Android-解析XML(DOM解析,SAX解析，PULL解析)

解析网络XML

第一步：需在项目的根目录下面配置网络权限

<uses-permission android:name="android.permission.INTERNET"/>

第二部：写一个简单的布局文件

<?xml version="1.0" encoding="utf-8"?><LinearLayout 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"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    android:orientation="vertical"    tools:context="com.asus.android_29_parsexml.MainActivity">    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="解析XML"        android:onClick="parseXML"        /></LinearLayout>

第三部：在MainActivity解析XML(三种方式)

package com.asus.android_29_parsexml;import android.os.AsyncTask;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.util.Xml;import android.view.View;import org.w3c.dom.Document;import org.w3c.dom.Element;import org.w3c.dom.Node;import org.w3c.dom.NodeList;import org.xml.sax.Attributes;import org.xml.sax.SAXException;import org.xml.sax.helpers.DefaultHandler;import org.xmlpull.v1.XmlPullParser;import org.xmlpull.v1.XmlPullParserException;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import javax.xml.parsers.DocumentBuilder;import javax.xml.parsers.DocumentBuilderFactory;import javax.xml.parsers.ParserConfigurationException;import javax.xml.parsers.SAXParser;import javax.xml.parsers.SAXParserFactory;public class MainActivity extends AppCompatActivity {    private String cuurentTag=null;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    public void parseXML(View view) {        //01.获取网络xml        new MyTask().execute();        //02.解析XML        //03.展示    }    class MyTask extends AsyncTask{        @Override        protected Object doInBackground(Object[] params) {            //原生态底层：            try {                URL url=new URL("http://192.168.43.231:8080/persons.xml");                HttpURLConnection connection= (HttpURLConnection) url.openConnection();                //设置请求方式‘                connection.setRequestMethod("GET");                //设置请求连接超时的时间（优化）                connection.setConnectTimeout(5000);                //获取结果码                int code=connection.getResponseCode();                if(code==200){                    //获取服务器返回过来的结果                    InputStream is=connection.getInputStream();                    //打印（读）--》测试//                    BufferedReader br=new BufferedReader(new InputStreamReader(is));//                    String str=null;//                    while((str=br.readLine())!=null){//                        Log.i("test",str);//                    }                    //解析//                    //01.使用DOM解析//                    DocumentBuilderFactory documentBuilderFactory=DocumentBuilderFactory.newInstance();//                    DocumentBuilder documentBuilder=documentBuilderFactory.newDocumentBuilder();//                    Document document=documentBuilder.parse(is);//                    //获取跟标签//                    Element root=document.getDocumentElement();//                    Log.i("test","根标签："+root.getNodeName());////                    //获取<persons>下面的所有的子标签<person>//                    NodeList nodeList=root.getElementsByTagName("person");//                    for (int i = 0; i <nodeList.getLength() ; i++) {//                        //获取单个//                        //Node//                        //Element//                        Element personElement= (Element) nodeList.item(i);//                        //获取<person>属性id的值//                        String id=personElement.getAttribute("id");//                        Log.i("test",id);////                        //获取<person>下面的子标签<name><age><image>的值//                        Element nameElement= (Element) personElement.getElementsByTagName("name").item(0);//                        String name=nameElement.getTextContent();//                        Element ageElement= (Element) personElement.getElementsByTagName("age").item(0);//                        String age=ageElement.getTextContent();////                        Log.i("test",name+" "+age);//                    }                    //02.SAX(边读边解析，基于事件（方法）驱动方式)//                    SAXParserFactory saxParserFactory=SAXParserFactory.newInstance();//                    SAXParser saxParser=saxParserFactory.newSAXParser();////                    saxParser.parse(is,new DefaultHandler(){//                        @Override//                        public void startDocument() throws SAXException {//                            super.startDocument();//                        }////                        @Override//                        public void endDocument() throws SAXException {//                            super.endDocument();//                        }////                        @Override//                        public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {//                            super.startElement(uri, localName, qName, attributes);//                            cuurentTag=localName;//                            //获取开始标签的名字//                            if("person".equals(localName)){//                                //取属性的值//                                String id=attributes.getValue(0);//                                Log.i("test",id);//                            }//////                        }////                        @Override//                        public void endElement(String uri, String localName, String qName) throws SAXException {//                            super.endElement(uri, localName, qName);//                            cuurentTag=null;//                        }////                        @Override//                        public void characters(char[] ch, int start, int length) throws SAXException {//                            super.characters(ch, start, length);//                            if("name".equals(cuurentTag)){//                                //获取<name>的值//                                String name=new String(ch,start,length);//                                Log.i("test", "   "+name);//                            }else if("age".equals(cuurentTag)){//                                //获取<name>的值//                                String age=new String(ch,start,length);//                                Log.i("test", "   "+age);//                            }//                        }//                    });                    //03.使用PULL解析（类似SAX）                    XmlPullParser xmlPullParser= Xml.newPullParser();                    xmlPullParser.setInput(is,"UTF-8");                    //获取解析的标签的类型                    int type=xmlPullParser.getEventType();                    while(type!=XmlPullParser.END_DOCUMENT){                        switch (type) {                            case XmlPullParser.START_TAG:                                //获取开始标签名字                                String starttagName=xmlPullParser.getName();                                if("person".equals(starttagName)){                                    //获取id的值                                    String id=xmlPullParser.getAttributeValue(0);                                    Log.i("test",id);                                }else if("name".equals(starttagName)){                                    String name=xmlPullParser.nextText();                                    Log.i("test",name);                                }else if("age".equals(starttagName)){                                    String age=xmlPullParser.nextText();                                    Log.i("test",age);                                }                                break;                            case XmlPullParser.END_TAG:                                break;                        }                        //细节：                        type=xmlPullParser.next();                    }                }            } catch (Exception e) {                e.printStackTrace();            }            return null;        }        @Override        protected void onPostExecute(Object o) {            super.onPostExecute(o);        }    }}

注：onPostExecute用于展示数据；