CLASSE JAVA.IO.FILTEROUTPUTSTREAM A JAVA

Classe FilterInputStream i FilterOutputStream' title=

Java.io.FilterOutputStream class és la superclasse de totes aquelles classes que filtren els fluxos de sortida. El mètode write() de la classe FilterOutputStream filtra les dades i les escriu al filtratge de flux subjacent que es fa en funció dels fluxos.

Declaració:

public class FilterOutputStream extends OutputStream

Constructors:

FilterOutputStream(OutputStream geekout):Crea un filtre de flux de sortida.

Mètodes:

Sintaxi:

public void write(int arg)   Parameters :    arg : Source Bytes   Return :   void   Exception :    In case any I/O error occurs.

Implementació: Java

// 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();  }  } }

GEEKS.txt

Sortida:

Character written by FilterOutputStream : M

'arg.length'

Sintaxi:

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.

Implementació: Java

// 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();  }  } }

GEEKS.txt

Sortida:

MOHIT

write(byte[] buffer int offset int maxlen): java.io.FilterOutputStream.write (byte[] buffer int offset int maxlen)escriu maxlen bytes des del buffer especificat començant a la posició de compensació al flux de sortida.

Sintaxi:

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.

Sintaxi:

public void flush()   Parameters :    ------   Return :   void   Exception :    In case any I/O error occurs.

Sintaxi:

public void close()   Parameters :    ------   Return :   void   Exception :    In case any I/O error occurs.

Programa Java que il·lustra: mètodes write(byte[] buffer int offset int maxlen) flush() close()

Java

// 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();  }  } }

Nota:
En el programa que tinc ús GEEKS.txt fitxer el programa crearà un nou fitxer amb el nom donat al codi i escriurà en ell.

Sortida:

MOHIT

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Classe Java.io.FilterOutputStream a Java