ServletOutputStream (Servlet 4.0 API Documentation

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

All Implemented Interfaces:

java.io.Closeable, java.io.Flushable, java.lang.AutoCloseable
```
public abstract class ServletOutputStream
extends java.io.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.

See Also:

ServletResponse

Constructor Summary

Constructors
Modifier Constructor and Description

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

Constructors
Modifier	Constructor and 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 and Description
`abstract boolean`	`isReady()` Checks if a non-blocking write will succeed.
`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(java.lang.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(java.lang.String s)` Writes a `String` to the client, followed by a carriage return-line feed (CRLF).
`abstract void`	`setWriteListener(WriteListener listener)` Sets the `WriteListener` for this `ServletOutputStream` and thereby switches to non-blocking IO.

Methods inherited from class java.io.OutputStream
close, flush, 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(java.lang.String s)
           throws java.io.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:
    
    java.io.IOException - if an input or output exception occurred
  - print
```
public void print(boolean b)
           throws java.io.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:
    
    java.io.IOException - if an input or output exception occurred
  - print
```
public void print(char c)
           throws java.io.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:
    
    java.io.IOException - if an input or output exception occurred
  - print
```
public void print(int i)
           throws java.io.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:
    
    java.io.IOException - if an input or output exception occurred
  - print
```
public void print(long l)
           throws java.io.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:
    
    java.io.IOException - if an input or output exception occurred
  - print
```
public void print(float f)
           throws java.io.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:
    
    java.io.IOException - if an input or output exception occurred
  - print
```
public void print(double d)
           throws java.io.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:
    
    java.io.IOException - if an input or output exception occurred
  - println
```
public void println()
             throws java.io.IOException
```
    Writes a carriage return-line feed (CRLF) to the client.
    
    Throws:
    
    java.io.IOException - if an input or output exception occurred
  - println
```
public void println(java.lang.String s)
             throws java.io.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:
    
    java.io.IOException - if an input or output exception occurred
  - println
```
public void println(boolean b)
             throws java.io.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:
    
    java.io.IOException - if an input or output exception occurred
  - println
```
public void println(char c)
             throws java.io.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:
    
    java.io.IOException - if an input or output exception occurred
  - println
```
public void println(int i)
             throws java.io.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:
    
    java.io.IOException - if an input or output exception occurred
  - println
```
public void println(long l)
             throws java.io.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:
    
    java.io.IOException - if an input or output exception occurred
  - println
```
public void println(float f)
             throws java.io.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:
    
    java.io.IOException - if an input or output exception occurred
  - println
```
public void println(double d)
             throws java.io.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:
    
    java.io.IOException - if an input or output exception occurred
  - isReady
```
public abstract boolean isReady()
```
    Checks if a non-blocking write will succeed. If this returns false, it will cause a callback to WriteListener.onWritePossible() when the buffer has emptied. If this method returns false no further data must be written until the contain calls WriteListener.onWritePossible().
    
    Returns:
    
    true if data can be written, else false
    
    Since:
    
    Servlet 3.1
  - setWriteListener
```
public abstract void setWriteListener(WriteListener listener)
```
    Sets the WriteListener for this ServletOutputStream and thereby switches to non-blocking IO. It is only valid to switch to non-blocking IO within async processing or HTTP upgrade processing.
    
    Parameters:
    
    listener - The non-blocking IO write listener
    
    Throws:
    
    java.lang.IllegalStateException - If this method is called if neither async nor HTTP upgrade is in progress or if the WriteListener has already been set
    
    java.lang.NullPointerException - If listener 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