Class ServletForwardingController

java.lang.Object
org.springframework.context.support.ApplicationObjectSupport
org.springframework.web.context.support.WebApplicationObjectSupport
org.springframework.web.servlet.support.WebContentGenerator
org.springframework.web.servlet.mvc.AbstractController
org.springframework.web.servlet.mvc.ServletForwardingController
All Implemented Interfaces:
org.springframework.beans.factory.Aware, org.springframework.beans.factory.BeanNameAware, org.springframework.context.ApplicationContextAware, org.springframework.web.context.ServletContextAware, Controller
public class ServletForwardingController extends AbstractController implements org.springframework.beans.factory.BeanNameAware
Spring Controller implementation that forwards to a named servlet, i.e. the "servlet-name" in web.xml rather than a URL path mapping. A target servlet doesn't even need a "servlet-mapping" in web.xml in the first place: A "servlet" declaration is sufficient.

Useful to invoke an existing servlet via Spring's dispatching infrastructure, for example to apply Spring HandlerInterceptors to its requests. This will work even in a minimal Servlet container that does not support Servlet filters.

Example: web.xml, mapping all "/myservlet" requests to a Spring dispatcher. Also defines a custom "myServlet", but without servlet mapping. 

<servlet>
  <servlet-name>myServlet</servlet-name>
  <servlet-class>mypackage.TestServlet</servlet-class>
</servlet>

<servlet>
  <servlet-name>myDispatcher</servlet-name>
  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
</servlet>

<servlet-mapping>
  <servlet-name>myDispatcher</servlet-name>
  <url-pattern>/myservlet</url-pattern>
</servlet-mapping>
Example: myDispatcher-servlet.xml, in turn forwarding "/myservlet" to your servlet (identified by servlet name). All such requests will go through the configured HandlerInterceptor chain (for example, an OpenSessionInViewInterceptor). From the servlet point of view, everything will work as usual. 
<bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
  <property name="interceptors">
    <list>
      <ref bean="openSessionInViewInterceptor"/>
    </list>
  </property>
  <property name="mappings">
    <props>
      <prop key="/myservlet">myServletForwardingController</prop>
    </props>
  </property>
</bean>

<bean id="myServletForwardingController" class="org.springframework.web.servlet.mvc.ServletForwardingController">
  <property name="servletName"><value>myServlet</value></property>
</bean>
Since:
1.1.1
Author:
Juergen Hoeller
See Also:
  • ServletWrappingController
  • invalid reference 
    org.springframework.orm.jpa.support.OpenEntityManagerInViewInterceptor
  • invalid reference 
    org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter

  • Constructor Details

    • ServletForwardingController

      public ServletForwardingController()

  • Method Details

    • setServletName

      public void setServletName(String servletName)
      Set the name of the servlet to forward to, i.e. the "servlet-name" of the target servlet in web.xml.

      Default is the bean name of this controller.

    • setBeanName

      public void setBeanName(String name)
      Specified by:
      setBeanName in interface org.springframework.beans.factory.BeanNameAware

    • handleRequestInternal

      protected @Nullable ModelAndView handleRequestInternal(jakarta.servlet.http.HttpServletRequest request, jakarta.servlet.http.HttpServletResponse response) throws Exception
      Description copied from class: AbstractController
      Template method. Subclasses must implement this. The contract is the same as for handleRequest.
      Specified by:
      handleRequestInternal in class AbstractController
      Throws:
      Exception
      See Also:

    • useInclude

      protected boolean useInclude(jakarta.servlet.http.HttpServletRequest request, jakarta.servlet.http.HttpServletResponse response)
      Determine whether to use RequestDispatcher's include or forward method.

      Performs a check whether an include URI attribute is found in the request, indicating an include request, and whether the response has already been committed. In both cases, an include will be performed, as a forward is not possible anymore.

      Parameters:
      request - current HTTP request
      response - current HTTP response
      Returns:
      true for include, false for forward
      See Also:
      • RequestDispatcher.forward(ServletRequest, ServletResponse)
      • RequestDispatcher.include(ServletRequest, ServletResponse)
      • ServletResponse.isCommitted()
      • WebUtils.isIncludeRequest(ServletRequest)