Java File类常用方法与文件过滤器详解

package JS;

  import java.io.File;

  public class XX {

      public static void main(String[] args) {

          File file= new File( "example.txt" );

          //获取文件名称

          System.out.println( "文件名称:" +file.getName());

          //获取文件的相对路径

          System.out.println( "文件的相对路径:" +file.getPath());

          //获取文件的绝对路径

          System.out.println( "文件的绝对路径:" +file.getAbsolutePath());

          //获取文件的父路径

          System.out.println( "文件的父路径:" +file.getParent());

          //判断文件是否可读

          System.out.println(file.canRead() ? "文件可读" : "文件不可读" );

          //判断文件是否可写

          System.out.println(file.canWrite() ? "文件可写" : "文件不可写" );

          //判断是否是同一个文件

          System.out.println(file.isFile() ? "是一个文件" : "不是一个文件" );

          //判断是否是同一个目录

          System.out.println(file.isDirectory() ? "文件是一个目录" : "文件不是一个目录" );

         //得到文件最后的修改时间

          System.out.println( "最后修改时间为:" +file.lastModified());

          //得到文件的大小

          System.out.println( "文件的大小为:" +file.length()+ "bytes" );

          //是否成功删除文件

          System.out.println( "是否成功删除文件" +file.delete())；

      }

  }

package JhiShi;

import java.io.File;

public class Example01 {

     public static void main(String[] args) throws Exception{

         File file= new File( "C:\\Users\\lenovo\\IdeaProjects\\java se" );

         if (file.isDirectory()){

             String[] names=file.list();

             for (String name:names){

                 System.out.println(name);

             }

         }

     }

}

package JhiShi;

import java.io.File;

import java.io.FilenameFilter;

public class Example02 {

     public static void main(String[] args) throws Exception{

         File file= new File( "C:\\Users\\lenovo\\IdeaProjects\\java se" );

         FilenameFilter filter= new FilenameFilter() {

             @Override

             public boolean accept(File dir, String name) {

                 File currFile= new File(dir,name);

                 if (currFile.isFile()&&name.endsWith( ".txt" )){

                     return true ;

                 } else {

                     return false ;

                 }

             }

         };

         if (file.exists()){

             String[] lists=file.list(filter);

             for (String name:lists){

                 System.out.println(name);

             }

         }

     }

package JhiShi;

import java.io.File;

public class Example03 {

     public static void main(String[] args) throws Exception{

         File file= new File( "C:\\Users\\lenovo\\IdeaProjects\\java se" );

         fileDir(file);

     }

     public static void fileDir(String[] args) {

         File[]files=dir.listFiles();

         for (File file:files){

             if (file.isDirectory()){

                 fileDir(file);

             }

             System.out.println(file.getAbsoluteFile());

         }

     }

}

package JhiShi;

import java.io.File;

public class Example03 {

     public static void main(String[] args) {

         File file= new File( "C:\\ABC" );

         deleteDir(file); 

     }

     public static void deleteDir(String[] args) {

         if (dir.exists){

             File[]files=dir.listFiles();

             for (File file:files){

                 if (files.isDirectory()){

                     deleteDir(file);

                 } else {

                     file.delete();

                 }

             }

             dir.delete();

         }

     }

}