Java replication Specifies the suffix name file and modifies the prefix name

Import Java.io.file;import java.io.fileinputstream;import java.io.fileoutputstream;import java.io.FilenameFilter; Import java.util.arraylist;import java.util.list;/** * Copy all the. java files under the C:\CN directory to the C:\Test directory and change the extension of the original file from. java to. wl.  * @author WL * @time 2014.10.05 02:10:23 * */public class Copyfilesfromatob {public static void main (string[] args) throws Exception {myfilter myfilter=new myfilter (); File F1=new file ("C:\\cn"); File F2=new ("C:\\test"); Copyfilesandrename (f1,f2,myfilter);//Copy the files ending in. java under F1 directory to directory F2 and modify their extension}public static void Copyfilesandrename (File f1,file f2,filenamefilter myfilter) throws exception{list<file> list=new ArrayList <File> (), if (!f1.exists () &&f1.isdirectory ()) {throw new RuntimeException ("directory does not Exist");} if (!f2.exists () &&f2.isdirectory ()) {f2.mkdir ();//If F2 does not exist create a new}file[] files=f1.listfiles ();/ List all files under F1 list=recarsive (files,myfilter,list);//traverse all files under file and add the files ending in. java to the list; FileInputStream fis; FileOutputStream Fos; String filename;//iterates through the file in the list,Copy to F2, and modify the extension for (File file:list) {filename =file.getname (). replace (". Java", ". WL"); File Newfile=new file (f2,filename); fis=new FileInputStream (File); fos=new FileOutputStream (NewFile); FileCopy (FIS, FOS); Fis.close (); Fos.close ();}} Copy file contents private static void FileCopy (FileInputStream fis, FileOutputStream fos) throws Exception {int len=0;byte[] Buf=ne W Byte[1024];if ((Len=fis.read (BUF))!=-1) {fos.write (buf, 0, Len);}} Recursively traverse the directory to get the collection of all files ending in. java listpublic static list<file> recarsive (file[] Files,filenamefilter myfilter,list <File> list) {for (File file:files) {if (File.isdirectory ()) {recarsive (File.listfiles (), myfilter,list);} else if (myfilter.accept (file, File.getname ())) {List.add (file);}} System.out.println ("List.size ()" +list.size ()); return list;}} File filter class, filter all files ending in. Java class Myfilter implements filenamefilter{@Overridepublic Boolean accept (file dir, String name) {return Name.endswith (". Java");}}

Java replication Specifies the suffix name file and modifies the prefix name