使用pull方式和sax方式对xml文件进行解析

Posted 2020-11-06 dengmin111

这是我自己设置的xml文件

用一下方式获取它的内容

try{
    OkHttpClient client = new OkHttpClient();
    Request request = new Request.Builder()
　　　　　　　//对于虚拟机而言的本地地址
            .url("http://10.0.2.2/get_data.xml")
            .build();
    Response response =client.newCall(request).execute();
    String responseData = response.body().string();
}catch (Exception e){
    e.printStackTrace();
}

首先是pull方式

　xmlData是获取到的xml文件内容　

private void parseXMLWithPull(String xmlData){
    try{
        Log.i(TAG, "parseXMLWithPull: ");
        XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
        XmlPullParser xmlPullParser = factory.newPullParser();
        xmlPullParser.setInput(new StringReader(xmlData));
        int eventType = xmlPullParser.getEventType();
        String id ="";
        String name = "";
        String version = "";
        while (eventType != XmlPullParser.END_DOCUMENT){
            String nodeName = xmlPullParser.getName();
            switch (eventType){
                //开始解析某个节点
                case XmlPullParser.START_TAG:{
                    switch (nodeName){
                        case "id":
                            id = xmlPullParser.nextText();
                            break;
                        case "name":
                            name = xmlPullParser.nextText();
                            break;
                        case "version":
                            version = xmlPullParser.nextText();
                            break;
                        default:
                            break;
                    }
                    break;
                }
                //结束解析某个节点
                case XmlPullParser.END_TAG:{
                    if("app".equals(nodeName)){
                        Log.i(TAG, "id: "+id);
                        Log.i(TAG, "name: "+name);
                        Log.i(TAG, "version: "+version);
                    }
                    break;
                }
                default:
                    break;
            }
            eventType = xmlPullParser.next();
        }
    }catch (Exception e){
        e.printStackTrace();
    }
}

然后是Sax方式，这种方式需要新建一个类并使它继承defaultHandler类

public class MyHandler extends DefaultHandler{
    private String nodeName;
    private StringBuilder id;
    private StringBuilder name;
    private StringBuilder version;
//开始解析xml时调用
    @Override
    public void startDocument() throws SAXException {
        id = new StringBuilder();
        name = new StringBuilder();
        version = new StringBuilder();
    }
//开始解析某个节点时调用
    @Override
    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
        nodeName = localName;
        //记录当前节点名
    }
//获取节点内容时调用
    @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);
            }
                
        }
    }

    @Override
    public void endElement(String uri, String localName, String qName) throws SAXException {
        if("app".equals(nodeName)){
            Log.i("ContentHandler", "id: "+id.toString().trim());
            Log.i("ContentHandler", "name: "+name.toString().trim());
            Log.i("ContentHandler", "version: "+version.toString().trim());
            //清空StringBuilder
            id.setLength(0);
            name.setLength(0);
            version.setLength(0);
        }
    }

    @Override
    public void endDocument() throws SAXException {
        super.endDocument();
    }
}