = true;
var logEnabled:Boolean = true;
var warnEnabled:Boolean = true;
var errorEnabled:Boolean = true;

var LogLevel = new Object();

LogLevel["DEBUG"] = 1;
LogLevel["INFO"] = 2;
LogLevel["LOG"] = 3;
LogLevel["WARN"] = 4;
LogLevel["ERROR"] = 5;

logger.debug = function(log:String):Void
{
if(debugEnabled)
{
  logTxt.text += "[DEBUG:" + DateFormat.getTime() + "]: " + log + "/n";
}
}
logger.info = function(log:String):Void
{
if(infoEnabled)
{
  logTxt.text += "[INFO :" + DateFormat.getTime() + "]: " + log + "/n";
}
}
logger.log = function(log:String):Void
{
if(logEnabled)
{
  logTxt.text += "[LOG :" + DateFormat.getTime() + "]: " + log + "/n";
}
}
logger.warn = function(log:String):Void
{
if(warnEnabled)
{
  logTxt.text += "[WARN :" + DateFormat.getTime() + "]: " + log + "/n";
}
}
logger.error = function(log:String):Void
{
if(errorEnabled)
{
  logTxt.text += "[ERROR:" + DateFormat.getTime() + "]: " + log + "/n";
}
}

logger.put = function(log:String):Void
{
logTxt.text += "[INFO :" + DateFormat.getTime() + "]: " + log + "/n";
}

function clrLog():Void
{
logTxt.text = "Macromedia Flash 8 version:" + System.capabilities.version + " ";
}

function setLogLevel(level:String):Number
{
var k = LogLevel[level];

if(k == null)
{
return -1;
}

logger.put("当前日志级别: " + level);

debugEnabled = (LogLevel["DEBUG"] >= k);
infoEnabled = (LogLevel["INFO"] >= k);
logEnabled = (LogLevel["LOG"] >= k);
warnEnabled = (LogLevel["WARN"] >= k);
errorEnabled = (LogLevel["ERROR"] >= k);

logger.put("debugEnabled :" + debugEnabled);
logger.put("infoEnabled :" + infoEnabled);
logger.put("logEnabled :" + logEnabled);
logger.put("warnEnabled :" + warnEnabled);
logger.put("errorEnabled :" + errorEnabled);
}

clrLog();
//logger.put("Macromedia Flash 8 version:" + System.capabilities.version + "");

/*
var df1:DateFormat = new DateFormat("yyyy-MM-dd HH:mm:ss SSS");
var df2:DateFormat = new DateFormat("MM/dd/yy");
var df3:DateFormat = new DateFormat("dd/MM/yy");
var df4:DateFormat = new DateFormat("yyyy年MM月dd日 HH时mm分ss秒 SSS毫秒");

var dt:Date = df1.parse("2004-02-23 13:24:48 789");

logger.info(dt.toString());
logger.info(df1.format(dt));
logger.info(df2.format(dt));
logger.info(df3.format(dt));
logger.info(df4.format(dt));

logger.info("当前时间:" + df1.format(new Date()));

var a:Number = new Date().getTime();

if(uuid.charAt(0) == "-")
{
logger.info("++++++");
}

logger.info("" + a.toString(10));
logger.info("" + a.toString(16));
logger.info("" + (256).toString(16));
logger.info("uuid:" + UUID.getUUID());
logger.info("uuid:" + UUID.getUUID());
logger.info("uuid:" + UUID.getUUID());

logger.info("Number.MIN_VALUE = " + Number.MIN_VALUE);
logger.info("Number.MAX_VALUE = " + Number.MAX_VALUE);
*/

clrBtn.addEventListener("click", clrLog);

var onxml:String     = "$SocketOnXml";
var ondata:String    = "$SocketOnData";
var onclose:String   = "$SocketOnClose";
var onconnect:String = "$SocketOnConnect";

var SOCKET_UUID_PREFIX:String = "NET";
var SOCKET_UUID_SUFFIX:String = "Socket";

var SocketMap:Object = new Object();

function createSocket()
{
var sid = SOCKET_UUID_PREFIX + UUID.getUUID() + SOCKET_UUID_SUFFIX;

SocketMap[sid] = new XMLSocket();

logger.debug("CreateSocket: " + sid);

return sid;
}

function closeSocket(sid:String):Void
{
var skt = SocketMap[sid];

if(skt != null && (skt instanceof XMLSocket))
{
logger.debug("CloseSocket: " + sid);
skt.close();
}
}

function sendString(sid:String, src:String):Void
{
var skt = SocketMap[sid];

if(skt != null && (skt instanceof XMLSocket))
{
logger.debug("Send: " + src);
skt.send(src);
}
}

function addSocketEvent(sid:String):Void
{
if(sid != null && sid != "")
{
  logger.debug("addSocketEvent ......");

  addOnXmlEvent(sid);
  addOnDataEvent(sid);
  addOnCloseEvent(sid);
  addOnConnectEvent(sid);
}
}

function $loadPolicyFile(uri:String):Void
{
if(uri != null)
{
logger.info("加载策略文件:" + uri);
System.security.loadPolicyFile(uri);
}
}

function getSystemProperty(key:String):String
{
return System.capabilities[key];
}

ExternalInterface.addCallback("setLogLevel", null, setLogLevel);

ExternalInterface.addCallback("connect", null, connect);
ExternalInterface.addCallback("closeSocket", null, closeSocket);
ExternalInterface.addCallback("createSocket", null, createSocket);

ExternalInterface.addCallback("sendString", null, sendString);

ExternalInterface.addCallback("addSocketEvent", null, addSocketEvent);

ExternalInterface.addCallback("loadPolicyFile", null, $loadPolicyFile);

ExternalInterface.addCallback("getSystemProperty", null, getSystemProperty);

编译该flash, 按下shift + F12即可。生成net.swf文件。
好了，到此为止创建socket控件的工作已经完成了，接下来就可以使用该控件与ServerSocket通信了。