Hướng dẫn và ví dụ Java JAXB

package org.o7planning.tutorial.jaxb.model;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "employee")
@XmlAccessorType(XmlAccessType.FIELD)
public class Employee {

   private String empNo;
   private String empName;
   private String managerNo;

   /**
    * Cấu tử mặc định này là bắt buộc nếu có thêm cấu tử khác.
    */
   public Employee() {

   }

   public Employee(String empNo, String empName, String managerNo) {
       this.empNo = empNo;
       this.empName = empName;
       this.managerNo = managerNo;
   }

   public String getEmpNo() {
       return empNo;
   }

   public void setEmpNo(String empNo) {
       this.empNo = empNo;
   }

   public String getEmpName() {
       return empName;
   }

   public void setEmpName(String empName) {
       this.empName = empName;
   }

   public String getManagerNo() {
       return managerNo;
   }

   public void setManager(String managerNo) {
       this.managerNo = managerNo;
   }

}

package org.o7planning.tutorial.jaxb.model;

import java.util.List;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(namespace = "http://o7planning.org/jaxb")
@XmlAccessorType(XmlAccessType.FIELD)
public class Department {

 private String deptNo;
 private String deptName;
 private String location;

 @XmlElementWrapper(name = "employees")
 @XmlElement(name = "employee")
 private List<Employee> employees;

 /**
  *  Cấu tử mặc định này là bắt buộc nếu có thêm cấu tử khác.
  */
 public Department() {

 }

 public Department(String deptNo, String deptName, String location) {
     this.deptNo = deptNo;
     this.deptName = deptName;
 }

 public String getDeptNo() {
     return deptNo;
 }

 public void setDeptNo(String deptNo) {
     this.deptNo = deptNo;
 }

 public String getDeptName() {
     return deptName;
 }

 public void setDeptName(String deptName) {
     this.deptName = deptName;
 }

 public String getLocation() {
     return location;
 }

 public void setLocation(String location) {
     this.location = location;
 }

 public List<Employee> getEmployees() {
     return employees;
 }

 public void setEmployees(List<Employee> employees) {
     this.employees = employees;
 }

}

package org.o7planning.tutorial.jaxb.test;

import java.io.File;
import java.io.FileReader;
import java.util.ArrayList;
import java.util.List;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;

import org.o7planning.tutorial.jaxb.model.Department;
import org.o7planning.tutorial.jaxb.model.Employee;

public class TestExample {

   private static final String XML_FILE = "dept-info.xml";

   public static void main(String[] args) {

       Employee emp1 = new Employee("E01", "Tom", null);
       Employee emp2 = new Employee("E02", "Mary", "E01");
       Employee emp3 = new Employee("E03", "John", null);

       List<Employee> list = new ArrayList<Employee>();
       list.add(emp1);
       list.add(emp2);
       list.add(emp3);

       Department dept = new Department("D01", "ACCOUNTING", "NEW YORK");
       //
       dept.setEmployees(list);

       try {
           // Tạo đối tượng JAXB context.
           JAXBContext context = JAXBContext.newInstance(Department.class);

           // (1) Marshaller : Chuyển đối tượng Java thành XML
           Marshaller m = context.createMarshaller();
           m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);

           // Ghi đối tượng java (dept) ra màn hình Console (System.out)
           m.marshal(dept, System.out);

           // Ghi đối tượng Java (dept) ra file.
           File outFile = new File(XML_FILE);
           m.marshal(dept, outFile);

           System.err.println("Write to file: " + outFile.getAbsolutePath());

           // (2) Unmarshaller : Chuyển dữ liệu XML thành đối tượng Java.
           Unmarshaller um = context.createUnmarshaller();

           // Phân tích file XML vừa được tạo ra ở bước trước.
           Department deptFromFile = (Department) um.unmarshal(new FileReader(
                   XML_FILE));
           List<Employee> emps = deptFromFile.getEmployees();
           for (Employee emp : emps) {
               System.out.println("Employee: " + emp.getEmpName());
           }

       } catch (Exception e) {
           e.printStackTrace();
       }
   }
}