xml文件的jdom解析

dom4j解析: http://blog.csdn.net/java4found/article/details/8665982

dom解析:http://blog.csdn.net/java4found/article/details/8665034

sax解析:http://blog.csdn.net/java4found/article/details/8663214

jdom解析xml，是基于树型结构，其利用的是纯java技术，实现对xml文档的各种操作。jdom可以说是直接为java编程服务的，把sax与dom的功能有效的结合起来。

由于jdom致力于隐藏解析xml的复杂性，因此用jdom解析xml就和java new一个新的对象一般，操作也是非常容易的。在jdom中，xml本身就是一个Document实例，每一个元素标签则为Element实例，属性则为Attribute实例，通过这些对象，对xml的操作会显得格外的简单。

使用jdom要下载jdom的开发包：jdom-jar下载地址：http://www.jdom.org/dist/binary/

将jdom.jar加入到工程目录中。

下面是一个person.xml文件：

<?xml version="1.0" encoding="UTF-8"?><persons><person id="328"><name>zhangsan</name><age>23</age></person><person id="303"><name>lisi</name><age>22</age></person></persons>

将解析出来的对象封装成Person对象，以下是Person类：

public class Person {private int id;private String name;private int age;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 int getAge() {return age;}public void setAge(int age) {this.age = age;}@Overridepublic int hashCode() {final int prime = 31;int result = 1;result = prime * result + age;result = prime * result + id;result = prime * result + ((name == null) ? 0 : name.hashCode());return result;}@Overridepublic boolean equals(Object obj) {if (this == obj)return true;if (obj == null)return false;if (getClass() != obj.getClass())return false;Person other = (Person) obj;if (age != other.age)return false;if (id != other.id)return false;if (name == null) {if (other.name != null)return false;} else if (!name.equals(other.name))return false;return true;}@Overridepublic String toString() {return "Person [id=" + id + ", name=" + name + ", age=" + age + "]";}public Person(int id, String name, int age) {super();this.id = id;this.name = name;this.age = age;}public Person() {super();}}

使用JDom来解析person.xml：

import java.io.IOException;import java.io.InputStream;import java.util.ArrayList;import java.util.List;import org.jdom2.Attribute;import org.jdom2.Document;import org.jdom2.Element;import org.jdom2.JDOMException;import org.jdom2.input.SAXBuilder;public class JDomTest {public static void main(String[] args) {//创建解析器对象SAXBuilder builder = new SAXBuilder();//获取xml输入流InputStream in = JDomTest.class.getClassLoader().getResourceAsStream("person.xml");try {//获得代表整个xml的Document对象Document document = builder.build(in);//获取根结点<persons>Element root = document.getRootElement();//获取根结点下的子结点<person>集合List<Element> list = root.getChildren();ArrayList<Person> persons = new ArrayList<Person>();Person person = null;//遍历<person>对应数据内容，将数据封装成Person对象后，放入集合中for (Element e : list) {person = new Person();//获取当前<person>结点的属性对象，并得到id的值Attribute idAtt = e.getAttribute("id");person.setId(idAtt.getIntValue());//获取<person>的子结点集合List<Element> childlist = e.getChildren();//遍历集合，获取name与age的值for (Element ce : childlist) {if ("name".equals(ce.getName())) {String name = ce.getText();person.setName(name);}if ("age".equals(ce.getName())) {String age = ce.getText();person.setAge(Integer.valueOf(age));}}//完成一次<person>遍历后，将获取的Person对象存入集合中。persons.add(person);person = null;}//完成数据读取，打印调试。printList(persons);} catch (JDOMException | IOException e) {e.printStackTrace();}}//用于打印集合。public static void printList(ArrayList<Person> persons) {for (Person p : persons) {System.out.println(p);}}}