java核心编程之文件过滤类FileFilter和FilenameFilter
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2024-02-25 09:49:28
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
package test;...
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
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
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。