Java&Xml tutorial (8) Convert Java objects to XML using JDOM-XML/RSS Tutorial-php.cn

In the previous tutorial, we learned how to use JDOM to parse and modify the content of XML files. This section describes how to convert Java objects into XML data and generate files.

JDOM’s Document class provides convenient methods to create elements and attributes. The XMLOutputter class can write Document to any OutputStream and Writer object.
In this example we create a collection of Employee objects and write it to an XML file.
Employee.java

package com.journaldev.xml;
public class Employee {    
private int id;    
private String name;    
private String gender;    
private int age;    
private String role;    
public Employee(){}    
public Employee(int id, String name, int age, String gender, String role){        
this.id=id;        
this.age=age;        
this.name=name;        
this.gender=gender;        
this.role=role;
    }    public int getId() {        
    return id;
    }    public void setId(int id) {        
    this.id = id;
    }    public String getName() {        
    return name;
    }    public void setName(String name) {        
    this.name = name;
    }    public String getGender() {        
    return gender;
    }    public void setGender(String gender) {        
    this.gender = gender;
    }    public int getAge() {        
    return age;
    }    public void setAge(int age) {        
    this.age = age;
    }    public String getRole() {        
    return role;
    }    public void setRole(String role) {        
    this.role = role;
    }

}

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We use the Employee object id as an attribute of the Employee element in the XML file, and set the namespace of the root element Employees to "http://www.php.cn/"
JDOMXMLWriter.java

package com.journaldev.xml.jdom;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.jdom2.Document;
import org.jdom2.Element;
import org.jdom2.Namespace;
import org.jdom2.output.Format;
import org.jdom2.output.XMLOutputter;
import com.journaldev.xml.Employee;
public class JDOMXMLWriter {

    public static void main(String[] args) throws IOException {
        List<Employee> empList = new ArrayList<>();
        empList.add(new Employee(1, "Pankaj",25,"Male","Java Developer"));
        empList.add(new Employee(2, "Mona",34,"Female","Manager"));
        empList.add(new Employee(3, "Dave",45,"Male","Support"));

        String fileName = "employees.xml";
        writeFileUsingJDOM(empList, fileName);
    }

    private static void writeFileUsingJDOM(List<Employee> empList, String fileName) throws IOException {
        Document doc = new Document();
        doc.setRootElement(new Element("Employees",  Namespace.getNamespace("http://www.journaldev.com/employees")));
        for(Employee emp : empList){
            Element employee = new Element("Employee");
            employee.setAttribute("id",""+emp.getId());
            employee.addContent(new Element("age").setText(""+emp.getAge()));
            employee.addContent(new Element("name").setText(emp.getName()));
            employee.addContent(new Element("gender").setText(emp.getGender()));
            employee.addContent(new Element("role").setText(emp.getRole()));
            doc.getRootElement().addContent(employee);
        }
        //JDOM document is ready now, lets write it to file now
        XMLOutputter xmlOutputter = new XMLOutputter(Format.getPrettyFormat());
        //output xml to console for debugging
        //xmlOutputter.output(doc, System.out);
        xmlOutputter.output(doc, new FileOutputStream(fileName));
    }

}

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Running the program will get the following XML file:
employees.xml

<?xml version="1.0" encoding="UTF-8"?><Employees xmlns="http://www.journaldev.com/employees">
  <Employee xmlns="" id="1">
    <age>25</age>
    <name>Pankaj</name>
    <gender>Male</gender>
    <role>Java Developer</role>
  </Employee>
  <Employee xmlns="" id="2">
    <age>34</age>
    <name>Mona</name>
    <gender>Female</gender>
    <role>Manager</role>
  </Employee>
  <Employee xmlns="" id="3">
    <age>45</age>
    <name>Dave</name>
    <gender>Male</gender>
    <role>Support</role>
  </Employee></Employees>

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Original address: http://www.php.cn/

In the previous tutorial, we learned how to use JDOM to parse and modify the content of XML files. This section introduces how to convert Java objects into XML data and generate files.
JDOM's Document class provides convenient methods to create elements and attributes. The XMLOutputter class can write Document to any OutputStream and Writer object.
In this example we create a collection of Employee objects and write it to an XML file.
Employee.java

package com.journaldev.xml;
public class Employee {    
private int id;    
private String name;    
private String gender;    
private int age;    
private String role;    
public Employee(){}    
public Employee(int id, String name, int age, String gender, String role){        
this.id=id;        
this.age=age;        
this.name=name;        
this.gender=gender;        
this.role=role;
    }    public int getId() {        
    return id;
    }    public void setId(int id) {        
    this.id = id;
    }    public String getName() {        
    return name;
    }    public void setName(String name) {        
    this.name = name;
    }    public String getGender() {        
    return gender;
    }    public void setGender(String gender) {        
    this.gender = gender;
    }    public int getAge() {        
    return age;
    }    public void setAge(int age) {        
    this.age = age;
    }    public String getRole() {        
    return role;
    }    public void setRole(String role) {        
    this.role = role;
    }

}

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We use the Employee object id as an attribute of the Employee element in the XML file, and set the namespace of the root element Employees to "http://www.php.cn/"
JDOMXMLWriter.java

package com.journaldev.xml.jdom;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;import org.jdom2.Document;
import org.jdom2.Element;import org.jdom2.Namespace;
import org.jdom2.output.Format;
import org.jdom2.output.XMLOutputter;
import com.journaldev.xml.Employee;
public class JDOMXMLWriter {

    public static void main(String[] args) throws IOException {
        List<Employee> empList = new ArrayList<>();
        empList.add(new Employee(1, "Pankaj",25,"Male","Java Developer"));
        empList.add(new Employee(2, "Mona",34,"Female","Manager"));
        empList.add(new Employee(3, "Dave",45,"Male","Support"));

        String fileName = "employees.xml";
        writeFileUsingJDOM(empList, fileName);
    }

    private static void writeFileUsingJDOM(List<Employee> empList, String fileName) throws IOException {
        Document doc = new Document();
        doc.setRootElement(new Element("Employees",  Namespace.getNamespace("http://www.journaldev.com/employees")));
        for(Employee emp : empList){
            Element employee = new Element("Employee");
            employee.setAttribute("id",""+emp.getId());
            employee.addContent(new Element("age").setText(""+emp.getAge()));
            employee.addContent(new Element("name").setText(emp.getName()));
            employee.addContent(new Element("gender").setText(emp.getGender()));
            employee.addContent(new Element("role").setText(emp.getRole()));
            doc.getRootElement().addContent(employee);
        }
        //JDOM document is ready now, lets write it to file now
        XMLOutputter xmlOutputter = new XMLOutputter(Format.getPrettyFormat());
        //output xml to console for debugging
        //xmlOutputter.output(doc, System.out);
        xmlOutputter.output(doc, new FileOutputStream(fileName));
    }

}

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Run the program and you will get the following XML file:
employees.xml

<?xml version="1.0" encoding="UTF-8"?><Employees xmlns="http://www.journaldev.com/employees">
  <Employee xmlns="" id="1">
    <age>25</age>
    <name>Pankaj</name>
    <gender>Male</gender>
    <role>Java Developer</role>
  </Employee>
  <Employee xmlns="" id="2">
    <age>34</age>
    <name>Mona</name>
    <gender>Female</gender>
    <role>Manager</role>
  </Employee>
  <Employee xmlns="" id="3">
    <age>45</age>
    <name>Dave</name>
    <gender>Male</gender>
    <role>Support</role>
  </Employee></Employees>

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