AIR与Flex web应用的另一区别在于可以动态监测网络状态，可以让开发者在网络连通或断线时用不同的方式处理程序，在Demo中我将用以下情况来表现AIR的离线与在线应用。
1. 用户在文本框中输入内容。文本框下方的保存按钮会动态显示当前网络状态: (在线)保存与(离线)保存.
2. 在用户点击保存按钮时如果网络在线，将对话框内容保存在服务器。
3. 如果保存时处于断线状态，将内容保存在本地文件中。
4. 当网络恢复时检查本地文件，如果有已经保存的内容，将内容传入服务器。
源代码很简单，不到100行，大家可以在最下方下载。现在我开始讲解
Demo操作方法
1. 按装运行demo，如果网络连接正常，你会看到文本框下的按钮为 (在线) 保存。
2. 输入任意信息，点击 （在线）保存 。你会看倒信息 “内容已上传服务器”。
3. 切断网络。大概3－5秒后你会看到文本框下方按钮变为（离线）保存。
4. 点击保存，你会看倒信息“内容已经在本地保存，会在下次连线时自动上传到服务器”。
5. 接痛网络,大概3－－5秒后你会看倒信息 “缓存内容已上传服务器”。
6. Demo结束。
1. 启动应用程序后监控网络状态。
我们在 App的CreationComplete()中调用netWorkSyc来监控网络状态。
private function networkSyc():void{
//创建一个联接，使用HEAD表示不需要加载玩全部的页面。
var request:URLRequest = new URLRequest( “http://www.google.com”);
request.method = “HEAD”;
//用url创建监测对象，每3秒检查一次网络状态，如果网络状态发生变化，将结果返回到netWorkStatusHandle()
urlMonitor = new URLMonitor(request);
urlMonitor.pollInterval = 3000;
urlMonitor.addEventListener(StatusEvent.STATUS,netWorkStatusHandle);
urlMonitor.start();
}
//网络状态改变时响应该事件
private function netWorkStatusHandle(e:StatusEvent):void{
if(urlMonitor.available){
//如果有本地文件，假装上传服务器
if(this.checkLoaclFile()){
//Kevin TODO 上传服务骑
this.showAlert(“缓存内容已上传服务器”);
}
saveBtn.label = “（在线）保存”
}else{
saveBtn.label = “（离线）保存”
}
}
上面的networkSyc()方法中我使用了两个类的对象来实现网络监控，URLRequest 和 URLMonitor。我用URLRequest来建立一个连接对象request，连接的地址是www.google.com。然后已request作为构造参数创建URLMonitor对象。我就是靠它来完成对网络状态的监控。
监控原理很简单，当第一次执行networkSyc()时，urlMonitor会尝试连接www.google.com，然后将连接的结果发回到 netWorkStatusHandle(), 如果连接成功，urlMonitor.available会为true,反之为false。接下来每3秒检查一次网络状态，如果发生改变(连接成功变为连接失败或者连接失败变为连接成功)，那么将再度触发StatusEvent.STATUS事件，调用netWorkStatusHandle()返回网络状态。
以上就是AIR监控网络的方式，大家如果感兴趣想知道更多URLMonitor的内容，可以在Help中搜索ServiceMonitor,它的sub class就是URLMonitor和SockterMonitor。
Demo中并没有真正在本地保存文件，保存与读取文件的方法我会在下一篇教程–“AIR的文件操作”中教给大家。
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[...] 转自:http://www.flextheworld.com/2009/01/adobe-air-web-status.html [...]
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