java.lang.Object
- java.io.OutputStream
- - jakarta.servlet.ServletOutputStream

All Implemented Interfaces:

Closeable, Flushable, AutoCloseable
```
public abstract class ServletOutputStream
extends OutputStream
```
Provides an output stream for sending binary data to the client. A ServletOutputStream object is normally retrieved via the ServletResponse.getOutputStream() method.
This is an abstract class that the servlet container implements. Subclasses of this class must implement the java.io.OutputStream.write(int) method.

Author:

Various

See Also:

ServletResponse

Constructor Summary

Constructors
Modifier Constructor Description

protected ServletOutputStream()
Does nothing, because this is an abstract class.

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`abstract boolean`	`isReady()`	Returns true if data can be written without blocking else returns false.
`void`	`print(boolean b)`	Writes a `boolean` value to the client, with no carriage return-line feed (CRLF) character at the end.
`void`	`print(char c)`	Writes a character to the client, with no carriage return-line feed (CRLF) at the end.
`void`	`print(double d)`	Writes a `double` value to the client, with no carriage return-line feed (CRLF) at the end.
`void`	`print(float f)`	Writes a `float` value to the client, with no carriage return-line feed (CRLF) at the end.
`void`	`print(int i)`	Writes an int to the client, with no carriage return-line feed (CRLF) at the end.
`void`	`print(long l)`	Writes a `long` value to the client, with no carriage return-line feed (CRLF) at the end.
`void`	`print(String s)`	Writes a `String` to the client, without a carriage return-line feed (CRLF) character at the end.
`void`	`println()`	Writes a carriage return-line feed (CRLF) to the client.
`void`	`println(boolean b)`	Writes a `boolean` value to the client, followed by a carriage return-line feed (CRLF).
`void`	`println(char c)`	Writes a character to the client, followed by a carriage return-line feed (CRLF).
`void`	`println(double d)`	Writes a `double` value to the client, followed by a carriage return-line feed (CRLF).
`void`	`println(float f)`	Writes a `float` value to the client, followed by a carriage return-line feed (CRLF).
`void`	`println(int i)`	Writes an int to the client, followed by a carriage return-line feed (CRLF) character.
`void`	`println(long l)`	Writes a `long` value to the client, followed by a carriage return-line feed (CRLF).
`void`	`println(String s)`	Writes a `String` to the client, followed by a carriage return-line feed (CRLF).
`abstract void`	`setWriteListener(WriteListener writeListener)`	Instructs the `ServletOutputStream` to invoke the provided `WriteListener` when it is possible to write

Methods inherited from class java.io.OutputStream
close, flush, nullOutputStream, write, write, write

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ServletOutputStream
```
protected ServletOutputStream()
```
    Does nothing, because this is an abstract class.
- Method Detail
  - print
```
public void print(String s)
           throws IOException
```
    Writes a String to the client, without a carriage return-line feed (CRLF) character at the end.
    
    Parameters:
    
    s - the String to send to the client
    
    Throws:
    
    IOException - if an input or output exception occurred
  - print
```
public void print(boolean b)
           throws IOException
```
    Writes a boolean value to the client, with no carriage return-line feed (CRLF) character at the end.
    
    Parameters:
    
    b - the boolean value to send to the client
    
    Throws:
    
    IOException - if an input or output exception occurred
  - print
```
public void print(char c)
           throws IOException
```
    Writes a character to the client, with no carriage return-line feed (CRLF) at the end.
    
    Parameters:
    
    c - the character to send to the client
    
    Throws:
    
    IOException - if an input or output exception occurred
  - print
```
public void print(int i)
           throws IOException
```
    Writes an int to the client, with no carriage return-line feed (CRLF) at the end.
    
    Parameters:
    
    i - the int to send to the client
    
    Throws:
    
    IOException - if an input or output exception occurred
  - print
```
public void print(long l)
           throws IOException
```
    Writes a long value to the client, with no carriage return-line feed (CRLF) at the end.
    
    Parameters:
    
    l - the long value to send to the client
    
    Throws:
    
    IOException - if an input or output exception occurred
  - print
```
public void print(float f)
           throws IOException
```
    Writes a float value to the client, with no carriage return-line feed (CRLF) at the end.
    
    Parameters:
    
    f - the float value to send to the client
    
    Throws:
    
    IOException - if an input or output exception occurred
  - print
```
public void print(double d)
           throws IOException
```
    Writes a double value to the client, with no carriage return-line feed (CRLF) at the end.
    
    Parameters:
    
    d - the double value to send to the client
    
    Throws:
    
    IOException - if an input or output exception occurred
  - println
```
public void println()
             throws IOException
```
    Writes a carriage return-line feed (CRLF) to the client.
    
    Throws:
    
    IOException - if an input or output exception occurred
  - println
```
public void println(String s)
             throws IOException
```
    Writes a String to the client, followed by a carriage return-line feed (CRLF).
    
    Parameters:
    
    s - the String to write to the client
    
    Throws:
    
    IOException - if an input or output exception occurred
  - println
```
public void println(boolean b)
             throws IOException
```
    Writes a boolean value to the client, followed by a carriage return-line feed (CRLF).
    
    Parameters:
    
    b - the boolean value to write to the client
    
    Throws:
    
    IOException - if an input or output exception occurred
  - println
```
public void println(char c)
             throws IOException
```
    Writes a character to the client, followed by a carriage return-line feed (CRLF).
    
    Parameters:
    
    c - the character to write to the client
    
    Throws:
    
    IOException - if an input or output exception occurred
  - println
```
public void println(int i)
             throws IOException
```
    Writes an int to the client, followed by a carriage return-line feed (CRLF) character.
    
    Parameters:
    
    i - the int to write to the client
    
    Throws:
    
    IOException - if an input or output exception occurred
  - println
```
public void println(long l)
             throws IOException
```
    Writes a long value to the client, followed by a carriage return-line feed (CRLF).
    
    Parameters:
    
    l - the long value to write to the client
    
    Throws:
    
    IOException - if an input or output exception occurred
  - println
```
public void println(float f)
             throws IOException
```
    Writes a float value to the client, followed by a carriage return-line feed (CRLF).
    
    Parameters:
    
    f - the float value to write to the client
    
    Throws:
    
    IOException - if an input or output exception occurred
  - println
```
public void println(double d)
             throws IOException
```
    Writes a double value to the client, followed by a carriage return-line feed (CRLF).
    
    Parameters:
    
    d - the double value to write to the client
    
    Throws:
    
    IOException - if an input or output exception occurred
  - isReady
```
public abstract boolean isReady()
```
    Returns true if data can be written without blocking else returns false.
    If this method returns false and a WriteListener has been set with setWriteListener(WriteListener), then container will subsequently invoke WriteListener.onWritePossible() once a write operation becomes possible without blocking. Other than the initial call, WriteListener.onWritePossible() will only be called if and only if this method is called and returns false.
    
    Returns:
    
    true if data can be written without blocking, otherwise returns false.
    
    Since:
    
    Servlet 3.1
    
    See Also:
    
    WriteListener
  - setWriteListener
```
public abstract void setWriteListener(WriteListener writeListener)
```
    Instructs the ServletOutputStream to invoke the provided WriteListener when it is possible to write
    Parameters:
    
    writeListener - the WriteListener that should be notified when it's possible to write
    
    Throws:
    
    IllegalStateException - if one of the following conditions is true
    
    the associated request is neither upgraded nor the async started
    setWriteListener is called more than once within the scope of the same request.
    
    NullPointerException - if writeListener is null
    
    Since:
    
    Servlet 3.1

Class ServletOutputStream

Constructor Summary

Method Summary

Methods inherited from class java.io.OutputStream

Methods inherited from class java.lang.Object

Constructor Detail

ServletOutputStream

Method Detail

print

print

print

print

print

print

print

println

println

println

println

println

println

println

println

isReady

setWriteListener