Java&Xml教程（八）使用JDOM将Java对象转换为XML

在前面的教程中我们学习了如何使用JDOM解析和修改XML文件内容，本节介绍如何将Java对象转换为XML数据并生成文件。
JDOM的Document类提供了便捷的方法创建元素和属性，XMLOutputter 类能将Document写到任何OutputStream和Writer对象中。
在本例中我们创建Employee对象集合并将它写到XML文件中。
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;    }}

我们将Employee对象id作为XML文件中Employee元素的属性，并且设置根元素Employees的命名空间为“http://www.journaldev.com/employees”
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));    }}

运行程序将获得下面的XML文件：
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>

原文地址：http://www.journaldev.com/1211/jdom-write-xml-file-example-from-object