How to get the actual path printed? I have setup an FTP server on my mobile device and I want to listen to any file arrivals on one of my folders on my mobile. So far I have managed to upload and download files to my remote folder using Apache commons net library but I am not able to use watch service to monitor the remote folder.
It works perfect for local directory though. Since Shailesh says:. KK says:. Abhishek says:. Ragav says:. Ramana Reddy says:. Anonymous says:. Shyam says:. Bhushan says:. Vishal says:. Pradyumna Swain says:. Zahid Indher says:. Sunny says:. Like Join the DZone community and get the full member experience. Join For Free. Learn more about watching files with Java NIO. You may also like: Java IO and NIO When the service detects an event of interest, it is forwarded to the registered process and handled as needed.
This is basically how it works: The first step is to create a new WatchService by using the newWatchService method of the FileSystem class. Next, we register a Path instance for the folder to be monitored with the types of events that we are interested in. And at last, we implement an infinite loop to wait for incoming events. When an event occurs, the key is signaled and placed into the watcher's queue.
After processing its events, we need to put it back into a ready state by invoking its reset method. If it returns false, the key is no longer valid and the loop can exit.
Opinions expressed by DZone contributors are their own. Active Oldest Votes. Improve this answer. This one is good library. But it sounds that it uses polling technique while I want asynchronous events for filesystem change. Anyhow, I will explore this lib more. Yes, I have capability to import add libraries. FileSystem and WatchService for more info refer Oracle tutorial. Anish Dasappan Anish Dasappan 2 2 silver badges 9 9 bronze badges.
Adriano Repetti Adriano Repetti Information provided is very helpful. Actually i am looking for JNI call to do same but NativeCall you mentioned very much matched with my requirement. Adriano I don't understand any of that. If they don't exist, you can't do it at all. EJP I guess I've not been so clear! What I mean is: it can be done with native code even if with some effort then he'll just have to write few C functions for JNI interface. WatchDir uses a single thread to process all events, so it blocks keyboard input while waiting for events.
Either run the program in a separate window, or in the background, as follows:. Play with creating, deleting, and editing files in the test directory. When any of these events occurs, a message is printed to the console. When you have finished, delete the test directory and WatchDir exits. Or, if you prefer, you can manually kill the process. You can also watch an entire file tree by specifying the -r option.
When you specify -r , WatchDir walks the file tree , registering each directory with the watch service. The first step is to create a new WatchService by using the newWatchService method in the FileSystem class, as follows:. Next, register one or more objects with the watch service. Any object that implements the Watchable interface can be registered.
The Path class implements the Watchable interface, so each directory to be monitored is registered as a Path object. As with any Watchable , the Path class implements two register methods. This page uses the two-argument version, register WatchService, WatchEvent. The three-argument version takes a WatchEvent. Modifier , which is not currently implemented.
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