I'm looking for the way to handle pre & post processing of Controller in Spring Boot + thymeleaf - spring-boot

Question

I have been looking for the way to handle pre & post processing of controller.
I want to add a procedure for every request & response.
For example:
Checking every requested header or adding hidden field include hash code in every form tags we response.
If there is sample, or any idea,give me please.

Answer 1

Thanks for advice.
I was able to find the result from this page.
http://www.concretepage.com/spring/spring-mvc/spring-handlerinterceptor-annotation-example-webmvcconfigureradapter
public class WebConfig extends WebMvcConfigurerAdapter {
#Override
public void addInterceptors(InterceptorRegistry registry) {
super.addInterceptors(registry);
registry.addInterceptor(new ControllerHandler());
TransactionInterceptor transactionInterceptor = new TransactionInterceptor();
}
}
public class ControllerHandler implements HandlerInterceptor {
#Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
System.out.println("---Before Method Execution---");
return true;
}
#Override
public void postHandle( HttpServletRequest request, HttpServletResponse response,
Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("---method executed---");
}
#Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response,
Object handler, Exception ex) throws Exception {
System.out.println("---Request Completed---");
}
}

Answer 2

I found another way to do,using #ControllerAdvice.
This annotaion seems to focus Error Handling.
http://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/web/bind/annotation/ControllerAdvice.html1
#ControllerAdvice
public class ExceptionControllerAdvice {
#InitBinder
public void initBinder(WebDataBinder binder) {
System.out.println("controller advice: init binder");
}
#ExceptionHandler(Exception.class)
public String exception(Exception e) {
System.out.println("controller advice: exception Handler");
System.out.println(e.getMessage());
return "error";
}
#ModelAttribute
public void modelAttribute(){
System.out.println("controller advice:model Attribute");
}
}