Each interceptor you define must implementorg.springframework.web.servlet.HandlerInterceptor interface. There are three methods that
need to be implemented.
preHandle(..) is called before the actual handler is
executed;
The preHandle(..) method
returns a boolean value. You can use this method to break or continue the
processing of the execution chain. When this method returns true, the handler
execution chain will continue; when it returns false, the DispatcherServlet assumes the interceptor itself has taken care of requests (and, for
example, rendered an appropriate view) and does not continue executing the
other interceptors and the actual handler in the execution chain.
postHandle(..) is called after the handler is executed;
afterCompletion(..) is called after the complete request has finished.
How to implement?
1 1. Spring MVC to
configure it via <mvc:interceptors>tag within
spring-servlet.xml file.
<mvc:interceptors>
<bean class="raj.interceptor.HelloWorldInterceptor" />
</mvc:interceptors>
2. The Interceptor –
Spring MVC HandlerInterceptor
package raj.interceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
public class HelloWorldInterceptor
implements HandlerInterceptor
{
//overriding abstract method (mandatory)
@Override
public boolean preHandle(HttpServletRequest request,
HttpServletResponse response, Object handler) throws Exception {
System.out.println("Pre-handle");
return true;
}
//overriding abstract method (mandatory)
@Override
public void postHandle(HttpServletRequest request,
HttpServletResponse response, Object handler,
ModelAndView modelAndView) throws Exception {
System.out.println("Post-handle");
}
//overriding abstract method (mandatory)
@Override
public void afterCompletion(HttpServletRequest request,
HttpServletResponse response, Object handler, Exception ex)
throws Exception {
System.out.println("After completion handle");
}
}
3. use your filter logic in prehandle method of abovesaid class !!
its done..!!
