本文实例为大家分享了文件过滤类FileFilter和FilenameFilter，供大家参考，具体内容如下
1.FileFilter
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package test;import java.io.File;import java.io.FileFilter;public class FileFilterTest implements FileFilter { private String extension; public FileFilterTest(String extension) { this.extension = extension; } /** * */ @Override public boolean accept(File pathname) { if(pathname.isDirectory()){ return false; } String name = pathname.getName(); int num = name.lastIndexOf("."); if(num == -1){ return false; } if(name.length()-1 == num){ return false; } else { return extension.equals(name.substring(num+1)); } } public static void main(String[] args) { File path = new File("E:\\书籍\\java 编程"); //获得过滤对象 FileFilterTest ft = new FileFilterTest("pdf"); File[] files = path.listFiles(ft); for (int i = 0; i < files.length; i++) { System.out.println(files[i].getAbsolutePath()); } }} |
2.FilenameFilter
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package test;import java.io.File;import java.io.FilenameFilter;public class FileNameFilterTest implements FilenameFilter { //判断图片是否格式是否是 gif private boolean isGif(String fileName){ if(fileName.toLowerCase().endsWith(".gif")){ return true; } else { return false; } } //判断图片是否格式是否是 jpg private boolean isJpg(String fileName){ if(fileName.toLowerCase().endsWith(".jpg")){ return true; } else { return false; } } //判断图片是否格式是否是 png private boolean isPng(String fileName){ if(fileName.toLowerCase().endsWith(".png")){ return true; } else { return false; } } @Override public boolean accept(File dir, String name) { return (isGif(name)||isJpg(name)||isPng(name)); } public static void main(String[] args) { File path = new File("C:\\img"); //获得过滤对象 FileNameFilterTest ft = new FileNameFilterTest(); File[] f = path.listFiles(ft); for (int i = 0; i < f.length; i++) { File file = f[i]; System.out.println(file.getAbsolutePath()); } }} |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://www.cnblogs.com/wwyx-xi/archive/2017/08/24/7423599.html
