Razred Java.io.PipedInputStream v Javi

Cevi v IO zagotavljajo povezavo med dvema nitima, ki se hkrati izvajata v JVM. Tako se cevi uporabljajo kot vir ali cilj.  

• PipedInputStream je prav tako povezan s PipedOutputStream. Podatke je torej mogoče zapisati s PipedOutputStream in PipedInputStream. Toda uporaba obeh niti hkrati povzroči zastoj za niti.
• PipedOutputStream pošilja konec cevi. Podatki se zapišejo v PipedOutputStream. Cev naj bi bila prekinjena, če PipedInputStream, ki je bral podatke, ni več.

Izjava:   

public class PipedOutputStream  
 extends OutputStream  

Konstruktor:   

• PipedOutputStream() : ustvari PipedOutputStream, ki ni povezan.
• PipedOutputStream(PipedOutputStream inStream) : ustvari PipedOutputStream, ki ga 
  je povezan s PipedInputStream - 'inStream'.

Metode: 

write() : java.io.PipedOutputStream.write(int byte) zapiše določen bajt v cevni izhodni tok. 

Sintaksa: 

    public void write(int byte)     
  
    Parameters :      
byte : byte to be written  
  
    Return :    void  
    Exception :     
->     IOException :    if in case IO error occurs.

write(byte[] buffer int offset int maxlen) : java.io.PipedOutputStream.write(byte[] buffer int offset int maxlen) zapiše maxlen bajtov podatkov iz medpomnilnika v cevni izhodni tok. Metoda se blokira, če v tok ni zapisan noben bajt. 

Sintaksa: 

    public void write(byte[] buffer int offset int maxlen)     
  
    Parameters :      
buffer : data of the buffer  
offset : starting in the destination array - 'buffer'.  
maxlen : maximum length of array to be read  
  
    Return :    void  
    Exception :     
->     IOException :    if in case IO error occurs.

// Java program illustrating the working of PipedInputStream // write(byte[] buffer int offset int maxlen) import java.io.*; public class NewClass {  public static void main(String[] args) throws IOException  {  PipedInputStream geek_input = new PipedInputStream();  PipedOutputStream geek_output = new PipedOutputStream();  // Use of connect() : connecting geek_input with geek_output  geek_input.connect(geek_output);  byte[] buffer = {'J' 'A' 'V' 'A'};  // Use of write(byte[] buffer int offset int maxlen)  geek_output.write(buffer 0 4);  int a = 5;  System.out.print('Use of write(buffer offset maxlen) : ');  while(a>0)  {  System.out.print(' ' + (char) geek_input.read());  a--;  }  } } 

Izhod: 

Use of write(buffer offset maxlen) : J A V A  

• close() : java.io.PipedOutputStream.close() zapre cevovodni izhodni tok in sprosti dodeljena sredstva. 
  Sintaksa: 

public void close()  
    Parameters :      
--------------  
    Return :       
void  
    Exception :     
->     IOException :    if in case IO error occurs.  

• povezava (destinacija PipedInputStream) : java.io.PipedOutputStream.connect (destinacija PipedInputStream poveže cevovodni izhodni tok z 'ciljnim' cevovodnim vhodnim tokom in v primeru, da so 'cilj' cevi z nekim drugim tokom, se vrže izjema IO 
  Sintaksa: 

public void connect(PipedInputStream destination)  
    Parameters :      
destination : the Piped Input Stream to be connected to  
    Return :       
void  
    Exception :     
->     IOException :    if in case IO error occurs.  

• flush(): java.io.PipedOutputStream.flush() splakne izhodni tok. 
  Sintaksa: 

public void flush()  
    Parameters :      
------------  
    Return :       
void  
    Exception :     
->     IOException :    if in case IO error occurs.  

Koda Java, ki ponazarja delovanje metod razreda PipedOutputStream: 

// Java program illustrating the working of PipedInputStream // write() write(byte[] buffer int offset int maxlen) // close() flush() connect() import java.io.*; public class NewClass {  public static void main(String[] args) throws IOException  {  PipedInputStream geek_input = new PipedInputStream();  PipedOutputStream geek_output = new PipedOutputStream();  try  {  // Use of connect() : connecting geek_input with geek_output  geek_input.connect(geek_output);  // Use of write(int byte) :  geek_output.write(71);  geek_output.write(69);  geek_output.write(69);  geek_output.write(75);  geek_output.write(83);  // Use of flush() method :  geek_output.flush();  System.out.println('Use of flush() method : ');  int i = 5;  while(i > 0)  {  System.out.print(' ' + (char) geek_input.read());  i--;  }  // USe of close() method :  System.out.println('nClosing the Output stream');  geek_output.close();  }  catch (IOException except)  {  except.printStackTrace();  }  } } 

Izhod: 

Use of flush() method :   
 G E E K S  
Closing the Output stream