Web Filters demo

Author: AndriiPiatakha

online-store.web/src/main/java/com/itbulls/learnit/onlinestore/web/filters/HelloWorldFilter.java

@@ -0,0 +1,30 @@
+package com.itbulls.learnit.onlinestore.web.filters;
+
+import jakarta.servlet.http.HttpFilter;
+import java.io.IOException;
+import jakarta.servlet.DispatcherType;
+import jakarta.servlet.FilterChain;
+import jakarta.servlet.FilterConfig;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.ServletRequest;
+import jakarta.servlet.ServletResponse;
+import jakarta.servlet.annotation.WebFilter;
+
+/**
+ * Servlet Filter implementation class HelloWorldFilter
+ */
+//@WebFilter(dispatcherTypes = {DispatcherType.REQUEST }
+//					, urlPatterns = { "/*" })
+public class HelloWorldFilter extends HttpFilter {
+	
+	public void init(FilterConfig config) {
+		System.out.println(config.getInitParameter("initParam"));
+	}
+	
+	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
+		System.out.println("Hello World!");
+		chain.doFilter(request, response);
+		
+	}
+
+}

online-store.web/src/main/webapp/WEB-INF/web.xml

@@ -58,4 +58,18 @@ http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
 		<session-timeout>15</session-timeout>
 	</session-config>
 
+	<filter>
+		<filter-name>helloFilter</filter-name>
+		<filter-class>com.itbulls.learnit.onlinestore.web.filters.HelloWorldFilter</filter-class>
+		<init-param>
+			<param-name>initParam</param-name>
+			<param-value>Init Param</param-value>
+		</init-param>
+	</filter>
+
+	<filter-mapping>
+		<filter-name>helloFilter</filter-name>
+		<url-pattern>/*</url-pattern>
+	</filter-mapping>
+
 </web-app>