java7 WatchService监听文件

最新推荐文章于 2025-06-04 14:44:14 发布

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最新推荐文章于 2025-06-04 14:44:14 发布

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分类专栏： Java 文章标签： java7 WatchService监听文件

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本文介绍了一个使用Java NIO实现的文件监听器，该监听器能够监控指定目录下的文件创建、修改和删除事件，并通过固定线程池处理这些事件。

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    package com.ssh.config;  
      
    import java.io.IOException;  
    import java.nio.file.FileSystems;  
    import java.nio.file.Path;  
    import java.nio.file.Paths;  
    import java.nio.file.StandardWatchEventKinds;  
    import java.nio.file.WatchEvent;  
    import java.nio.file.WatchKey;  
    import java.nio.file.WatchService;  
    import java.util.List;  
    import java.util.concurrent.ExecutorService;  
    import java.util.concurrent.Executors;  
      
    public class ResourceListener {  
        private static ExecutorService fixedThreadPool = Executors.newFixedThreadPool(5);  
        private WatchService ws;  
        private String listenerPath;  
        private ResourceListener(String path) {  
            try {  
                ws = FileSystems.getDefault().newWatchService();  
                this.listenerPath = path;  
                start();  
            } catch (IOException e) {  
                e.printStackTrace();  
            }  
        }  
      
        private void start() {  
            fixedThreadPool.execute(new Listner(ws,this.listenerPath));  
        }  
      
        public static void addListener(String path) throws IOException {  
            ResourceListener resourceListener = new ResourceListener(path);  
            Path p = Paths.get(path);  
            p.register(resourceListener.ws,StandardWatchEventKinds.ENTRY_MODIFY,  
                StandardWatchEventKinds.ENTRY_DELETE,  
                StandardWatchEventKinds.ENTRY_CREATE);  
        }  
          
      
        public static void main(String[] args) throws IOException {  
            ResourceListener.addListener("E:/aaa");  
        }  
    }  
      
    class Listner implements Runnable {  
        private WatchService service;  
        private String rootPath;  
          
        public Listner(WatchService service,String rootPath) {  
            this.service = service;  
            this.rootPath = rootPath;  
        }  
      
        public void run() {  
            try {  
                while(true){  
                    WatchKey watchKey = service.take();  
                    List<WatchEvent<?>> watchEvents = watchKey.pollEvents();  
                    for(WatchEvent<?> event : watchEvents){  
                        //TODO 根据事件类型采取不同的操作。。。。。。。  
                        System.out.println("["+rootPath+"/"+event.context()+"]文件发生了["+event.kind()+"]事件");    
                    }  
                    watchKey.reset();  
                }  
            } catch (InterruptedException e) {  
                e.printStackTrace();  
            }finally{  
                System.out.println("fdsfsdf");  
                try {  
                    service.close();  
                } catch (IOException e) {  
                    e.printStackTrace();  
                }  
            }  
              
        }  
    }