checkresponsefilter.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.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.RequestDispatcher;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.*;

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


public class CheckResponseFilter implements Filter{
    
    public void init(final FilterConfig filterConfig) 
    {
    }

    public void destroy()
    {

    }
    
    public CheckResponseFilter() {
   }

    public void doFilter(final ServletRequest request,
			 final ServletResponse response,
			 FilterChain chain) 
	throws java.io.IOException, javax.servlet.ServletException 
    {
	PrintWriter out = response.getWriter();
	chain.doFilter(request, response);
     HttpServletResponse httpresponse = (HttpServletResponse)response;
	out.println("<p><p>");
	out.println(" <FONT COLOR='#009999' SIZE='4' face='Arial'> ");
	out.println(" <STRONG>This table is generated from the CheckResponseFilter</STRONG> ");
	out.println(" </FONT> ");
	out.println(" <HR> ");
	out.println(" <H2></H2> ");
     out.println("<CENTER>");
     out.println ( "<TABLE Border=1 BGCOLOR=WHITE> ");
     out.println("<TR BGCOLOR='#99cee6'> <TH> Parameter</TH> <TH> Value</TH></TR> ");
	out.println("<tr>");
	out.println("<td>Buffer Size</td>");
	out.println("<td>" + httpresponse.getBufferSize()+"</td>");
	out.println("</tr>");
	out.println("<tr>");
	out.println("<td>If Committed</td>");
	out.println("<td>"+ httpresponse.isCommitted()+"</td>");
	out.println("</tr>");
	out.println("</TABLE>");
     out.println("</CENTER>");     
	out.println("</body>");
	out.println("</html>");
    }
}