jdk 1.7 监听文件目录

最新推荐文章于 2022-07-29 20:22:14 发布

原创最新推荐文章于 2022-07-29 20:22:14 发布 · 1.4k 阅读

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本文介绍了一个使用Java NIO的文件系统监听示例程序，该程序可以监控指定目录下的文件创建、删除及修改事件，并实时打印出发生的事件类型及文件名。

package com;

import java.io.IOException;
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.WatchEvent;
import java.nio.file.WatchKey;
import java.nio.file.WatchService;
import java.util.List;

import static java.nio.file.StandardWatchEventKinds.*;
public class Test {
WatchService watch;

public Test(Path path) throws IOException {
watch = FileSystems.getDefault().newWatchService();
path.register(watch,ENTRY_CREATE,ENTRY_DELETE,ENTRY_MODIFY);
}

public void handleEvents() throws InterruptedException{
while(true){
WatchKey key = watch.take();
for(WatchEvent event : key.pollEvents()){
WatchEvent.Kind kind = event.kind();

if(kind == OVERFLOW){//事件可能lost or discarded
continue;
}

WatchEvent e = (WatchEvent)event;
Path fileName = (Path) e.context();

System.out.printf("Event %s has happened,which fileName is %s%n"
,kind.name(),fileName);

}

//如果事件invail

if(!key.reset()){
break;
}
}
}

public static void main(String[] args) {
try {
new Test(Paths.get("F://")).handleEvents();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}