Java Fundamentals Hardening IO Flow Note 22:fileinputstream/fileoutputstream Copy text file case

1. Use byte stream fileinputstream/fileoutputstream to copy a text file case:

Analysis:

(1) data source : Where to come from

A.txt--Read data--FileInputStream

(2) destination : Where to go

B.txt--Write data--FileOutputStream

2. code example:

1  Packagecn.itcast_03;2 3 ImportJava.io.FileInputStream;4 ImportJava.io.FileOutputStream;5 Importjava.io.IOException;6 7 /*8 * Copy text files. 9  * Ten * Data Source: Where to come from One * a.txt--read data--FileInputStream A  *  - * Destination: Where to go - * B.txt--Write data--FileOutputStream the  *  - * Java.io.filenotfoundexception:a.txt (the system cannot find the file specified.) ) -  *  - * This time copy Chinese no problem, why? + * The last time we had a problem was because each time we fetched a byte of data, we converted the byte data to character data and then output it to the console.  - * And this time? Really read the data through IO Stream, write to a text file, you read a byte, I write a byte, you do not do any conversion.  + * It will do the conversion on its own.  A  */ at  Public classCopyfiledemo { -      Public Static voidMain (string[] args)throwsIOException { -         //Encapsulating Data Sources -FileInputStream FIS =NewFileInputStream ("A.txt"); -         //Package Destination -FileOutputStream fos =NewFileOutputStream ("B.txt"); in  -         intby = 0; to          while(by = Fis.read ())! =-1) { + Fos.write (by); -         } the  *         //Freeing resources (anyone can do it first) $ fos.close ();Panax Notoginseng fis.close (); -     } the}

Run the effect as follows:

Java Fundamentals Hardening IO Flow Note 22:fileinputstream/fileoutputstream Copy text file case