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RequestDispatcher in JSP – EEMag Sample

RequestDispatcher in JSP – EEMag Sample. Employee Management Version 0.1. Objectives. Using RequestDispatcher in JSP <jsp:forward page=“…"/> Get parameters of the form in JSP request.getParameter("List"). Home page – menu.jsp. Go to Add page. Go to List page. List page – list.jsp.

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RequestDispatcher in JSP – EEMag Sample

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  1. RequestDispatcher in JSP – EEMag Sample Employee Management Version 0.1

  2. Objectives • Using RequestDispatcher in JSP • <jsp:forward page=“…"/> • Get parameters of the form in JSP • request.getParameter("List")

  3. Home page – menu.jsp Go to Add page Go to List page

  4. List page – list.jsp

  5. Add page – add.jsp

  6. View page – view.jsp

  7. Source code: menu.jsp <html> <body> <form action="process.jsp"> <input type="Submit" name="List" value="List"> &nbsp;&nbsp; <input type="Submit" name="Add" value="Add"> &nbsp;&nbsp; </form> </body> </html>

  8. Source code: process.jsp <%! String nextPage; %> <% if (request.getParameter("List") != null) { System.out.println("Clicked List button"); nextPage = "list.jsp"; } else if (request.getParameter("Add") != null ) { System.out.println("Clicked List button"); nextPage = "add.jsp"; } %> <jsp:forward page="<%= nextPage %>"/>

  9. Source code: list.jsp <html> <body> <a href="menu.jsp">Go to Menu</a> <br/> <h1>Listing Employes:</h1> <table border="1" cellspacing="0"> <tr> <th>Full name</th> <th>Sex</th> <th>Adress</th> </tr> <tr> <td>NNNN</td> <td>NNNN</td> <td>NNNN</td> </tr> </table> </body> </html>

  10. Source code: add.jsp (1) <html> <body> <a href="menu.jsp">Go to Menu</a> <form action="add.jsp"> Name*:&nbsp;&nbsp;<input type="input" name="fullName" value=""> <br/> Sex:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<select name="sex"> <option></option> <option name="male">Male</option> <option name="female">Female</option> </select> <br/> Address:<textarea name="address" cols="10" rows="3"></textarea> <br/><br/> <input type="Submit" name="Create" value="Create"> </form> </body>

  11. Source code: add.jsp (2) <%! boolean createSuccess; %> <% // Clicked on Add button createSuccess = false; if ((request.getParameter("Create") != null) && (!"".equals(request.getParameter("fullName")))) { String fullName = request.getParameter("fullName"); String sex = request.getParameter("sex"); String address = request.getParameter("address"); // Logging for debug System.out.println("eemag.add: fullName = " + fullName); System.out.println("eemag.add: sex = " + sex); System.out.println("eemag.add: address = " + address); createSuccess = true; } %> <% if (createSuccess) { %> <%-- Forward to the view page --%> <jsp:forward page="view.jsp"/> <% } %> </html>

  12. Web Application Descriptor – web.xml <?xml version="1.0"?> <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd"> <web-app> <display-name>Employee Management</display-name> <welcome-file-list> <welcome-file>menu.jsp</welcome-file> </welcome-file-list> </web-app>

  13. Pack the web application into war file • Open the window command line by going to menu Start | Run. Then execute “cmd” comand. • Change the working directory into the folder that contains the web application • Execute the comand: jar -cvf eemag01.war . (Note: run “jar” without any argument to view helps)

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