Hello, I m new to servlets. I have written a servlet program which reads http header of local host! How to read http header of any website say www.google.com?
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package Header;
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;
/**
*
* @author Andy
*/
public class HeaderServlet extends HttpServlet {
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
//TODO output your page here
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet HeaderServlet</title>");
out.println("</head>");
out.println("<body>");
out.println("<table>");
out.println("<h2>Request Details<h2>");
out.println("<h5><tr><td>Content Type: </h5>"+request.getContentType());
out.println("<h5><tr><td>Local Name: </h5>"+request.getLocalName());
out.println("<h5><tr><td>Request URI: </h5>"+request.getRequestURI());
out.println("<h5><tr><td>Local Port: </h5>"+request.getLocalPort());
out.println("<h5><tr><td>Session Type: </h5>"+request.getSession());
out.println("<h5><tr><td>Path Info: </h5>"+request.getPathInfo());
out.println("<h5><tr><td>Request URL: </h5>"+request.getRequestURL());
out.println("<h5><tr><td>Content Type: </h5>"+request.getContentType());
out.println("<h1>Servlet HeaderServlet at " + request.getContextPath () + "</h1>");
Enumeration headerNames = request.getHeaderNames();
while(headerNames.hasMoreElements()) {
String headerName = (String)headerNames.nextElement();
out.println("<TR><TD>" + headerName);
out.println(" <TD>" + request.getHeader(headerName));
} //out.println("<TR><TD>" + headerName);
// out.println("<TD>" + request.getHeader());
out.println("</table>");
out.println("</body>");
out.println("</html>");
} finally {
out.close();
}
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP <code>POST</code> method.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}
