org.apache.jasper.runtime
类 JspWriterImpl

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

所有已实现的接口：

Closeable, Flushable, Appendable

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

作者：

Anil K. Vijendran, Kin-man Chung

字段摘要

protected ByteWriter	byteOut
protected boolean	implementsByteWriter

从类 javax.servlet.jsp.JspWriter 继承的字段

autoFlush, bufferSize, DEFAULT_BUFFER, NO_BUFFER, UNBOUNDED_BUFFER

从类 java.io.Writer 继承的字段

lock

构造方法摘要

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.

方法摘要

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(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(boolean bytesOK, byte[] buf, 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(String s) Write a string.
void	write(String s, int off, int len) Write a portion of a String.

从类 javax.servlet.jsp.JspWriter 继承的方法

getBufferSize, isAutoFlush

从类 java.io.Writer 继承的方法

append, append, append

从类 java.lang.Object 继承的方法

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

字段详细信息

implementsByteWriter

protected boolean implementsByteWriter

byteOut

protected ByteWriter byteOut

构造方法详细信息

JspWriterImpl

public JspWriterImpl()

JspWriterImpl

public JspWriterImpl(ServletResponse response)

Create a buffered character-output stream that uses a default-sized output buffer.

参数：

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.

参数：

response - A Servlet Response

sz - Output-buffer size, a positive integer

抛出：

IllegalArgumentException - If sz is <= 0

方法详细信息

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.

抛出：

IOException

clear

public final void clear()
                 throws IOException

Discard the output buffer.

指定者：

类 JspWriter 中的 clear

抛出：

IOException - If an I/O error occurs

clearBuffer

public void clearBuffer()
                 throws IOException

从类 JspWriter 复制的描述

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.

指定者：

类 JspWriter 中的 clearBuffer

抛出：

IOException - If an I/O error occurs

flush

public void flush()
           throws IOException

Flush the stream.

指定者：

接口 Flushable 中的 flush

指定者：

类 JspWriter 中的 flush

抛出：

IOException - If an I/O error occurs

close

public void close()
           throws IOException

Close the stream.

指定者：

接口 Closeable 中的 close

指定者：

类 JspWriter 中的 close

抛出：

IOException - If an I/O error occurs

getRemaining

public int getRemaining()

从类 JspWriter 复制的描述

This method returns the number of unused bytes in the buffer.

指定者：

类 JspWriter 中的 getRemaining

返回：

the number of bytes unused in the buffer

write

public void write(boolean bytesOK,
                  byte[] buf,
                  String str)
           throws IOException

Attempt to write a String pre-encoded with the page encoding.

参数：

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

抛出：

IOException

write

public void write(byte[] buf,
                  int off,
                  int len)
           throws IOException

抛出：

IOException

write

public void write(int c)
           throws IOException

Write a single character.

覆盖：

类 Writer 中的 write

抛出：

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.

指定者：

类 Writer 中的 write

参数：

cbuf - A character array

off - Offset from which to start reading characters

len - Number of characters to write

抛出：

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.

覆盖：

类 Writer 中的 write

抛出：

IOException

write

public void write(String s,
                  int off,
                  int len)
           throws IOException

Write a portion of a String.

覆盖：

类 Writer 中的 write

参数：

s - String to be written

off - Offset from which to start reading characters

len - Number of characters to be written

抛出：

IOException

write

public void write(String s)
           throws IOException

Write a string. This method cannot be inherited from the Writer class because it must suppress I/O exceptions.

覆盖：

类 Writer 中的 write

抛出：

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.

指定者：

类 JspWriter 中的 newLine

抛出：

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.

指定者：

类 JspWriter 中的 print

参数：

b - The boolean to be printed

抛出：

IOException - If an error occured 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.

指定者：

类 JspWriter 中的 print

参数：

c - The char to be printed

抛出：

IOException - If an error occured 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.

指定者：

类 JspWriter 中的 print

参数：

i - The int to be printed

抛出：

IOException - If an error occured while writing

另请参见：

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.

指定者：

类 JspWriter 中的 print

参数：

l - The long to be printed

抛出：

IOException - If an error occured while writing

另请参见：

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.

指定者：

类 JspWriter 中的 print

参数：

f - The float to be printed

抛出：

IOException - If an error occured while writing

另请参见：

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.

指定者：

类 JspWriter 中的 print

参数：

d - The double to be printed

抛出：

IOException - If an error occured while writing

另请参见：

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.

指定者：

类 JspWriter 中的 print

参数：

s - The array of chars to be printed

抛出：

NullPointerException - If s is null

IOException - If an error occured 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.

指定者：

类 JspWriter 中的 print

参数：

s - The String to be printed

抛出：

IOException - If an error occured 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.

指定者：

类 JspWriter 中的 print

参数：

obj - The Object to be printed

抛出：

IOException - If an error occured while writing

另请参见：

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...

指定者：

类 JspWriter 中的 println

抛出：

IOException - If an error occured 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().

指定者：

类 JspWriter 中的 println

参数：

x - the boolean to write

抛出：

IOException - If an error occured 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().

指定者：

类 JspWriter 中的 println

参数：

x - the char to write

抛出：

IOException - If an error occured 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().

指定者：

类 JspWriter 中的 println

参数：

x - the int to write

抛出：

IOException - If an error occured 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().

指定者：

类 JspWriter 中的 println

参数：

x - the long to write

抛出：

IOException - If an error occured 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().

指定者：

类 JspWriter 中的 println

参数：

x - the float to write

抛出：

IOException - If an error occured 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().

指定者：

类 JspWriter 中的 println

参数：

x - the double to write

抛出：

IOException - If an error occured 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().

指定者：

类 JspWriter 中的 println

参数：

x - the char[] to write

抛出：

IOException - If an error occured 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().

指定者：

类 JspWriter 中的 println

参数：

x - the String to write

抛出：

IOException - If an error occured 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().

指定者：

类 JspWriter 中的 println

参数：

x - the Object to write

抛出：

IOException - If an error occured while writing

hasData

public boolean hasData()