Modify request parameters using a servlet filter

The EchoServlet writes the URL and request parameters on the response. The EchoServletFilter intercepts requests to /echo/* and wraps the original request in a EchoServletFilteredRequest which allows you to add or update parameters by calling addParameter(). As an example the EchoServletFilter adds 2 additional parameters ('extraParam1' and 'extraParam1').

Installing

Clone the repository

git clone https://github.com/briefjudofox/servlet-filter-example.git

Install with Maven

cd servlet-filter-example mvn install

Run with embedded Tomcat

mvn tomcat7:run

Open a new command line and run tests

mvn test

Run from cmd or browser

curl http://localhost:8080/ServletFilterExmaple/echo/ curl http://localhost:8080/ServletFilterExmaple/echo/?extraParam1=SomeInitialValue curl http://localhost:8080/ServletFilterExmaple/echo/?extraParam1=SomeInitialValue&foo=pants