在Android中使用Sax解析本地XML文件

Question

谁能告诉我如何使用SAX解析存储在系统中的本地XML文件，并附带示例代码？ 还请告诉我在哪里可以找到相关信息。

Answer 1

要在应用程序中读取XML，请在项目内的res文件夹中创建一个名为“xml”的文件夹（小写）。 将xml存储在这个新创建的文件夹中。 要从资源加载XML，

XmlResourceParser myxml = mContext.getResources().getXml(R.xml.MyXml);//MyXml.xml is name of our xml in newly created xml folder, mContext is the current context
// Alternatively use: XmlResourceParser myxml = getContext().getResources().getXml(R.xml.MyXml);

myxml.next();//Get next parse event
int eventType = myxml.getEventType(); //Get current xml event i.e., START_DOCUMENT etc.

然后，您可以通过处理事件类型来开始处理节点，属性等和包含在其中的文本，一旦处理完成后调用myxml.next（）以获取下一个事件，即，

 String NodeValue;
    while (eventType != XmlPullParser.END_DOCUMENT)  //Keep going until end of xml document
    {  
        if(eventType == XmlPullParser.START_DOCUMENT)   
        {     
            //Start of XML, can check this with myxml.getName() in Log, see if your xml has read successfully
        }    
        else if(eventType == XmlPullParser.START_TAG)   
        {     
            NodeValue = myxml.getName();//Start of a Node
            if (NodeValue.equalsIgnoreCase("FirstNodeNameType"))
            {
                    // use myxml.getAttributeValue(x); where x is the number
                    // of the attribute whose data you want to use for this node

            }

            if (NodeValue.equalsIgnoreCase("SecondNodeNameType"))
            {
                    // use myxml.getAttributeValue(x); where x is the number
                    // of the attribute whose data you want to use for this node

            } 
           //etc for each node name
       }   
        else if(eventType == XmlPullParser.END_TAG)   
        {     
            //End of document
        }    
        else if(eventType == XmlPullParser.TEXT)   
        {    
            //Any XML text
        }

        eventType = myxml.next(); //Get next event from xml parser
    }

Answer 2

package com.xml;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import android.util.Log;
import android.widget.Toast;

public class FeedHandler extends DefaultHandler {

    StringBuilder sb = null;
    String ret = "";
    boolean bStore = false;
    int howMany = 0;

    FeedHandler() {   }

    String getResults()
    {
        return "XML parsed data.\nThere are [" + howMany + "] status updates\n\n" + ret;
    }
    @Override
    public void startDocument() throws SAXException 
    {
        // initialize "list"
    }

    @Override
    public void endDocument() throws SAXException
    {

    }

    @Override
    public void startElement(String namespaceURI, String localName, String qName, Attributes atts) throws SAXException {

        try {
            if (localName.equals("status"))
            {
                this.sb = new StringBuilder("");
                bStore = true;
            }
            if (localName.equals("user")) 
            {
                bStore = false;
            }
            if (localName.equals("text")) 
            {
                this.sb = new StringBuilder("");
                Log.i("sb ", sb+"");

            }
            if (localName.equals("created_at")) 
            {
                this.sb = new StringBuilder("");
            }
        } catch (Exception e) 
        {

            Log.d("error in startElement", e.getStackTrace().toString());
        }
    }
    @Override

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

        if (bStore) 
        {
            if (localName.equals("created_at"))
            {
                ret += "Date: " + sb.toString() + "\n"; 
                sb = new StringBuilder("");
                return;

            }

            if (localName.equals("user"))
            {
                bStore = true;
            }

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

                ret += "Post: " + sb.toString() + "\n\n";
                sb = new StringBuilder("");
                return;

            }


        }
        if (localName.equals("status"))
        {
            howMany++;
            bStore = false;
        }
    }
    @Override

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

        if (bStore) 
        {
//          System.out.println("start " +start+"length "+length);
            String theString = new String(ch, start, length);

            this.sb.append(theString+"start "+start+" length "+length);
        }
    }

}

InputSource is = new InputSource(getResources().openRawResource(R.raw.my));
                System.out.println("running xml file..... ");
            // create the factory
            SAXParserFactory factory = SAXParserFactory.newInstance();

            // create a parser
            SAXParser parser = factory.newSAXParser();

            // create the reader (scanner)
            XMLReader xmlreader = parser.getXMLReader();

            // instantiate our handler
            FeedHandler fh = new FeedHandler();

            // assign our handler
            xmlreader.setContentHandler(fh);

            // perform the synchronous parse
            xmlreader.parse(is);

            // should be done... let's display our results
            tvData.setText(fh.getResults());

Answer 3

示例代码

1. 创建documentBuilderFactory

   DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance（）;

   1. 创建DocumentBuilder

   DocumentBuilder builder = factory。 newDocumentBuilder（）;

   1. 获取输入流ClassLoader cls = DomReader.class.getClassLoader（）; InputStream是= cls.getResourceAsStream（“xml file”）;
      1. 解析xml文件并通过调用DocumentBuilder对象上的parse方法获取Document对象。 Document document = builder.parse（is）;
      2. 使用文档对象遍历dom树。 SAX：简单的xml解析。 它逐节点解析遍历从上到下低内存使用sax不支持后退导航。

   //实现必需的处理程序public class SaxParse extends DefaultHandler {} // saxParserFactory的新实例SAXParserFactory factory = SAXParserFactory.newInstance（）; // SAX PARSER的新实例SAXParser saxparser = factory.newSAXParser（）; //解析xml文档SAXParser.parse（新文件（要解析的文件），新的SAXXMLParserImpl（））;