SAX是一种占用内存少且解析速度快的解析器，它采用的是事件启动，它不需要解析完整个文档，而是按照内容顺序 看文档某个部分是否符合xml语法，如果符合就触发相应的事件，所谓的事件就是些回调方法(callback),这些方法 定义在ContentHandler中，下面是其主要方法：
startDocument:当遇到文档的时候就触发这个事件 调用这个方法 可以在其中做些预处理工作
startElement: (String namespaceURI,String localName,String qName,Attributes atts)当遇开始标签的时候就会触发这个方法。
endElement(String uri,String localName,String name)：当遇到结束标签时触发这个事件，调用此法可以做些善后工作。
charachers(char [] ch,int start,int length):当遇到xml内容时触发这个方法，用new String(ch,start,length)可以接受内容。
首先在 res目录下新建一个raw文件夹，然后再里面么新建一个student.xml
[代码] student.xml
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<?xml version="1.0" encoding="utf-8"?>
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<stundets>
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<student id="2009081315">
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<name>饶伟</name>
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<speciality>计算机科学与技术</speciality>
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<qq>812200157</qq>
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</student>
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<student id="2009081316">
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<name>小伟</name>
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<speciality>网络工程</speciality>
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<qq>812200156</qq>
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</student>
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<student id="2009081318">
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<name>伟哥</name>
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<speciality>软件工程</speciality>
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<qq>812200158</qq>
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</student>
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</stundets>
[代码] Student.java
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public class Student {
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long Id;
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String Name;
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String Speciality;
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long QQ;
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public Student(long id, String name, String speciality, long qQ) {
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super();
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Id = id;
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Name = name;
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Speciality = speciality;
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QQ = qQ;
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}
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public Student() {
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super();
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}
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public long getId() {
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return Id;
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}
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public String getName() {
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return Name;
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}
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public long getQQ() {
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return QQ;
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}
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public String getSpeciality() {
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return Speciality;
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}
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public void setId(long id) {
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Id = id;
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}
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public void setName(String name) {
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Name = name;
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}
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public void setQQ(long qQ) {
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QQ = qQ;
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}
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public void setSpeciality(String speciality) {
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Speciality = speciality;
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}
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}
[代码] StudentHandler.java
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package rw.Xml_SAX;
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import java.util.List;
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import org.xml.sax.Attributes;
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import org.xml.sax.SAXException;
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import org.xml.sax.helpers.DefaultHandler;
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import Android.util.Log;
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public class StudentHandler extends DefaultHandler {
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private String preTAG;
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private List<Student> ListStudent;
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private Student stu;
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public StudentHandler() {
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super();
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}
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public StudentHandler(List<Student> listStudent) {
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super();
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ListStudent = listStudent;
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}
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public void startDocument() throws SAXException {
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// TODO Auto-generated method stub
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Log.i("------>", "文档开始");
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super.startDocument();
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}
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public void startElement(String uri, String localName, String qName,
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Attributes attributes) throws SAXException {
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Log.i("localName-------->", localName);
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preTAG=localName;
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if ("student".equals(localName)) {
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stu=new Student();
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stu.setId(Long.parseLong(attributes.getValue(0)));
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for (int i = 0; i < attributes.getLength(); i++) {
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//Log.i("attributes-------->", attributes.getValue(i));
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Log.i("attributes-------->",String.valueOf(stu.getId()));
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}
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}
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super.startElement(uri, localName, qName, attributes);
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}
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public void endDocument() throws SAXException {
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Log.i("------>", "文档结束");
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super.endDocument();
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}
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public void endElement(String uri, String localName, String qName)
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throws SAXException {
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preTAG="";
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if ("student".equals(localName)) {
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ListStudent.add(stu);
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Log.i("-------->", "一个元素解析完成");
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}
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super.endElement(uri, localName, qName);
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}
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public void characters(char[] ch, int start, int length)
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throws SAXException {
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String dateString;
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if ("name".equals(preTAG)) {
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dateString=new String(ch,start,length);
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stu.setName(dateString);
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Log.i("name=", stu.getName());
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}else if ("speciality".equals(preTAG)) {
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dateString=new String(ch,start,length);
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stu.setSpeciality(dateString);
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Log.i("speciality=", stu.getSpeciality());
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}else if ("qq".equals(preTAG)) {
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dateString=new String(ch,start,length);
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stu.setQQ(Long.parseLong((dateString)));
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Log.i("QQ=", String.valueOf(stu.getQQ()));
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}
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super.characters(ch, start, length);
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}
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public List<Student> getListStudent() {
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return ListStudent;
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}
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public void setListStudent(List<Student> listStudent) {
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ListStudent = listStudent;
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}
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}
[代码] XMl_Sax1Activity.java
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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import javax.xml.parsers.SAXParserFactory;
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import org.xml.sax.InputSource;
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import org.xml.sax.XMLReader;
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import Android.app.Activity;
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import Android.os.Bundle;
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import Android.util.Log;
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import Android.view.View;
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import Android.view.View.OnClickListener;
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import Android.widget.Adapter;
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import Android.widget.ArrayAdapter;
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import Android.widget.Button;
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import Android.widget.ListView;
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import Android.widget.TextView;
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public class XMl_Sax1Activity extends Activity {
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private Button button;
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private TextView textView;
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private ListView listView;
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private List<String> list=new ArrayList<String>();
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.main);
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button=(Button)findViewById(R.id.button1);
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textView=(TextView)findViewById(R.id.textView1);
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listView=(ListView) findViewById(R.id.listView1);
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//InputSource xMLResourceString=new InputSource(XMl_Sax1Activity.this.getResources().openRawResource(R.raw.student));
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button.setOnClickListener(new ButtonListener());
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}
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class ButtonListener implements OnClickListener{
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@Override
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public void onClick(View v) {
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List<Student> students=parserXMl();
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for (Iterator iterator = students.iterator(); iterator.hasNext();) {
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Student student = (Student) iterator.next();
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list.add(String.valueOf(student.getId())+" "+student.getName()+" "+student.getSpeciality()+" "+String.valueOf((student.getQQ())));
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}
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ArrayAdapter<String> adapter=new ArrayAdapter<String>(getApplicationContext(), Android.R.layout.simple_list_item_1, list);
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listView.setAdapter(adapter);
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}
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}
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private List<Student> parserXMl()
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{
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SAXParserFactory factory=SAXParserFactory.newInstance();
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List<Student>students=null;
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Student student=null;
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try {
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XMLReader reader=factory.newSAXParser().getXMLReader();
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students=new ArrayList<Student>();
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reader.setContentHandler(new StudentHandler(students));
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reader.parse(newInputSource(XMl_Sax1Activity.this.getResources().openRawResource(R.raw.student)));
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for (Iterator iterator = students.iterator(); iterator.hasNext();) {
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student = (Student) students.iterator();
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}
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students.add(student);
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} catch (Exception e) {
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// TODO: handle exception
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}
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return students;
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}
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}
[代码] 布局文件main.xml
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<?xml version="1.0" encoding="utf-8"?>
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<LinearLayoutxmlns:Android="http://schemas.android.com/apk/res/android"
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Android:orientation="vertical"
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Android:layout_width="fill_parent"
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Android:layout_height="fill_parent"
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>
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<Button Android:text="SAX解析" android:id="@+id/button1"android:layout_height="wrap_content"android:layout_width="match_parent"></Button>
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<TextView Android:text="" android:id="@+id/textView1"android:layout_width="wrap_content"android:layout_height="wrap_content"></TextView>
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<ListView Android:layout_height="wrap_content"android:id="@+id/listView1" android:layout_width="match_parent"></ListView>
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</LinearLayout>
