Source Code : Print all header information available from the client

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Print all header information available from the client

 
/*
 * <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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