I haven't really looked at the 2.1 API yet, but I solved the
problem for me w/ the attached class. Works nicely to put your
whole servlet and everything in 1 jar file w/o any hassle setting
it up.
jason
On Tue, 11 May 1999, Craig R. McClanahan wrote:
> Andy Jefferson wrote:
>
> You are right ... there should be such mechanisms. What you need was added to the
> version 2.1 API specification for servlets, in the form of
> ServletContext.getResource(). However, at this point in time, Apache JServ
> version 1.0b4 supports only the 2.0 API, which does not include this capability.
>
> Work is in progress on 2.1 compatibility for Apache JServ version 1.1. Volunteers
> are needed to complete the coding, testing, and documentation.
Jason Gilbert | http://www.scott.net/~jason/
------------------------------------------------------
I wish I could make the garbage collector thread in my
brain less aggressive.
/*_______________________________________________________________________
*
* COPYRIGHT (c) 1999 DOOZER SOFTWARE, INC. - ALL RIGHTS RESERVED
* |
* _/_/ S O F T W A R E, I N C. |
* _/ _/ |
* _/ _/ _/_/ _/_/ _/_/_/ _/_/ _/_/ |
* _/ _/ _/ _/ _/ _/ _/ _/ _/_/ |
* _/_/ _/_/ _/_/ _/_/_/ _/_/ _/ _/|
* ________________________________________|
*_______________________________________________________________________
*/
/**
* You may use this class under the terms of the LGPL as specified by the
* Free Software Foundation. http://www.fsf.org/copyleft/lesser.html
*/
/**
* This servlet allows for loading a resource using the PATHINFO of the calling
* URL. The easiest way to use this servlet is to make a subclass of it in
* your own package hierarchy and then use paths relative to that directory.
*
* So, if you have a package under com/yoyodyne/servlet/ with your servlets in
* it. Make a subclass com.yoyodyne.servlet.ResourceServlet (or whatever you
* wnat to call it and you can create an alias to it. Then put your images or
* whatever files in directories under com/yoyodyne/servlet. You can then
* access those images, etc. using URLs like:
*
* http://hostname/servlet-dir/resource-alias/images/image1.gif
* http://hostname/servlet-dir/resource-alias/js/javascript.js
*/
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.net.URL;
import java.net.URLConnection;
public class ResourceServlet extends HttpServlet
{
private static final int MAX_RESOURCE_SIZE = 4096;
private String resourcePrefix = null;
public void init(ServletConfig config) throws ServletException
{
super.init(config);
resourcePrefix = config.getInitParameter("resourcePrefix");
if (resourcePrefix != null && resourcePrefix.charAt(0) != '/') {
resourcePrefix = "/" + resourcePrefix;
}
}
/**
* checks for path info information from the request URL and if it's
* available calls the doResource method to load the resource using
* Class.getResource() and sends it back to the client w/ the proper
* content-type
*/
protected void service(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException
{
String resource = req.getPathInfo();
if (resource != null && !resource.equals("")) {
for (int i = 0; i < resource.length(); i++) {
if (resource.charAt(i) != '/') {
resource = resource.substring(i);
break;
}
}
if (!resource.equals("/")) {
doResource(req, resp, resource);
resource = null;
return;
}
}
super.service(req, resp);
}
/**
* @param resource the name of the resource to load with any preceding '/'
* removed
*/
protected void doResource(HttpServletRequest req, HttpServletResponse resp,
String resource)
throws ServletException, IOException
{
URL url = this.getClass().getResource(resource);
if (url == null) {
url = this.getClass().getResource(resourcePrefix + "/" + resource);
if (url == null) {
resp.sendError(HttpServletResponse.SC_NOT_FOUND,
"Resource not found" + HttpUtils.getRequestURL(req).
append("/").append(resource).append("."));
return;
}
}
URLConnection con = url.openConnection();
con.setUseCaches(true);
resp.setContentType(con.getContentType());
resp.setDateHeader("Last-Modified", con.getLastModified());
int count = con.getContentLength();
byte[] buf = null;
if (count > 0) {
resp.setContentLength(count);
if (count < MAX_RESOURCE_SIZE) {
buf = new byte[count];
} else {
buf = new byte[MAX_RESOURCE_SIZE/2];
}
}
InputStream in = con.getInputStream();
OutputStream out = resp.getOutputStream();
while ((count = in.read(buf, 0, buf.length)) > 0) {
out.write(buf, 0, count);
}
in.close();
out.flush();
out.close();
url = null;
con = null;
buf = null;
}
}
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