Thực hành sử dụng XML trong Java Lab 4

Processing XML Using Java Lab 04 StAX and JAXB Mục tiêu - Sử dụng XMLStreamReader đọc nội dung XML - Sử dụng XMLStreamWriter ghi file XML - Sử dụng XMLEventReader ghi nội dung file XML - Sử dụng JAXB Marshelling chuyển nội dung java object sang file XML - Sử dụng JAXB UnMarsher lấy nội dung file XML vào java object Phần I Bài tập step by step Bài 4.1 Sử dụng XMLStreamReader đọc nội dung file ccinfo.xml:  ccinfo.xml IT Research Department @BKAP 2015 Trang / 19 Architecting Applications for the Web  Output: Step 1: Tạo project java netbean  File  New Project  Java  Java Application  Project Name: Đặt tên Project StAX Step 2: Tạo File ccinfo.xml  Project  New  Other  XML  XML Document  ccinfo.xml XML DATA FOR CREDIT CARD INFORMATION > David McArthur 9921 5681 2521 8845 IT Research Department @BKAP 2015 Trang / 19 Processing XML Using Java CreditBank 06/10 Step 3: Tạo lớp BKXMLStreamReader để đọc in nội dụng file ccinfo.xml  BKXMLStreamReader.java package stax; import java.io.File; import java.io.FileInputStream; import javax.xml.stream.XMLInputFactory; import javax.xml.stream.XMLStreamReader; /** * * @author DELL */ public class BKXMLStreamReader { public static void StreamReader(File file) { try { //create XML Input Factory XMLInputFactory inputFactory = XMLInputFactory.newInstance(); //create XML Stream Reader form XMLInputFactory and source file ccinfo.xml XMLStreamReader streamReader = inputFactory.createXMLStreamReader(new FileInputStream(file)); //Returns type of event an integer while (streamReader.hasNext()) { int eventType = streamReader.getEventType(); //check value of each event type switch (eventType) { //Event - start Element case 1: System.out.println("Event Type - START_ELEMENT(1)"); System.out.println("Start Element Name - " + streamReader.getLocalName()); //Event - end Element case 2: System.out.println("Event Type - END_ELEMENT(2)"); System.out.println("End Element Name - " + streamReader.getLocalName()); break; //Event - Processing Instruction case 3: System.out.println("Event Type – PROCESSING_INSTRUCTION(3)"); System.out.println("Processing Instruction Data - " + streamReader.getPIData()); break; //Event - Character case 4: System.out.println("Event Type - CHARACTERS(4)"); System.out.println("Character Data - " + streamReader.getText()); break; //Event - Comment case 5: System.out.println("Event Type - COMMENT(5)"); System.out.println("Comment Data - " + streamReader.getText()); IT Research Department @BKAP 2015 Trang / 19 Architecting Applications for the Web break; //Event - Space case 6: System.out.println("Event Type - SPACE(6)"); System.out.println("Space Info - " + streamReader.getText()); break; //Event - Start Document case 7: System.out.println("Event Type - START_DOCUMENT(7)"); System.out.println("Character Encoding Scheme - " + streamReader.getCharacterEncodingScheme()); System.out.println("Version - " + streamReader.getVersion()); break; } streamReader.next(); } int eventType = streamReader.getEventType(); //Event - End Document if (eventType == 8) { System.out.println("Event Type - END_DOCUMENT(8) - closing document"); streamReader.close(); } } catch (Exception ex) { ex.printStackTrace(); } } } Step 4: Triển khai hàm main ứng dụng  StAX.java package stax; import java.io.File; /** * * @author DELL */ public class StAX { /** * @param args the command line arguments */ public static void main(String[] args) { try { //Reader File file = new File("ccinfo.xml"); BKXMLStreamReader bSR = new BKXMLStreamReader(); bSR.StreamReader(file); } catch (Exception e) { e.printStackTrace(); } } } IT Research Department @BKAP 2015 Trang / 19 Processing XML Using Java Step 5: Build and Run ứng dụng Bài 4.2 Sử dụng XMLStreamWriter Interface để ghi liệu file output.xml Step 1: Tạo lớp BKXMLStreamWriter để ghi liệu file xml  BKXMLStreamWriter.java IT Research Department @BKAP 2015 Trang / 19 Architecting Applications for the Web package stax; import java.io.File; import java.io.FileWriter; import javax.xml.stream.XMLOutputFactory; import javax.xml.stream.XMLStreamWriter; /** * * @author DELL */ public class BKXMLStreamWriter { public static void StreamWriter(File file) { //create XML Output Factory XMLOutputFactory factory = XMLOutputFactory.newInstance(); try { //create XML Stream Writer form XMLOutputFactory and recorded file xml XMLStreamWriter writer = factory.createXMLStreamWriter(new FileWriter(file)); //Start write Document,Element,Value of Element, Attribute writer.writeStartDocument("1.0"); writer.writeStartElement("Employees"); writer.writeStartElement("employee"); writer.writeAttribute("id", "111"); writer.writeStartElement("firstName"); writer.writeCharacters("John"); writer.writeEndElement(); writer.writeStartElement("lasttName"); writer.writeCharacters("Peter"); writer.writeEndElement(); writer.writeStartElement("location"); writer.writeCharacters("London"); writer.writeEndElement(); writer.writeEndElement(); writer.writeEndDocument(); writer.flush(); writer.close(); } catch (Exception ex) { ex.printStackTrace(); } } } Step 2: Triển khai hàm main ứng dụng package stax; import java.io.File; /** * * @author DELL */ public class StAX { /** * @param args the command line arguments */ IT Research Department @BKAP 2015 Trang / 19 Processing XML Using Java public static void main(String[] args) { try { //Reader File file = new File("ccinfo.xml"); BKXMLStreamReader bSR = new BKXMLStreamReader(); // bSR.StreamReader(file); //writer File fileWriter = new File("output.xml"); BKXMLStreamWriter bSW = new BKXMLStreamWriter(); bSW.StreamWriter(fileWriter); } catch (Exception e) { e.printStackTrace(); } } } Step 3: Build and Run ứng dụng Bài 4.3 Sử dụng XMLEventReader interator để phân tích in nội dung file xml  Employees.xml IT Research Department @BKAP 2015 Trang / 19 Architecting Applications for the Web  Output Step 1: Tạo lớp BKXMLEventReader để phân tích in nội dung Employees.xml  BKXMLEventReader.java package stax; import java.io.Reader; import java.util.Iterator; import javax.xml.namespace.QName; IT Research Department @BKAP 2015 Trang / 19 Processing XML Using Java import javax.xml.stream.XMLEventReader; import javax.xml.stream.XMLInputFactory; import javax.xml.stream.XMLStreamException; import javax.xml.stream.events.Attribute; import javax.xml.stream.events.Characters; import javax.xml.stream.events.EndElement; import javax.xml.stream.events.StartElement; import javax.xml.stream.events.XMLEvent; /** * * @author DELL */ public class BKXMLEventReader { public static void EventReader(Reader fileReader) { //create XML Input Factory XMLInputFactory factory = XMLInputFactory.newInstance(); try { //create XML Event Reader form XMLInputFactory and Reader file XMLEventReader reader = factory.createXMLEventReader(fileReader); //loop EventReader while (reader.hasNext()) { //get XMLEvent XMLEvent event = reader.nextEvent(); //Event is start element if (event.isStartElement()) { StartElement element = (StartElement) event; System.out.println("Start Element: " + element.getName()); Iterator iterator = element.getAttributes(); while (iterator.hasNext()) { Attribute attribute = (Attribute) iterator.next(); QName name = attribute.getName(); String value = attribute.getValue(); System.out.println("Attribute name/value: " + name + "/" + value); } } //Event is end element if (event.isEndElement()) { EndElement element = (EndElement) event; System.out.println("End element:" + element.getName()); } //Event is character if (event.isCharacters()) { Characters characters = (Characters) event; System.out.println("Text: " + characters.getData()); } } } catch (XMLStreamException ex) { ex.printStackTrace(); } } } IT Research Department @BKAP 2015 Trang / 19 Architecting Applications for the Web  Cấu trúc project sau hoàn thành Step 2: Triển khai hàm main ứng dụng package stax; import java.io.File; import java.io.FileReader; import java.io.Reader; /** * * @author DELL */ public class StAX { /** * @param args the command line arguments */ public static void main(String[] args) { try { //Reader File file = new File("ccinfo.xml"); BKXMLStreamReader bSR = new BKXMLStreamReader(); // bSR.StreamReader(file); //writer File fileWriter = new File("output.xml"); BKXMLStreamWriter bSW = new BKXMLStreamWriter(); // bSW.StreamWriter(fileWriter); //EventReader Reader fileReader = new FileReader(new File("Employees.xml")); BKXMLEventReader bER = new BKXMLEventReader(); bER.EventReader(fileReader); } catch (Exception e) { e.printStackTrace(); } } } Step 3: Build and Run ứng dụng IT Research Department @BKAP 2015 Trang 10 / 19 Processing XML Using Java Bài 4.4 Sử dụng JAXB để chuyển java object thành file xml IT Research Department @BKAP 2015 Trang 11 / 19 Architecting Applications for the Web Step 1: Tạo project java netbean  File  New Project  Java  Java Application  Project Name: Đặt tên Project JAXB Step 2: Tạo java object JAXBEmployee sử dụng để tạo file xml  JAXBEmployee.java package jaxb; import javax.xml.bind.annotation.XmlAccessType; import javax.xml.bind.annotation.XmlAccessorType; import javax.xml.bind.annotation.XmlRootElement; /** * * @author DELL */ @XmlRootElement(name="employee") @XmlAccessorType(XmlAccessType.FIELD) public class JAXBEmployee { private Integer id; private String firstName; private String lastName; private double income; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getFirstName() { return firstName; } public void setFirstName(String firstName) { this.firstName = firstName; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } public double getIncome() { return income; } IT Research Department @BKAP 2015 Trang 12 / 19 Processing XML Using Java public void setIncome(double income) { this.income = income; } } Step 3: Tạo java object Map  EmployeeMap.java package jaxb; import java.util.HashMap; import java.util.Map; import javax.xml.bind.annotation.XmlAccessType; import javax.xml.bind.annotation.XmlAccessorType; import javax.xml.bind.annotation.XmlRootElement; /** * * @author DELL */ @XmlRootElement(name="employees") @XmlAccessorType(XmlAccessType.FIELD) public class EmployeeMap { private Map employeeMap = new HashMap(); public Map getEmployeeMap() { return employeeMap; } public void setEmployeeMap(Map employeeMap) { this.employeeMap = employeeMap; } } Step 4: Triển khai hàm main ứng dụng để tạo file JAXBMarshalOutput.xml từ JAXBEmployee EmployeeMap package jaxb; import java.io.File; import java.util.HashMap; import javax.xml.bind.JAXBContext; import javax.xml.bind.JAXBException; import javax.xml.bind.Marshaller; /** * * @author DELL */ public class JAXB { /** IT Research Department @BKAP 2015 Trang 13 / 19 Architecting Applications for the Web * @param args the command line arguments */ public static void main(String[] args) { //create HashMap HashMap map = new HashMap(); //create object JAXBEmployee emp1 JAXBEmployee emp1 = new JAXBEmployee(); //Set value to object emp1 emp1.setId(1); emp1.setFirstName("Allen"); emp1.setLastName("Smith"); emp1.setIncome(100.0); //create object JAXBEmployee emp2 JAXBEmployee emp2 = new JAXBEmployee(); //Set value to object emp2 emp2.setId(2); emp2.setFirstName("John"); emp2.setLastName("Mclane"); emp2.setIncome(200.0); map.put(1, emp1); map.put(2, emp2); //add employee in map EmployeeMap employeeMap = new EmployeeMap(); employeeMap.setEmployeeMap(map); try { //create JAXB context and instantiate marshaller JAXBContext jaxbContext = JAXBContext.newInstance(EmployeeMap.class); Marshaller jaxbMarshaller = jaxbContext.createMarshaller(); jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); //write to System.out jaxbMarshaller.marshal(employeeMap, System.out); //write to File JAXBMarshalOutput.xml jaxbMarshaller.marshal(employeeMap, new File("JAXBMarshalOutput.xml")); } catch (JAXBException ex) { ex.printStackTrace(); } } } Step 5: Build and Run ứng dụng IT Research Department @BKAP 2015 Trang 14 / 19 Processing XML Using Java IT Research Department @BKAP 2015 Trang 15 / 19 Architecting Applications for the Web Bài 4.5 Sử dụng JAXB lấy liệu từ file xml đẩy vào java object in hình  Employees.xml  Output: IT Research Department @BKAP 2015 Trang 16 / 19 Processing XML Using Java Step 1: Tạo object Employee để lấy liệu element employee file xml  Employee.java package jaxb; import javax.xml.bind.annotation.XmlAttribute; import javax.xml.bind.annotation.XmlElement; /** * * @author DELL */ public class Employee { private int id; private String firstName; private String lastName; private String location; public Employee(){} public Employee(int id, String firstName, String lastName,String location){ super(); this.id = id; this.firstName = firstName; this.lastName = lastName; this.location = location; } //getter and setter Attribute id @XmlAttribute public int getId() { return id; } public void setId(int id) { this.id = id; } //getter and setter element firstname @XmlElement public String getFirstName() { return firstName; } public void setFirstName(String firstName) { this.firstName = firstName; } //getter and setter element lastname @XmlElement public String getLastName() { IT Research Department @BKAP 2015 Trang 17 / 19 Architecting Applications for the Web return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } //getter and setter element location @XmlElement public String getLocation() { return location; } public void setLocation(String location) { this.location = location; } } Step 2: Tạo List chứa object employee  Employees.java package jaxb; import java.util.List; import javax.xml.bind.annotation.XmlElement; import javax.xml.bind.annotation.XmlRootElement; /** * * @author DELL */ @XmlRootElement(name = "employees") public class Employees { private List employees; public Employees(){} public Employees(List employees){ super(); this.employees=employees; } @XmlElement(name = "employee") public List getEmployees() { return employees; } public void setEmployees(List employees) { this.employees = employees; } } Step 3: Triển khai hàm main ứng dụng để lấy liệu từ file xml vào java object package jaxb; import java.io.File; import java.util.List; import javax.xml.bind.JAXBContext; import javax.xml.bind.JAXBException; IT Research Department @BKAP 2015 Trang 18 / 19 Processing XML Using Java import javax.xml.bind.Unmarshaller; /** * * @author DELL */ public class JAXB { /** * @param args the command line arguments */ public static void main(String[] args) { //Create File form Employees.xml File file = new File("Employees.xml"); try { //Create JAXB Context JAXBContext jaxbContext = JAXBContext.newInstance(Employees.class); //Create Unmarshaller Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller(); //Get List Employees form Unmarshaller and file Employees emp = (Employees) jaxbUnmarshaller.unmarshal(file); System.out.println("employees:"); List listemp = emp.getEmployees(); //Print each employee in list Employees for (Employee empl : listemp) { System.out.println(empl.getId() + " " + empl.getFirstName() + " " + empl.getLastName() + " " + empl.getLocation()); } } catch (JAXBException ex) { ex.printStackTrace(); } } } Step 4: Build and Run ứng dụng IT Research Department @BKAP 2015 Trang 19 / 19 ... Using Java Step 5: Build and Run ứng dụng Bài 4. 2 Sử dụng XMLStreamWriter Interface để ghi liệu file output .xml Step 1: Tạo lớp BKXMLStreamWriter để ghi liệu file xml  BKXMLStreamWriter .java. .. javax .xml. stream.XMLEventReader; import javax .xml. stream.XMLInputFactory; import javax .xml. stream.XMLStreamException; import javax .xml. stream.events.Attribute; import javax .xml. stream.events.Characters;... Processing XML Using Java Bài 4. 4 Sử dụng JAXB để chuyển java object thành file xml IT Research Department @BKAP 2015 Trang 11 / 19 Architecting Applications for the Web Step 1: Tạo project java netbean