Corby Jacobs wrote: > I am investigating an issue with a JSP page which, under certain > circumstances, generates a 22.4 MB file to send back to the client. > Turns out, a substantial portion of this page is whitespace. As I > see it, the whitespace is coming from two places: > > 1) whitespace the developer added to make the JSP more readable seems > to be repeated in the HTML sent to the client (and duplicated if it's > inside a <c:forEach> tag) > > and > > 2) the tags themselves are generating extra newline characters > > To address issue 1, I edited the JSP file, changed all tabs to one > blank space, and removed all empty lines. This reduced the size of > the file from 22.4MB to 4.1MB. Then, within the triple-nested > <c:forEach> loops, I made the code all one line -- very ugly, but > reduced the size of the HTML file to 367kB. > > To confirm my suspicions on issue 2, I re-wrote a small excerpt of > the page to use scriptlets instead of <c:forEach> and <c:if> tags. > The loop is used to generate a <select> with <option>s whose value > depend on the iteration through the loop. As you can see in the > excerpt from the "view page" source sent to the client, the version > generated with the core JSTL tags has extra whitespace between the > <option>s. Imagine doing this for a menu of 100 <option>s, 3 times, > and you can see where all the whitespace is coming from. I tested > this with both Tomcat and Weblogic as the web server. > > My question is this: Is there any way to avoid all this whitespace > caused by core JSTL tags? > [...]
JSP _preserves_ whitespace, so it's not really accurate to say that tags "generate" whitespace; what you see is the newlines after the tags being preserved. Anyway, the best way to handle it is probably to use a filter that compresses the response (most browsers supports compressed responses today) since that would reduce the space needed for both whitespace and repeated tags. See this article for an example of the implementation of such a filter: <http://www.javaworld.com/javaworld/jw-06-2001/jw-0622-filters.html> Another alternative is to use a filter that removes whitespace, but that requires parsing of the response. You may be able to do it using something like the W3C JTidy parser, assuming the HTML is basically well-formed. <http://sourceforge.net/projects/jtidy> Hans -- Hans Bergsten <[EMAIL PROTECTED]> Gefion Software <http://www.gefionsoftware.com/> Author of O'Reilly's "JavaServer Pages", covering JSP 1.2 and JSTL 1.0 Details at <http://TheJSPBook.com/> -- To unsubscribe, e-mail: <mailto:taglibs-user-unsubscribe@;jakarta.apache.org> For additional commands, e-mail: <mailto:taglibs-user-help@;jakarta.apache.org>