simplefilter.java

icsamples目录中有icsamples网络程序。 这个程序包括J2EE网络层的范例程序

package jwadbook.filter;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import java.io.*;


/**
 *
 * @author Jian (James) Cai
 */


public class SimpleFilter implements Filter{

    /** Creates new GenericFilter */
    public void init(final FilterConfig filterConfig) 
    {

    }

    public void destroy()
    {

    }    
    
    public SimpleFilter() {
    }

    public void doFilter(final ServletRequest request,final ServletResponse response,FilterChain chain) throws java.io.IOException, javax.servlet.ServletException 
    {
	PrintWriter out = response.getWriter();   
	request.setAttribute("Name", "SimpleFilter");
	chain.doFilter(request, response);
     out.println("Inside Simple Filter");          
    }
}