helloworldfilter.java

《J2EE企业级应用开发》一书的配套源代码

package com.j2eeapp.filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.ServletException;
public class HelloWorldFilter extends GenericFilter
{
	public void doFilter(final ServletRequest req,final ServletResponse res,FilterChain chain)throws IOException,ServletException
	{
		System.out.println("Enter Filter1");
		System.out.println("Hello,HelloWorld");
		chain.doFilter(req,res);
		System.out.println("Exiting filter1---------");
	}
}