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public class SomeServlet extends HttpServlet {
//...
private static final int ERROR_NOT_FOUND = 404;
private static final int ERROR_INTERNAL = 503;
//...
protected void doPost(HttpServletRequest req, HttpSerletResponse resp) {
//...
if (buff != null) {
if (buff.length == 0) {
resp.sendError(ERROR_INTERNAL);
}
//...
} else {
resp.sendError(ERROR_NOT_FOUND);
}
}
}
http://download.oracle.com/javaee/6/api/javax/servlet/http/HttpServletResponse.html