根据Tomcat上下文更改servlet映射

Question

I'd like to assign a different default servlet when inside a particular Tomcat context.

For example, when inside my root context, I want to use the following servlet mapping:

  <servlet-mapping>
    <servlet-name>PageServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

But when inside a context located on path /img-data , I want to use:

  <servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

Is this possible?

Answer 1

If your application runs in servlet 3.0+ container you could use a ServletContextListener to dynamically set the default servlet, depending on the context path.

public class MyServletContextListener implements ServletContextListener {
    @Override public void contextInitialized(ServletContextEvent event) {
        ServletContext sc = event.getServletContext();
        if ("".equals(sc.getContextPath())) {
            ServletRegistration.Dynamic dreg = sc.addServlet("pageservlet", new PageServlet());
            dreg.addMapping("");
        }
    }
}