JAVA WEB APPLICATIONS create an empty order form use this code as an example: pa

ID: 3572676 • Letter: J

Question

JAVA WEB APPLICATIONS

create an empty order form

use this code as an example:

package app26b;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Enumeration;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

@WebServlet(name = "FormServlet", urlPatterns = { "/form" }) public class FormServlet extends HttpServlet { private static final long serialVersionUID = 54L;

private static final String TITLE = "Order Form";

@Override public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html");

PrintWriter writer = response.getWriter();

writer.println("<html>");

writer.println("<head>");

writer.println("<title>" + TITLE + "</title></head>");

writer.println("<body><h1>" + TITLE + "</h1>");

writer.println("<form method='post'>");

writer.println("<table>");

writer.println("<tr>");

writer.println("<td>Name:</td>");

writer.println("<td><input name='name'/></td>");

writer.println("</tr>");

writer.println("<tr>");

writer.println("<td>Address:</td>");

writer.println("<td><textarea name='address' " + "cols='40' rows='5'>

writer.println("</tr>");

writer.println("<tr>");

writer.println("<td>Country:</td>");

writer.println("<td><select name='country'>");

writer.println("<option>United States</option>");

writer.println("<option>Canada</option>");

writer.println("</select></td>");

writer.println("</tr>");

writer.println("<tr>");

writer.println("<td>Delivery Method:</td>");

writer.println("<td><input type='radio' " + "name='deliveryMethod'" + " value='First Class'/>First Class");

writer.println("<input type='radio' " + "name='deliveryMethod' "

package

+ "value='Second Class'/>Second Class</td>");

writer.println("</tr>");

writer.println("<tr>");

writer.println("<td>Shipping Instructions:</td>");

writer.println("<td><textarea name='instruction' " + "cols='40' rows='5'>

writer.println("</tr>");

writer.println("<tr>");

writer.println("<td> </td>");

writer.println("<td><textarea name='instruction' " + "cols='40' rows='5'>

writer.println("</tr>");

writer.println("<tr>");

writer.println("<td>Please send me the latest " + "product catalog:</td>");

writer.println("<td><input type='checkbox' " + "name='catalogRequest'/></td>");

writer.println("</tr>");

writer.println("<tr>");

writer.println("<td> </td>");

writer.println("<td><input type='reset'/>" + "<input type='submit'/></td>");

writer.println("</tr>");

writer.println("</table>");

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

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

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

}

@Override public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html");

PrintWriter writer = response.getWriter();

writer.println("<html>");

writer.println("<head>");

writer.println("<title>" + TITLE + "</title></head>");

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

writer.println("<body><h1>" + TITLE + "</h1>");

writer.println("<table>");

writer.println("<tr>");

writer.println("<td>Name:</td>");

writer.println("<td>" + request.getParameter("name") + "</td>");

writer.println("</tr>");

writer.println("<tr>");

writer.println("<td>Address:</td>");

writer.println("<td>" + request.getParameter("address") + "</td>");

writer.println("</tr>");

writer.println("<tr>");

writer.println("<td>Country:</td>");

writer.println("<td>" + request.getParameter("country") + "</td>");

writer.println("</tr>");

writer.println("<tr>");

writer.println("<td>Shipping Instructions:</td>");

writer.println("<td>");

String[] instructions = request .getParameterValues("instruction");

if (instructions != null) { for (String instruction : instructions) { writer.println(instruction + "<br/>");

}

writer.println("</td>");

writer.println("</tr>");

writer.println("<tr>");

writer.println("<td>Delivery Method:</td>");

writer.println("<td>" + request.getParameter("deliveryMethod") + "</td>");

writer.println("</tr>");

writer.println("<tr>");

writer.println("<td>Catalog Request:</td>");

writer.println("<td>");

if (request.getParameter("catalogRequest") == writer.println("No");

} else { writer.println("Yes");

null) { } writer.println("</td>");

writer.println("</tr>");

writer.println("</table>");

writer.println("<div>");

writer.println("Debug Info<br/>");

Enumeration<String> parameterNames = request .getParameterNames();

while (parameterNames.hasMoreElements()) { String paramName = parameterNames.nextElement();

writer.println(paramName + ": ");

String[] paramValues = request .getParameterValues(paramName);

for (String paramValue : paramValues) { writer.println(paramValue + "<br/>");

}

writer.println("</div>");

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

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

}

You invoke the FormServlet using this URL: http://localhost 8080/app26b/form Order Form http:/Ilocalhost.8080/app26bf form C Google Order Form Name: Address: Country: United States Delivery Method: OFirst Class Osecond Class Shipping instructions: Please send me the latest product catalog: B Figure 26.7: The empty order form

Explanation / Answer

Replace your doGet method with this code (comments are included)

protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

String TITLE = "Order Form";//title string varible value assigned

PrintWriter writer = response.getWriter();
writer.println("<html>");

writer.println("<head>");
writer.println("<title>" + TITLE + "</title>");
writer.println("<head>");

writer.println("<body>");

writer.println("<h1>" + TITLE + "</h1>");

writer.println("<form method='post'>");
writer.println("<table>");

writer.println("<tr>");
writer.println("<td>Name:</td>");
writer.println("<td><input typed='text' name='name'/></td>");//input type should be text
writer.println("</tr>");

writer.println("<tr>");
writer.println("<td>Address:</td>");
writer.println("<td><textarea name='address' cols='40' rows='5'></textarea></td>");//havent close the panthesis,also text area is a tag it should be opened and closed
writer.println("</tr>");

writer.println("<tr>");
writer.println("<td>Country:</td>");
writer.println("<td><select name='country'>");
writer.println("<option>United States</option>");
writer.println("<option>Canada</option>");
writer.println("</select></td>");
writer.println("</tr>");

writer.println("<tr>");
writer.println("<td>Delivery Method:</td>");
writer.println("<td><input type='radio' " + "name='deliveryMethod'" + " value='First Class'/>First Class");
writer.println("<input type='radio' " + "name='deliveryMethod'" + " value='Second Class'/>Second Class</td>");
writer.println("</tr>");

writer.println("<tr>");
writer.println("<td>Shipping Instructions:</td>");
writer.println("<td><textarea name='instruction'cols='40' rows='5'></textarea></td>");//td close,text area tag
writer.println("</tr>");

writer.println("<tr>");
writer.println("<td>Please send me the latest " + "product catalog:</td>");
writer.println("<td><input type='checkbox' " + "name='catalogRequest'/></td>");
writer.println("</tr>");

writer.println("<tr>");
writer.println("<td> </td>");
writer.println("<td><input type='reset'/>" + "<input type='submit'/></td>");
writer.println("</tr>");

writer.println("</table>");
writer.println("</form>");

writer.println("</body>");
writer.println("</html>");
}

Replace your doPost method with this

protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

String TITLE = "Order Details";

PrintWriter writer = response.getWriter();
writer.println("<html>");
writer.println("<head>");
writer.println("<title>" + TITLE + "</title></head>");
writer.println("</head>");

writer.println("<body><h1>" + TITLE + "</h1>");

writer.println("<table>");

writer.println("<tr>");
writer.println("<td>Name:</td>");
writer.println("<td>" + request.getParameter("name") + "</td>");
writer.println("</tr>");

writer.println("<tr>");
writer.println("<td>Address:</td>");
writer.println("<td>" + request.getParameter("address") + "</td>");
writer.println("</tr>");

writer.println("<tr>");
writer.println("<td>Country:</td>");
writer.println("<td>" + request.getParameter("country") + "</td>");
writer.println("</tr>");
writer.println("<tr>");
writer.println("<td>Shipping Instructions:</td>");
writer.println("<td>");

String[] instructions = request.getParameterValues("instruction");
if (instructions != null) {
for (String instruction : instructions) {
writer.println(instruction + "<br/>");
}

}
writer.println("</td>");
writer.println("</tr>");

writer.println("<tr>");
writer.println("<td>Delivery Method:</td>");
writer.println("<td>" + request.getParameter("deliveryMethod") + "</td>");
writer.println("</tr>");

writer.println("<tr>");
writer.println("<td>Catalog Request:</td>");
writer.println("<td>");
if (request.getParameter("catalogRequest") == null) {
writer.println("No");
} else {
writer.println("Yes");

}
writer.println("</td>");
writer.println("</tr>");

writer.println("</table>");

writer.println("<div>");
writer.println("Debug Info<br/>");
Enumeration<String> parameterNames = request.getParameterNames();
while (parameterNames.hasMoreElements()) {
String paramName = parameterNames.nextElement();
writer.println(paramName + ": ");
String[] paramValues = request.getParameterValues(paramName);
for (String paramValue : paramValues) {
writer.println(paramValue + "<br/>");
}
}

writer.println("</div>");
writer.println("</body>");
writer.println("</html>");

}

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