JspWriterImpl (Apache Tomcat 8.0.15 API Documentation)

java.lang.Object
- java.io.Writer
- - javax.servlet.jsp.JspWriter
  - - org.apache.jasper.runtime.JspWriterImpl

All Implemented Interfaces:

Closeable, Flushable, Appendable, AutoCloseable
```
public class JspWriterImpl
extends JspWriter
```
Write text to a character-output stream, buffering characters so as to provide for the efficient writing of single characters, arrays, and strings. Provide support for discarding for the output that has been buffered. This needs revisiting when the buffering problems in the JSP spec are fixed -akv

Author:

Anil K. Vijendran

Field Summary
- Fields inherited from class javax.servlet.jsp.JspWriter
  autoFlush, bufferSize, DEFAULT_BUFFER, NO_BUFFER, UNBOUNDED_BUFFER
- Fields inherited from class java.io.Writer
  lock

Constructor Summary

Constructors
Constructor and Description
`JspWriterImpl()`
`JspWriterImpl(ServletResponse response, int sz, boolean autoFlush)` Create a new buffered character-output stream that uses an output buffer of the given size.

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`clear()` Discard the output buffer.
`void`	`clearBuffer()` Clears the current contents of the buffer.
`void`	`close()` Close the stream.
`void`	`flush()` Flush the stream.
`protected void`	`flushBuffer()` Flush the output buffer to the underlying character stream, without flushing the stream itself.
`int`	`getRemaining()` This method returns the number of unused bytes in the buffer.
`void`	`newLine()` Write a line separator.
`void`	`print(boolean b)` Print a boolean value.
`void`	`print(char c)` Print a character.
`void`	`print(char[] s)` Print an array of characters.
`void`	`print(double d)` Print a double-precision floating-point number.
`void`	`print(float f)` Print a floating-point number.
`void`	`print(int i)` Print an integer.
`void`	`print(long l)` Print a long integer.
`void`	`print(Object obj)` Print an object.
`void`	`print(String s)` Print a string.
`void`	`println()` Terminate the current line by writing the line separator string.
`void`	`println(boolean x)` Print a boolean value and then terminate the line.
`void`	`println(char x)` Print a character and then terminate the line.
`void`	`println(char[] x)` Print an array of characters and then terminate the line.
`void`	`println(double x)` Print a double-precision floating-point number and then terminate the line.
`void`	`println(float x)` Print a floating-point number and then terminate the line.
`void`	`println(int x)` Print an integer and then terminate the line.
`void`	`println(long x)` Print a long integer and then terminate the line.
`void`	`println(Object x)` Print an Object and then terminate the line.
`void`	`println(String x)` Print a String and then terminate the line.
`void`	`write(char[] buf)` Write an array of characters.
`void`	`write(char[] cbuf, int off, int len)` Write a portion of an array of characters.
`void`	`write(int c)` Write a single character.
`void`	`write(String s, int off, int len)` Write a portion of a String.

Methods inherited from class javax.servlet.jsp.JspWriter
getBufferSize, isAutoFlush

Methods inherited from class java.io.Writer
append, append, append, write

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

- Constructor Detail
  - JspWriterImpl
```
public JspWriterImpl()
```
  - JspWriterImpl
```
public JspWriterImpl(ServletResponse response,
             int sz,
             boolean autoFlush)
```
    Create a new buffered character-output stream that uses an output buffer of the given size.
    
    Parameters:
    response - A Servlet Response
    sz - Output-buffer size, a positive integer
    
    Throws:
    
    IllegalArgumentException - If sz is <= 0
- Method Detail
  - flushBuffer
```
protected final void flushBuffer()
                          throws IOException
```
    Flush the output buffer to the underlying character stream, without flushing the stream itself. This method is non-private only so that it may be invoked by PrintStream.
    
    Throws:
    
    IOException
  - clear
```
public final void clear()
                 throws IOException
```
    Discard the output buffer.
    
    Specified by:
    
    clear in class JspWriter
    
    Throws:
    
    IOException - If an I/O error occurs
  - clearBuffer
```
public void clearBuffer()
                 throws IOException
```
    Description copied from class: javax.servlet.jsp.JspWriter
    
    Clears the current contents of the buffer. Unlike clear(), this method will not throw an IOException if the buffer has already been flushed. It merely clears the current content of the buffer and returns.
    
    Specified by:
    
    clearBuffer in class JspWriter
    
    Throws:
    
    IOException - If an I/O error occurs
  - flush
```
public void flush()
           throws IOException
```
    Flush the stream.
    
    Specified by:
    
    flush in interface Flushable
    
    Specified by:
    
    flush in class JspWriter
    
    Throws:
    
    IOException - If an I/O error occurs
  - close
```
public void close()
           throws IOException
```
    Close the stream.
    
    Specified by:
    
    close in interface Closeable
    
    Specified by:
    
    close in interface AutoCloseable
    
    Specified by:
    
    close in class JspWriter
    
    Throws:
    
    IOException - If an I/O error occurs
  - getRemaining
```
public int getRemaining()
```
    Description copied from class: javax.servlet.jsp.JspWriter
    
    This method returns the number of unused bytes in the buffer.
    
    Specified by:
    
    getRemaining in class JspWriter
    
    Returns:
    the number of bytes unused in the buffer
  - write
```
public void write(int c)
           throws IOException
```
    Write a single character.
    
    Overrides:
    
    write in class Writer
    
    Throws:
    
    IOException
  - write
```
public void write(char[] cbuf,
         int off,
         int len)
           throws IOException
```
    Write a portion of an array of characters.
    Ordinarily this method stores characters from the given array into this stream's buffer, flushing the buffer to the underlying stream as needed. If the requested length is at least as large as the buffer, however, then this method will flush the buffer and write the characters directly to the underlying stream. Thus redundant DiscardableBufferedWriters will not copy data unnecessarily.
    
    Specified by:
    
    write in class Writer
    
    Parameters:
    cbuf - A character array
    off - Offset from which to start reading characters
    len - Number of characters to write
    
    Throws:
    
    IOException
  - write
```
public void write(char[] buf)
           throws IOException
```
    Write an array of characters. This method cannot be inherited from the Writer class because it must suppress I/O exceptions.
    
    Overrides:
    
    write in class Writer
    
    Throws:
    
    IOException
  - write
```
public void write(String s,
         int off,
         int len)
           throws IOException
```
    Write a portion of a String.
    
    Overrides:
    
    write in class Writer
    
    Parameters:
    s - String to be written
    off - Offset from which to start reading characters
    len - Number of characters to be written
    
    Throws:
    
    IOException
  - newLine
```
public void newLine()
             throws IOException
```
    Write a line separator. The line separator string is defined by the system property line.separator, and is not necessarily a single newline ('\n') character.
    
    Specified by:
    
    newLine in class JspWriter
    
    Throws:
    
    IOException - If an I/O error occurs
  - print
```
public void print(boolean b)
           throws IOException
```
    Print a boolean value. The string produced by String.valueOf(boolean) is translated into bytes according to the platform's default character encoding, and these bytes are written in exactly the manner of the write(int) method.
    
    Specified by:
    
    print in class JspWriter
    
    Parameters:
    b - The boolean to be printed
    
    Throws:
    
    IOException - If an error occurred while writing
  - print
```
public void print(char c)
           throws IOException
```
    Print a character. The character is translated into one or more bytes according to the platform's default character encoding, and these bytes are written in exactly the manner of the write(int) method.
    
    Specified by:
    
    print in class JspWriter
    
    Parameters:
    c - The char to be printed
    
    Throws:
    
    IOException - If an error occurred while writing
  - print
```
public void print(int i)
           throws IOException
```
    Print an integer. The string produced by String.valueOf(int) is translated into bytes according to the platform's default character encoding, and these bytes are written in exactly the manner of the write(int) method.
    
    Specified by:
    
    print in class JspWriter
    
    Parameters:
    i - The int to be printed
    
    Throws:
    
    IOException - If an error occurred while writing
    See Also:
    Integer.toString(int)
  - print
```
public void print(long l)
           throws IOException
```
    Print a long integer. The string produced by String.valueOf(long) is translated into bytes according to the platform's default character encoding, and these bytes are written in exactly the manner of the write(int) method.
    
    Specified by:
    
    print in class JspWriter
    
    Parameters:
    l - The long to be printed
    
    Throws:
    
    IOException - If an error occurred while writing
    See Also:
    Long.toString(long)
  - print
```
public void print(float f)
           throws IOException
```
    Print a floating-point number. The string produced by String.valueOf(float) is translated into bytes according to the platform's default character encoding, and these bytes are written in exactly the manner of the write(int) method.
    
    Specified by:
    
    print in class JspWriter
    
    Parameters:
    f - The float to be printed
    
    Throws:
    
    IOException - If an error occurred while writing
    See Also:
    Float.toString(float)
  - print
```
public void print(double d)
           throws IOException
```
    Print a double-precision floating-point number. The string produced by String.valueOf(double) is translated into bytes according to the platform's default character encoding, and these bytes are written in exactly the manner of the write(int) method.
    
    Specified by:
    
    print in class JspWriter
    
    Parameters:
    d - The double to be printed
    
    Throws:
    
    IOException - If an error occurred while writing
    See Also:
    Double.toString(double)
  - print
```
public void print(char[] s)
           throws IOException
```
    Print an array of characters. The characters are converted into bytes according to the platform's default character encoding, and these bytes are written in exactly the manner of the write(int) method.
    
    Specified by:
    
    print in class JspWriter
    
    Parameters:
    s - The array of chars to be printed
    
    Throws:
    
    NullPointerException - If s is null
    
    IOException - If an error occurred while writing
  - print
```
public void print(String s)
           throws IOException
```
    Print a string. If the argument is null then the string "null" is printed. Otherwise, the string's characters are converted into bytes according to the platform's default character encoding, and these bytes are written in exactly the manner of the write(int) method.
    
    Specified by:
    
    print in class JspWriter
    
    Parameters:
    s - The String to be printed
    
    Throws:
    
    IOException - If an error occurred while writing
  - print
```
public void print(Object obj)
           throws IOException
```
    Print an object. The string produced by the String.valueOf(Object) method is translated into bytes according to the platform's default character encoding, and these bytes are written in exactly the manner of the write(int) method.
    
    Specified by:
    
    print in class JspWriter
    
    Parameters:
    obj - The Object to be printed
    
    Throws:
    
    IOException - If an error occurred while writing
    See Also:
    Object.toString()
  - println
```
public void println()
             throws IOException
```
    Terminate the current line by writing the line separator string. The line separator string is defined by the system property line.separator, and is not necessarily a single newline character ('\n'). Need to change this from PrintWriter because the default println() writes to the sink directly instead of through the write method...
    
    Specified by:
    
    println in class JspWriter
    
    Throws:
    
    IOException - If an error occurred while writing
  - println
```
public void println(boolean x)
             throws IOException
```
    Print a boolean value and then terminate the line. This method behaves as though it invokes print(boolean) and then println().
    
    Specified by:
    
    println in class JspWriter
    
    Parameters:
    x - the boolean to write
    
    Throws:
    
    IOException - If an error occurred while writing
  - println
```
public void println(char x)
             throws IOException
```
    Print a character and then terminate the line. This method behaves as though it invokes print(char) and then println().
    
    Specified by:
    
    println in class JspWriter
    
    Parameters:
    x - the char to write
    
    Throws:
    
    IOException - If an error occurred while writing
  - println
```
public void println(int x)
             throws IOException
```
    Print an integer and then terminate the line. This method behaves as though it invokes print(int) and then println().
    
    Specified by:
    
    println in class JspWriter
    
    Parameters:
    x - the int to write
    
    Throws:
    
    IOException - If an error occurred while writing
  - println
```
public void println(long x)
             throws IOException
```
    Print a long integer and then terminate the line. This method behaves as though it invokes print(long) and then println().
    
    Specified by:
    
    println in class JspWriter
    
    Parameters:
    x - the long to write
    
    Throws:
    
    IOException - If an error occurred while writing
  - println
```
public void println(float x)
             throws IOException
```
    Print a floating-point number and then terminate the line. This method behaves as though it invokes print(float) and then println().
    
    Specified by:
    
    println in class JspWriter
    
    Parameters:
    x - the float to write
    
    Throws:
    
    IOException - If an error occurred while writing
  - println
```
public void println(double x)
             throws IOException
```
    Print a double-precision floating-point number and then terminate the line. This method behaves as though it invokes print(double) and then println().
    
    Specified by:
    
    println in class JspWriter
    
    Parameters:
    x - the double to write
    
    Throws:
    
    IOException - If an error occurred while writing
  - println
```
public void println(char[] x)
             throws IOException
```
    Print an array of characters and then terminate the line. This method behaves as though it invokes print(char[]) and then println().
    
    Specified by:
    
    println in class JspWriter
    
    Parameters:
    x - the char[] to write
    
    Throws:
    
    IOException - If an error occurred while writing
  - println
```
public void println(String x)
             throws IOException
```
    Print a String and then terminate the line. This method behaves as though it invokes print(String) and then println().
    
    Specified by:
    
    println in class JspWriter
    
    Parameters:
    x - the String to write
    
    Throws:
    
    IOException - If an error occurred while writing
  - println
```
public void println(Object x)
             throws IOException
```
    Print an Object and then terminate the line. This method behaves as though it invokes print(Object) and then println().
    
    Specified by:
    
    println in class JspWriter
    
    Parameters:
    x - the Object to write
    
    Throws:
    
    IOException - If an error occurred while writing

Class JspWriterImpl

Field Summary

Fields inherited from class javax.servlet.jsp.JspWriter

Fields inherited from class java.io.Writer

Constructor Summary

Method Summary

Methods inherited from class javax.servlet.jsp.JspWriter

Methods inherited from class java.io.Writer

Methods inherited from class java.lang.Object

Constructor Detail

JspWriterImpl

JspWriterImpl

Method Detail

flushBuffer

clear

clearBuffer

flush

close

getRemaining

write

write

write

write

newLine

print

print

print

print

print

print

print

print

print

println

println

println

println

println

println

println

println

println

println