Android创建与解析XML（二）——详解Dom方式

1. Dom概述

Dom方式创建XML，应用了标准xml构造器 javax.xml.parsers.documentBuilder 来创建 XML 文档，需要导入以下内容

javax.xml.parsers

javax.xml.parsers.documentBuilder 

javax.xml.parsers.documentBuilderFactory 

javax.xml.parsers.ParserConfigurationException;
javax.xml.transform

javax.xml.transform.TransformerFactory 

javax.xml.transform.Transformer 

javax.xml.transform.dom.DOMSource 

javax.xml.transform.stream.StreamResult 

javax.xml.transform.OutputKeys;

javax.xml.transform.TransformerFactoryConfigurationError;

javax.xml.transform.TransformerConfigurationException;

javax.xml.transform.TransformerException;

org.w3c.dom 

org.w3c.dom.document;

org.w3c.dom.Element;

org.w3c.dom.Node;

org.w3c.dom.DOMException;

org.w3c.dom.NodeList;

org.xml.sax.SAXException;

创建和解析xml的效果图：

2、Dom 创建 XML

Dom，借助 javax.xml.parsers.documentBuilder，可以创建 org.w3c.dom.document 对象。

使用来自 documentBuilderFactory 的 documentBuilder 对象在 Android 设备上创建与解析 XML 文档。您将使用 XML pull 解析器的扩展来解析 XML 文档。

 
public String domCreateXML() { 
  String xmlWriter = null; 
   
  Person []persons = new Person[3];    // 创建节点Person对象 
  persons[0] = new Person(1, "sunboy_2050", "https://www.jb51.net/"); 
  persons[1] = new Person(2, "baidu", "http://wwwbaiducom"); 
  persons[2] = new Person(3, "google", "http://wwwgooglecom"); 
   
  try { 
    documentBuilderFactory factory = documentBuilderFactorynewInstance(); 
    documentBuilder builder = factorynewdocumentBuilder(); 
    document doc = buildernewdocument(); 
     
    Element eleRoot = doccreateElement("root"); 
    eleRootsetAttribute("author", "homer"); 
    eleRootsetAttribute("date", "2012-04-26"); 
    docappendChild(eleRoot); 
     
    int personsLen = personslength; 
    for(int i=0; i

运行结果：




3、Dom 解析 XML
Dom方式，解析XML是创建XML的逆过程，主要用到了builder.parse(is)进行解析，然后通过Tag、NodeList、Element、childNotes等得到Element和Node属性或值。

 
public String domResolveXML() { 
  StringWriter xmlWriter = new StringWriter(); 
   
  InputStream is= readXML(fileName); 
  try { 
    documentBuilderFactory factory = documentBuilderFactorynewInstance(); 
    documentBuilder builder = factorynewdocumentBuilder(); 
    document doc = builderparse(is); 
 
    docgetdocumentElement()normalize(); 
    NodeList nlRoot = docgetElementsByTagName("root"); 
    Element eleRoot = (Element)nlRootitem(0); 
    String attrAuthor = eleRootgetAttribute("author"); 
    String attrDate = eleRootgetAttribute("date"); 
    xmlWriterappend("root")append("tt"); 
    xmlWriterappend(attrAuthor)append("t"); 
    xmlWriterappend(attrDate)append("n"); 
     
    NodeList nlPerson = eleRootgetElementsByTagName("person"); 
    int personsLen = nlPersongetLength(); 
    Person []persons = new Person[personsLen]; 
    for(int i=0; i

运行结果：




4、Person类
Person类，是创建xml的单位实例，基于Java面向对象定义的一个类



public class Person { 
  private int id; 
  private String name; 
  private String blog; 
   
  public Person() { 
    thisid = -1; 
    thisname = ""; 
    thisblog = ""; 
  } 
 
  public Person(int id, String name, String blog) { 
    thisid = id; 
    thisname = name; 
    thisblog = blog; 
  } 
   
  public Person(Person person) { 
    thisid = personid; 
    thisname = personname; 
    thisblog = personblog; 
  } 
 
  public Person getPerson(){ 
    return this; 
  } 
   
  public void setId(int id) { 
    thisid = id; 
  } 
   
  public int getId(){ 
    return thisid; 
  } 
   
  public void setName(String name) { 
    thisname = name; 
  } 
 
  public String getName() { 
    return thisname; 
  } 
 
  public void setBlog(String blog) { 
    thisblog = blog; 
  } 
 
  public String getBlog() { 
    return thisblog; 
  } 
 
  public String toString() { 
    return "Person nid = " + id + "nname = " + name + "nblog = " + blog + "n"; 
  } 
} 


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