Question

How can i use a Filter just for servlets and not for jsp?

url-patterns :

/* - this makes the container to call the filter for servlets as well as jsp.
*.jsp - this makes the container to call the filter only for jsp.

Is there any way it calls the filter only for servlets..

Answer 1

Since filter is mapped to URL and the mapping is always “positive”, i.e. you cannot say “call this filter unless url is *.jsp) the only solution is create special URLs for either servlets or JSPs.

For example you can map all your servlets to URLs that end with *.do, e.g. create.do, delete.do etc.

<servlet-mapping>
    <servlet-name>Create Servlet</servlet-name>
    <url-pattern>/create.do</url-pattern>
</servlet-mapping>
<servlet-mapping>
    <servlet-name>Delete Servlet</servlet-name>
    <url-pattern>/delete.do</url-pattern>
</servlet-mapping>

Then you can create filter and map it to *.do:

<filter-mapping>
    <filter-name>actionsFilter</filter-name>
    <url-pattern>*.do</url-pattern>
</filter-mapping>

It will work for all servlets (because they are mapped to *.do) and will not work for JSPs (because they are not mapped to *.do).