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handlePageException
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L B-62
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public abstract void handlePageException(Throwable t) throws ServletException, IOException
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Used to process an unhandled exceptions thrown by the current page Calls the ErrorPage if one is active
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APPENDIXES
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Calls the include() method associated with a RequestDispatcher for this servlet See javaxservletRequestDispatcher for details
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initialize
L B-64
public abstract void initialize( Servlet servlet, ServletRequest request, ServletResponse response, String errorPageURL, boolean needsSession, int bufferSize, boolean autoFlush) throws IOException, IllegalStateException, IllegalArgumentException
Stores the servlet, request, response, errorPageURL, needsSession, bufferSize, and autoFlush attributes and makes the appropriate implicit variables available to the JSP This method is called by the getPageContext() method and should not be called directly by the JSP author
popBody
L B-65
public JspWriter popBody()
Restores the JspWriter saved by the previous pushBody(), and updates the out implicit variable and the value of the PageContext "out" attribute
pushBody
L B-66
public BodyContent pushBody()
Saves the current JspWriter and creates a new BodyContent object, making it the value of the PageContext "out" attribute and the out implicit variable
release
L B-67
public abstract void release()
Performs the opposite of initialize, releasing the PageContext and the resources it acquired This method is called by the releasePageContext() method and should not be called directly by the JSP author
Appendix B:
JSP API Version 12
removeAttribute
L B-68
public abstract void removeAttribute(String name)
Searches the page, request, session, and application scopes (in that order) for the specified attribute and removes the first matching attribute
removeAttribute
L B-69
public abstract void removeAttribute(String name, int scope)
Removes the attribute associated with the specified name and scope Scope choices are indicated with the following constants: PageContextPAGE_SCOPE PageContextREQUEST_SCOPE PageContextSESSION_SCOPE PageContextAPPLICATION_SCOPE
setAttribute
L B-70
public abstract void setAttribute (String name, Object attribute)
Sets the specified attribute with page scope setAttribute(String name, Object o, int scope) can be used to set attributes in other scopes
setAttribute
L B-71
public abstract void setAttribute (String name, Object o, int scope)
Sets the attribute associated with the specified name and scope Scope choices are indicated with the following constants:
APPENDIXES
PageContextPAGE_SCOPE PageContextREQUEST_SCOPE PageContextSESSION_SCOPE PageContextAPPLICATION_SCOPE
JSP: The Complete Reference
Package javaxservletjsptagext
BodyContent
Full Name: Type: Extends: javaxservletjsptagextBodyContent Abstract class javaxservletjspJspWriter
BodyContent is a subclass of javaxservletjspJspWriter, but differs from its superclass, in that its contents aren't automatically written to the servlet output stream Instead, they're accumulated in what amounts to a string buffer After the tag body is completed, the original JspWriter is restored, but the BodyContent object is still available in doEndTag() in the bodyContent variable Its contents can be retrieved with its getString() or getReader() methods, modified as necessary, and written to the restored JspWriter output stream to be merged with the page output
Methods
clearBody
L B-72
public void clearBody()
Resets the BodyContent buffer to empty This can be useful if the body is being written to the enclosing writer in doAfterBody()
flush
L B-73
public void flush() throws IOException
Overrides the JspWriterflush() method so it always throws an exception Flushing a BodyContent writer isn't valid because it isn't connected to an actual output stream to which it could be written
getEnclosingWriter
L B-74
public JspWriter getEnclosingWriter()
Returns the writer object (possibly another BodyContent) next higher in the stack
Appendix B:
JSP API Version 12
getReader
L B-75
public abstract Reader getReader()
Returns a reader for the body content after it has been evaluated This reader can be passed to other classes that can process a javaioReader, such as StreamTokenizer, FilterReader, or an XML parser
getString
L B-76
public abstract String getString()
Returns a string containing the body content after it has been evaluated
writeOut
L B-77
public abstract void writeOut(Writer out) throws IOException
Writes the body content to the specified output writer
BodyTag
Full Name: Type: Superinterface: javaxservletjsptagextBodyTag Interface javaxservletjsptagextIterationTag
An extension of the IterationTag interface which adds new methods having to do with body handling
Methods
doInitBody
APPENDIXES
L B-78
public void doInitBody() throws JspException
A lifecycle method called after setBodyContent(), but just before the body is evaluated If the body is evaluated multiple times, this method is called only once
JSP: The Complete Reference
setBodyContent
L B-79
public void setBodyContent(BodyContent b)
Invoked by the JSP servlet after the current JspWriter has been pushed and a new BodyContent writer has been created This occurs just after doStartTag()
BodyTagSupport
Full Name: Type: Extends: Implements: javaxservletjsptagextBodyTagSupport Class javaxservletjsptagextTagSupport javaxservletjsptagextBodyTag
A useful base class that implements all the methods of BodyTag Tag handlers can extend BodyTagSupport and override only those methods that need to be changed
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