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使用SAX方式解析XML文件

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互联网集市收集整理的这篇技术教程文章主要介绍了使用SAX方式解析XML文件，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含4002字，纯文字阅读大概需要6分钟。

内容图文

            package
             com.pingyijinren.test;


            import
             android.util.Log;


            import
             org.xml.sax.Attributes;

            import
             org.xml.sax.SAXException;

            import
             org.xml.sax.helpers.DefaultHandler;


            /**
            
 * Created by Administrator on 2016/5/19 0019.
 
            */
            public
            class ContentHandler extends DefaultHandler {
    private String nodeName;
    private StringBuilder id;
    private StringBuilder name;
    private StringBuilder version;

    @Override
    publicvoid startDocument() throws SAXException{
        id=new StringBuilder();
        name=new StringBuilder();
        version=new StringBuilder();
    }

    @Override
    publicvoid startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException{
        nodeName=localName;
    }

    @Override
    publicvoid characters(char[] ch,int start,int length) throws SAXException{
        if(nodeName.equals("id")){
            id.append(ch,start,length);
        }
        elseif(nodeName.equals("name")){
            name.append(ch,start,length);
        }
        elseif(nodeName.equals("version")){
            version.append(ch,start,length);
        }
    }

    @Override
    publicvoid endElement(String uri,String localName,String qName) throws SAXException{
        if(localName.equals("app")){
            Log.d("MainActivity","id is "+id.toString().trim());
            Log.d("MainActivity","name is "+name.toString().trim());
            Log.d("MainActivity","version is "+version.toString().trim());

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

    @Override
    publicvoid endDocument() throws SAXException{}
}
            package
             com.pingyijinren.test;


            import
             android.content.Intent;

            import
             android.os.Handler;

            import
             android.os.Message;

            import
             android.support.v7.app.AppCompatActivity;

            import
             android.os.Bundle;

            import
             android.util.Log;

            import
             android.view.View;

            import
             android.widget.Button;

            import
             android.widget.TextView;


            import
             org.apache.http.HttpEntity;

            import
             org.apache.http.HttpResponse;

            import
             org.apache.http.client.HttpClient;

            import
             org.apache.http.client.methods.HttpGet;

            import
             org.apache.http.impl.client.DefaultHttpClient;

            import
             org.apache.http.util.EntityUtils;

            import
             org.xml.sax.InputSource;

            import
             org.xml.sax.XMLReader;

            import
             org.xmlpull.v1.XmlPullParser;

            import
             org.xmlpull.v1.XmlPullParserFactory;


            import
             java.io.BufferedReader;

            import
             java.io.EOFException;

            import
             java.io.InputStream;

            import
             java.io.InputStreamReader;

            import
             java.io.StringReader;

            import
             java.net.HttpURLConnection;

            import
             java.net.URL;


            import
             javax.xml.parsers.SAXParserFactory;


            public
            class MainActivity extends AppCompatActivity{
    private Button button;
    private TextView textView;
    privatestaticfinalint SHOW_RESPONSE=0;
    private Handler handler=new Handler(){
        publicvoid handleMessage(Message message){
            switch(message.what){
                case SHOW_RESPONSE:
                    String response=(String)message.obj;
                    textView.setText(response);
            }
        }
    };
    @Override
    protectedvoid onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        button=(Button)findViewById(R.id.button);
        textView=(TextView)findViewById(R.id.textView);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            publicvoid onClick(View v) {
                sendRequestWithHttpURLConnection();
            }
        });
    }

    privatevoid sendRequestWithHttpURLConnection(){
        new Thread(new Runnable(){
            @Override
            publicvoid run(){
                try{
                    HttpClient httpClient = new DefaultHttpClient();
                    HttpGet httpGet=new HttpGet("http://172.29.209.1/get_data.xml");
                    HttpResponse httpResponse=httpClient.execute(httpGet);
                    if(httpResponse.getStatusLine().getStatusCode()==200){
                        HttpEntity httpEntity=httpResponse.getEntity();
                        String response= EntityUtils.toString(httpEntity,"utf-8");

                        Log.d("MainActivity",response);

                        parseXMLWithSAX(response);
                    }
                }
                catch(Exception e){
                    e.printStackTrace();
                }


            }
        }).start();
    }

    privatevoid parseXMLWithSAX(String xmlData){
        try{
            SAXParserFactory factory=SAXParserFactory.newInstance();
            XMLReader xmlReader=factory.newSAXParser().getXMLReader();
            ContentHandler handler=new ContentHandler();
            xmlReader.setContentHandler(handler);
            xmlReader.parse(new InputSource(new StringReader(xmlData)));
        }
        catch(Exception e){
            e.printStackTrace();
        }
    }
}

 

原文：http://www.cnblogs.com/zqxLonely/p/5508245.html

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