Assignments All about Servlets Servlet Exercise 1

Transcription

1 Page1 Servlet Exercise 1 DVD Library Application Task 1: Developing the Model -View Servlets to perform the following: Fig 1.1: Use case Diagram for DVD Library Application 1.1 Subtask 1: Create DVD Home Page Fig 1.2: Home page for DVD Library Application Location=web pages and name=index.html

2 Page2 1.2 Subtask 2: Create the DVDItem model File: ( DVDItem.java file ) Title: Year: String String Genre: String <<access>>getyear(), gettitle(), getgenre() 1.3 Subtask 3: Create the ListLibraryservlet Servlet Class: ( ListLibraryservlet.java ) Complete the following steps: 1) Create a Java Servlet with the following characteristics: ClassName: ListLibraryServlet Project: DVDLibraryLocation Servlet Name: ListLibraryServlet 2) Import the following classes in the ListLibraryServlet class: java.util.list java.util.lterator java.util.arraylist Hint: 3) Within the processrequest method, create a collection of DVD Item objects, each one representing a DVD in the user's DVD collection. (See hint) List dvds=new ArrayList(); dvds.add( new DVDItem ("Mary Kom","2014","Action Movie")); // add at least 5 records Iterator it=dvds.iterator(); out.println("<table><tr><th>title</th>"+" "+"<th>year</th>"+" "+"<th>genre</th></tr>"); while(it.hasnext()){ DVDItem item=(dvditem) it.next(); out.print("<tr><th>"); out.print(" "+item.gettitle()+" "); out.print("</th>");

3 Page3 // continue the above print statements to generate the HTML response showing all the DVD // records. The output of the response should be same as shown below : Fig 1.3: Web Page for ListLibraryServlet 1.4 Subtask 4: Deploy DVD Library Application, coded till now. It should display all the DVD records hard coded in the ArrayList.

4 Page4 1.5 Subtask 5: Design web page for Adding DVD record Steps : I. Create web page adddvd.html II. Create 3 textboxes and 1 button Fig 1.4: Web page for adding data to DVD Library Application 1.6 Subtask 6: Create Add_dvd servlet for adding data Steps: I. Using getparameter() take values from user.(check values should not be null) II. Make Object of HttpSession. III. Use setattribute to send parameter to ListLibraryServlet. Actually setattribute set value to HttpSession. IV. Use RequestDispatcher to dispatch the request to ListLibraryServlet.

5 Page5 Null value Fig 1.5: Error page after entering null values Fig 1.6 Web Page for ListLibraryServlet ( Displaying all Records, including currently added )

6 Page6 Task 1: Developing the View Servlet Servlet Exercise 2 DVD Library Application with Database readhtml <<View>> writehtml <<View>> READ <<CONTROLLER>> WRITE <<CONTROLLER> DVDLibraryDAO <<MODEL>> ORACLE DB Fig 1.1: Diagram for DVD Library Application with database 2.1 Subtask : Create DVD Library Home Page Fig 2.2: Diagram for DVD Library Application Home page

7 Page7 Create two options First option is for displaying DVD Library Second for Adding DVD list 2.2 Subtask : Create the DVDItem model File: Title: String Year: String Genre: String <<access>>getyear(), gettitle(), getgenre() 2.3 Subtask : Create DVDLibraryDAO.java Create 2 static methods One for reading the list of DVD One for writing the list of DVD I. public static Boolean AddDVD(String arg0,string arg1,string arg3){ // jdbc code for DB connectivity // code to Insert a DVD record II. public static ArrayList<String> Record(){ // jdbc code for DB connectivity // code to select all DVD records 2.4 Subtask : Create adddvd.html Fig 2.3: Diagram for adddvd.html 2.5 Subtask : Create DVDLibrary.java

8 Page8 This would be called form HTML file ( adddvd.html ). Here we would fetch all HTML parameters and call the static method AddDVD(), like this DVDLibraryDAO.AddDVD(Title, Year, Genre) 2.6 Subtask : Create ReadLibraryservlet.java This would be called from HTML file ( Index.html ). Call the static method Record(), like this DVDLibraryDAO.Record() This method will return list. Now create ArrayList to generate dynamic webpage Use Iterator for reading. 2.7 Subtask : Run and deploy project check if error occur

9 Page9 Servlet Exercise 3 DVD Library Application using Dynamic form Additions / Enhancements to the Servlet Exercise Create adddvd.html, with a drop down list like this : Create dropdown List for Selecting Genre Hint: Musical Genre: <select name="item"> <option value="choose">choose</option> <option value="music">musical</option> <option value="drama">drama</option> <option value="movie">romantic Movie</option> <option value="movie">action Movie</option> <option value="short film">short film</option></select> Fig 3.1: Diagram for adddvd.html

10 Page Additions / Enhancements to adddvdlibrary.java Add code for getting data from dropdown list if(request.getparameter("item")!=null) // i.e. the HTML element exists selecteditem=request.getparameter("item"); // fetch Item Title=request.getParameter("Title"); // fetch all other Data Elements Year=request.getParameter("Year"); Genre=request.getParameter("Genre"); if(selecteditem.equals("choose")){ // i.e. the User has not selected if(dvdlibrarydao.adddvd(title, Year,Genre)==true){ out.print("successfully done!!!"); else out.print("fail to update"); else{ if(dvdlibrarydao.adddvd(title, Year, selecteditem)==true){ // i.e. Fetch Data entered by the user out.print("successfully done!!!"); else out.print("fail to update");