xml文件的解析过程详解
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xml⽂件的解析过程详解
XML项⽬⼯程展⽰图如下图：
student.xml ⽂件展⽰：
余超
男
⼀个执着⽽⼜天真的孩⼦
马靖
⼥
⼀个特别难追求的⼥孩⼦
Student实体类的展⽰：其作⽤就是⽤于临时保存xml⽂件中的数据到属性中
package net.nyist.xmlparse.domain;
import java.io.Serializable;
/**
* @author yuchao
*
* @school 南阳理⼯软件学院移动设备应⽤与开发移动四班
*
* @email yu0312chao@163.com
*
* @time 2014年9⽉30⽇ 下午10:52:47
*/
@SuppressWarnings("serial")
public class Student implements Serializable {
private int id;
private String name;
private String sex;
private String desc;
public Student() {
}
public Student(int id, String name, String sex, String desc) {
this.id = id;
this.name = name;
this.sex = sex;
this.desc = desc;
}
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 getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) { this.desc = desc;
}
@Override
public String toString() {
return "Student [id=" + id + ", name=" + name + ", sex=" + sex
+ ", desc=" + desc + "]";
}
}
⽅法⼀：通过DOM来解析XML⽂件
package net.nyist.xmlparse.parse.dom
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import net.nyist.xmlparse.domain.Student;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/**
* @author yuchao
*
* @school 南阳理⼯软件学院移动设备应⽤与开发移动四班
*
* @email yu0312chao@163.com
*
* @time 2014年9⽉30⽇ 下午11:12:57
*/
public class DocumentBuilderFactoryDemo {
public static void main(String[] args) {
long start = System.currentTimeMillis();
/** ⾸先得到：得到 DOM 解析器的⼯⼚实例 */
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory
.newInstance();
List students = new ArrayList();
try {
/** 然后从 DOM ⼯⼚获得 DOM 解析器 */
DocumentBuilder documentBuilder = documentBuilderFactory
.newDocumentBuilder();
InputStream is = DocumentBuilderFactoryDemo.class.getClassLoader()
.getResourceAsStream("student.xml");
Document document = documentBuilder.parse(is);
/** 得到 XML ⽂档的根节点 */
Element element = document.getDocumentElement();
NodeList nodeList = element.getElementsByTagName("student");
Student student = null;
for (int i = 0; i < nodeList.getLength(); i++) {
Node node = nodeList.item(i);
int id = Integer.parseInt(node.getAttributes()
.getNamedItem("id").getNodeValue());
String nameValue = "";
String sexValue = "";
String descValue = "";
if (node.hasChildNodes()) {
NodeList childNodes = node.getChildNodes();
for (int j = 0; j < childNodes.getLength(); j++) {
Node node2 = childNodes.item(j);
if ("name".equals(node2.getNodeName())) {
nameValue = node2.getFirstChild().getTextContent();
} else if ("sex".equals(node2.getNodeName())) {
sexValue = node2.getFirstChild().getTextContent();
} else if ("desc".equals(node2.getNodeName())) {
descValue = node2.getFirstChild().getTextContent();
}
}
student = new Student(id, nameValue, sexValue, descValue); students.add(student);
}
}
} catch (Exception e) {
e.printStackTrace();
}
for (int i = 0; students != null && students.size() > 0
&& i < students.size(); i++) {
System.out.println(students.get(i));
}
System.out.println("共⽤时："+(System.currentTimeMillis()-start));
}
}
⽅法⼆：⽤SAX解析XML⽂件
package net.nyist.xmlparse.parse.sax;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import net.nyist.xmlparse.domain.Student;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
/**
* @author yuchao
*
* @school 南阳理⼯软件学院移动设备应⽤与开发移动四班
*
* @email yu0312chao@163.com
*
* @time 2014年10⽉1⽇ 下午6:38:52
*
* @deprecated 本类是⽤来对于XML⽂本的解析类
*/
public class PersonHandle extends DefaultHandler {
private Student student;
private List students;
/**对于这个属性的使⽤主要作⽤是为了⽤来存放标签的名称，由此⽽获得这个标签下的⽂本内容的值*/
private String tagName;
public List getStudents() {
return students;
}
public InputSource resolveEntity(String publicId, String systemId)
throws IOException, SAXException {
return null;
}
public void setDocumentLocator(Locator locator) {
System.out.println("加载器开始处理xml⽂档........");
}
public void startDocument() throws SAXException {
System.out.println("⽂档开始加载.........");
students = new ArrayList();
}
public void endDocument() throws SAXException {
System.out.println("xml⽂档处理结束.........");
}
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException {
tagName = qName;
if ("student".equals(qName)) {
student = new Student();
