CLASSE JAVA.IO.FILTEROUTPUTSTREAM EN JAVA

Classe java.io.FilterInputStream en Java

Classe FilterInputStream et FilterOutputStream

Java.io.FilterOutputStream class est la superclasse de toutes ces classes qui filtrent les flux de sortie. La méthode write() de la classe FilterOutputStream filtre les données et les écrit dans le filtrage de flux sous-jacent qui est effectué en fonction des flux.

Déclaration :

public class FilterOutputStream extends OutputStream

Constructeurs :

FilterOutputStream(OutputStream geekout) : Crée un filtre de flux de sortie.

Méthodes :

Syntaxe :

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

Mise en œuvre : 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

Sortir :

Character written by FilterOutputStream : M

'arg.longueur'

Syntaxe :

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.

Mise en œuvre : 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

Sortir :

MOHIT

write(byte[] buffer int offset int maxlen) : java.io.FilterOutputStream.write(byte[] buffer int offset int maxlen) écrit maxlen octets à partir du tampon spécifié en commençant à la position de décalage dans le flux de sortie.

Syntaxe :

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.

Syntaxe :

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

Syntaxe :

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

Programme Java illustrant : les méthodes 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  ();      }      }   }