MyFilter.java
package com.ivoronline.springboot_filter_extends_onceperrequestfilter.filters;
import org.springframework.stereotype.Component;
import org.springframework.web.filter.OncePerRequestFilter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@Component
public class MyFilter extends OncePerRequestFilter {
@Override
public void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
throws IOException, ServletException {
//THIS CODE IS EXECUTED DURING HTTP REQUEST
System.out.println("MyFilter : Code for HTTP Request");
//CALLS
// - doFilter() METHOD OF THE NEXT FILTER IN CHAIN
// - Endpoint IF THERE ARE NO MORE FILTERS IN CHAIN
//RETURNS FROM THIS METHOD DURING HTTP RESPONSE
// - CAUSING SUBSEQUENT CODE TO BE EXECUTED DURING HTTP RESPONSE
// - CAUSING FILTERS TO BE EXECUTED IN REVERSE ORDER DURING HTTP RESPONSE (BUT ONLY BELOW CODE)
chain.doFilter(request, response); //DIVIDES HTTP REQUEST AND RESPONSE CODE
//THIS CODE IS EXECUTED DURING HTTP RESPONSE
System.out.println("MyFilter : Code for HTTP Response");
}
}