private void parseXMLWithPull(String xmlData) {
try {
// 1. 工厂类 , 借助工厂类实例的 nuwPullParser() 获得 XmlPullParse 的实例
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
XmlPullParser xmlPullParser = factory.newPullParser();
// 2. setInput() 将服务器返回的 XML 数据 (xmlData) 设置进去并开始解析
xmlPullParser.setInput(new StringReader(xmlData));
// 3. 开始解析
// 3.1 getEventType() 获取当前的解析事件
int eventType = xmlPullParser.getEventType();
String id = "";
String name = "";
String version = "";
// 3.2 循环解析当前节点 直到 文件结束
while (eventType != XmlPullParser.END_DOCUMENT) {
String nodeName = xmlPullParser.getName();
switch (eventType) {
// 开始解析某个节点
case XmlPullParser.START_TAG: {
if ("id".equals(nodeName)){
id = xmlPullParser.nextText();
} else if("version".equals(nodeName)) {
version = xmlPullParser.nextText();
} else if ("name".equals(nodeName)) {
name = xmlPullParser.nextText();
}
break;
}
// 完成解析某个节点
case XmlPullParser.END_TAG: {
if ("app".equals(nodeName)) {
Log.d(TAG, "parseXMLWithPull id is " + id);
Log.d(TAG, "parseXMLWithPull name is " + name);
Log.d(TAG, "parseXMLWithPull version is" + version);
}
break;
}
default:
break;
}
eventType = xmlPullParser.next();
}
} catch (XmlPullParserException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}MainActivity.java
private void parseXMLWithSAX(String xmlData) {
try {
// 创建工厂类
SAXParserFactory factory = SAXParserFactory.newInstance();
// 通过工厂类获取 XMLReader 对象
XMLReader xmlReader = factory.newSAXParser().getXMLReader();
ContentHandler handler = new ContentHandler();
//设置 ContentHanlder 实例到 XMLReader 中
xmlReader.setContentHandler(handler);
//开始执行解析
xmlReader.parse(new InputSource(new StringReader(xmlData)));
} catch (SAXException e) {
e.printStackTrace();
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
ContentHandler.java
public class ContentHandler extends DefaultHandler {
private static final String TAG = "ContentHandler";
private String nodeName;
private StringBuilder id;
private StringBuilder name;
private StringBuilder version;
/**
* Receive notification of the beginning of the document.
* <p>
* <p>By default, do nothing. Application writers may override this
* method in a subclass to take specific actions at the beginning
* of a document (such as allocating the root node of a tree or
* creating an output file).</p>
*
* @throws SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.ContentHandler#startDocument
*/
@Override
public void startDocument() throws SAXException {
id = new StringBuilder();
name = new StringBuilder();
version = new StringBuilder();
}
/**
* Receive notification of the end of the document.
* <p>
* <p>By default, do nothing. Application writers may override this
* method in a subclass to take specific actions at the end
* of a document (such as finalising a tree or closing an output
* file).</p>
*
* @throws SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.ContentHandler#endDocument
*/
@Override
public void endDocument() throws SAXException {
super.endDocument();
}
/**
* Receive notification of the start of an element.
* 记录当前节点名字
* <p>
* <p>By default, do nothing. Application writers may override this
* method in a subclass to take specific actions at the start of
* each element (such as allocating a new tree node or writing
* output to a file).</p>
*
* @param uri The Namespace URI, or the empty string if the
* element has no Namespace URI or if Namespace
* processing is not being performed.
* @param localName The local name (without prefix), or the
* empty string if Namespace processing is not being
* performed.
* @param qName The qualified name (with prefix), or the
* empty string if qualified names are not available.
* @param attributes The attributes attached to the element. If
* there are no attributes, it shall be an empty
* Attributes object.
* @throws SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.ContentHandler#startElement
*/
@Override
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
// 记录当前节点名字
nodeName = localName;
}
/**
* Receive notification of character data inside an element.
* <p>
* <p>By default, do nothing. Application writers may override this
* method to take specific actions for each chunk of character data
* (such as adding the data to a node or buffer, or printing it to
* a file).</p>
*
* @param ch The characters.
* @param start The start position in the character array.
* @param length The number of characters to use from the
* character array.
* @throws SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.ContentHandler#characters
*/
@Override
public void characters(char[] ch, int start, int length) throws SAXException {
// 根据当前的节点名判断将内容添加到哪一个 StringBuilder 中
if ("id".equals(nodeName)) {
id.append(ch, start, length);
} else if ("name".equals(nodeName)) {
name.append(ch, start, length);
} else if ("version".equals(nodeName)) {
version.append(ch, start, length);
}
}
/**
* Receive notification of the end of an element.
* <p>
* <p>By default, do nothing. Application writers may override this
* method in a subclass to take specific actions at the end of
* each element (such as finalising a tree node or writing
* output to a file).</p>
*
* @param uri The Namespace URI, or the empty string if the
* element has no Namespace URI or if Namespace
* processing is not being performed.
* @param localName The local name (without prefix), or the
* empty string if Namespace processing is not being
* performed.
* @param qName The qualified name (with prefix), or the
* empty string if qualified names are not available.
* @throws SAXException Any SAX exception, possibly
* wrapping another exception.
* @see org.xml.sax.ContentHandler#endElement
*/
@Override
public void endElement(String uri, String localName, String qName) throws SAXException {
if ("app".equals(localName)) {
Log.d(TAG, "endElement: id is " + id.toString().trim());
Log.d(TAG, "endElement: name is " + name.toString().trim());
Log.d(TAG, "endElement: version is " + version.toString().trim());
// 最后将 StringBuilder 清空
id.setLength(0);
name.setLength(0);
version.setLength(0);
}
}
}
