Android中SAX解析XML檔案

一、在assets檔案中寫一個xml檔案

<?xml version="1.0" encoding="UTF-8"?><persons><person id="23"><name>李明</name><age>30</age></person><person id="20"><name>李向梅</name><age>25</age></person></persons>

二、在service中寫一個SAX解析的類

package com.example.service;import java.util.ArrayList;import java.util.List;import org.xml.sax.Attributes;import org.xml.sax.SAXException;import org.xml.sax.helpers.DefaultHandler;import com.example.domain.Person;public class XMLContentHandler extends DefaultHandler{//解析的personObject Storage Service到list集合中private List<Person> persons;//解析當前的person對象public Person currentPerson;//聲明標籤的名稱public String tagName;//擷取解析所有的person對象public List<Person> getPersons() {return persons;}@Overridepublic void characters(char[] ch, int start, int length)throws SAXException {super.characters(ch, start, length);//首先判斷tagName是否為空白if(tagName!=null){String data=new String(ch,start,length);//判斷標籤是否為空白if(tagName.equals("name")){currentPerson.setName(data);}else if(tagName.equals("age")){//判斷標籤是否是agecurrentPerson.setAge((short) Integer.parseInt(data));}}}@Overridepublic void endDocument() throws SAXException {super.endDocument();}@Overridepublic void endElement(String uri, String localName, String qName)throws SAXException {super.endElement(uri, localName, qName);//當person標籤結束的時候把personObject Storage Service到集合中 if(localName.equals("person")){persons.add(currentPerson);currentPerson=null;}this.tagName=null;}/** * 文檔開始觸發的事件 */@Overridepublic void startDocument() throws SAXException {super.startDocument();persons=new ArrayList<Person>();}@Overridepublic void startElement(String uri, String localName, String qName,Attributes attributes) throws SAXException {super.startElement(uri, localName, qName, attributes);//判斷解析的標籤是否是personif(localName.equals("person")){currentPerson=new Person();//把id屬性的值解析出來 並且把id賦值給currentPerson對象currentPerson.setId(Integer.parseInt(attributes.getValue(0)));}this.tagName=localName;}}

三、在Activity中擷取SAX類的操作

package com.example.lession03_xml;import java.io.InputStream;import java.util.List;import javax.xml.parsers.SAXParser;import javax.xml.parsers.SAXParserFactory;import com.example.domain.Person;import com.example.service.XMLContentHandler;import com.example.service.XMLDomService;import android.os.Bundle;import android.app.Activity;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.view.inputmethod.InputBinding;import android.widget.Button;import android.widget.Toast;public class XmlActivity extends Activity {//聲明組件public Button btn_sax,btn_dom,btn_pull;public XMLDomService xmlDomService;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//設定顯示的視圖setContentView(R.layout.activity_xml);xmlDomService=new XMLDomService();//根據id擷取組件btn_sax=(Button) findViewById(R.id.btn_sax);btn_dom=(Button) findViewById(R.id.btn_dom);btn_pull=(Button) findViewById(R.id.btn_pull);//為按鈕註冊事件btn_sax.setOnClickListener(new MyOnclickListener());btn_dom.setOnClickListener(new MyOnclickListener());btn_pull.setOnClickListener(new MyOnclickListener());}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.xml, menu);return true;}//匿名類class MyOnclickListener implements OnClickListener{@Overridepublic void onClick(View v) {int id=v.getId();switch (id) {case R.id.btn_sax:Toast.makeText(XmlActivity.this, "採用SAX解析", Toast.LENGTH_LONG).show();try{//SAX解析的工廠對象SAXParserFactory factory=SAXParserFactory.newInstance();//得到sax的解析器SAXParser saxParser=factory.newSAXParser();//建立handler對象XMLContentHandler handlerService=new XMLContentHandler();InputStream is=getAssets().open("csdn.xml");//直接解析saxParser.parse(is, handlerService);//通過handlerService對象擷取Toast.makeText(XmlActivity.this, "----"+handlerService, Toast.LENGTH_LONG).show();}catch(Exception e){e.printStackTrace();}break;case R.id.btn_dom:InputStream is=null;try{//擷取讀取檔案的輸入資料流對象is=getAssets().open("csdn.xml");//採用dom解析List<Person> persons=xmlDomService.parseXML(is);//簡單測試//Toast.makeText(XmlActivity.this, ""+persons.get(0).getName(), Toast.LENGTH_LONG).show();Toast.makeText(XmlActivity.this, "採用DOM解析"+persons.get(0).getName(), Toast.LENGTH_LONG).show();}catch(Exception e){e.printStackTrace();}break;case R.id.btn_pull:Toast.makeText(XmlActivity.this, "採用PULL解析", Toast.LENGTH_LONG).show();break;default:break;}}}}