javase02-unit07: Basic IO operation, text data io operation

Basic IO operations, text data IO operationsJava standard IO (input/output) operations

 Packageday07;ImportJava.io.FileOutputStream;Importjava.io.IOException;/*** java standard IO (input/output) operation * Input stream Inputstrean: used to read data from the data source into the program * output stream OutputStream: used to send data to the target * stream divided into: node flow, processing Flow * Node Flow: Also known as low-level Flow, Characteristics: Data source Clear, true negative * responsibility "handling" data stream reading and writing is based on the node stream * Processing flow: Also called Advanced streaming, features: Can not exist independently (meaningless), * to handle other streams, to simplify the read and write operation * file stream * File flow is low Stream, because the data source is clear, is read and write file * * File output stream: Java.io.FileOutputStream * for writing data to a file * *@authorAdminitartor **/ Public classFileoutputstream_write { Public Static voidMain (string[] args)throwsIOException {/** There are two common patterns for file streams: * Overwrite write operations when the constructor method passes only one parameter: * FileOutputStream (String path) * Fileoutputstre         AM (File file) * If the file already exists, all data in the file will be purged first. * * Append write operation: * FileOutputStream (String path,boolean Append) * FileOutputStream (File File,boolean AP         Pend) * If the second argument is true, the content written out through the current stream will be appended to the end of the file. */FileOutputStream Fos=NewFileOutputStream ("Fos.txt",true            ); String Str= "I do not turn a blind eye to the match you play!"; Fos.write (Str.getbytes ("UTF-8")); System.out.println ("Write it Out!");    Fos.close (); }}

Fileoutputstream_write.javaFile input stream, a stream that reads bytes from a file, is a low-level stream

 Packageday07;ImportJava.io.FileInputStream;Importjava.io.FileNotFoundException;Importjava.io.IOException;/*** java.io.FileInputStream * File input stream * used to read bytes from a file stream, is a low-level stream * *@authorAdminitartor **/ Public classFileinputstream_read { Public Static voidMain (string[] args)throwsIOException {fileinputstream fis=NewFileInputStream ("Fos.txt"); byte[] data =New byte[200]; intLen =fis.read (data); String Str=NewString (Data,0,len, "UTF-8");                    System.out.println (str);            Fis.close (); }}

Fileinputstream_read.javaCopying files using a file stream

 Packageday07;ImportJava.io.FileInputStream;ImportJava.io.FileOutputStream;Importjava.io.IOException;/*** Copy files using a file stream *@authorAdminitartor **/ Public classcopydemo1{ Public Static voidMain (string[] args)throwsIOException {fileinputstream fis=NewFileInputStream ("Music.mp3"); FileOutputStream Fos=NewFileOutputStream ("Music_cp2.mp3"); byte[] buf =New byte[1024*10]; intLen =-1;  while(len = Fis.read (buf))!=-1) {fos.write (buf,0, Len); } System.out.println ("Copy complete!");        Fis.close ();    Fos.close (); }}

Copydemo1.javaBuffered stream buffer streams are a pair of premium streams that can be used to improve read and write efficiency Java.io.BufferedOutputStream buffered byte output stream for improved writing efficiency

 Packageday07;ImportJava.io.BufferedInputStream;ImportJava.io.BufferedOutputStream;ImportJava.io.FileInputStream;ImportJava.io.FileOutputStream;Importjava.io.IOException;/*** Buffered Stream Buffer stream is a pair of advanced streams that use them to improve read and write efficiency Java.io.BufferedOutputStream buffered byte output stream for increased write efficiency * * Java.io.BufferedInputStream buffered byte input stream For improved read efficiency * *@authorAdminitartor **/ Public classCopyDemo2 { Public Static voidMain (string[] args)throwsIOException {fileinputstream fis=NewFileInputStream ("Mv.mp4"); Bufferedinputstream bis=NewBufferedinputstream (FIS); FileOutputStream Fos=NewFileOutputStream ("Mv_cp.mp4"); Bufferedoutputstream Bos=NewBufferedoutputstream (FOS); intD =-1; LongStart =System.currenttimemillis ();  while((d = bis.read ())! =-1) {bos.write (d); }        LongEnd =System.currenttimemillis (); System.out.println ("Copy finished!" Time: "+ (End-start) +" MS ");        Bis.close ();    Bos.close (); }}

Copydemo2.javaBuffer Stream writes out data buffers problem

 Packageday07;ImportJava.io.BufferedOutputStream;ImportJava.io.FileOutputStream;Importjava.io.IOException;/*** Buffer Stream writes out data buffers problem *@authorAdminitartor **/ Public classBos_write { Public Static voidMain (string[] args)throwsIOException {fileoutputstream fos=NewFileOutputStream ("Bos.txt"); Bufferedoutputstream Bos=NewBufferedoutputstream (FOS); String Str= "I have a pen,i has a apple";        Bos.write (Str.getbytes ()); /** void Flush () * This method can force the data in the buffer in the current buffer stream to be written out. */Bos.flush (); System.out.println ("Write it Out!");    Bos.close (); }}

Bos_write.java

javase02-unit07: Basic IO operation, text data io operation