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Alex Chaffee

Use req.getRequestURI() or req.getServletPath(). The former returns the path to the script including any extra path information following the name of the servlet; the latter strips the extra path info. For example:

URL	http://www.purpletech.com/servlets/HelloEcho/extra/info?height=100&width=200
getRequestURI	/servlets/HelloEcho/extra/info
getServletPath	/servlets/HelloEcho
getPathInfo	/extra/info
getQueryString	height=100&width=200

This is useful if your form is self-referential; that is, it generates a form which calls itself again. For example:

out.println("<FORM METHOD=POST ACTION="" +
	    res.encodeURL(req.getServletPath()) +
	    "">");
out.println("<INPUT NAME=value>");
out.println("<INPUT TYPE=submit>");
out.println("</FORM>");

(encodeURL adds session information if necessary. See the Sun Servlet Tutorial and this FAQ's Session Tracking question. Note that this method was renamed from "encodeUrl" to the properly-capitalized "encodeURL" somewhere around version 2.1 of the servlet spec.)

Note that early versions of Java Web Server and some servlet engines had a bug whereby getRequestURI would also return the GET parameters following the extra path info.