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XML, Uploading, Importing... Joshua Scotton. <% //HTTP 1.1 response.setHeader("Cache-Control","no-store"); //HTTP 1.0 response.setHeader("Pragma","no-cache");

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1 XML, Uploading, Importing... Joshua Scotton

2 <% //HTTP 1.1 response.setHeader("Cache-Control","no-store"); //HTTP 1.0 response.setHeader("Pragma","no-cache"); //Stops any problems from proxy servers response.setDateHeader ("Expires", 0); %>

3  Simplest way is to construct a string: String s = “\n” + “ \n” + “...\n” + “ \n” + “ ”;

4  Have to handle special characters ◦ <br/>  No validation so easy to make mistakes

5  Java API for XML Processing  Provides validation, parsing and generation functionality for XML

6  DOM - Document Object Model (JDK5+)  SAX - Simple API for XML (JDK5+)  StAX - Streaming API for XML (JDK6+)

7  The DOM Parser models the entire XML document in memory  Uses the org.w3c.dom.Document model  Tree Nodes ◦ Element ◦ Attr ◦ Text

8 GenerateDOM.class

9 ReadDOM.class

10 ModifyDOM.class

11  DOM should be avoided for large files as the entire XML file is modelled as a Document in memory, including all Nodes, Elements, Attributes etc.

12  Faster at reading XML content than DOM.  Stream implementation instead of Document Model  Callback handler object has to be created

13  Following methods can be overwritten in the Handler class: ◦ startDocument() and endDocument() – methods called at the start and end of an XML document. ◦ startElement() and endElement() – methods called at the start and end of a document element. ◦ characters() – method called with the text contents in between the start and end tags of an XML document element.

14 ReadSAX.class

15

16  Upload and import XML test files  Store tests, results and users in database  User login and registration  Users can take tests and view results

17  Test ◦ TestQuestion  TestAnswer  Result ◦ ResultQuestion

18

19 Example Quiz Quick Quiz on Java XML Parsers Which of the following is not a built-in Java parser? JDOM DOM SAX DOM loads the entire XML into memory. True or false? True False

20 public class TestBean implements Serializable { private String title; private String description; private List questions; public String getTitle() { return title; } public void setTitle(String title) { this.title = title; } public String getDescription() { return description; } public void setDescription(String description) { this.description = description; } public List getQuestions() { return questions; } public void setQuestions(List questions) { this.questions = questions; } public void addQuestion(TestQuestionBean question) { this.questions.add(question); } }

21 public class TestQuestionBean implements Serializable { private String text; private String id; private List answers; public String getText() { return text; } public void setText(String text) { this.text = text; } public List getAnswers() { return answers; } public void setAnswers(List answers) { this.answers = answers; } public void addAnswer(TestAnswerBean answer) { this.answers.add(answer); } }

22 public class TestAnswerBean implements Serializable { private String text; private String id; private Integer score; public String getText() { return text; } public void setText(String text) { this.text = text; } public Integer getScore() { return score; } public void setScore(Integer score) { this.score = score; }

23 ImportTest.class

24  Select file (uploadForm.jsp)  Load into UploadBean (importUpload.jsp)  UploadBean -> ImportTest  ImportTest creates TestBean  TestBean stored in Session  Success Message (importUpload.jsp)  Display Test (viewTest.jsp)  index?action=“upload|import|view”

25 File Path:

26 View Test

27 UploadBean.class

28 <% int i=0; for(TestQuestionBean q : test.getQuestions()){ i++; out.println(" Question " + i + ": " + q.getText()+" "); for(TestAnswerBean a : q.getAnswers()){ out.println(" " + a.getText() + " "); } out.println(" "); } %>

29

30  connectionName  connectionPassword  connectionURL  driverName  roleNameCol  userCredCol  userNameCol  userRoleTable  userTable

31 CREATE TABLE `QuizMaster`.`user` (`username` TEXT NOT NULL, `password` TEXT NOT NULL ) ENGINE = InnoDB; CREATE TABLE `QuizMaster`.`role` (`username` TEXT NOT NULL, `role` TEXT NOT NULL ) ENGINE = InnoDB;

32  Will need to install the MySQL driver from in the tomcat/lib folder

33  admin:admin  guest:guest

34  admin  User


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