Java中的目录侦听器 [英] Directory listener in Java

问题描述

我有一个应用程序，我想听取对特定目录所做的任何更改。应用程序应该在该目录中添加，删除或更新任何文件后立即ping我。

解决方案

可以使用< a href =http://jnotify.sourceforge.net/ =noreferrer> JNotify

JNotify是一个允许java应用程序监听文件
系统事件的java库，如：文件创建
文件修改文件重命名文件
已删除支持平台

$ b $ Windows（2000或更新版本）Windows注释
具有INofity支持的Linux（2.6.14或
更新）Linux说明Mac OS X（10.5或
较新）Mac OS笔记

更多信息

从JNotify从< a href =http://sourceforge.net/projects/jnotify/files/jnotify/jnotify-0.93/jnotify-lib-0.93.zip/download =noreferrer> here

根据平台在lib路径中提取zip，放入.dll / .so。并在类路径中创建一个类，提供 jnotify-0.93.jar 。

示例代码：

  package org.life.java.stackoverflow .questions; 
 
 import net.contentobjects.jnotify.JNotify; 
 import net.contentobjects.jnotify.JNotifyListener; 
 
 / ** 
 * 
 * @author Jigar 
 * / 
 public class JNotifyDemo {
 
 public void sample ）throws Exception {
 // path to watch 
 String path = System.getProperty（user.home）; 
 
 //监视掩码，指定关心的事件，
 //或JNotify.FILE_ANY用于所有事件。 
 int mask = JNotify.FILE_CREATED 
 | JNotify.FILE_DELETED 
 | JNotify.FILE_MODIFIED 
 | JNotify.FILE_RENAMED; 
 
 //手表子树？ 
 boolean watchSubtree = true; 
 
 //添加实际的手表
 int watchID = JNotify.addWatch（path，mask，watchSubtree，new Listener（））; 
 
 //睡一会儿，如果
 //不要（看异步），应用程序将退出，取决于您的
 //应用程序，这可能不是必需
 Thread.sleep（1000000）; 
 
 //删除手表
 boolean res = JNotify.removeWatch（watchID）; 
 if（！res）{
 //指定无效的手表ID。 
} 
} 
 
类Listener实现JNotifyListener {
 
 public void fileRenamed（int wd，String rootPath，String oldName，
 String newName ）{
 print（renamed+ rootPath +：+ oldName + - >+ newName）; 
} 
 
 public void fileModified（int wd，String rootPath，String name）{
 print（modified+ rootPath +：+ name）; 
} 
 
 public void fileDeleted（int wd，String rootPath，String name）{
 print（deleted+ rootPath +：+ name）; 
} 
 
 public void fileCreated（int wd，String rootPath，String name）{
 print（created+ rootPath +：+ name）; 
} 
 
 void print（String msg）{
 System.err.println（msg）; 
} 
} 
 public static void main（String [] args）throws Exception {
 new JNotifyDemo（）。 
} 
} 
  

输出： p>

 修改C：\Documents and Settings\jigar：LOCALS〜1\Temp\etilqs_4s8ywsvyukghK0uDxRop 
 modified C： \Documents and Settings\jigar：LOCALS〜1\Temp\etilqs_4s8ywsvyukghK0uDxRop 
已修改C：\Documents和Settings\jigar：LOCALS〜1\Temp\output1295531079119 
已修改C： \Documents and Settings\jigar：Local Settings\Application Data\Google\Chrome\User Data\Default 
 deleted C：\Documents and Settings\jigar：Local Settings\Application Data \Google\Chrome\User Data\Default\Cache\f_001ea9 
创建C：\Documents和Settings\jigar：Local Settings\Application Data\Google\Chrome\User Data\Default\Cache\f_001eae 
修改C：\Documents和Settings\jigar：LOCALS〜1\Temp\etilqs_04 gchL79ZJrpClZIqiom 
修改C：\Documents和Settings\jigar：LOCALS〜1\Temp\etilqs_04gchL79ZJrpClZIqiom 
修改C：\Documents和Settings\jigar：本地设置\\应用数据\\ Google\Chrome\User Data\Default\Cache 
已修改C：\Documents和Settings\jigar：Local Settings\Application Data\Google\Chrome\User Data\Default\\ \\ Cache\f_001eae 
已修改C：\Documents和Settings\jigar：本地设置\应用数据\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\修改C：\Documents和Settings\jigar：LOCALS〜1\Temp\output1295531079119 
修改C：\Documents和Settings\jigar：本地设置\应用数据\\\Chrome\\ \\用户数据\Default\Current会话
删除C：\Documents和Settings\jigar：本地设置\\应用数据\\ Google\Chrome\User Data\Default\Cache\f_001ea8 
创建C：\Documents和Settings\jigar：Local Settings\Application Data\Google\Chrome\User Data\\ \\ Default\Cache\f_001eaf 
已修改C：\Documents和Settings\jigar：本地设置\应用程序Data\Google\Chrome\User Data\Default\Cache 
修改C：\Documents和Settings\jigar：LOCALS〜1\Temp\etilqs_04gchL79ZJrpClZIqiom 
修改C：\Documents和Settings\jigar：LOCALS〜1\Temp\etilqs_04gchL79ZJrpClZIqiom 
修改C：\Documents和Settings\jigar：本地设置\应用程序Data\Google\Chrome\User Data\Default\Cache\f_001eaf 
修改C：\Documents和Settings\\ \\ jigar：本地设置\应用数据\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
I have an application in which I want to listen to any changes made to a particular directory.  The application should ping me as soon as there are any files added, deleted or updated in that directory.
解决方案
You can use JNotify

  
JNotify is a java library that allow java application to listen to file
  system events, such as: File created
  File modified File renamed File
  deleted Supported platforms
  
  
Windows (2000 or newer) Windows notes
  Linux with INofity support (2.6.14 or
  newer) Linux notes Mac OS X (10.5 or
  newer) Mac OS notes
More Info :

Download JNotify from here  

Extract the zip, put .dll/.so according to platform in your lib path. and create a class provide jnotify-0.93.jar in class path.  

Sample code:
package org.life.java.stackoverflow.questions;

import net.contentobjects.jnotify.JNotify;
import net.contentobjects.jnotify.JNotifyListener;

/**
 *
 * @author Jigar
 */
public class JNotifyDemo {

    public void sample() throws Exception {
        // path to watch
        String path = System.getProperty("user.home");

        // watch mask, specify events you care about,
        // or JNotify.FILE_ANY for all events.
        int mask = JNotify.FILE_CREATED
                | JNotify.FILE_DELETED
                | JNotify.FILE_MODIFIED
                | JNotify.FILE_RENAMED;

        // watch subtree?
        boolean watchSubtree = true;

        // add actual watch
        int watchID = JNotify.addWatch(path, mask, watchSubtree, new Listener());

        // sleep a little, the application will exit if you
        // don't (watching is asynchronous), depending on your
        // application, this may not be required
        Thread.sleep(1000000);

        // to remove watch the watch
        boolean res = JNotify.removeWatch(watchID);
        if (!res) {
            // invalid watch ID specified.
        }
    }

    class Listener implements JNotifyListener {

        public void fileRenamed(int wd, String rootPath, String oldName,
                String newName) {
            print("renamed " + rootPath + " : " + oldName + " -> " + newName);
        }

        public void fileModified(int wd, String rootPath, String name) {
            print("modified " + rootPath + " : " + name);
        }

        public void fileDeleted(int wd, String rootPath, String name) {
            print("deleted " + rootPath + " : " + name);
        }

        public void fileCreated(int wd, String rootPath, String name) {
            print("created " + rootPath + " : " + name);
        }

        void print(String msg) {
            System.err.println(msg);
        }
    }
    public static void main(String[] args) throws Exception {
        new JNotifyDemo().sample();
    }
}
Output:
modified C:\Documents and Settings\jigar: LOCALS~1\Temp\etilqs_4s8ywsvyukghK0uDxRop
modified C:\Documents and Settings\jigar : LOCALS~1\Temp\etilqs_4s8ywsvyukghK0uDxRop
modified C:\Documents and Settings\jigar : LOCALS~1\Temp\output1295531079119
modified C:\Documents and Settings\jigar : Local Settings\Application Data\Google\Chrome\User Data\Default
deleted C:\Documents and Settings\jigar : Local Settings\Application Data\Google\Chrome\User Data\Default\Cache\f_001ea9
created C:\Documents and Settings\jigar : Local Settings\Application Data\Google\Chrome\User Data\Default\Cache\f_001eae
modified C:\Documents and Settings\jigar : LOCALS~1\Temp\etilqs_04gchL79ZJrpClZIqiom
modified C:\Documents and Settings\jigar : LOCALS~1\Temp\etilqs_04gchL79ZJrpClZIqiom
modified C:\Documents and Settings\jigar : Local Settings\Application Data\Google\Chrome\User Data\Default\Cache
modified C:\Documents and Settings\jigar : Local Settings\Application Data\Google\Chrome\User Data\Default\Cache\f_001eae
modified C:\Documents and Settings\jigar : Local Settings\Application Data\Google\Chrome\User Data\Default\Cache\f_001eae
modified C:\Documents and Settings\jigar : LOCALS~1\Temp\output1295531079119
modified C:\Documents and Settings\jigar : Local Settings\Application Data\Google\Chrome\User Data\Default\Current Session
deleted C:\Documents and Settings\jigar : Local Settings\Application Data\Google\Chrome\User Data\Default\Cache\f_001ea8
created C:\Documents and Settings\jigar : Local Settings\Application Data\Google\Chrome\User Data\Default\Cache\f_001eaf
modified C:\Documents and Settings\jigar : Local Settings\Application Data\Google\Chrome\User Data\Default\Cache
modified C:\Documents and Settings\jigar : LOCALS~1\Temp\etilqs_04gchL79ZJrpClZIqiom
modified C:\Documents and Settings\jigar : LOCALS~1\Temp\etilqs_04gchL79ZJrpClZIqiom
modified C:\Documents and Settings\jigar : Local Settings\Application Data\Google\Chrome\User Data\Default\Cache\f_001eaf
modified C:\Documents and Settings\jigar : Local Settings\Application Data\Google\Chrome\User Data\Default\Cache\f_001eaf


                        
这篇关于Java中的目录侦听器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！