Android创建与解析XML（二）――详解Dom方式

javax.xml.parsersjavax.xml.parsers.DocumentBuilder javax.xml.parsers.DocumentBuilderFactory javax.xml.parsers.ParserConfigurationException;javax.xml.transformjavax.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;

/** Dom方式，创建 XML */ 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", "//www.VeVB.COm/");   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<personsLen; i++) {       Element elePerson = doccreateElement("person");       eleRootappendChild(elePerson);              Element eleId = doccreateElement("id");       Node nodeId = doccreateTextNode(persons[i]getId() + "");       eleIdappendChild(nodeId);       elePersonappendChild(eleId);        Element eleName = doccreateElement("name");       Node nodeName = doccreateTextNode(persons[i]getName());       eleNameappendChild(nodeName);       elePersonappendChild(eleName);        Element eleBlog = doccreateElement("blog");       Node nodeBlog = doccreateTextNode(persons[i]getBlog());       eleBlogappendChild(nodeBlog);       elePersonappendChild(eleBlog);     }               Properties properties = new Properties();     propertiessetProperty(OutputKeysINDENT, "yes");     propertiessetProperty(OutputKeysMEDIA_TYPE, "xml");     propertiessetProperty(OutputKeysVERSION, "0");     propertiessetProperty(OutputKeysENCODING, "utf-8");     propertiessetProperty(OutputKeysMETHOD, "xml");     propertiessetProperty(OutputKeysOMIT_XML_DECLARATION, "yes");          TransformerFactory transformerFactory = TransformerFactorynewInstance();     Transformer transformer = transformerFactorynewTransformer();     transformersetOutputProperties(properties);          DOMSource domSource = new DOMSource(docgetDocumentElement());     OutputStream output = new ByteArrayOutputStream();     StreamResult result = new StreamResult(output);     transformertransform(domSource, result);          xmlWriter = outputtoString();        } catch (ParserConfigurationException e) {   // factorynewDocumentBuilder     eprintStackTrace();   } catch (DOMException e) {           // doccreateElement     eprintStackTrace();   } catch (TransformerFactoryConfigurationError e) {   // TransformerFactorynewInstance     eprintStackTrace();   } catch (TransformerConfigurationException e) {   // transformerFactorynewTransformer     eprintStackTrace();   } catch (TransformerException e) {       // transformertransform     eprintStackTrace();   } catch (Exception e) {     eprintStackTrace();   }      savedXML(fileName, xmlWritertoString());      return xmlWritertoString(); } 

/** Dom方式，解析 XML */ 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("/t/t");     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<personsLen; i++) {       Element elePerson = (Element) nlPersonitem(i);   // person节点       Person person = new Person();            // 创建Person对象              NodeList nlId = elePersongetElementsByTagName("id");       Element eleId = (Element)nlIditem(0);       String id = eleIdgetChildNodes()item(0)getNodeValue();       personsetId(IntegerparseInt(id));              NodeList nlName = elePersongetElementsByTagName("name");       Element eleName = (Element)nlNameitem(0);       String name = eleNamegetChildNodes()item(0)getNodeValue();       personsetName(name);              NodeList nlBlog = elePersongetElementsByTagName("blog");       Element eleBlog = (Element)nlBlogitem(0);       String blog = eleBloggetChildNodes()item(0)getNodeValue();       personsetBlog(blog);              xmlWriterappend(persontoString())append("/n");       persons[i] = person;     }        } catch (ParserConfigurationException e) {   // factorynewDocumentBuilder     eprintStackTrace();   } catch (SAXException e) {   // builderparse     eprintStackTrace();   } catch (IOException e) {    // builderparse     eprintStackTrace();   } catch (Exception e) {     eprintStackTrace();   }      return xmlWritertoString(); } 

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";   } }