org.apache.commons.io.filefilter.FileFilterUtils#or ( )源码实例Demo

/**
 * 只监控文件发送变化,如果是子目录的文件改变,则目录会变,由于没有过滤目录发生变化,则目录下的文件改变不会监控到
 * @param dir
 * @throws Exception 
 */
public void check1(String dir) throws Exception
{
	File directory = new File(dir);
    // 轮询间隔 5 秒
    long interval = TimeUnit.SECONDS.toMillis(5);
    // 创建一个文件观察器用于处理文件的格式
    IOFileFilter filter=FileFilterUtils.or(FileFilterUtils.suffixFileFilter(".class"),
    		FileFilterUtils.suffixFileFilter(".jar"));
    FileAlterationObserver observer = new FileAlterationObserver(directory,filter);
    //设置文件变化监听器
    observer.addListener(new MyFileListener());
    FileAlterationMonitor monitor = new FileAlterationMonitor(interval);
    monitor.addObserver(observer);//文件观察
    monitor.start();
}
 

public void check2(String dir) throws Exception
	{
		File directory = new File(dir);
	    // 轮询间隔 5 秒
	    long interval = TimeUnit.SECONDS.toMillis(5);
	    //后缀过滤器
	    IOFileFilter filefilter=FileFilterUtils.or(FileFilterUtils.suffixFileFilter(".class"),
	    		FileFilterUtils.suffixFileFilter(".jar"));
	    //子目录的后缀
	    IOFileFilter subFilefilter=FileFilterUtils.or(FileFilterUtils.directoryFileFilter(),filefilter);
	    //根目录和子目录变化
	    IOFileFilter filter = FileFilterUtils.or(filefilter,subFilefilter);
	    FileAlterationObserver observer = new FileAlterationObserver(directory,filter);
	    //设置文件变化监听器
	    observer.addListener(new MyFileListener());
	    FileAlterationMonitor monitor = new FileAlterationMonitor(interval);
	    monitor.addObserver(observer);//文件观察
	    monitor.start();
//	    monitor.addObserver(observer);//文件观察,如果在start后面加,则会触发所有文件创建
	}
 

protected IOFileFilter buildFilterBySuffixs(String directory,String ...suffixs)
{
    IOFileFilter iOFileFilter=FileFilterUtils.directoryFileFilter(); //子目录变化
	for(String suffix:suffixs)
	{//后缀过滤器
		iOFileFilter=FileFilterUtils.or(iOFileFilter,FileFilterUtils.suffixFileFilter(suffix));
	}
    return iOFileFilter;
}
 

protected IOFileFilter buildFilterByNames(String directory,String ...fileName)
{
    IOFileFilter iOFileFilter=FileFilterUtils.directoryFileFilter(); //子目录变化
	for(String name:fileName)
	{//名字过滤器
		iOFileFilter=FileFilterUtils.or(iOFileFilter,FileFilterUtils.nameFileFilter(name));
	}
    return iOFileFilter;
}
 

protected FileAlterationObserver buildFileAlterationObserver(String directory)
{
    //后缀过滤器
    IOFileFilter suffixFileFilter=FileFilterUtils.or(FileFilterUtils.suffixFileFilter(".class"),FileFilterUtils.suffixFileFilter(".jar"));
    //子目录变化
    IOFileFilter rootAndSubFilefilter=FileFilterUtils.or(FileFilterUtils.directoryFileFilter(),suffixFileFilter);
    return new FileAlterationObserver(directory,rootAndSubFilefilter);
}
 

/**
 * Constructor.
 * @param manager the templating manager, to which event handling is delegated.
 * @param templateDir the templates directory to watch.
 * @param pollInterval the poll interval.
 * @throws IOException if there is a problem watching the template directory.
 */
public TemplateWatcher( final TemplatingManager manager, final File templateDir, final long pollInterval ) {
	this.templateDir = templateDir;

	// Register the custom helpers.
	this.handlebars.registerHelper( AllHelper.NAME, new AllHelper());
	this.handlebars.registerHelper( IsKeyHelper.NAME, new IsKeyHelper());

	// Pretty formatting
	this.handlebars.prettyPrint( true );

	// Create the observer, register this object as the event listener.
	FileFilter fileFilter = FileFilterUtils.or(
			FileFilterUtils.and(
					FileFilterUtils.fileFileFilter(),
					FileFilterUtils.suffixFileFilter( ".tpl" ),
					CanReadFileFilter.CAN_READ,
					new TemplateFileFilter(templateDir)),
			FileFilterUtils.and(
					FileFilterUtils.directoryFileFilter(),
					CanReadFileFilter.CAN_READ,
					new TemplateSubDirectoryFileFilter(templateDir))
	);

	FileAlterationObserver observer = new FileAlterationObserver( this.templateDir, fileFilter );
	observer.addListener( this );

	// Create the monitor.
	this.monitor = new FileAlterationMonitor( pollInterval, observer );
	this.monitor.setThreadFactory( THREAD_FACTORY );

	this.manager = manager;
	this.logger.fine( "Template watcher is watching "
			+ this.templateDir
			+ " with an interval of " + pollInterval + " ms." );
}
 

/**
 * Construct an instance with a directory and a file filter and an optional
 * limit on the <i>depth</i> navigated to.
 * <p>
 * The filters control which files and directories will be navigated to as part
 * of the walk. This constructor uses {@link FileFilterUtils#makeDirectoryOnly(IOFileFilter)}
 * and {@link FileFilterUtils#makeFileOnly(IOFileFilter)} internally to combine the filters.
 * A {@code null} filter means that no filtering should occur.
 *
 * @param directoryFilter  the filter to apply to directories, null means visit all directories
 * @param fileFilter  the filter to apply to files, null means visit all files
 * @param depthLimit  controls how <i>deep</i> the hierarchy is
 *  navigated to (less than 0 means unlimited)
 */
protected DirectoryWalker(IOFileFilter directoryFilter, IOFileFilter fileFilter, int depthLimit) {
    if (directoryFilter == null && fileFilter == null) {
        this.filter = null;
    } else {
        directoryFilter = directoryFilter != null ? directoryFilter : TrueFileFilter.TRUE;
        fileFilter = fileFilter != null ? fileFilter : TrueFileFilter.TRUE;
        directoryFilter = FileFilterUtils.makeDirectoryOnly(directoryFilter);
        fileFilter = FileFilterUtils.makeFileOnly(fileFilter);
        this.filter = FileFilterUtils.or(directoryFilter, fileFilter);
    }
    this.depthLimit = depthLimit;
}
 

/**
 * Construct an instance with a directory and a file filter and an optional
 * limit on the <i>depth</i> navigated to.
 * <p>
 * The filters control which files and directories will be navigated to as part
 * of the walk. This constructor uses {@link FileFilterUtils#makeDirectoryOnly(IOFileFilter)}
 * and {@link FileFilterUtils#makeFileOnly(IOFileFilter)} internally to combine the filters.
 * A {@code null} filter means that no filtering should occur.
 *
 * @param directoryFilter  the filter to apply to directories, null means visit all directories
 * @param fileFilter  the filter to apply to files, null means visit all files
 * @param depthLimit  controls how <i>deep</i> the hierarchy is
 *  navigated to (less than 0 means unlimited)
 */
protected DirectoryWalker(IOFileFilter directoryFilter, IOFileFilter fileFilter, final int depthLimit) {
    if (directoryFilter == null && fileFilter == null) {
        this.filter = null;
    } else {
        directoryFilter = directoryFilter != null ? directoryFilter : TrueFileFilter.TRUE;
        fileFilter = fileFilter != null ? fileFilter : TrueFileFilter.TRUE;
        directoryFilter = FileFilterUtils.makeDirectoryOnly(directoryFilter);
        fileFilter = FileFilterUtils.makeFileOnly(fileFilter);
        this.filter = FileFilterUtils.or(directoryFilter, fileFilter);
    }
    this.depthLimit = depthLimit;
}
 

/**
 * @param args
 * @throws Exception
 */
public static void main(String[] args) throws Exception {


    // 监控根目录，会递归监控子文件夹变化

    String rootDir = "D:\\download";
    // 轮询间隔 5 秒，通过重新启动 FileAlterationMonitor 实现
    long interval = TimeUnit.SECONDS.toMillis(5);


    // 创建一个文件观察器用于处理文件的格式
    // Create a FileFilter
    IOFileFilter directories = FileFilterUtils.and(FileFilterUtils.directoryFileFilter(), HiddenFileFilter.VISIBLE);
    IOFileFilter files = FileFilterUtils.and(FileFilterUtils.fileFileFilter(), FileFilterUtils.suffixFileFilter(".java"));
    IOFileFilter filter = FileFilterUtils.or(directories, files);

    // Create the File system observer and register File Listeners
    FileAlterationObserver observer = new FileAlterationObserver(rootDir, filter, null);
    observer.addListener(new FileMonitorFileListener()); //设置文件变化监听器

    //创建文件变化监听器
    FileAlterationMonitor monitor = new FileAlterationMonitor(interval, observer);

    // 开始监控
    monitor.start();

}