我在贾瓦有一个方案(有一个支部),我只想有一个例子。 如果它试图打开另一个方案的例子,我就希望把目前的事例带到地下。
我如何这样做?
提前感谢。
采用 Java Webstart and implementing the SingleInstanceservice/code>
of the demo. of the SingleInstanceservice
。
如果它试图打开另一个方案的例子,我就希望把目前的事例带到地下。
Hook that up in the newActivation(String[] of thecode>SingleInstanceListener。 将通过为新发射提供的任何论点。 现有案例可以决定与新的动力是什么(例如,变更档案,增加新的表格,忽视)。
您可以使用ShutDownHook和24个档案,见这一简单的。
I think that it is the simplest way ...
Java没有先入手,但你可以在(或/瓦尔/伦)的温室簿上创建假档案。 (And make it File.deleteOnExit (
to Clean it anyway onwal)
To bring the existing window to top, you may notify the program yourself, thru named pipe, unix socket, or java remote method call, etc. A simple & dirty way is to write to a small file, say $TEMP/foobar-app.bring-to-top
, and the program should periodically poll this small file, if it comes to exist, bring the window to top and remove this small file.
I guess Javast处理信号,即:lu-HUP PID
可能不适用于 Java的申请。 即便是这样,也并非每个顾问都有信号。
我曾用一份Socket和一份服务器名册这样做:
首先,在您开始申请时,请在以下几个港口听取意见:ServerSocket。 trick是为了检查它是否扔下了<条码>。 如果是的话,则有另一项申请,或者另一个申请使用该港口(TCP Socket(保证您的联系到达;UDP确实有t)。
例如:
ServerSocket ss = null;
try {
ss = new ServerSocket(4004);
} catch (IOException ex0) {
// Port either occupied by your application or a foreign one
// -> Connect
Socket s = null;
try {
s = new Socket();
} catch (Exception ex1) {
// Something went wrong
}
if (s != null) {
// Send some singnal
}
}
if (ss == null) {
// Close or do something else
}
(我从我的记忆中写道,某些事情可能是错误的,或者可以做得更好)。
在C#中,你通常在Applicaiton开始创建Mutex。 如果你不能建立/提出,则另一个申请的例子已经开始。 不幸的是,如果在 Java采取同样的做法,或者确切的辛迪加的话,我就不敢肯定。
希望这一帮助。
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