xml文档的pull解析与SAX解析

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一、Pull解析：

1.在java中的使用方法：

1）首先InputStream ins = this.getClass().getClassLoader().
getResourceAsStream("xxx.xml");获取到一个流对象

2）获取xml的解析工厂对象XmlPullParserFactory factory = XmlPullParserFactory.newInstance();

3）通过解析工厂获取xml解析器XmlPullParser parser = factory.newPullParser();

4）绑定需要解析的xml文件以及设置解编码格式，应该与xml文件的编码格式一致parser.setInput(ins, "UTF-8");

5）获取解析指针指向的当前标签类型int type = parser.getEventType();

6）通过指针遍历xml文件while(type != XmlPullParser.END_DOCUMENT)在循环体内执行你需要的操作，别忘了执行完操作移动指针指向下一个标签parser.next()

2.在Android中的使用方法：Android中的解析器构造方式与java不同因为都封装好了

XmlPullParser xpp = Xml.newPullParser();其他的与java都一样

Android中的代码示例：

private void parseXMLwithPull(InputStream input) {    try {        XmlPullParser parser = Xml.newPullParser();        parser.setInput(input,"UTF-8");        int type = parser.getEventType();        String id = "";        String name = "";        String version = "";        while (type != XmlPullParser.END_DOCUMENT) {            String nodeName = parser.getName();            switch (type) {                case XmlPullParser.START_TAG:                    if ("id".equals(nodeName)) {                        id = parser.nextText();                    } else if ("name".equals(nodeName)) {                        name = parser.nextText();                    } else if ("version".equals(nodeName)) {                        version = parser.nextText();                    }                    break;                case XmlPullParser.END_TAG:                    if ("app".equals(nodeName)) {                        Log.i("zhangdi",id);                        Log.i("zhangdi",name);                        Log.i("zhangdi",version);                    }                    break;            }            type = parser.next();        }    } catch (Exception e) {        e.printStackTrace();    }}

二、SAX解析：

1.新建一个SAXHandler类继承DefaultHandler，重写startDocument（开始xml解析的时候调用）、endDocument（结束xml解析的时候调用）、startElement（解析某个节点的时候调用）、endElement（完成解析某个节点的时候调用）以及characters（获取节点内容的时候调用）这5个方法；

2.构建xml解析工厂XMLParserFactory factory = XMLParserFactory.newInstance()；

3.通过解析工厂获取XMLReader reader = factory.newSAXParser.getXMLReader();

4.设置reader的解析handler reader.setContentHandler(newSAXHandler());

5.解析数据reader.parse();

Android示例代码：

1.SAXHandler：

public class SAXHandler extends DefaultHandler {    private String nodeName;    private StringBuilder id;    private StringBuilder name;    private StringBuilder version;    @Override    public void startDocument() throws SAXException {        super.startDocument();        id = new StringBuilder();        name = new StringBuilder();        version = new StringBuilder();    }    @Override    public void endDocument() throws SAXException {        super.endDocument();    }    @Override    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {        super.startElement(uri, localName, qName, attributes);        nodeName = localName;    }    @Override    public void endElement(String uri, String localName, String qName) throws SAXException {        super.endElement(uri, localName, qName);        if ("app".equals(localName)) {            Log.i("zhangdi",id.toString());            Log.i("zhangdi",name.toString());            Log.i("zhangdi",version.toString());            id.setLength(0);            name.setLength(0);            version.setLength(0);        }    }    @Override    public void characters(char[] ch, int start, int length) throws SAXException {        super.characters(ch, start, length);        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);        }    }}

2.具体解析步骤：

private void parseXMLwithSAX(String string) {    try {        SAXParserFactory factory = SAXParserFactory.newInstance();        XMLReader reader = factory.newSAXParser().getXMLReader();        SAXHandler handler = new SAXHandler();        reader.setContentHandler(handler);        reader.parse(new InputSource(new StringReader(string)));    } catch (Exception e) {        e.printStackTrace();    }}

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