servletresponse.html

j2ee帮助文档软件设计/软件工程 文件格式

void <B>setBufferSize</B>(int&nbsp;size)</PRE>
<DL>
<DD>Sets the preferred buffer size for the body of the response.  
 The servlet container will use a buffer at least as large as 
 the size requested.  The actual buffer size used can be found
 using <code>getBufferSize</code>.

 <p>A larger buffer allows more content to be written before anything is
 actually sent, thus providing the servlet with more time to set
 appropriate status codes and headers.  A smaller buffer decreases 
 server memory load and allows the client to start receiving data more
 quickly.

 <p>This method must be called before any response body content is
 written; if content has been written or the response object has
 been committed, this method throws an 
 <code>IllegalStateException</code>.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>size</CODE> - the preferred buffer size
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/IllegalStateException.html" title="class or interface in java.lang">IllegalStateException</A></CODE> - if this method is called after
                                                content has been written<DT><B>See Also:</B><DD><A HREF="../../javax/servlet/ServletResponse.html#getBufferSize()"><CODE>getBufferSize()</CODE></A>, 
<A HREF="../../javax/servlet/ServletResponse.html#flushBuffer()"><CODE>flushBuffer()</CODE></A>, 
<A HREF="../../javax/servlet/ServletResponse.html#isCommitted()"><CODE>isCommitted()</CODE></A>, 
<A HREF="../../javax/servlet/ServletResponse.html#reset()"><CODE>reset()</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="getBufferSize()"><!-- --></A><H3>
getBufferSize</H3>
<PRE>
int <B>getBufferSize</B>()</PRE>
<DL>
<DD>Returns the actual buffer size used for the response.  If no buffering
 is used, this method returns 0.
<P>
<DD><DL>

<DT><B>Returns:</B><DD>the actual buffer size used<DT><B>See Also:</B><DD><A HREF="../../javax/servlet/ServletResponse.html#setBufferSize(int)"><CODE>setBufferSize(int)</CODE></A>, 
<A HREF="../../javax/servlet/ServletResponse.html#flushBuffer()"><CODE>flushBuffer()</CODE></A>, 
<A HREF="../../javax/servlet/ServletResponse.html#isCommitted()"><CODE>isCommitted()</CODE></A>, 
<A HREF="../../javax/servlet/ServletResponse.html#reset()"><CODE>reset()</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="flushBuffer()"><!-- --></A><H3>
flushBuffer</H3>
<PRE>
void <B>flushBuffer</B>()
                 throws <A HREF="http://java.sun.com/j2se/1.5/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD>Forces any content in the buffer to be written to the client.  A call
 to this method automatically commits the response, meaning the status 
 code and headers will be written.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.5/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></CODE><DT><B>See Also:</B><DD><A HREF="../../javax/servlet/ServletResponse.html#setBufferSize(int)"><CODE>setBufferSize(int)</CODE></A>, 
<A HREF="../../javax/servlet/ServletResponse.html#getBufferSize()"><CODE>getBufferSize()</CODE></A>, 
<A HREF="../../javax/servlet/ServletResponse.html#isCommitted()"><CODE>isCommitted()</CODE></A>, 
<A HREF="../../javax/servlet/ServletResponse.html#reset()"><CODE>reset()</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="resetBuffer()"><!-- --></A><H3>
resetBuffer</H3>
<PRE>
void <B>resetBuffer</B>()</PRE>
<DL>
<DD>Clears the content of the underlying buffer in the response without
 clearing headers or status code. If the 
 response has been committed, this method throws an 
 <code>IllegalStateException</code>.
<P>
<DD><DL>
<DT><B>Since:</B></DT>
  <DD>2.3</DD>
<DT><B>See Also:</B><DD><A HREF="../../javax/servlet/ServletResponse.html#setBufferSize(int)"><CODE>setBufferSize(int)</CODE></A>, 
<A HREF="../../javax/servlet/ServletResponse.html#getBufferSize()"><CODE>getBufferSize()</CODE></A>, 
<A HREF="../../javax/servlet/ServletResponse.html#isCommitted()"><CODE>isCommitted()</CODE></A>, 
<A HREF="../../javax/servlet/ServletResponse.html#reset()"><CODE>reset()</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="isCommitted()"><!-- --></A><H3>
isCommitted</H3>
<PRE>
boolean <B>isCommitted</B>()</PRE>
<DL>
<DD>Returns a boolean indicating if the response has been
 committed.  A committed response has already had its status 
 code and headers written.
<P>
<DD><DL>

<DT><B>Returns:</B><DD>a boolean indicating if the response has been
                committed<DT><B>See Also:</B><DD><A HREF="../../javax/servlet/ServletResponse.html#setBufferSize(int)"><CODE>setBufferSize(int)</CODE></A>, 
<A HREF="../../javax/servlet/ServletResponse.html#getBufferSize()"><CODE>getBufferSize()</CODE></A>, 
<A HREF="../../javax/servlet/ServletResponse.html#flushBuffer()"><CODE>flushBuffer()</CODE></A>, 
<A HREF="../../javax/servlet/ServletResponse.html#reset()"><CODE>reset()</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="reset()"><!-- --></A><H3>
reset</H3>
<PRE>
void <B>reset</B>()</PRE>
<DL>
<DD>Clears any data that exists in the buffer as well as the status code and
 headers.  If the response has been committed, this method throws an 
 <code>IllegalStateException</code>.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.5/docs/api/java/lang/IllegalStateException.html" title="class or interface in java.lang">IllegalStateException</A></CODE> - if the response has already been
                                   committed<DT><B>See Also:</B><DD><A HREF="../../javax/servlet/ServletResponse.html#setBufferSize(int)"><CODE>setBufferSize(int)</CODE></A>, 
<A HREF="../../javax/servlet/ServletResponse.html#getBufferSize()"><CODE>getBufferSize()</CODE></A>, 
<A HREF="../../javax/servlet/ServletResponse.html#flushBuffer()"><CODE>flushBuffer()</CODE></A>, 
<A HREF="../../javax/servlet/ServletResponse.html#isCommitted()"><CODE>isCommitted()</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="setLocale(java.util.Locale)"><!-- --></A><H3>
setLocale</H3>
<PRE>
void <B>setLocale</B>(<A HREF="http://java.sun.com/j2se/1.5/docs/api/java/util/Locale.html" title="class or interface in java.util">Locale</A>&nbsp;loc)</PRE>
<DL>
<DD>Sets the locale of the response, if the response has not been
 committed yet. It also sets the response's character encoding
 appropriately for the locale, if the character encoding has not
 been explicitly set using <A HREF="../../javax/servlet/ServletResponse.html#setContentType(java.lang.String)"><CODE>setContentType(java.lang.String)</CODE></A> or
 <A HREF="../../javax/servlet/ServletResponse.html#setCharacterEncoding(java.lang.String)"><CODE>setCharacterEncoding(java.lang.String)</CODE></A>, <code>getWriter</code> hasn't
 been called yet, and the response hasn't been committed yet.
 If the deployment descriptor contains a 
 <code>locale-encoding-mapping-list</code> element, and that
 element provides a mapping for the given locale, that mapping
 is used. Otherwise, the mapping from locale to character
 encoding is container dependent.
 <p>This method may be called repeatedly to change locale and
 character encoding. The method has no effect if called after the
 response has been committed. It does not set the response's
 character encoding if it is called after <A HREF="../../javax/servlet/ServletResponse.html#setContentType(java.lang.String)"><CODE>setContentType(java.lang.String)</CODE></A>
 has been called with a charset specification, after
 <A HREF="../../javax/servlet/ServletResponse.html#setCharacterEncoding(java.lang.String)"><CODE>setCharacterEncoding(java.lang.String)</CODE></A> has been called, after
 <code>getWriter</code> has been called, or after the response
 has been committed.
 <p>Containers must communicate the locale and the character encoding
 used for the servlet response's writer to the client if the protocol
 provides a way for doing so. In the case of HTTP, the locale is
 communicated via the <code>Content-Language</code> header,
 the character encoding as part of the <code>Content-Type</code>
 header for text media types. Note that the character encoding
 cannot be communicated via HTTP headers if the servlet does not
 specify a content type; however, it is still used to encode text
 written via the servlet response's writer.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>loc</CODE> - the locale of the response<DT><B>See Also:</B><DD><A HREF="../../javax/servlet/ServletResponse.html#getLocale()"><CODE>getLocale()</CODE></A>, 
<A HREF="../../javax/servlet/ServletResponse.html#setContentType(java.lang.String)"><CODE>setContentType(java.lang.String)</CODE></A>, 
<A HREF="../../javax/servlet/ServletResponse.html#setCharacterEncoding(java.lang.String)"><CODE>setCharacterEncoding(java.lang.String)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="getLocale()"><!-- --></A><H3>
getLocale</H3>
<PRE>
<A HREF="http://java.sun.com/j2se/1.5/docs/api/java/util/Locale.html" title="class or interface in java.util">Locale</A> <B>getLocale</B>()</PRE>
<DL>
<DD>Returns the locale specified for this response
 using the <A HREF="../../javax/servlet/ServletResponse.html#setLocale(java.util.Locale)"><CODE>setLocale(java.util.Locale)</CODE></A> method. Calls made to
 <code>setLocale</code> after the response is committed
 have no effect. If no locale has been specified,
 the container's default locale is returned.
<P>
<DD><DL>
<DT><B>See Also:</B><DD><A HREF="../../javax/servlet/ServletResponse.html#setLocale(java.util.Locale)"><CODE>setLocale(java.util.Locale)</CODE></A></DL>
</DD>
</DL>
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