Hi,
I was trying to create a Filter that generates the some content as files (if
required) into the file system and lets the default servlet handle the rest.
However I noticed that if the uri was such that TC would interpret it as
"static content" like /foobar.html - I would get a 404 on the first request.
If the uri refers to more dynamic content such as /foobar.jsp - you don't
get a 404.
Assuming this is because of TC:s static content caching I tried to disable
it by setting context parameters cacheTTL to zero and cachingAllowed to
false. This worked with static uri's like /foobar.html but not with
/foobar.jsp or /foobar/.
Another interesting feature seemed to be that if the uri refers to a
"directory" like /foobar/ and eventhough the "dynamic" index.jsp has been
generated by the filter, 404 is still the result on the first request.
So the question is: how to force TC to check if file exists in real time?
Below a test Filter do demonstrate. Try uris like:
/somepage.jsp -> loaded on first request but cached
/somepage.html -> not loaded on first request (unless you have disabled
static caching from context)
/somedirectory/ -> not loaded on first request
/somenewdirectory/?forward=1 -> loaded on first request
-jukka-
ps. tested on TC 6.0.14.
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import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Date;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
/**
*
* @author jsr
*/
public class FilterThatGeneratesContent implements Filter {
private FilterConfig filterConfig = null;
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain)
throws IOException, ServletException {
HttpServletRequest httpRequest = (HttpServletRequest) request;
String uri = httpRequest.getRequestURI();
// assumes not deployed as ROOT
String relativeURI = uri.substring(uri.indexOf("/", 1),
uri.length());
if (relativeURI.equals("/")) {
relativeURI = "index.jsp";
} else if (relativeURI.endsWith("/")) {
relativeURI += "index.jsp";
}
try {
createFile(relativeURI);
if (request.getParameter("include") != null) {
httpRequest.getRequestDispatcher(relativeURI).
include(request, response);
} else if (request.getParameter("forward") != null) {
httpRequest.getRequestDispatcher(relativeURI).
forward(request, response);
} else {
chain.doFilter(request, response);
}
} catch (Exception e) {
throw new ServletException(e);
}
}
private void createFile(String relativeURI) throws Exception {
String webAppDir = filterConfig.getServletContext().getRealPath("");
File contentFile = new File(webAppDir, relativeURI);
contentFile.getParentFile().mkdirs();
FileWriter writer = new FileWriter(contentFile);
writer.write("<html><body>" +
"<pre>" +
"Current Servlet time: " + new Date() +
"<br/>" +
"Current JSP time: <%=new java.util.Date()%><br/>" +
"</pre>");
writer.flush();
writer.close();
}
public void destroy() {
}
public void init(FilterConfig filterConfig) {
this.filterConfig = filterConfig;
}
}
