import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
/**
* Servlet that prints the value of a parameter,
* optionally in color.
*/
public class PrintThis extends HttpServlet
{
/**
* Respond to any HTTP GET request with an
* page displaying the value of the "arg"
* parameter.
*/
public void doGet (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException
{
// Set the HTTP content type in response header.
response.setContentType("text/html; charset=\"UTF-8\"");
// Obtain a PrintWriter object for creating the body
// of the response
PrintWriter servletOut = response.getWriter();
// Create the first part of the body of the response
servletOut.println(
" \n" +
" \n" +
" \n" +
" \n" +
" PrintThis.java \n" +
" \n" +
" \n" +
" \n" +
" Query string: " +
WebTechUtil.escapeXML(request.getQueryString()) + "
" );
// Decide whether or not to set color
String color = request.getParameter("color");
if (color == null) {
servletOut.println(
" " );
} else {
servletOut.println(
"
" );
}
// Decide which string to output
String arg = request.getParameter("arg");
if (arg == null) {
arg = "Hello World!";
}
// Create remainder of response body
servletOut.println(
" " + WebTechUtil.escapeXML(arg) + "\n" +
"
\n" +
" \n" +
" ");
servletOut.close();
}
}