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);

  }
}

Related examples in the same category

1.	Simple servlet: Copyright
2.	Print various CGI variables that have been requested by the servlet
3.	Request header viewer
4.	Request binder
5.	Request display
6.	Servlet Request Listener
7.	Client auto refresh
8.	Get Request Parameters in a Servlet

Print all header information available from the client : Do Get Do Post « Servlets « Java

Related examples in the same category