xml 解析的三种方法?dom解析：?public class DOMPersonService{public static ListPerson readXml(InputS
xml 解析的三种方法
?
dom解析：
?
public class DOMPersonService
{
public static List<Person> readXml(InputStream inStream) throws Exception
{
List<Person> persons=new ArrayList<Person>();
//实例化一个文档构建器工厂
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
//通过文档构建器工厂获取一个文档构建器
DocumentBuilder builder = factory.newDocumentBuilder();
//通过文档通过文档构建器构建一个文档实例
Document document = builder.parse(inStream);
Element root = document.getDocumentElement();
? ? ? ? ? ? ? ? //获取所有"pre:person"节。点
NodeList nodes = root.getElementsByTagName("pre:person");
for(int i = 0 ;i < nodes.getLength();i++)
{
Element personElement = (Element)nodes.item(i);
Person person =new Person();
person.setId(Integer.valueOf(personElement.getAttribute("id")));
NodeList childNodes = personElement.getChildNodes();
for(int j = 0;j<childNodes.getLength();j++)
{
Node childNode = (Node)childNodes.item(j);
if (childNode.getNodeType()==Node.ELEMENT_NODE)
{
Element childElement = (Element)childNode;
if ("name".equals(childElement.getNodeName()))
{
person.setName(childElement.getFirstChild().getNodeValue());
}
else if (("age".equals(childElement.getNodeName())))
{
person.setAge(new Short(childElement.getFirstChild().getNodeValue()));
}
}
}
persons.add(person);
}
return persons;
}
}
调用此类测试：public class DOMPersonServiceTest extends AndroidTestCase{private static final String TAG="PersonServiceTest";public void testReadXml() throws Exception{InputStream inStream=DOMPersonServiceTest.class.getClassLoader().getResourceAsStream("person.xml");? ? ? ? ? ? ? ?//解析出的xmlList<Person> persons=DOMPersonService.readXml(inStream);for (Person person : persons){Log.i(TAG, person.toString());}}}
SAX解析：public class SAXPersonService{public static List<Person> readXml(InputStream inStream) throws Exception{SAXParserFactory spf=SAXParserFactory.newInstance();SAXParser saxParser=spf.newSAXParser();//创建解析器XMLContentHandler handler=new XMLContentHandler();saxParser.parse(inStream, handler);inStream.close();return handler.getPersons();}}
关键是要实现这个方法：public class XMLContentHandler extends DefaultHandler{private static final String TAG = "XMLContentHandler";private List<Person> persons;private Person person;private String preTag;public List<Person> getPersons(){return persons;}@Overridepublic void startDocument() throws SAXException{persons = new ArrayList<Person>();Log.i(TAG, "开始解析...");}/** * uri：命名空间 * localName：不带命名空间前缀的标签名 * qName：带命名空间前缀的标签名 * attributes：属性集合 */@Overridepublic void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException{if ("person".equals(localName)){person = new Person();person.setId(new Integer(attributes.getValue("id")));}preTag = localName;Log.i(TAG, "解析元素："+localName);}/** * ch[]：内容 * start：其实位置 * length：长度 */@Overridepublic void characters(char[] ch, int start, int length) throws SAXException{if (person!=null){String data = new String(ch, start,length);if ("name".equals(preTag)){person.setName(data);}else if ("age".equals(preTag)){person.setAge(new Short(data));}}Log.i(TAG, "解析内容："+new String(ch, start,length));}
@Overridepublic void endElement(String uri, String localName, String qName) throws SAXException{if ("person".equals(localName)&&person!=null){persons.add(person);person = null;}preTag = null;Log.i(TAG, localName + "解析完毕");}
@Overridepublic void endDocument() throws SAXException{super.endDocument();Log.i(TAG, "文档解析完毕");}}
调用测试：public class SAXPersonServiceTest extends AndroidTestCase{private static final String TAG="SAXPersonServiceTest";public void testReadXml() throws Exception{InputStream inStream=SAXPersonServiceTest.class.getClassLoader().getResourceAsStream("person.xml");List<Person> persons=SAXPersonService.readXml(inStream);for (Person person : persons){Log.i(TAG, person.toString());}}}
3 PULL解析public class PullPersonService{public static List<Person> readXml(InputStream inStream) throws Exception{List<Person> persons=null;XmlPullParser parser=Xml.newPullParser();parser.setInput(inStream, "UTF-8");int eventCode=parser.getEventType();Person person=null;while(eventCode!=XmlPullParser.END_DOCUMENT){switch (eventCode){case XmlPullParser.START_DOCUMENT: //0 文档开始事件persons=new ArrayList<Person>();break;case XmlPullParser.START_TAG: ?//2 开始元素if ("person".equals(parser.getName())){person=new Person();person.setId(new Integer(parser.getAttributeValue(0)));}else if(null!=person){if ("name".equals(parser.getName())){person.setName(parser.nextText());}else if("age".equals(parser.getName())){person.setAge(new Short(parser.nextText()));}}break;case XmlPullParser.END_TAG: //结束元素if ("person".equals(parser.getName())&&person!=null){persons.add(person);person=null;}break;}eventCode=parser.next();}return persons;}}
调用测试public class PullPersonServiceTest extends AndroidTestCase{private static final String TAG="PersonServiceTest";public void testReadXml() throws Exception{InputStream inStream=PullPersonServiceTest.class.getClassLoader().getResourceAsStream("person.xml");List<Person> persons=PullPersonService.readXml(inStream);for (Person person : persons){Log.i(TAG, person.toString());}}}
要解析的文件：person.xml<?xml version="1.0" encoding="UTF-8"?><persons xmlns:pre="http://www.baidu.com"><pre:person id="001"><name>coolszy</name><age>22</age></pre:person><pre:person id="002"><name>kuka</name><age>22</age></pre:person></persons>
如果为网络的话，可以直接获得流：
InputStream inputStream = urlConn.getInputStream();
解析的内容存储：public class Person{private Integer id;private String name;private Short age;public Person(){super();}public Person(Integer id, String name, Short age){super();this.id = id;this.name = name;this.age = age;}
public Integer getId(){return id;}
public void setId(Integer id){this.id = id;}
public String getName(){return name;}
public void setName(String name){this.name = name;}
public Short getAge(){return age;}
public void setAge(Short age){this.age = age;}
@Overridepublic String toString(){return "id=" + getId() + ",name=" + getName() + ",age=" + getAge();}}
