📄 headersservlet.java
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package jwadbook.servlets;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.Enumeration;
public class HeadersServlet extends HttpServlet
{
public void doPost ( HttpServletRequest req, HttpServletResponse resp )
throws ServletException,IOException
{
Enumeration params = req.getParameterNames();
PrintWriter out = resp.getWriter();
resp.setContentType("text/html");
out.println(" <HTML> ");
out.println(" <HEAD>");
out.println(" <TITLE>FormParameterServlet</TITLE> ");
out.println(" </HEAD> ");
out.println(" <BODY BGCOLOR=white> ");
out.println(" <CENTER> ");
out.println(" <FONT COLOR='#009999' SIZE='4' face='Arial'> ");
out.println(" <STRONG>List of all Headers in Servlet Request</STRONG> ");
out.println(" </FONT> ");
out.println(" </CENTER> ");
out.println(" <HR> ");
out.println("<H3> Request Line is: </H3>");
out.println("<B>Method: </B>" + req.getMethod() + " + ");
out.println("<B>URI: </B>" + req.getRequestURI() + " + ");
out.println("<B>Protocol: </B>" + req.getProtocol() + "<BR>" );
out.println("<CENTER><H3> Header Name and Values </H3></CENTER>");
out.println("<TABLE BORDER=1 ALIGN=CENTER >");
out.println("<TR BGCOLOR='#99cee6'> <TH> Name</TH> <TH>Value </TH> </TR> ");
Enumeration headerNames = req.getHeaderNames();
while(headerNames.hasMoreElements()) {
String headerName = (String)headerNames.nextElement();
out.println("<TR><TD>" + headerName + "</TD>");
out.println(" <TD>" + req.getHeader(headerName)+"</TD>");
}
out.println("</TABLE>");
out.println("</BODY></HTML>");
out.flush();
}
public void doGet ( HttpServletRequest req, HttpServletResponse resp )
throws ServletException,IOException
{
doPost(req,resp);
}
}
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