JspWriterImpl

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

All Implemented Interfaces:

java.io.Closeable, java.io.Flushable, java.lang.Appendable, java.lang.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 What buffering problems? -kmc Add method for writing bytes. This allows static texts to be pre-encoded, for performance. Note that this can be done only if the page is unbuffered. -kmc

Field Summary

Fields
Modifier and Type Field and Description

protected ByteWriter byteOut

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

Fields
Modifier and Type	Field and Description
`protected ByteWriter`	`byteOut`
`protected boolean`	`implementsByteWriter`

Constructor Summary

Constructors
Constructor and Description
`JspWriterImpl()`
`JspWriterImpl(ServletResponse response)` Create a buffered character-output stream that uses a default-sized output buffer.
`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

All Methods Instance Methods Concrete 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.
`boolean`	`hasData()`
`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(java.lang.Object obj)` Print an object.
`void`	`print(java.lang.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(java.lang.Object x)` Print an Object and then terminate the line.
`void`	`println(java.lang.String x)` Print a String and then terminate the line.
`void`	`write(boolean bytesOK, byte[] buf, java.lang.String str)` Attempt to write a String pre-encoded with the page encoding.
`void`	`write(byte[] buf, int off, int len)`
`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(java.lang.String s)` Write a string.
`void`	`write(java.lang.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

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

- Field Detail
  - implementsByteWriter
```
protected boolean implementsByteWriter
```
  - byteOut
```
protected ByteWriter byteOut
```
- Constructor Detail
  - JspWriterImpl
```
public JspWriterImpl()
```
  - JspWriterImpl
```
public JspWriterImpl(ServletResponse response)
```
    Create a buffered character-output stream that uses a default-sized output buffer.
    
    Parameters:
    
    response - A Servlet Response
  - 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:
    
    java.lang.IllegalArgumentException - If sz is <= 0
- Method Detail
  - flushBuffer
```
protected final void flushBuffer()
                          throws java.io.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:
    
    java.io.IOException
  - clear
```
public final void clear()
                 throws java.io.IOException
```
    Discard the output buffer.
    
    Specified by:
    
    clear in class JspWriter
    
    Throws:
    
    java.io.IOException - If an I/O error occurs
  - clearBuffer
```
public void clearBuffer()
                 throws java.io.IOException
```
    Description copied from class: 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:
    
    java.io.IOException - If an I/O error occurs
  - flush
```
public void flush()
           throws java.io.IOException
```
    Flush the stream.
    
    Specified by:
    
    flush in interface java.io.Flushable
    
    Specified by:
    
    flush in class JspWriter
    
    Throws:
    
    java.io.IOException - If an I/O error occurs
  - close
```
public void close()
           throws java.io.IOException
```
    Close the stream.
    
    Specified by:
    
    close in interface java.io.Closeable
    
    Specified by:
    
    close in interface java.lang.AutoCloseable
    
    Specified by:
    
    close in class JspWriter
    
    Throws:
    
    java.io.IOException - If an I/O error occurs
  - getRemaining
```
public int getRemaining()
```
    Description copied from class: 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(boolean bytesOK,
                  byte[] buf,
                  java.lang.String str)
           throws java.io.IOException
```
    Attempt to write a String pre-encoded with the page encoding.
    
    Parameters:
    
    bytesOK - If true, write out the byte array, else, write out the String.
    
    buf - The text encoded with the page encoding
    
    str - The original text
    
    Throws:
    
    java.io.IOException
  - write
```
public void write(byte[] buf,
                  int off,
                  int len)
           throws java.io.IOException
```
    Throws:
    
    java.io.IOException
  - write
```
public void write(int c)
           throws java.io.IOException
```
    Write a single character.
    
    Overrides:
    
    write in class java.io.Writer
    
    Throws:
    
    java.io.IOException
  - write
```
public void write(char[] cbuf,
                  int off,
                  int len)
           throws java.io.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 java.io.Writer
    
    Parameters:
    
    cbuf - A character array
    
    off - Offset from which to start reading characters
    
    len - Number of characters to write
    
    Throws:
    
    java.io.IOException
  - write
```
public void write(char[] buf)
           throws java.io.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 java.io.Writer
    
    Throws:
    
    java.io.IOException
  - write
```
public void write(java.lang.String s,
                  int off,
                  int len)
           throws java.io.IOException
```
    Write a portion of a String.
    
    Overrides:
    
    write in class java.io.Writer
    
    Parameters:
    
    s - String to be written
    
    off - Offset from which to start reading characters
    
    len - Number of characters to be written
    
    Throws:
    
    java.io.IOException
  - write
```
public void write(java.lang.String s)
           throws java.io.IOException
```
    Write a string. This method cannot be inherited from the Writer class because it must suppress I/O exceptions.
    
    Overrides:
    
    write in class java.io.Writer
    
    Throws:
    
    java.io.IOException
  - newLine
```
public void newLine()
             throws java.io.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:
    
    java.io.IOException - If an I/O error occurs
  - print
```
public void print(boolean b)
           throws java.io.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:
    
    java.io.IOException - If an error occured while writing
  - print
```
public void print(char c)
           throws java.io.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:
    
    java.io.IOException - If an error occured while writing
  - print
```
public void print(int i)
           throws java.io.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:
    
    java.io.IOException - If an error occured while writing
    
    See Also:
    
    Integer.toString(int)
  - print
```
public void print(long l)
           throws java.io.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:
    
    java.io.IOException - If an error occured while writing
    
    See Also:
    
    Long.toString(long)
  - print
```
public void print(float f)
           throws java.io.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:
    
    java.io.IOException - If an error occured while writing
    
    See Also:
    
    Float.toString(float)
  - print
```
public void print(double d)
           throws java.io.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:
    
    java.io.IOException - If an error occured while writing
    
    See Also:
    
    Double.toString(double)
  - print
```
public void print(char[] s)
           throws java.io.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:
    
    java.lang.NullPointerException - If s is null
    
    java.io.IOException - If an error occured while writing
  - print
```
public void print(java.lang.String s)
           throws java.io.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:
    
    java.io.IOException - If an error occured while writing
  - print
```
public void print(java.lang.Object obj)
           throws java.io.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:
    
    java.io.IOException - If an error occured while writing
    
    See Also:
    
    Object.toString()
  - println
```
public void println()
             throws java.io.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:
    
    java.io.IOException - If an error occured while writing
  - println
```
public void println(boolean x)
             throws java.io.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:
    
    java.io.IOException - If an error occured while writing
  - println
```
public void println(char x)
             throws java.io.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:
    
    java.io.IOException - If an error occured while writing
  - println
```
public void println(int x)
             throws java.io.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:
    
    java.io.IOException - If an error occured while writing
  - println
```
public void println(long x)
             throws java.io.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:
    
    java.io.IOException - If an error occured while writing
  - println
```
public void println(float x)
             throws java.io.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:
    
    java.io.IOException - If an error occured while writing
  - println
```
public void println(double x)
             throws java.io.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:
    
    java.io.IOException - If an error occured while writing
  - println
```
public void println(char[] x)
             throws java.io.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:
    
    java.io.IOException - If an error occured while writing
  - println
```
public void println(java.lang.String x)
             throws java.io.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:
    
    java.io.IOException - If an error occured while writing
  - println
```
public void println(java.lang.Object x)
             throws java.io.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:
    
    java.io.IOException - If an error occured while writing
  - hasData
```
public boolean hasData()
```

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

Field Detail

implementsByteWriter

byteOut

Constructor Detail

JspWriterImpl

JspWriterImpl

JspWriterImpl

Method Detail

flushBuffer

clear

clearBuffer

flush

close

getRemaining

write

write

write

write

write

write

write

newLine

print

print

print

print

print

print

print

print

print

println

println

println

println

println

println

println

println

println

println

hasData