android中xml报文解析的两种方法dom树解析和xmlpull解析
1、dom树解析使用DocumentBuilder将传进来的file解析为一棵dom树 然后调用dom树的方法对其进行解析
2、xmlpull则获取输入流xml文件进行解析,这种方法下要建一个报文响应的bean类 进行解析对象的存储
具体代码如下:
XmlDemo.java
package com.example.xml; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.util.ArrayList; import java.util.List; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.NodeList; import org.xml.sax.SAXException; import org.xmlpull.v1.XmlPullParser; import org.xmlpull.v1.XmlPullParserException; import org.xmlpull.v1.XmlPullParserFactory; import org.xmlpull.v1.XmlSerializer; import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.util.Xml; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; public class XmlDemo extends Activity implements OnClickListener { private static final String BOOKS_PATH = "/sdcard/books.xml"; private Button mButton1, mButton2, mButton3; private TextView mTextView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // 对ui控件进行初始化和配置 setupViews(); } // 初始化工作 private void setupViews() { mTextView = (TextView) findViewById(R.id.result); mButton1 = (Button) findViewById(R.id.btn1); mButton2 = (Button) findViewById(R.id.btn2); mButton3 = (Button) findViewById(R.id.btn3); mButton1.setOnClickListener(this); mButton2.setOnClickListener(this); mButton3.setOnClickListener(this); } // 创建xml文件 private void createXmlFile() { File linceseFile = new File(BOOKS_PATH); try { linceseFile.createNewFile(); } catch (IOException e) { Log.e("IOException", "exception in createNewFile() method"); } FileOutputStream fileos = null; try { fileos = new FileOutputStream(linceseFile); } catch (FileNotFoundException e) { Log.e("FileNotFoundException", "can't create FileOutputStream"); } XmlSerializer serializer = Xml.newSerializer(); try { serializer.setOutput(fileos, "UTF-8"); serializer.startDocument(null, true); serializer.startTag(null, "books"); for (int i = 0; i < 3; i++) { serializer.startTag(null, "book"); serializer.startTag(null, "bookname"); serializer.text("Android教程" + i); serializer.endTag(null, "bookname"); serializer.startTag(null, "bookauthor"); serializer.text("Frankie" + i); serializer.endTag(null, "bookauthor"); serializer.endTag(null, "book"); } serializer.endTag(null, "books"); serializer.endDocument(); serializer.flush(); fileos.close(); } catch (Exception e) { Log.e("Exception", "error occurred while creating xml file"); } Toast.makeText(getApplicationContext(), "创建xml文件成功!", Toast.LENGTH_SHORT).show(); } // dom解析xml文件 private void domParseXML() { File file = new File(BOOKS_PATH); DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); DocumentBuilder db = null; try { db = dbf.newDocumentBuilder(); } catch (ParserConfigurationException e) { e.printStackTrace(); } Document doc = null; try { doc = db.parse(file); } catch (SAXException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } Element root = doc.getDocumentElement(); NodeList books = root.getElementsByTagName("book"); String res = "本结果是通过dom解析:" + "/n"; for (int i = 0; i < books.getLength(); i++) { Element book = (Element) books.item(i); Element bookname = (Element) book.getElementsByTagName("bookname") .item(0); Element bookauthor = (Element) book.getElementsByTagName( "bookauthor").item(0); res += "书名: " + bookname.getFirstChild().getNodeValue() + " " + "作者: " + bookauthor.getFirstChild().getNodeValue() + "/n"; } mTextView.setText(res); } // xmlPullParser解析xml文件 private List<Student> xmlPullParseXML() { String res = "本结果是通过XmlPullParse解析:" + "/n"; List<Student> list=null; Student student = null; //构建XmlPullParserFactory try { XmlPullParserFactory pullParserFactory=XmlPullParserFactory.newInstance(); //获取XmlPullParser的实例 XmlPullParser xmlPullParser=pullParserFactory.newPullParser(); //设置输入流 xml文件 xmlPullParser.setInput(Thread.currentThread().getContextClassLoader().getResourceAsStream("Student.xml"), "UTF-8"); //开始 int eventType=xmlPullParser.getEventType(); try { while(eventType!=XmlPullParser.END_DOCUMENT){ String nodeName=xmlPullParser.getName(); switch (eventType) { //文档开始 case XmlPullParser.START_DOCUMENT: list=new ArrayList<Student>(); break; //开始节点 case XmlPullParser.START_TAG: //判断如果其实节点为student if("student".equals(nodeName)){ //实例化student对象 student=new Student(); //设置Id属性 student.setId(Integer.parseInt(xmlPullParser.getAttributeValue(0))); //设置Group属性 student.setGroup(Integer.parseInt(xmlPullParser.getAttributeValue(1))); }else if("name".equals(nodeName)){ //设置name student.setName(xmlPullParser.nextText()); }else if("sex".equals(nodeName)){ //设置sex student.setSex(xmlPullParser.nextText()); }else if("age".equals(nodeName)){ //设置age student.setAge(Integer.parseInt(xmlPullParser.nextText())); }else if("email".equals(nodeName)){ //设置email student.setEmail(xmlPullParser.nextText()); }else if("birthday".equals(nodeName)){ //设置birthday student.setBirthday(xmlPullParser.nextText()); }else if("memo".equals(nodeName)){ //设置memo属性 student.setMemo(xmlPullParser.nextText()); } break; //结束节点 case XmlPullParser.END_TAG: if("student".equals(nodeName)){ list.add(student); student=null; } break; default: break; } eventType=xmlPullParser.next(); } } catch (NumberFormatException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } catch (XmlPullParserException e) { e.printStackTrace(); } String ss=""; for(Student students:list) { ss+="姓名:"+students.getName()+"年龄:"+students.getAge(); } mTextView.setText(res+ss); return list; } // 按钮事件响应 public void onClick(View v) { if (v == mButton1) { createXmlFile(); } else if (v == mButton2) { domParseXML(); } else if (v == mButton3) { xmlPullParseXML(); } } }
Student.java
package com.example.xml; public class Student { private int id; private int group; private String name; private String sex; private int age; private String email; private String memo; private String birthday; public int getId() { return id; } public void setId(int id) { this.id = id; } public int getGroup() { return group; } public void setGroup(int group) { this.group = group; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } public String getMemo() { return memo; } public void setMemo(String memo) { this.memo = memo; } public String getBirthday() { return birthday; } public void setBirthday(String birthday) { this.birthday = birthday; } }
activity_main.xml:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <Button android:id="@+id/btn1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="创建XML文件" /> <Button android:id="@+id/btn2" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="DOM解析XML" /> <Button android:id="@+id/btn3" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="XmlPullParse解析XML" /> <TextView android:id="@+id/result" android:layout_width="fill_parent" android:layout_height="wrap_content" /> </LinearLayout>
Student.xml
<?xml version="1.0" encoding="UTF-8"?> <root> <student id="1" group="1"> <name>llll</name> <sex>男</sex> <age>18</age> <email>zhangsan@163.com</email> <birthday>1987-06-08</birthday> <memo>收到的</memo> </student> <student id="2" group="2"> <name>sdfsf</name> <sex>Ů</sex> <age>18</age> <email>lisi@163.com</email> <birthday>1987-06-08</birthday> <memo>山东省</memo> </student> </root>
本例的界面注意:
点击创建可以创建一个xml文档,dom解析就对这个创建的xml进行解析。而xmlpullparse则是对上面给出的student.xml
进行解析的大家注意。别说我给的不能运行。哈哈