messagefilter.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.FilterChain;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.ServletException;
public class MessageFilter extends GenericFilter
{
	public void doFilter(final ServletRequest req,final ServletResponse res,FilterChain chain)throws IOException,ServletException
	{
		System.out.println("Entering filter2");
		String message=filterConfig.getInitParameter("message");
		req.setAttribute("message",message);
		chain.doFilter(req,res);
		System.out.println("exiting filter2");
	}
}