1、About documentBuilderFactory API description

1）、 javax.xml.parsers 包DocumentBuilderFactory創建DOM模式的解析器對象, DocumentBuilderFactory是抽象工廠類，不能直接實例化，但是有newInstance方法


2）、DocumentBuilderFactory.newInstance() 得到創建 DOM 解析器的工廠

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DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance()

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3）、newDocumentBuilder方法得到 DOM 解析器對象

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DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();

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4)、DOM解析器解析輸入流，這里可以是XML，文檔轉化為輸入流，或者字符串轉為ByteArrayInputStream,DOM 解析器對象的 parse() 方法解析 XML 文檔，得到代表整個文檔的 Document 對象

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InputStream is = new FileInputStream("xxx.xml"); documentBuilder.parse(is); documentBuilder.parse(new ByteArrayInputStream(str.getBytes()));

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5)、得到 XML 文檔的根節點

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Element rootElement = document.getDocumentElement();

6)、得到節點的子節點

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NodeList studentInfo = appElement.getChildNodes();

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2、Test Demo

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Student.java文件

package com.parse.doc;public class Student {public String name;public String age;public String sex;public Student() {}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getAge() {return age;}public void setAge(String age) {this.age = age;}public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}@Overridepublic String toString() {return "name=" + name + ", age=" + age + ", sex=" + sex;} }

ParseXml.java文件

package com.parse.doc;import java.io.ByteArrayInputStream; import java.util.ArrayList; import java.util.List;import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory;import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.NodeList;public class ParseXml {public static String xml = "<Students><student><name><![CDATA[陳喻]]></name><age><![CDATA[26]]></age><sex><![CDATA[男]]></sex></student><student><name><![CDATA[陳彩鳳]]></name><age><![CDATA[25]]></age><sex><![CDATA[女]]></sex></student><student><name><![CDATA[陳紫宣]]></name><age><![CDATA[2]]></age><sex><![CDATA[女]]></sex></student><student><name><![CDATA[陳紫曦]]></name><age><![CDATA[7個月]]></age><sex><![CDATA[女]]></sex></student></Students>";public static final String STUDENT = "student";public static final String NAME = "name";public static final String AGE = "age";public static final String SEX = "sex";public static void main(String args[]) {List<Student> students = parseXmlByDoc(xml);if (students != null && students.size() > 0) {for (Student student : students) {System.out.println(student);}} else {System.out.println("students size is 0");}}public static List<Student> parseXmlByDoc(String str) {if (str == null || "".equals(str)) {System.out.println("str is null or ''");return null;}DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();List<Student> students = new ArrayList<Student>();DocumentBuilder documentBuilder;try {documentBuilder = documentBuilderFactory.newDocumentBuilder();Document document = documentBuilder.parse(new ByteArrayInputStream(str.getBytes()));Element rootElement = document.getDocumentElement();NodeList studentNodeList = rootElement.getElementsByTagName(STUDENT);for (int i = 0; i < studentNodeList.getLength(); i++) {Element appElement = (Element) studentNodeList.item(i);NodeList studentInfo = appElement.getChildNodes();Student student = new Student();for(int j = 0; j < studentInfo.getLength(); j++) { Element element = (Element) studentInfo.item(j);String appAttr = element.getTagName();switch (appAttr) {case NAME:student.setName(element.getTextContent());break;case AGE:student.setAge(element.getTextContent());break;case SEX:student.setSex(element.getTextContent());break;default:break;} }students.add(student);}} catch (Exception e) {e.printStackTrace();return null;}return students;} }

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3、Running results

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name=陳喻, age=26, sex=男 name=陳彩鳳, age=25, sex=女 name=陳紫宣, age=2, sex=女 name=陳紫曦, age=7個月, sex=女

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