Java Basics Enhanced IO flow Note 50:io Stream practice copy multi-level folder cases

1. Copying multi-level folder cases

Requirements: Copying multi-level folders
  data Source: E:\JavaSE\day21\code\demos Destination: E:\   Analysis: A: Encapsulating the data source file
B: Package destination file
C: Determine if the file is a document or a folder          A: is a folder
     Create the folder in the destination directory
gets all files or folders under this file object file object iterate to get each file object back to C B: It's a file.
just copy (Byte stream)   2. code example:

1  Packagecn.itcast_05;2 ImportJava.io.BufferedInputStream;3 ImportJava.io.BufferedOutputStream;4 ImportJava.io.File;5 ImportJava.io.FileInputStream;6 ImportJava.io.FileOutputStream;7 Importjava.io.IOException;8 /*9 * Requirements: Duplicate multi-polar foldersTen  *  One * Data Source: E:\JavaSE\day21\code\demos A * Destination: E:\ -  *  - * Analysis: the * A: Encapsulate data source file - * B: Package destination file - * C: Determine if the file is a folder or a document - * A: is a folder + * Create this folder in the destination directory - * Gets all files or folders under this file object file object + * Iterate to get each file object A * back to C at * B: Yes file - * just copy (Byte stream) -  */ -  Public classCopyfoldersdemo { -      Public Static voidMain (string[] args)throwsIOException { -         //encapsulate Data source file inFile Srcfile =NewFile ("E:\\javase\\day21\\code\\demos"); -         //Package destination File toFile DestFile =NewFile ("e:\\"); +         //the ability to copy folders - CopyFolder (Srcfile, destfile); the     } *     Private Static voidcopyfolder (file srcfile, file destfile) $             throwsIOException {Panax Notoginseng         //determine if the file is a folder or a document -         if(Srcfile.isdirectory ()) { the             //folder +File NewFolder =NewFile (DestFile, Srcfile.getname ()); A Newfolder.mkdir (); the             //gets all files or folders under this file object file object +file[] Filearray =srcfile.listfiles (); -              for(File file:filearray) { $ copyfolder (file, newfolder); $             } -}Else { -             //file theFile NewFile =NewFile (DestFile, Srcfile.getname ()); - copyFile (Srcfile, newFile);Wuyi         } the     } -     Private Static voidCopyFile (file srcfile, file newFile)throwsIOException { WuBufferedinputstream bis =NewBufferedinputstream (NewFileInputStream ( - srcfile)); AboutBufferedoutputstream BOS =NewBufferedoutputstream ( $                 NewFileOutputStream (NewFile)); -         byte[] Bys =New byte[1024]; -         intLen = 0; -          while(len = Bis.read (bys))! =-1) { ABos.write (bys, 0, Len); +         } the bos.close (); - bis.close (); $     } the}

Java Basics Enhanced IO flow Note 50:io Stream practice copy multi-level folder cases