文件选择器
经常我老婆让我帮她从她的手机导出图片,为了避免下次再打搅我玩游戏,索性动手写了一段程序.以下程序有重复造轮子之嫌(这个需求完全可以使用Apache Commons IO来处理),但自己动手玩一下,也能从中体会良多.
package com.app.common.util.file.selector;import java.io.File;import java.io.FileFilter;import java.util.*;/** * 此过滤器用来过滤大于最后修改时间之后的文件 * @author Administrator * */public class AfterLastUpdateFileFilter implements FileFilter {private Date lastUpdateTime;public AfterLastUpdateFileFilter(Date lastUpdateTime) {this.lastUpdateTime = lastUpdateTime;}@Overridepublic boolean accept(File file) {Date fileDate = new Date(file.lastModified());return fileDate.after(lastUpdateTime);}}package com.app.common.util.file.selector;import java.io.*;import java.util.*;/** * 此过滤器属于组合过滤器,仅当两个过滤器验证通过,才会选中文件 * @author Administrator * */public class CompositeFileFilter implements FileFilter {private List<FileFilter> filters;public CompositeFileFilter(List<FileFilter> filters) {this.filters = filters;}@Overridepublic boolean accept(File file) {for (FileFilter filter : filters) {if (filter.accept(file) == false) {return false;}}return true;}}package com.app.common.util.file.selector;import java.io.File;import java.io.FileFilter;/** * 文件扩展名过滤器 * @author Administrator * */public class FileExtensionFilter implements FileFilter {private String extension;public FileExtensionFilter(String extension) {this.extension = extension;}@Overridepublic boolean accept(File file) {if(file.isDirectory()){return false;}return file.getName().toLowerCase().endsWith(extension.toLowerCase());}}package com.app.common.util.file.selector;import java.io.*;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.*;import org.apache.commons.io.IOUtils;/** * 文件选择测试类 * @author Administrator * */public class FileSelector {public void copyFiles(File inputDir, CompositeFileFilter fileFilter,File outDir) {File[] files = null;InputStream in = null;OutputStream output = null;if (inputDir != null && inputDir.exists() && inputDir.isDirectory()&& inputDir.canRead()) {files = inputDir.listFiles(fileFilter);System.out.println("select files length: " + files.length);for (File file : files) {try {in = new FileInputStream(file);System.out.println("handle: " + file.getName());output = new FileOutputStream(new File(outDir,file.getName()));IOUtils.copy(in, output);} catch (IOException e) {e.printStackTrace();} finally {if (null != output) {try {output.close();} catch (IOException e) {e.printStackTrace();}output = null;}if (null != in) {try {in.close();} catch (IOException e) {e.printStackTrace();}in = null;}}}}}public static void main(String[] args) throws ParseException {File inputDir = new File("f:/pic");File outDir = new File("f:/test/");FileSelector selector = new FileSelector();Date lastUpdateTime = new Date();SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");lastUpdateTime = sdf.parse("2012-10-28 23:59:59");List<FileFilter> filters = new ArrayList<FileFilter>();filters.add(new AfterLastUpdateFileFilter(lastUpdateTime));filters.add(new FileExtensionFilter(".jpg"));CompositeFileFilter compositeFileFilter = new CompositeFileFilter(filters);selector.copyFiles(inputDir, compositeFileFilter, outDir);System.out.println("finished...");}}