XML解析三種方式

DOM

通用性強，它會將XML文件的所有內容讀取到內存中，然后允許您使用DOM API遍歷XML樹、檢索所需的數據；

簡單直觀，但需要將文檔讀取到內存，并不太適合移動設備；

SAX

SAX是一個解析速度快并且占用內存少的xml解析器；

采用事件驅動，它并不需要解析整個文檔；

實現：繼承DefaultHandler，覆寫startElement、endElement、characters等方法；

PULL

Android自帶的XML解析器，和SAX基本類似，也是事件驅動，不同的是PULL事件返回的是數值型；推薦使用。

?

PULL解析XML核心代碼

[java]?view plaincopy

XmlPullParser?parser?=?XmlPullParserFactory.newInstance().newPullParser();??

parser.setInput(fileInputStream,?“utf-8”);//設置數據源編碼??

int?eventCode?=?parser.getEventType();//獲取事件類型??

while(eventCode?!=?XmlPullParser.END_DOCUMENT)??{?????

????switch?(eventCode){?????

????????case?XmlPullParser.START_DOCUMENT:?//開始讀取XML文檔????

????????//實例化集合類????

????????break;?????

????case?XmlPullParser.START_TAG://開始讀取某個標簽???????

????????if("person".equals(parser.getName()))?{?????

????????//通過getName判斷讀到哪個標簽，然后通過nextText()獲取文本節點值，或通過getAttributeValue(i)獲取屬性節點值??

????????}?????

????????break;??

????case?XmlPullParser.END_TAG://讀完一個Person，可以將其添加到集合類中??

????????break;??

????}??

????parser.next();??

}??

PULL解析XML示例方法

Java方法 [java]?view plaincopy

public?static?List<Person>?readXML(InputStream?inStream)?{??

????XmlPullParser?parser?=?Xml.newPullParser();??

????try?{??

????????parser.setInput(inStream,?"UTF-8");//?設置數據源編碼??

????????int?eventType?=?parser.getEventType();//?獲取事件類型??

????????Person?currentPerson?=?null;??

????????List<Person>?persons?=?null;??

????????while?(eventType?!=?XmlPullParser.END_DOCUMENT)?{??

????????????switch?(eventType)?{??

????????????case?XmlPullParser.START_DOCUMENT://?文檔開始事件,可以進行數據初始化處理??

????????????????persons?=?new?ArrayList<Person>();//?實例化集合類??

????????????????break;??

????????????case?XmlPullParser.START_TAG://開始讀取某個標簽??

????????????????//通過getName判斷讀到哪個標簽，然后通過nextText()獲取文本節點值，或通過getAttributeValue(i)獲取屬性節點值??

????????????????String?name?=?parser.getName();??

????????????????if?(name.equalsIgnoreCase("person"))?{??

????????????????????currentPerson?=?new?Person();??

????????????????????currentPerson.setId(new?Integer(parser.getAttributeValue(null,?"id")));??

????????????????}?else?if?(currentPerson?!=?null)?{??

????????????????????if?(name.equalsIgnoreCase("name"))?{??

????????????????????????currentPerson.setName(parser.nextText());//?如果后面是Text元素,即返回它的值??

????????????????????}?else?if?(name.equalsIgnoreCase("age"))?{??

????????????????????????currentPerson.setAge(new?Short(parser.nextText()));??

????????????????????}??

????????????????}??

????????????????break;??

????????????case?XmlPullParser.END_TAG://?結束元素事件??

????????????????//讀完一個Person，可以將其添加到集合類中??

????????????????if?(parser.getName().equalsIgnoreCase("person")&&?currentPerson?!=?null)?{??

????????????????????persons.add(currentPerson);??

????????????????????currentPerson?=?null;??

????????????????}??

????????????????break;??

????????????}??

????????????eventType?=?parser.next();??

????????}??

????????inStream.close();??

????????return?persons;??

????}?catch?(Exception?e)?{??

????????e.printStackTrace();??

????}??

????return?null;??

}??

應用

XML文件 [html]?view plaincopy

<?xml?version="1.0"?encoding="UTF-8"?>??

<persons>??

????<person?id="23">??

????????<name>孫洋洋</name>??

????????<age>30</age>??

????</person>??

????<person?id="20">??

????????<name>孫彬彬</name>??

????????<age>25</age>??

????</person>??

</persons>??

Activity文件 [java]?view plaincopy

package?com.app.data;??

??

import?java.io.BufferedWriter;??

import?java.io.File;??

import?java.io.FileInputStream;??

import?java.io.FileNotFoundException;??

import?java.io.FileOutputStream;??

import?java.io.InputStream;??

import?java.io.OutputStreamWriter;??

import?java.net.HttpURLConnection;??

import?java.net.URL;??

import?java.util.ArrayList;??

import?java.util.HashMap;??

import?java.util.List;??

??

import?org.xmlpull.v1.XmlPullParser;??

import?org.xmlpull.v1.XmlPullParserException;??

import?org.xmlpull.v1.XmlPullParserFactory;??

??

import?com.app.other.Person;??

??

import?android.app.Activity;??

import?android.os.Bundle;??

import?android.util.Xml;??

import?android.widget.TextView;??

??

public?class?XMLActivity?extends?Activity?{??

????@Override??

????protected?void?onCreate(Bundle?savedInstanceState)?{??

????????//?TODO?Auto-generated?method?stub??

????????super.onCreate(savedInstanceState);??

????????setContentView(R.layout.activity_xml);??

??????????

????????StringBuilder?sBuilder?=?new?StringBuilder();??

????????File?xmlFile?=?new?File("/mnt/sdcard/App/person.xml");??

????????try?{??

????????????FileInputStream?inputStream?=?new?FileInputStream(xmlFile);??

//??????????URL?url?=?new?URL("http://10.0.2.2:8888/android/person.xml");??

//??????????HttpURLConnection?urlConnection?=?(HttpURLConnection)?url.openConnection();??

//??????????InputStream?inputStream?=?urlConnection.getInputStream();??

????????????List<Person>?list?=?readXML(inputStream);??

????????????for?(int?i?=?0;?i?<?list.size();?i++)?{??

????????????????Person?person?=?list.get(i);??

????????????????sBuilder.append("第-"?+?i?+?"-條記錄：\n");??

????????????????sBuilder.append("getName--"?+?person.getName()?+?"\n");??

????????????????sBuilder.append("getAge--"?+?person.getAge()?+?"\n");??

????????????????sBuilder.append("getId--"?+?person.getId()?+?"\n");??

????????????}??

????????????inputStream.close();??

????????}?catch?(Exception?e)?{??

????????????//?TODO?Auto-generated?catch?block??

????????????e.printStackTrace();??

????????}??

????????TextView?textView?=?(TextView)findViewById(R.id.textView2);??

????????textView.setText(sBuilder);??

????}??

??

????public?static?List<Person>?readXML(InputStream?inStream)?{??

????????XmlPullParser?parser?=?Xml.newPullParser();??

????????try?{??

????????????parser.setInput(inStream,?"UTF-8");//?設置數據源編碼??

????????????int?eventType?=?parser.getEventType();//?獲取事件類型??

????????????Person?currentPerson?=?null;??

????????????List<Person>?persons?=?null;??

????????????while?(eventType?!=?XmlPullParser.END_DOCUMENT)?{??

????????????????switch?(eventType)?{??

????????????????case?XmlPullParser.START_DOCUMENT://?文檔開始事件,可以進行數據初始化處理??

????????????????????persons?=?new?ArrayList<Person>();//?實例化集合類??

????????????????????break;??

????????????????case?XmlPullParser.START_TAG://開始讀取某個標簽??

????????????????????//通過getName判斷讀到哪個標簽，然后通過nextText()獲取文本節點值，或通過getAttributeValue(i)獲取屬性節點值??

????????????????????String?name?=?parser.getName();??

????????????????????if?(name.equalsIgnoreCase("person"))?{??

????????????????????????currentPerson?=?new?Person();??

????????????????????????currentPerson.setId(new?Integer(parser.getAttributeValue(null,?"id")));??

????????????????????}?else?if?(currentPerson?!=?null)?{??

????????????????????????if?(name.equalsIgnoreCase("name"))?{??

????????????????????????????currentPerson.setName(parser.nextText());//?如果后面是Text元素,即返回它的值??

????????????????????????}?else?if?(name.equalsIgnoreCase("age"))?{??

????????????????????????????currentPerson.setAge(new?Short(parser.nextText()));??

????????????????????????}??

????????????????????}??

????????????????????break;??

????????????????case?XmlPullParser.END_TAG://?結束元素事件??

????????????????????//讀完一個Person，可以將其添加到集合類中??

????????????????????if?(parser.getName().equalsIgnoreCase("person")&&?currentPerson?!=?null)?{??

????????????????????????persons.add(currentPerson);??

????????????????????????currentPerson?=?null;??

????????????????????}??

????????????????????break;??

????????????????}??

????????????????eventType?=?parser.next();??

????????????}??

????????????inStream.close();??

????????????return?persons;??

????????}?catch?(Exception?e)?{??

????????????e.printStackTrace();??

????????}??

????????return?null;??

????}??

}??

XML布局文件 [html]?view plaincopy

<?xml?version="1.0"?encoding="utf-8"?>??

<LinearLayout?xmlns:android="http://schemas.android.com/apk/res/android"??

????android:layout_width="match_parent"??

????android:layout_height="match_parent"??

????android:orientation="vertical"??

????android:padding="15dp"?>??

??

????<TextView??

????????android:id="@+id/textView1"??

????????android:layout_width="wrap_content"??

????????android:layout_height="wrap_content"??

????????android:text="XML文件讀取"??

????????android:layout_gravity="center_horizontal"?/>??

??

????<TextView??

????????android:id="@+id/textView2"??

????????android:layout_width="wrap_content"??

????????android:layout_height="wrap_content"??

????????android:text="TextView"?/>??

??

</LinearLayout>??

XML文件位置 ? 執行結果：

總結

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