XML数据网络加载与解析-优快云博客

网络下载

package com.jj.day14_pull_sax_dom;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

/**
 * Created by jj on 2018/1/10.
 */

public class HttpUtils {
    public static String getFromJson(String path){
        try {
            URL url=new URL(path);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.connect();
            if (conn.getResponseCode()==200){
                InputStream is=conn.getInputStream();
                ByteArrayOutputStream os=new ByteArrayOutputStream();
                int len=0;
                byte[] b=new byte[1024];
                while ((len=is.read(b))!=-1){
                    os.write(b,0,len);
                }
                return os.toString();
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return null;
    }
}

Activity

package com.animee.day13.xml_test;

import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

import com.animee.day13.R;

import java.io.IOException;

public class TestActivity extends AppCompatActivity {

    private TextView tv;
    public String url = "http://www.w3school.com.cn/example/xmle/note.xml";
    public String TAG = "TestActivity";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test);
        tv = (TextView) findViewById(R.id.tv);
        loadData(url);
    }

    private void loadData(final String url) {
        new AsyncTask<Void,Void,String>(){
            @Override
            protected String doInBackground(Void... params) {
                try {
                    return  HttpUtils.getStringContent(url);
                } catch (IOException e) {
                    e.printStackTrace();
                }
                return null;
            }

            @Override
            protected void onPostExecute(String s) {
                if (s!=null&&!s.isEmpty()) {
                    Log.i(TAG, "onPostExecute: s＝＝＝"+s);
//                    解析xml文件
                    Note note = XMLTest.parseXML(s);
                    Log.i(TAG, "onPostExecute: note==="+note.toString());
                    tv.setText(note.toString());
                }

            }
        }.execute();
    }
}

实体类

package com.animee.day13.xml_test;

/**
 * Created by Administrator on 2018/1/10.
 * <to>George</to>
 <from>John</from>
 <heading>Reminder</heading>
 <body>Don't forget the meeting!</body>
 */

public class Note {
    private String to;
    private String from;
    private String heading;
    private String body;

    @Override
    public String toString() {
        return "Note{" +
                "to='" + to + '\'' +
                ", from='" + from + '\'' +
                ", heading='" + heading + '\'' +
                ", body='" + body + '\'' +
                '}';
    }

    public Note() {
    }

    public Note(String to, String from, String heading, String body) {
        this.to = to;
        this.from = from;
        this.heading = heading;
        this.body = body;
    }

    public String getTo() {
        return to;
    }

    public void setTo(String to) {
        this.to = to;
    }

    public String getFrom() {
        return from;
    }

    public void setFrom(String from) {
        this.from = from;
    }

    public String getHeading() {
        return heading;
    }

    public void setHeading(String heading) {
        this.heading = heading;
    }

    public String getBody() {
        return body;
    }

    public void setBody(String body) {
        this.body = body;
    }
}

解析XML

package com.animee.day13.xml_test;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserFactory;

import java.io.ByteArrayInputStream;

/**
 * Created by Administrator on 2018/1/10.
 */

public class XMLTest {

    public static Note parseXML(String s){
        try {
//            1获取Pull解析工厂类对象
            XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
//           2.获取pull解析类对象
            XmlPullParser pullParser = factory.newPullParser();
            byte[]buf = s.getBytes();
            ByteArrayInputStream bais = new ByteArrayInputStream(buf);
//           3.设置要被解析的数据源
            pullParser.setInput(bais,"utf-8");
//            4.获取标签的响应码
            int code = pullParser.getEventType();
            Note note = new Note();
//          5.循环判断，并解析每一个节点
            while (code != XmlPullParser.END_DOCUMENT) {
				//获取正在被解析的标签的名称
                String name = pullParser.getName();
				//判断正在被解析的是开始标签还是结束标签
                switch (code) {
                    case XmlPullParser.START_TAG:
                        if (name.equals("to")) {
                            note.setTo(pullParser.nextText());
                        }else if (name.equals("from")) {
                            note.setFrom(pullParser.nextText());
                        }else if (name.equals("heading")) {
                            note.setHeading(pullParser.nextText());
                        }else if (name.equals("body")) {
                            note.setBody(pullParser.nextText());
                        }
                        break;
                }
				//移动指针到下一个标签
                code = pullParser.next();
            }
            return note;

        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }


}

布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main"
    android:layout_width="match_parent" android:layout_height="match_parent"
    tools:context="com.jj.day14_pull_sax_dom.MainActivity">

    <TextView
        android:id="@+id/tv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="18sp"/>
</RelativeLayout>