Java Basics-Day 21st

IO stream:

FileOutputStream

FileInputStream

Byte stream Copy File

Binary stream with byte stream input and output

public void NewLine (): Write line delimiter based on system platform

Public String ReadLine (): reads one row of data at a time

Code manipulation "Exercise"

1  Packagecn.itcast01;2 3 ImportJava.io.BufferedReader;4 ImportJava.io.BufferedWriter;5 ImportJava.io.File;6 ImportJava.io.FileReader;7 ImportJava.io.FileWriter;8 ImportJava.io.FilenameFilter;9 Importjava.io.IOException;Ten  One  A /* - * Requirements: Copy the specified type file to the specified directory in the specified directory -  *  the * Ideas: - * A: Package source directory - * B: Traverse the source directory for each file that matches the specified type - * C: Rename copy: + * A: Rename first, copy later; - * B: Unified renaming after copy +  *  A * Promotion: Replication in multi-level directory at  */ -  Public classFileCopyDemo2 { -      Public Static voidMain (string[] args)throwsIOException { -         //A: Package source directory -File File =NewFile ("D:\\java\\javacode\\day1"); -          in         //B: Traverse the source directory for each file that matches the specified type -file[] files = file.listfiles (NewFilenameFilter () { to @Override +              Public BooleanAccept (File dir, String name) { -                 return NewFile (Dir,name). Isfile () && name.endswith (". Java"); the             }     *         }); $         Panax Notoginseng         //Create a directory -File DestFile =NewFile ("D:\\jad"); the         if(!destfile.exists ()) { +             BooleanFlag =Destfile.mkdir (); ASYSTEM.OUT.PRINTLN ("Create directory when no target directory:" +flag); the         } +          -         //C: Renaming replication: Unified naming after Replication $          for(File filetemp:files) { $String name = Filetemp.getname ();//gets the original specified file name -String newName = Name.replace (". Java", ". Jad");//need to create target directory -File NewFile =NewFile (Destfile,newname);//Create target directory the             //Copy Content -BufferedReader br =NewBufferedReader (NewFileReader (filetemp));WuyiBufferedWriter BW =NewBufferedWriter (NewFileWriter (NewFile)); the              -             Char[] CHS =New Char[1024]; Wu             intLen = 0; -              while(len = Br.read (CHS))!=-1){ AboutBw.write (chs,0, Len); $ Bw.flush (); -             } -         //Close Resource - bw.close (); A br.close (); +         } the     } -}

1  Packagecn.itcast03;2 3 ImportJava.io.BufferedReader;4 ImportJava.io.BufferedWriter;5 ImportJava.io.File;6 ImportJava.io.FileReader;7 ImportJava.io.FileWriter;8 Importjava.io.IOException;9 Ten /** One * Traversal replication of the specified directory A  * @authorItcast -  * -  */ the  Public classFilecopydemo { -      Public Static voidMain (string[] args)throwsIOException { -         //encapsulates a file object -File Srcfile =NewFile ("D:\\java\\javacode\\day2"); +File DestFile =NewFile ("D:\\test"); -         if(!destfile.exists ()) { + destfile.mkdirs (); A         } at         //gets an array of file objects under the specified directory -file[] Arrayfiles =srcfile.listfiles (); -         //Traverse, and make judgments -         Char[] CHS =New Char[1024]; -         intLen = 0; -          for(File arrayfile:arrayfiles) { in             if(Arrayfile.isfile ()) { -String name = Arrayfile.getname ();//gets the original specified file name toFile Finalfile =NewFile (destfile, name);//Create target directory +                 //Create a replication input and output stream -BufferedReader br =NewBufferedReader (NewFileReader (Arrayfile)); theBufferedWriter BW =NewBufferedWriter (NewFileWriter (Finalfile)); *                  $                  while(len = Br.read (CHS))!=-1){Panax NotoginsengBw.write (chs,0, Len); - Bw.flush (); the                 } +                  A                 //Close Resource the bw.close (); + br.close (); -             } $         } $     } -}

Java Basics-Day 21st