Java Fundamentals Enhanced IO flow Note 44:io 4 ways to copy pictures from a stream exercise case

1.4 ways to copy a picture case:

Analysis:

Copy the data, if we know to open with Notepad and can read, use a character stream, otherwise with the word stream.

By this principle, we know that we should adopt a byte stream.

There are 4 ways to do this, so we have 4 ways of doing this. Recommended to master the 4th kind.

Data Source :

C:\\a.jpg--FileInputStream--Bufferedinputstream

Destination :

D:\\b.jpg--FileOutputStream--Bufferedoutputstream

2. 4 ways code Examples:

1  Packagecn.itcast_01;2 3 ImportJava.io.BufferedInputStream;4 ImportJava.io.BufferedOutputStream;5 ImportJava.io.File;6 ImportJava.io.FileInputStream;7 ImportJava.io.FileOutputStream;8 Importjava.io.IOException;9 Ten /* One * Copy Pictures A  *  - * Analysis: - * Copy data, if we know to open with Notepad and can read, use a character stream, otherwise with the word stream.  the * Through this principle, we know that we should adopt a byte stream.  - * And there are 4 ways of byte stream, so we have 4 ways to do this topic. recommended to master the 4th kind .  -  *  - * Data source : + * c:\\a.jpg --fileinputstream--Bufferedinputstream - * destination : + * d:\\b.jpg --fileoutputstream--Bufferedoutputstream A  */ at  Public classCopyimagedemo { -      Public Static voidMain (string[] args)throwsIOException { -         //using a string as a path -         //String srcstring = "c:\\a.jpg"; -         //String deststring = "d:\\b.jpg"; -         //using the file object as a parameter inFile Srcfile =NewFile ("C:\\a.jpg"); -File DestFile =NewFile ("D:\\b.jpg"); to  +         //method1 (Srcfile, destfile); -         //method2 (Srcfile, destfile); the         //method3 (Srcfile, destfile); * method4 (Srcfile, destfile); $     }Panax Notoginseng  -     // byte buffer stream reads and writes one byte array at a time the     Private Static voidMETHOD4 (file srcfile, file destfile)throwsIOException { +Bufferedinputstream bis =NewBufferedinputstream (NewFileInputStream ( A srcfile)); theBufferedoutputstream BOS =NewBufferedoutputstream ( +                 NewFileOutputStream (DestFile)); -  $         byte[] Bys =New byte[1024]; $         intLen = 0; -          while(len = Bis.read (bys))! =-1) { -Bos.write (bys, 0, Len); the         } - Wuyi bos.close (); the bis.close (); -     } Wu  -     // byte buffer stream reads and writes one byte at a time About     Private Static voidMethod3 (file srcfile, file destfile)throwsIOException { $Bufferedinputstream bis =NewBufferedinputstream (NewFileInputStream ( - srcfile)); -Bufferedoutputstream BOS =NewBufferedoutputstream ( -                 NewFileOutputStream (DestFile)); A  +         intby = 0; the          while(by = Bis.read ())! =-1) { - Bos.write (by); $         } the  the bos.close (); the bis.close (); the     } -  in     // Basic byte stream reads and writes one byte array at a time the     Private Static voidMETHOD2 (file srcfile, file destfile)throwsIOException { theFileInputStream FIS =NewFileInputStream (srcfile); AboutFileOutputStream fos =NewFileOutputStream (destfile); the  the         byte[] Bys =New byte[1024]; the         intLen = 0; +          while(len = Fis.read (bys))! =-1) { -Fos.write (bys, 0, Len); the         }Bayi  the fos.close (); the fis.close (); -     } -  the     // Basic byte stream reads and writes one byte at a time the     Private Static voidMethod1 (file srcfile, file destfile)throwsIOException { theFileInputStream FIS =NewFileInputStream (srcfile); theFileOutputStream fos =NewFileOutputStream (destfile); -  the         intby = 0; the          while(by = Fis.read ())! =-1) { the Fos.write (by);94         } the  the fos.close (); the fis.close ();98     } About}

Java Fundamentals Enhanced IO flow Note 44:io 4 ways to copy pictures from a stream exercise case