Javax. servlet. Filter usage

Step 1: Write the filter class to implement the filter Interface

Public class myfilter implements filter {// execute public void destroy () {system. out. println ("myfilter destroyed");} // execute each request once to filter all requests public void dofilter (servletrequest arg0, servletresponse arg1, filterchain arg2) throws ioexception, servletexception {system. out. println ("before going to the next filter"); arg2.dofilter (arg0, arg1); system. out. println ("go to the next filter");} // run public void Init (filterconfig arg0) throws servletexception {system. out. println ("myfilter started ");}}

Step 2: configure the Web. xml file

<Filter> <filter-Name> he </filter-Name> <filter-class> COM. he. util. myfilter </filter-class> </filter> <filter-mapping> <filter-Name> he </filter-Name> <URL-pattern>/* </url-Pattern> </filter-mapping>