Klasa Java.io.FilterOutputStream w Javie
Klasa java.io.FilterInputStream w Javie
Java.io.FilterOutputStream class jest nadklasą wszystkich klas, które filtrują strumienie wyjściowe. Metoda write() klasy FilterOutputStream filtruje dane i zapisuje je w bazowym filtrowaniu strumienia, co odbywa się w zależności od strumieni.
Deklaracja:
public class FilterOutputStream extends OutputStream
Konstruktorzy:
Metody:
Składnia:
public void write(int arg) Parameters : arg : Source Bytes Return : void Exception : In case any I/O error occurs.
// Java program illustrating the working of work(int arg) // method import java.io.* ; import java.lang.* ; public class NewClass { public static void main ( String [] args ) throws IOException { // OutputStream FileInputStream & FilterOutputStream // initially null OutputStream geek_out = null ; FilterOutputStream geek_filter = null ; // FileInputStream used here FileInputStream geekinput = null ; char c ; int a ; try { // create output streams geek_out = new FileOutputStream ( 'GEEKS.txt' ); geek_filter = new FilterOutputStream ( geek_out ); // write(int arg) : Used to write 'M' in the file // - 'ABC.txt' geek_filter . write ( 77 ); // Flushes the Output Stream geek_filter . flush (); // Creating Input Stream geekinput = new FileInputStream ( 'GEEKS.txt' ); // read() method of FileInputStream : // reading the bytes and converting next bytes to int a = geekinput . read (); /* Since read() converts bytes to int so we convert int to char for our program output*/ c = ( char ) a ; // print character System . out . println ( 'Character written by' + ' FilterOutputStream : ' + c ); } catch ( IOException except ) { // if any I/O error occurs System . out . print ( 'Write Not working properly' ); } finally { // releases any system resources associated with // the stream if ( geek_out != null ) geek_out . close (); if ( geek_filter != null ) geek_filter . close (); } } }
W programie, z którego korzystałem GEEKS.txt file program utworzy nowy plik o nazwie podanej w kodzie i zapisze w nim.
Wyjście :
Character written by FilterOutputStream : M
Składnia:
public void write(byte[] arg) Parameters : buffer : Source Buffer to be written to the Output Stream Return : void Exception : In case any I/O error occurs.
// Java program illustrating the working of work(byte // buffer) method import java.io.* ; import java.lang.* ; public class NewClass { public static void main ( String [] args ) throws IOException { // OutputStream FileInputStream & FilterOutputStream // initially null OutputStream geek_out = null ; FilterOutputStream geek_filter = null ; // FileInputStream used here FileInputStream geekinput = null ; byte [] buffer = { 77 79 72 73 84 }; char c ; int a ; try { // create output streams geek_out = new FileOutputStream ( 'ABC.txt' ); geek_filter = new FilterOutputStream ( geek_out ); // writes buffer to the output stream geek_filter . write ( buffer ); // forces byte contents to written out to the stream geek_filter . flush (); // create input streams geekinput = new FileInputStream ( 'ABC.txt' ); while (( a = geekinput . read ()) !=- 1 ) { // converts integer to the character c = ( char ) a ; // prints System . out . print ( c ); } } catch ( IOException except ) { // if any I/O error occurs System . out . print ( 'Write Not working properly' ); } finally { // releases any system resources associated // with the stream if ( geek_out != null ) geek_out . close (); if ( geek_filter != null ) geek_filter . close (); } } }
W programie z którego korzystam GEEKS.txt file program utworzy nowy plik o nazwie podanej w kodzie i zapisze w nim.
Wyjście :
MOHIT
Składnia:
public void write(write(byte[] buffer int offset int maxlen) Parameters : buffer : Source Buffer to be written to the Output Stream Return : buffer : Source Buffer to be written offset : Starting offset maxlen : max no. of bytes to be written to the Output Stream Exception : In case any I/O error occurs.
Składnia:
public void flush() Parameters : ------ Return : void Exception : In case any I/O error occurs.
Składnia:
public void close() Parameters : ------ Return : void Exception : In case any I/O error occurs.
Program Java ilustrujący: metody write(bajt[] bufor int przesunięcie int maxlen) Flush() Close()
// Java program illustrating the working of // write(byte[] buffer int offset int maxlen) // flush() close() method import java.io.* ; import java.lang.* ; public class NewClass { public static void main ( String [] args ) throws IOException { // OutputStream FileInputStream & FilterOutputStream // initially null OutputStream geek_out = null ; FilterOutputStream geek_filter = null ; // FileInputStream used here FileInputStream geekinput = null ; byte [] buffer = { 65 66 77 79 72 73 84 }; char c ; int a ; try { // create output streams geek_out = new FileOutputStream ( 'ABC.txt' ); geek_filter = new FilterOutputStream ( geek_out ); // write(byte[] buffer int offset int maxlen) : // writes buffer to the output stream // Here offset = 2 so it won't read first two bytes // then maxlen = 5 so it will print max of 5 characters geek_filter . write ( buffer 2 5 ); // forces byte contents to written out to the stream geek_filter . flush (); // create input streams geekinput = new FileInputStream ( 'ABC.txt' ); while (( a = geekinput . read ()) !=- 1 ) { // converts integer to the character c = ( char ) a ; // prints System . out . print ( c ); } } catch ( IOException except ) { // if any I/O error occurs System . out . print ( 'Write Not working properly' ); } finally { // releases any system resources associated // with the stream if ( geek_out != null ) geek_out . close (); if ( geek_filter != null ) geek_filter . close (); } } }
Notatka :
W programie z którego korzystam GEEKS.txt file program utworzy nowy plik o nazwie podanej w kodzie i zapisze w nim.
Wyjście :
MOHIT
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