Program in JSP to Display Multiple Filters

The following example code demonstrates how to write a Program in JSP to Display Multiple Filters.

Here is an example code for a JSP program that displays multiple filters.

Filter1.java

import java.io.IOException;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;

@WebFilter("/filter1")
public class Filter1 implements Filter {
   public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
         throws IOException, ServletException {
      System.out.println("Filter 1 is called");
      chain.doFilter(request, response);
   }

   public void init(FilterConfig fConfig) throws ServletException {}
   public void destroy() {}
}

Filter2.java

import java.io.IOException;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;

@WebFilter("/filter2")
public class Filter2 implements Filter {
   public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
         throws IOException, ServletException {
      System.out.println("Filter 2 is called");
      chain.doFilter(request, response);
   }

   public void init(FilterConfig fConfig) throws ServletException {}
   public void destroy() {}
}

web.xml

<web-app>
   <filter>
      <filter-name>Filter1</filter-name>
      <filter-class>Filter1</filter-class>
   </filter>
   <filter-mapping>
      <filter-name>Filter1</filter-name>
      <url-pattern>/filter1</url-pattern>
   </filter-mapping>

   <filter>
      <filter-name>Filter2</filter-name>
      <filter-class>Filter2</filter-class>
   </filter>
   <filter-mapping>
      <filter-name>Filter2</filter-name>
      <url-pattern>/filter2</url-pattern>
   </filter-mapping>
</web-app>

This code defines two filters, Filter1 and Filter2, each of which implements the Filter interface. When a request is made to /filter1, Filter1 is called and prints “Filter 1 is called” to the console. Similarly, when a request is made to /filter2, Filter2 is called and prints “Filter 2 is called” to the console. The web.xml file maps each filter to the corresponding URL pattern.

Further Reading