android xml解析

XML解析实战

最新推荐文章于 2024-09-11 08:46:45 发布

原创最新推荐文章于 2024-09-11 08:46:45 发布 · 205 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#android #xml #sax #pull

android开发专栏收录该内容

24 篇文章

订阅专栏

本文介绍如何使用Pull和Sax两种方式解析XML文件，并提供详细的代码示例。通过对比这两种方法，帮助开发者选择最适合项目的XML解析方案。

1，要解析的xml文件文件

xml="<apps>\n" +
                " <app>\n" +
                "    <id>1</id>\n" +
                "    <name>burn</name>\n" +
                "    <version>1.0</version>\n" +
                "    <info>\n" +
                "      <size>10.5</size>\n" +
                "      <message>hhhhhhhh</message>\n" +
                "    </info>\n" +
                "    <info>\n" +
                "      <size>10.5</size>\n" +
                "      <message>hhhhhhhh</message>\n" +
                "    </info>\n" +
                " </app>\n" +
                " <app>\n" +
                "    <id>2</id>\n" +
                "    <name>burn2</name>\n" +
                "    <version>2.1</version>\n" +
                "    <info>\n" +
                "      <size>10.5</size>\n" +
                "      <message>hhhhhhhh</message>\n" +
                "    </info>\n" +
                "    <info>\n" +
                "      <size>10.5</size>\n" +
                "      <message>hhhhhhhh</message>\n" +
                "    </info>\n" +
                " </app>\n" +
                " <app>\n" +
                "    <id>3</id>\n" +
                "    <name>burn3</name>\n" +
                "    <version>3.2</version>\n" +
                "    <info>\n" +
                "      <size>10.5</size>\n" +
                "      <message>hhhhhhhh</message>\n" +
                "    </info>\n" +
                "    <info>\n" +
                "      <size>10.5</size>\n" +
                "      <message>hhhhhhhh</message>\n" +
                "    </info>\n" +
                " </app>\n" +
                "</apps>";

2，使用pull方式解析xml文件

private void parseXmlWithPull() {

try {

XmlPullParserFactory factory=XmlPullParserFactory.newInstance();

XmlPullParser parser=factory.newPullParser();

parser.setInput(new StringReader(xml));

int eventType=parser.getEventType();

String id="";

String name="";

String version="";

String size="";

String message="";

while (eventType!=parser.END_DOCUMENT){

String nodeName=parser.getName();

switch (eventType){

case XmlPullParser.START_TAG:

switch (nodeName){

case "id":

id=parser.nextText();

break;

case "name":

name=parser.nextText();

break;

case "version":

version=parser.nextText();

break;

case "size":

size=parser.nextText();

break;

case "message":

message=parser.nextText();

break;

default:

break;

}

break;

case XmlPullParser.END_TAG:

if ("app".equals(nodeName)){

Log.e("tag","id:"+id);

Log.e("tag","name:"+name);

Log.e("tag","version:"+version);

}else if ("info".equals(nodeName)){

Log.e("tag","size:"+size);

Log.e("tag","message:"+message);

}

break;

default:

break;

}

eventType=parser.next();

}

} catch (XmlPullParserException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

3，使用sax方式解析xml文件

private void parseXmlWithSax(){

try {

SAXParserFactory factory=SAXParserFactory.newInstance();

SAXParser parser=factory.newSAXParser();

XMLReader xmlReader=parser.getXMLReader();

ContentHandler ch=new ContentHandler();

xmlReader.setContentHandler(ch);

xmlReader.parse(new InputSource(new StringReader(xml)));

} catch (ParserConfigurationException e) {

e.printStackTrace();

} catch (SAXException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

public class ContentHandler extends DefaultHandler {

//characters方法不是一次获取全部数据，所有要将数据拼接

private StringBuilder id;

private StringBuilder name;

private StringBuilder version;

private StringBuilder size;

private StringBuilder message;

private String nodeName;

@Override

public void startDocument() throws SAXException {

id=new StringBuilder();

name=new StringBuilder();

version=new StringBuilder();

size=new StringBuilder();

message=new StringBuilder();

}

@Override

public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {

nodeName=localName;

}

@Override

public void characters(char[] ch, int start, int length) throws SAXException {

switch (nodeName){

case "id":

id.append(ch,start,length);

break;

case "name":

name.append(ch,start,length);

break;

case "version":

version.append(ch,start,length);

break;

case "size":

size.append(ch,start,length);

break;

case "message":

message.append(ch,start,length);

break;

default:

break;

}

}

@Override

public void endElement(String uri, String localName, String qName) throws SAXException {

if ("app".equals(localName)){

//获取的数据中含有多余的空格和换行需要去掉

Log.e("tag","id:"+id.toString().trim());

Log.e("tag","name:"+name.toString().trim());

Log.e("tag","version:"+version.toString().trim());

//清空

id.setLength(0);

name.setLength(0);

version.setLength(0);

}else if ("info".equals(localName)){

Log.e("tag","size:"+size.toString().trim());

Log.e("tag","message:"+message.toString().trim());

size.setLength(0);

message.setLength(0);

}

}

@Override

public void endDocument() throws SAXException {

}

}