Android(安卓)创建与解析XML（二）—— 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;

sdk源码查看路径（google code）

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。

Code

[java] view plain copy print ?

/**Dom方式，创建XML*/
publicStringdomCreateXML(){
StringxmlWriter=null;
Person[]persons=newPerson[3];//创建节点Person对象
persons[0]=newPerson(1,"sunboy_2050","http://blog.csdn.net/sunboy_2050");
persons[1]=newPerson(2,"baidu","http://www.baidu.com");
persons[2]=newPerson(3,"google","http://www.google.com");
try{
DocumentBuilderFactoryfactory=DocumentBuilderFactory.newInstance();
DocumentBuilderbuilder=factory.newDocumentBuilder();
Documentdoc=builder.newDocument();
ElementeleRoot=doc.createElement("root");
eleRoot.setAttribute("author","homer");
eleRoot.setAttribute("date","2012-04-26");
doc.appendChild(eleRoot);
intpersonsLen=persons.length;
for(inti=0;i<personsLen;i++){
ElementelePerson=doc.createElement("person");
eleRoot.appendChild(elePerson);
ElementeleId=doc.createElement("id");
NodenodeId=doc.createTextNode(persons[i].getId()+"");
eleId.appendChild(nodeId);
elePerson.appendChild(eleId);
ElementeleName=doc.createElement("name");
NodenodeName=doc.createTextNode(persons[i].getName());
eleName.appendChild(nodeName);
elePerson.appendChild(eleName);
ElementeleBlog=doc.createElement("blog");
NodenodeBlog=doc.createTextNode(persons[i].getBlog());
eleBlog.appendChild(nodeBlog);
elePerson.appendChild(eleBlog);
}
Propertiesproperties=newProperties();
properties.setProperty(OutputKeys.INDENT,"yes");
properties.setProperty(OutputKeys.MEDIA_TYPE,"xml");
properties.setProperty(OutputKeys.VERSION,"1.0");
properties.setProperty(OutputKeys.ENCODING,"utf-8");
properties.setProperty(OutputKeys.METHOD,"xml");
properties.setProperty(OutputKeys.OMIT_XML_DECLARATION,"yes");
TransformerFactorytransformerFactory=TransformerFactory.newInstance();
Transformertransformer=transformerFactory.newTransformer();
transformer.setOutputProperties(properties);
DOMSourcedomSource=newDOMSource(doc.getDocumentElement());
OutputStreamoutput=newByteArrayOutputStream();
StreamResultresult=newStreamResult(output);
transformer.transform(domSource,result);
xmlWriter=output.toString();
}catch(ParserConfigurationExceptione){//factory.newDocumentBuilder
e.printStackTrace();
}catch(DOMExceptione){//doc.createElement
e.printStackTrace();
}catch(TransformerFactoryConfigurationErrore){//TransformerFactory.newInstance
e.printStackTrace();
}catch(TransformerConfigurationExceptione){//transformerFactory.newTransformer
e.printStackTrace();
}catch(TransformerExceptione){//transformer.transform
e.printStackTrace();
}catch(Exceptione){
e.printStackTrace();
}
savedXML(fileName,xmlWriter.toString());
returnxmlWriter.toString();
}

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。

Code

[java] view plain copy print ?

/**Dom方式，解析XML*/
publicStringdomResolveXML(){
StringWriterxmlWriter=newStringWriter();
InputStreamis=readXML(fileName);
try{
DocumentBuilderFactoryfactory=DocumentBuilderFactory.newInstance();
DocumentBuilderbuilder=factory.newDocumentBuilder();
Documentdoc=builder.parse(is);
doc.getDocumentElement().normalize();
NodeListnlRoot=doc.getElementsByTagName("root");
ElementeleRoot=(Element)nlRoot.item(0);
StringattrAuthor=eleRoot.getAttribute("author");
StringattrDate=eleRoot.getAttribute("date");
xmlWriter.append("root").append("\t\t");
xmlWriter.append(attrAuthor).append("\t");
xmlWriter.append(attrDate).append("\n");
NodeListnlPerson=eleRoot.getElementsByTagName("person");
intpersonsLen=nlPerson.getLength();
Person[]persons=newPerson[personsLen];
for(inti=0;i<personsLen;i++){
ElementelePerson=(Element)nlPerson.item(i);//person节点
Personperson=newPerson();//创建Person对象
NodeListnlId=elePerson.getElementsByTagName("id");
ElementeleId=(Element)nlId.item(0);
Stringid=eleId.getChildNodes().item(0).getNodeValue();
person.setId(Integer.parseInt(id));
NodeListnlName=elePerson.getElementsByTagName("name");
ElementeleName=(Element)nlName.item(0);
Stringname=eleName.getChildNodes().item(0).getNodeValue();
person.setName(name);
NodeListnlBlog=elePerson.getElementsByTagName("blog");
ElementeleBlog=(Element)nlBlog.item(0);
Stringblog=eleBlog.getChildNodes().item(0).getNodeValue();
person.setBlog(blog);
xmlWriter.append(person.toString()).append("\n");
persons[i]=person;
}
}catch(ParserConfigurationExceptione){//factory.newDocumentBuilder
e.printStackTrace();
}catch(SAXExceptione){//builder.parse
e.printStackTrace();
}catch(IOExceptione){//builder.parse
e.printStackTrace();
}catch(Exceptione){
e.printStackTrace();
}
returnxmlWriter.toString();
}

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

[java] view plain copy print ?

publicclassPerson{
privateintid;
privateStringname;
privateStringblog;
publicPerson(){
this.id=-1;
this.name="";
this.blog="";
}
publicPerson(intid,Stringname,Stringblog){
this.id=id;
this.name=name;
this.blog=blog;
}
publicPerson(Personperson){
this.id=person.id;
this.name=person.name;
this.blog=person.blog;
}
publicPersongetPerson(){
returnthis;
}
publicvoidsetId(intid){
this.id=id;
}
publicintgetId(){
returnthis.id;
}
publicvoidsetName(Stringname){
this.name=name;
}
publicStringgetName(){
returnthis.name;
}
publicvoidsetBlog(Stringblog){
this.blog=blog;
}
publicStringgetBlog(){
returnthis.blog;
}
publicStringtoString(){
return"Person\nid="+id+"\nname="+name+"\nblog="+blog+"\n";
}
}

代码下载

参考推荐：

org.w3c.dom

javax.xml.parsers

javax.xml.transform

dom创建xml

java dom创建xml

更多相关文章

随机推荐