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App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议 · App Inventor 2 中文网
...。如果成功，则文本在参数 Message 下可用。否则，Message 包含一个空字符串。
发布消息
发布消息有三种方法。
默认发布方式Topic: 消息主题。Message: 消息字符串。RetainFlag: 消息是否为保留消息。QoS: 发布消息的...
How to get default gateway in Mac OSX
I need to retrieve the default gateway on a Mac machine. I know that in Linux route -n will give an output from which I can easily retrieve this information. However this is not working in Mac OSX(Snow Leopard).
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Rollback a Git merge
...
Reverting a merge commit has been exhaustively covered in other questions. When you do a fast-forward merge, the second one you describe, you can use git reset to get back to the previous state:
git reset --hard <commit_before_merge>
You can find...
What is the difference between persist() and merge() in JPA and Hibernate?
What is the difference between persist() and merge() in Hibernate?
4 Answers
4
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Eclipse debugger always blocks on ThreadPoolExecutor without any obvious exception, why?
I'm working on my usual projects on Eclipse, it's a J2EE application, made with Spring, Hibernate and so on. I'm using Tomcat 7 for this (no particular reason, I don't exploit any new feature, I just wanted to try that). Every time I debug my application, it happens that Eclipse debugger pops out li...
Regular expression to match DNS hostname or IP Address?
...ll. Also, only one dot is questionable issue. Would be great to have more feedback on that.
– BreakPhreak
Jan 10 '11 at 9:07
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Fastest way to remove first char in a String
...ng is "///foo" it will become "foo" instead of "//foo".
The first option needs a bit more work to understand than the third - I would view the Substring option as the most common and readable.
(Obviously each of them as an individual statement won't do anything useful - you'll need to assign the r...
How do I enable TODO/FIXME/XXX task tags in Eclipse?
.... Apparently this is something that is disabled by default because I have been using those tags for as long as I've been using Eclipse and I have never seen one of them appear in the task list. Can anyone indicate how to enable this feature? I see no preferences option anywhere that says anything to...
How to unescape HTML character entities in Java?
...eHtml4() I get &lt;p&gt;üè&lt;/p&gt;. Is there a way to keep existing html tags intact?
– Nickkk
Jan 13 at 12:10
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How to detect incoming calls, in an Android device?
...roadcastReceiver {
//The receiver will be recreated whenever android feels like it. We need a static variable to remember data between instantiations
private static int lastState = TelephonyManager.CALL_STATE_IDLE;
private static Date callStartTime;
private static boolean isIncomi...