Android Dom和XmlPullParse解析XML文件
最近在在XML解析,测试了DOM和XmlPullParse两种模式解析XML,记录下来!
首先,创建在Sdcard里创建Xml文件,然后,建立两个按钮分别使用DOM、XmlPullParse来解析Xml文件,并且分别显示在TextView中.
废话少说,先上效果图:
1,XmlPullParse使用基础:
1.1获取XmlPullParse
1 XmlPullParserFactory factory =XmlPullParserFactory.newInstance(); 2 XmlPullParser xmlPullParser =factory.newPullParser();
1.2 设置XmlPullParse解析器的输入
1 this.getClass().getClassLoader(); 2 xmlPullParser.setInput(ClassLoader.getSystemResourceAsStream(BOOKS_PATH),"UTF-8");
1.3 解析XML文档数据.其主要工作就是调用XmlPullParser.next()获取数据，然后再调用XmlPullParser.getEventType()得到当前解析状态再做相应的处理
1 int eventType = parser.getEventType(); //返回的状态类型 2 if (eventType == XmlPullParser.START_DOCUMENT) //XML文档开始 3 if (eventType == XmlPullParser.START_TAG) //开始读取某个标签 4 if (eventType == XmlPullParser.END_TAG) //结束读取某个标签 5 //TEXT：Text内容 6 if (eventType == XmlPullParser.END_DOCUMENT) //XML文档结束
2.布局文件,三个Button,两个TextView,代码如下:
1 <?xml version="1.0" encoding="utf-8"?> 2 <LinearLayout 3 xmlns:android="http://schemas.android.com/apk/res/android" 4 android:layout_width="match_parent" 5 android:layout_height="match_parent" 6 android:orientation="vertical"> 7 8 <Button 9 android:id="@+id/create_xml" 10 android:layout_width="match_parent" 11 android:layout_height="40dp" 12 android:text="创建XML文件"/> 13 14 <Button 15 android:id="@+id/dom_xml" 16 android:layout_width="match_parent" 17 android:layout_height="40dp" 18 android:text="DOM解析XML"/> 19 20 <Button 21 android:id="@+id/pull_xml" 22 android:layout_width="match_parent" 23 android:layout_height="40dp" 24 android:text="XmlPullParse解析XML"/> 25 26 <TextView 27 android:id="@+id/dom_text" 28 android:layout_width="match_parent" 29 android:layout_height="wrap_content" 30 android:textColor="@color/colorAccent" 31 android:textSize="18dip"/> 32 33 <TextView 34 android:id="@+id/pull_text" 35 android:layout_width="match_parent" 36 android:layout_height="wrap_content" 37 android:textColor="@color/colorPrimary" 38 android:textSize="18dip"/> 39 40 </LinearLayout>
3.主Activity:创建Xml文件,和Dom和XmlPullParse解析XMlL,代码如下:
1 package com.zwl.xmlparseproject; 2 3 import android.app.Activity; 4 import android.support.v7.app.AppCompatActivity; 5 import android.os.Bundle; 6 import android.util.Log; 7 import android.util.Xml; 8 import android.view.View; 9 import android.widget.Button; 10 import android.widget.TextView; 11 import android.widget.Toast; 12 13 import org.w3c.dom.Document; 14 import org.w3c.dom.Element; 15 import org.w3c.dom.Node; 16 import org.w3c.dom.NodeList; 17 import org.xml.sax.SAXException; 18 import org.xmlpull.v1.XmlPullParser; 19 import org.xmlpull.v1.XmlPullParserException; 20 import org.xmlpull.v1.XmlPullParserFactory; 21 import org.xmlpull.v1.XmlSerializer; 22 23 import java.io.File; 24 import java.io.FileNotFoundException; 25 import java.io.FileOutputStream; 26 import java.io.IOException; 27 28 import javax.xml.parsers.DocumentBuilder; 29 import javax.xml.parsers.DocumentBuilderFactory; 30 import javax.xml.parsers.ParserConfigurationException; 31 32 public class MainActivity extends Activity implements View.OnClickListener { 33 34 private static final String TAG = MainActivity.class.getSimpleName(); 35 private static final String BOOKS_PATH ="/sdcard/books.xml"; //创建books.xml文件路径 36 private Button mCreateXml,mDomXml,mPullXml; 37 private TextView mDemoText,mPullText; 38 39 @Override 40 protected void onCreate(Bundle savedInstanceState) { 41 super.onCreate(savedInstanceState); 42 setContentView(R.layout.activity_main); 43 setupViews(); 44 } 45 46 private void setupViews() { 47 mCreateXml =findViewById(R.id.create_xml); 48 mDomXml =findViewById(R.id.dom_xml); 49 mPullXml =findViewById(R.id.pull_xml); 50 mDemoText =findViewById(R.id.dom_text); 51 mPullText =findViewById(R.id.pull_text); 52 mCreateXml.setOnClickListener(this); 53 mDomXml.setOnClickListener(this); 54 mPullXml.setOnClickListener(this); 55 } 56 57 @Override 58 public void onClick(View v) { 59 switch (v.getId()){ 60 case R.id.create_xml: 61 Log.d(TAG,"create_xml"); 62 createXml(); 63 break; 64 case R.id.dom_xml: 65 Log.d(TAG,"dom_xml"); 66 domParseXML(); 67 break; 68 case R.id.pull_xml: 69 Log.d(TAG,"pull_xml"); 70 xmlPullParseXML(); 71 break; 72 default: 73 break; 74 } 75 } 76 77 //xmlPullParse解析Xml 78 private void xmlPullParseXML() { 79 String res="本结果通过XmlPullParse解析:"+"\n"; 80 try{ 81 XmlPullParserFactory factory =XmlPullParserFactory.newInstance(); 82 XmlPullParser xmlPullParser =factory.newPullParser(); 83 this.getClass().getClassLoader(); 84 xmlPullParser.setInput(ClassLoader.getSystemResourceAsStream(BOOKS_PATH),"UTF-8"); 85 int eventType =xmlPullParser.getEventType(); 86 try { 87 while (eventType!=XmlPullParser.END_DOCUMENT){ 88 String nodename =xmlPullParser.getName(); 89 switch (eventType){ 90 case XmlPullParser.START_TAG: 91 if ("bookname".equals(nodename)){ 92 res += "书名:"+xmlPullParser.nextText()+""; 93 }else if ("bookauthor".equals(nodename)){ 94 res +="作者:"+xmlPullParser.nextText()+"\n"; 95 } 96 break; 97 default: 98 break; 99 } 100 eventType =xmlPullParser.next(); 101 } 102 } catch (IOException e) { 103 e.printStackTrace(); 104 } 105 } catch (XmlPullParserException e) { 106 e.printStackTrace(); 107 } 108 mPullText.setText(res); 109 Toast.makeText(MainActivity.this, "XmlPullParser解析成功", Toast.LENGTH_SHORT).show(); 110 } 111 112 //dom解析XML文件 113 private void domParseXML() { 114 File file=new File(BOOKS_PATH); 115 DocumentBuilderFactory dbf =DocumentBuilderFactory.newInstance(); 116 DocumentBuilder db =null; 117 try{ 118 db =dbf.newDocumentBuilder(); 119 } catch (ParserConfigurationException e) { 120 e.printStackTrace(); 121 } 122 Document document =null; 123 try{ 124 document =db.parse(file); 125 } catch (SAXException e) { 126 e.printStackTrace(); 127 } catch (IOException e) { 128 e.printStackTrace(); 129 } 130 Element root =document.getDocumentElement(); 131 NodeList books =root.getElementsByTagName("book"); 132 String res ="本结果是通过dom解析的:"+"\n"; 133 for (int i=0 ; i<books.getLength();i++){ 134 Node book = books.item(i); 135 Node bookname=((org.w3c.dom.Element) book).getElementsByTagName("bookname").item(0); 136 Node bookauthor=((org.w3c.dom.Element) book).getElementsByTagName("bookauthor").item(0); 137 res += "书名:"+bookname.getFirstChild().getNodeValue()+""+ 138 "作者:"+bookauthor.getFirstChild().getNodeValue()+"\n"; 139 } 140 mDemoText.setText(res); 141 Toast.makeText(MainActivity.this, "解析成功", Toast.LENGTH_SHORT).show(); 142 } 143 144 //创建XML文件 145 private void createXml() { 146 File file =new File(BOOKS_PATH); 147 try{ 148 file.createNewFile(); 149 } catch (IOException e) { 150 e.printStackTrace(); 151 Toast.makeText(MainActivity.this, "exception in createnewfile() method", Toast.LENGTH_SHORT).show(); 152 } 153 FileOutputStream fileOutputStream = null; 154 try { 155 fileOutputStream =new FileOutputStream(file); 156 } catch (FileNotFoundException e) { 157 e.printStackTrace(); 158 Toast.makeText(MainActivity.this, "can‘t create file fileoutputStream", Toast.LENGTH_SHORT).show(); 159 } 160 XmlSerializer serializer = Xml.newSerializer(); 161 try { 162 serializer.setOutput(fileOutputStream,"UTF-8"); 163 serializer.startDocument(null,true); 164 serializer.startTag(null,"books"); 165 for (int i=0 ;i<3;i++){ 166 serializer.startTag(null,"book"); 167 serializer.startTag(null,"bookname"); 168 serializer.text("Android测试"+i); 169 serializer.endTag(null,"bookname"); 170 serializer.startTag(null,"bookauthor"); 171 serializer.text("xiaoshu"+i); 172 serializer.endTag(null,"bookauthor"); 173 serializer.endTag(null,"book"); 174 } 175 serializer.endTag(null,"books"); 176 serializer.endDocument(); 177 serializer.flush(); 178 fileOutputStream.close(); 179 } catch (IOException e) { 180 e.printStackTrace(); 181 } 182 Toast.makeText(MainActivity.this, "创建xml文件成功", Toast.LENGTH_SHORT).show(); 183 } 184 }
4. 由于我们在Sd卡上新建了文件，需要在AndroidManifest.xml里增加权限
1 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> //内外置SD卡写权限
完毕,全部代码如上.