/*
* <servlet> <servlet-name>PrintHeader </servlet-name>
* <servlet-class>PrintHeader </servlet-class> </servlet>
*
* <servlet-mapping> <servlet-name>PrintHeader </servlet-name>
* <url-pattern>/PrintHeader </url-pattern> </servlet-mapping>
*
*
*/
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class PrintHeader extends HttpServlet {
/**
* doGet implementation, calls printHeader function
*
* @param request
* @param response
* @throws IOException
* @throws ServletException
*
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
printHeader(request, response);
}
/**
* doPost implementation, calls printHeader function
*
* @param request
* @param response
* @throws IOException
* @throws ServletException
*
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
printHeader(request, response);
}
/**
* Prints client header information that is available
*
* @param request
* @param response
* @throws IOException
* @throws ServletException
*
*/
public void printHeader(HttpServletRequest request,
HttpServletResponse response) throws IOException, ServletException {
String headers = null;
String htmlHeader = "<HTML><HEAD><TITLE> Request Headers</TITLE></HEAD><BODY>";
String htmlFooter = "</BODY></HTML>";
response.setContentType("text/html");
PrintWriter out = response.getWriter();
Enumeration e = request.getHeaderNames();
out.println(htmlHeader);
out.println("<TABLE ALIGN=CENTER BORDER=1>");
out.println("<tr><th> Header </th><th> Value </th>");
while (e.hasMoreElements()) {
headers = (String) e.nextElement();
if (headers != null) {
out.println("<tr><td align=center><b>" + headers + "</td>");
out.println("<td align=center>" + request.getHeader(headers)
+ "</td></tr>");
}
}
out.println("</TABLE><BR>");
out.println(htmlFooter);
}
}
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