Source Code : Request header viewer

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Request header viewer

 
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 RequestHeaderView extends HttpServlet {

  public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, java.io.IOException {

    //get an Enumeration of all the request header names
    Enumeration e = request.getHeaderNames();

    //display
    response.setContentType("text/html");
    java.io.PrintWriter out = response.getWriter();
    out.println("<html><head><title>Request Header View</title></head><body>");
    out.println("<h2>Request Headers</h2>");
    String header = null;

    while (e.hasMoreElements()) {
      header = (String) e.nextElement();
      //getHeader returns null if a request header of that name does not
      // exist in the request
      out.println("<strong>" + header + "</strong>" + ": "
          + request.getHeader(header) + "<br>");
    }

    out.println("</body></html>");

  } //end doGet

  public void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, java.io.IOException {
    doGet(request, response);
  }

}

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