javax.servlet.jsp.tagext
类 BodyContent

java.lang.Object
  java.io.Writer
      javax.servlet.jsp.JspWriter
          javax.servlet.jsp.tagext.BodyContent

所有已实现的接口：

Closeable, Flushable, Appendable

直接已知子类：

BodyContentImpl

public abstract class BodyContent
extends JspWriter

An encapsulation of the evaluation of the body of an action so it is available to a tag handler. BodyContent is a subclass of JspWriter.

Note that the content of BodyContent is the result of evaluation, so it will not contain actions and the like, but the result of their invocation.

BodyContent has methods to convert its contents into a String, to read its contents, and to clear the contents.

The buffer size of a BodyContent object is unbounded. A BodyContent object cannot be in autoFlush mode. It is not possible to invoke flush on a BodyContent object, as there is no backing stream.

Instances of BodyContent are created by invoking the pushBody and popBody methods of the PageContext class. A BodyContent is enclosed within another JspWriter (maybe another BodyContent object) following the structure of their associated actions.

A BodyContent is made available to a BodyTag through a setBodyContent() call. The tag handler can use the object until after the call to doEndTag().

字段摘要

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

protected

BodyContent(JspWriter e) Protected constructor.

方法摘要

void	clearBody() Clear the body without throwing any exceptions.
void	flush() Redefined flush() so it is not legal.
JspWriter	getEnclosingWriter() Get the enclosing JspWriter.
abstract Reader	getReader() Return the value of this BodyContent as a Reader.
abstract String	getString() Return the value of the BodyContent as a String.
abstract void	writeOut(Writer out) Write the contents of this BodyContent into a Writer.

从类 javax.servlet.jsp.JspWriter 继承的方法

clear, clearBuffer, close, getBufferSize, getRemaining, isAutoFlush, newLine, print, print, print, print, print, print, print, print, print, println, println, println, println, println, println, println, println, println, println

从类 java.io.Writer 继承的方法

append, append, append, write, write, write, write, write

从类 java.lang.Object 继承的方法

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

构造方法详细信息

BodyContent

protected BodyContent(JspWriter e)

Protected constructor. Unbounded buffer, no autoflushing.

参数：

e - the enclosing JspWriter

方法详细信息

flush

public void flush()
           throws IOException

Redefined flush() so it is not legal.

It is not valid to flush a BodyContent because there is no backing stream behind it.

指定者：

接口 Flushable 中的 flush

指定者：

类 JspWriter 中的 flush

抛出：

IOException - always thrown

clearBody

public void clearBody()

Clear the body without throwing any exceptions.

getReader

public abstract Reader getReader()

Return the value of this BodyContent as a Reader.

返回：

the value of this BodyContent as a Reader

getString

public abstract String getString()

Return the value of the BodyContent as a String.

返回：

the value of the BodyContent as a String

writeOut

public abstract void writeOut(Writer out)
                       throws IOException

Write the contents of this BodyContent into a Writer. Subclasses may optimize common invocation patterns.

参数：

out - The writer into which to place the contents of this body evaluation

抛出：

IOException - if an I/O error occurred while writing the contents of this BodyContent to the given Writer

getEnclosingWriter

public JspWriter getEnclosingWriter()

Get the enclosing JspWriter.

返回：

the enclosing JspWriter passed at construction time