XML的解析DOM

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 ?

1. /**Dom方式，创建XML*/
2. publicStringdomCreateXML(){
3. StringxmlWriter=null;
5. Person[]persons=newPerson[3];//创建节点Person对象
6. persons[0]=newPerson(1,"sunboy_2050","http://blog.csdn.net/sunboy_2050");
7. 1]=newPerson(2,"baidu","http://www.baidu.com");
8. 2]=newPerson(3,"google","http://www.google.com");
10. try{
11. DocumentBuilderFactoryfactory=DocumentBuilderFactory.newInstance();
12. DocumentBuilderbuilder=factory.newDocumentBuilder();
13. Documentdoc=builder.newDocument();
14. ElementeleRoot=doc.createElement("root");
15. eleRoot.setAttribute("author","homer");
16. eleRoot.setAttribute("date","2012-04-26");
17. doc.appendChild(eleRoot);
18. intpersonsLen=persons.length;
19. for(inti=0;i<personsLen;i++){
20. ElementelePerson=doc.createElement("person");
21. eleRoot.appendChild(elePerson);
22. ElementeleId=doc.createElement("id");
23. NodenodeId=doc.createTextNode(persons[i].getId()+"");
24. eleId.appendChild(nodeId);
25. elePerson.appendChild(eleId);
26. ElementeleName=doc.createElement("name");
27. NodenodeName=doc.createTextNode(persons[i].getName());
28. eleName.appendChild(nodeName);
29. elePerson.appendChild(eleName);
30. ElementeleBlog=doc.createElement("blog");
31. NodenodeBlog=doc.createTextNode(persons[i].getBlog());
32. eleBlog.appendChild(nodeBlog);
33. elePerson.appendChild(eleBlog);
34. }
35. Propertiesproperties=newProperties();
36. properties.setProperty(OutputKeys.INDENT,"yes");
37. properties.setProperty(OutputKeys.MEDIA_TYPE,"xml");
38. properties.setProperty(OutputKeys.VERSION,"1.0");
39. properties.setProperty(OutputKeys.ENCODING,"utf-8");
40. properties.setProperty(OutputKeys.METHOD,"xml");
41. properties.setProperty(OutputKeys.OMIT_XML_DECLaraTION,"yes");
42. TransformerFactorytransformerFactory=TransformerFactory.newInstance();
43. Transformertransformer=transformerFactory.newTransformer();
44. transformer.setoutputProperties(properties);
45. DOMSourcedomSource=newDOMSource(doc.getDocumentElement());
46. OutputStreamoutput=newByteArrayOutputStream();
47. StreamResultresult=newStreamResult(output);
48. transformer.transform(domSource,result);
49. xmlWriter=output.toString();
50. }catch(ParserConfigurationExceptione){//factory.newDocumentBuilder
51. e.printstacktrace();
52. }catch(DOMExceptione){//doc.createElement
53. }catch(TransformerFactoryConfigurationErrore){//TransformerFactory.newInstance
54. }catch(TransformerConfigurationExceptione){//transformerFactory.newTransformer
55. }catch(TransformerExceptione){//transformer.transform
56. }catch(Exceptione){
57. savedXML(fileName,xmlWriter.toString());
58. returnxmlWriter.toString();
59. }

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

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