Android XML文件解析

下面代码只能在Android系统上运行,不能使用Test方式运行,更加推荐PULL的方式解析,简单方便,不用写那么多代码

1.PULL解析

public void pullXML() throws XmlPullParserException, IOException {
    ////创建解析工厂
    XmlPullParserFactory factory = XmlPullParserFactory.newInstance();

    //创建解析
    XmlPullParser xmlPullParser = factory.newPullParser();

    //要解析的对象
    String in = "\n" +
            "\t\n" +
            "\t\t1\n" +
            "\t\t1.0\n" +
            "\t\tqq\n" +
            "\t\n" +
            "\t\n" +
            "\t\t2\n" +
            "\t\t2.0\n" +
            "\t\tweixin\n" +
            "\t\n" +
            "";

    //设置输入
    xmlPullParser.setInput(new StringReader(in));


    String id = "";
    String version = "";
    String name = "";

    //启动解析
    int eventType = xmlPullParser.getEventType();

    while (eventType != XmlPullParser.END_DOCUMENT) {
        //获取本次得到的结点名
        String tagName = xmlPullParser.getName();
        switch (eventType) {
            case XmlPullParser.START_TAG:
                //开始某个结点
                if ("id".equals(tagName)) {
                    //向前推动解析
                    id = xmlPullParser.nextText();
                }
                if ("version".equals(tagName)) {
                    //向前推动解析
                    version = xmlPullParser.nextText();
                }
                if ("name".equals(tagName)) {
                    //向前推动解析
                    name = xmlPullParser.nextText();
                }
                break;
            case XmlPullParser.END_TAG:
                //结束某个结点
                if ("app".equals(tagName)) {
                    Log.d(TAG, "pullXML: id=" + id);
                    Log.d(TAG, "pullXML: version=" + version);
                    Log.d(TAG, "pullXML: name=" + name);
                }
                break;
            default:
                break;
        }

        //继续向前解析
        eventType = xmlPullParser.next();
    }
}

2.SAX解析

• 自定义ContentHandler,实现解析逻辑

public class MySAXXml extends DefaultHandler {
    private static final String TAG = "MySAXXml";

    private String tagName;

    private StringBuilder id;
    private StringBuilder version;
    private StringBuilder name;

    /**
     * 文档开始
     *
     * @throws SAXException
     */
    @Override
    public void startDocument() throws SAXException {
        super.startDocument();
//        Log.d(TAG, "startDocument: ");

        id = new StringBuilder();
        version = new StringBuilder();
        name = new StringBuilder();
    }

    /**
     * 文档结束
     *
     * @throws SAXException
     */
    @Override
    public void endDocument() throws SAXException {
        super.endDocument();
//        Log.d(TAG, "endDocument: ");
    }

    /**
     * 元素开始
     *
     * @param uri
     * @param localName
     * @param qName
     * @param attributes
     * @throws SAXException
     */
    @Override
    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
        super.startElement(uri, localName, qName, attributes);
//        Log.d(TAG, "startElement: ");

        //记录当前结点名
        tagName = localName;
    }

    /**
     * 元素结束
     *
     * @param uri
     * @param localName
     * @param qName
     * @throws SAXException
     */
    @Override
    public void endElement(String uri, String localName, String qName) throws SAXException {
        super.endElement(uri, localName, qName);
//        Log.d(TAG, "endElement: ");

        if ("app".equals(localName)) {
            Log.d(TAG, "endElement: id=" + id.toString());
            Log.d(TAG, "endElement: version=" + version.toString());
            Log.d(TAG, "endElement: name=" + name.toString());

            //清空
            id.setLength(0);
            version.setLength(0);
            name.setLength(0);
        }
    }

    @Override
    public void characters(char[] ch, int start, int length) throws SAXException {
        super.characters(ch, start, length);
//        Log.d(TAG, "characters: ");
        if ("id".equals(tagName)) {
            id.append(ch, start, length);
        } else if ("version".equals(tagName)) {
            version.append(ch, start, length);
        } else if ("name".equals(tagName)) {
            name.append(ch, start, length);
        }

    }
}

• 测试

/**
 * sax方式解析
 */
private void saxXML() throws ParserConfigurationException, SAXException, IOException {

    //创建SAX解析工厂
    SAXParserFactory factory = SAXParserFactory.newInstance();

    //得到XMLReader
    XMLReader xmlReader = factory.newSAXParser().getXMLReader();

    //设置自定义的Handler
    xmlReader.setContentHandler(new MySAXXml());

    //要解析的对象
    String in = "\n" +
            "\t\n" +
            "\t\t1\n" +
            "\t\t1.0\n" +
            "\t\tqq\n" +
            "\t\n" +
            "\t\n" +
            "\t\t2\n" +
            "\t\t2.0\n" +
            "\t\tweixin\n" +
            "\t\n" +
            "";
    
    //设置解析资源并执行解析
    xmlReader.parse(new InputSource(new StringReader(in)));
}