Servlet 3.0

With the advent pf 3.0 drastic change has come while working with  servlets . J2EE 6  has many changes .

Few imp changes are 

• No need of having 1 big web.xml .instaed multiple web-fragment.xml can be there
• Dynamic registration of servlets , filters
• Use of annotations

Here i am putting few important annotations provided by specs servlet 3.0  .

@WebServlet

(asyncSupported = false, name = "HelloServlet", urlPatterns = {"/hello"},
initParams = {@WebInitParam(name="param1", value="value1"), 

@WebInitParam(name="param2", value="value2")}
)

 public class TestServlet extends javax.servlet.http.HttpServlet { 

    ....   } 

----------------------------------------------------------  

 @WebFilter

(urlPatterns={"/myurl"},
   initParams={ @InitParam(name="mesg", value="my filter") }) 

  public class TestFilter implements javax.servlet.Filter {
        ....
        public void init(FilterConfig filterConfig) throws ServletException {   
         ....   }

        public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
            ....
        }

        public void destroy() {
            ....
        }
    }

---------------------------------------------------------

@WebServletContextListener
    public class TestServletContextListener implements javax.servlet.ServletContextListener {
        ....
        public void contextInitialized(ServletContextEvent sce) {
            ....
        }

        public void contextDestroyed(ServletContextEvent sce) {
            ....
        }
    } 




---------------------------------------------------------




@MultipartConfig(location="c:\\tmp", fileSizeThreshold=1024*1024,

 maxFileSize=1024*1024*5, maxRequestSize=1024*1024*5*5)

Above annotation can be used along with @WebServlet

For ordering of Filter  / Servlets  < absolute - ordering > tag 

should be configured in web.xml