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