Source Code for Request Parameter Example－簡單看的清楚比較重要

import java.io.*;

import java.util.*;

import javax.servlet.*;

import javax.servlet.http.*;



public class RequestParamExample extends HttpServlet {



    public void doGet(HttpServletRequest request, HttpServletResponse response)

    throws IOException, ServletException

    {

        response.setContentType("text/html");

        PrintWriter out = response.getWriter();

        out.println("<html>");

        out.println("<head>");

        out.println("<title>Request Parameters Example</title>");

        out.println("</head>");

        out.println("<body>");

        out.println("<h3>Request Parameters Example</h3>");

        out.println("Parameters in this request:<br>");

        if (firstName != null || lastName != null) {

            out.println("First Name:");

            out.println(" = " + HTMLFilter.filter(firstName) + "<br>");

            out.println("Last Name:");

            out.println(" = " + HTMLFilter.filter(lastName));

        } else {

            out.println("No Parameters, Please enter some");

        }

        out.println("<P>");

        out.print("<form action=\"");

        out.print("RequestParamExample\" ");

        out.println("method=POST>");

        out.println("First Name:");

        out.println("<input type=text size=20 name=firstname>");

        out.println("<br>");

        out.println("Last Name:");

        out.println("<input type=text size=20 name=lastname>");

        out.println("<br>");

        out.println("<input type=submit>");

        out.println("</form>");

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

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

    }



    public void doPost(HttpServletRequest request, HttpServletResponse res)

    throws IOException, ServletException

    {

        doGet(request, response);

    }

}