android中xml解析之xmlpull篇

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Xml作为编程中一种重要的数据处理格式，用于标记数据、定义数据类型，是一种允许用户自己定义标记的源语言。Xml作为一种轻量级的数据文件，具有以下优点：

内容与结构完全分离

互操作性强

规范统一

支持多种编码

可扩展性强

常用于以下场合：

数据交换

Web服务

内容管理

配置

下面我将针对android中xml的处理做一些介绍，以此作为笔记以便后期查看与阅读。在编程中比较常用的xml解析方式有XmlPull、Sax、Dom等

1 利用XMLPull进行xml数据解析

XmlPull数据解析是以事件的方式进行文档解析的，如开始元素事件与结束元素事件，使用parser.next()进入下一个元素并触发相应的事件。事件将作为代码被发送，可以通过switch对需要的事件进行处理。

在此我提供一个xml文档，内容如下：

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

<Personid="1" name="tom" sex="female"description="" address="sichuan" />

<Personid="2" name="jim" sex="male"description="" address="beijing" />

</Persons>

<Works>

<Workid="1" name="software" description="">

<Personrefid="1" />

<Content>Progromingjava application</Content>

</Work>

<Workid="2" name="hardware" description="">

<Personrefid="2" />

<Content>Progromingiphone application</Content>

</Work>

</Works>

</Configurations>

后面所讲述的DOM与SAX处理都将对上面的xml文档进行处理，下面我们开始针对上面的文档利用XmlPull进行解析与生成的处理吧！

1.1 首先需要定义两个实体，实体如下：

1.1.1 Person.java

public class Person {

privateint id;

privateString name;

privateString sex;

privateString description;

privateString address;

publicint getId() {

returnid;

}

publicvoid setId(int id) {

this.id= id;

}

publicString getName() {

returnname;

}

publicvoid setName(String name) {

this.name= name;

}

publicString getSex() {

returnsex;

}

publicvoid setSex(String sex) {

this.sex= sex;

}

publicString getDescription() {

returndescription;

}

publicvoid setDescription(String description) {

this.description= description;

}

publicString getAddress() {

returnaddress;

}

publicvoid setAddress(String address) {

this.address= address;

}

1.1.2 Work.java

package com.example.Entities;

public class Work {

privateint id;

privateString name;

privateString description;

privateint refid;

privateString content;

publicint getId() {

returnid;

}

publicvoid setId(int id) {

this.id= id;

}

publicString getName() {

returnname;

}

publicvoid setName(String name) {

this.name= name;

}

publicString getDescription() {

returndescription;

}

publicvoid setDescription(String description) {

this.description= description;

}

publicint getRefid() {

return refid;

}

publicvoid setRefid(int refid) {

this.refid= refid;

}

publicString getContent() {

returncontent;

}

publicvoid setContent(String content) {

this.content= content;

}

1.1.3 以下该类用于解析Persons节点下的内容

import java.io.InputStream;

import java.util.ArrayList;

import java.util.List;

import org.xmlpull.v1.XmlPullParser;

importorg.xmlpull.v1.XmlPullParserException;

import android.util.Xml;

import com.example.Entities.Person;

public class PersonXmlService {

publicPersonXmlService() {

}

publicstatic List<Person> getAllPersons(InputStream inputStream) {

List<Person>persons = new ArrayList<Person>();

XmlPullParserparser = Xml.newPullParser();

try{

parser.setInput(inputStream,"utf-8");

inteventCode = parser.getEventType();

Personperson = null;

while(eventCode != XmlPullParser.END_DOCUMENT) {

StringTAG = parser.getName();

switch (eventCode) {

caseXmlPullParser.START_DOCUMENT:

break;

caseXmlPullParser.START_TAG:

if("Person".equalsIgnoreCase(TAG)) {

person= new Person();

person.setId(Integer.parseInt(parser.getAttributeValue(

null,"id")));

person.setName(parser.getAttributeValue(null,"name"));

person.setSex(parser.getAttributeValue(null,"sex"));

person.setDescription(parser.getAttributeValue(null,"description"));

person.setAddress(parser.getAttributeValue(null,"address"));

}

break;

caseXmlPullParser.END_TAG:

if("Person".equalsIgnoreCase(TAG)) {

persons.add(person);

}

if("Persons".equalsIgnoreCase(TAG)) {

break;

}

break;

caseXmlPullParser.END_DOCUMENT:

break;

default:

break;

}

}catch (XmlPullParserException e) {

e.printStackTrace();

}

returnpersons;

}

方法中传入的InputStream属于将xml转换的输入流。Works节点下的内容解析就不做代码提供了，各位可以根据以上的实例自己编写以下Works节点下的内容解析。

1.1.4 以下代码用于生成Persons节点内容

public static voidConvertToXml(List<Person> persons) {

XmlSerializerserializer = Xml.newSerializer();

StringWriterwriter = new StringWriter();

try{

serializer.setOutput(writer);

serializer.startDocument("utf-8",false);

serializer.startTag(null,"Configurations");

serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output",false);

serializer.startTag(null,"Persons");

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

serializer.startTag(null,"Person");

serializer.attribute(null,"id", String.valueOf(persons.get(i).getId()));

serializer.attribute(null,"name", persons.get(i).getName());

serializer.attribute(null,"sex", persons.get(i).getSex());

serializer.attribute(null,"description", persons.get(i).getDescription());

serializer.attribute(null,"address", persons.get(i).getAddress());

serializer.endTag(null,"Person");

}

serializer.endTag(null,"Persons");

serializer.endDocument();

}catch (IllegalArgumentException e) {

e.printStackTrace();

}catch (IllegalStateException e) {

e.printStackTrace();

}catch (IOException e) {

e.printStackTrace();

}

借此机会将这些整理一下，供作参考，各位大牛们如有建议，希望多多赐教！不甚感激。