使用Pull解析器生成XML文件和读取xml文件

有些时候，我们需要生成一个XML文件，生成XML文件的方法有很多，如：可以只使用一个StringBuilder组拼XML内容，然后把内容写入到文件中；或者使用DOM API生成XML文件，或者也可以使用pull解析器生成XML文件，这里推荐大家使用Pull解析器。

一、布局界面

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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

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"

tools:context=".MainActivity" >

<Button

android:id="@+id/btn_pull"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentLeft="true"

android:layout_alignParentRight="true"

android:layout_alignParentTop="true"

android:layout_marginTop="110dp"

android:text="@string/btn_pull" />

<Button

android:id="@+id/btn_write"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignLeft="@+id/btn_pull"

android:layout_alignRight="@+id/btn_pull"

android:layout_below="@+id/btn_pull"

android:layout_marginTop="61dp"

android:text="@string/btn_write" />

</RelativeLayout>



二、写一个xml文件

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<?xml version="1.0" encoding="UTF-8"?>

<persons>

<person id="23">

<name>李明</name>

<age>30</age>

</person>

<person id="20">

<name>李向梅</name>

<age>25</age>

</person>

</persons>

三、写一个和xml相对应的bean

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package com.example.lession04_pull.domain;

import java.io.Serializable;

public class Person implements Serializable{

/**

*

*/

private static final long serialVersionUID = 1L;

private int id;

private String name;

private short age;

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public short getAge() {

return age;

}

public void setAge(short age) {

this.age = age;

}

public Person(int id, String name, short age) {

super();

this.id = id;

this.name = name;

this.age = age;

}

public Person() {

super();

// TODO Auto-generated constructor stub

}

}

四、写一个Pul的服务类

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package com.example.lession04_pull.service;

import java.io.File;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.util.ArrayList;

import java.util.List;

import org.xmlpull.v1.XmlPullParser;

import org.xmlpull.v1.XmlSerializer;

import android.os.Environment;

import android.util.Xml;

import com.example.lession04_pull.domain.Person;

public class PullXmlService {

public Person currentPerson;

public List<Person> readXml(InputStream is){

//声明返回值

List<Person> persons=null;

//首先利用Xml.newPullParser()获取解析对象

XmlPullParser xmlPullParser=Xml.newPullParser();

try{

// 解析文件

xmlPullParser.setInput(is, "UTF-8");

//获取解析的事件类型

int eventType=xmlPullParser.getEventType();

//判断文件解析的是否完毕

while(eventType!=XmlPullParser.END_DOCUMENT){

switch (eventType) {

case XmlPullParser.START_DOCUMENT:

persons=new ArrayList<Person>();

break;

case XmlPullParser.START_TAG:

String tagName=xmlPullParser.getName();

if("person".equals(tagName)){

//创建person对象

currentPerson=new Person();

currentPerson.setId(Integer.parseInt(xmlPullParser

.getAttributeValue(null, "id")));

}else if("name".equals(tagName)){

currentPerson.setName(xmlPullParser.nextText());

}else if("age".equals(tagName)){

currentPerson.setAge(new Short(xmlPullParser.nextText()));

}

break;

case XmlPullParser.END_TAG:

if("person".equals(xmlPullParser.getName()) && currentPerson!=null){

//把person对象放到集合中去

persons.add(currentPerson);

currentPerson=null;

}

break;

}

eventType=xmlPullParser.next();

}

is.close();

}catch(Exception e){

e.printStackTrace();

}

return persons;

}

// 写入

public boolean write(List<Person> persons) {

// 采用pull解析进行实现

if (Environment.getExternalStorageState().equals(

Environment.MEDIA_MOUNTED)) {

// 获取sdcard目录 文件对象

File sdCardDir = Environment.getExternalStorageDirectory();

// 创建文件

File file = new File(sdCardDir, "mycsdn.xml");

XmlSerializer serializer = Xml.newSerializer();

FileOutputStream fos = null;

try {

// 根据文件对象创建一个文件的输出流对象

fos = new FileOutputStream(file);

// 设置输出的流及编码

serializer.setOutput(fos, "UTF-8");

// 设置文件的开始

serializer.startDocument("UTF-8", true);

// persons标签开始

serializer.startTag(null, "persons");

for (Person person : persons) {

// person标签的开始

serializer.startTag(null, "person");

// 设置person标签的属性

serializer.attribute("null", "id", person.getId() + "");

// 设置person标签的子标签 name

serializer.startTag(null, "name");

serializer.text(person.getName());

serializer.endTag(null, "name");

// 设置person标签的子标签的age

serializer.startTag(null, "age");

serializer.text(person.getAge() + "");

serializer.endTag(null, "age");

// person标签的结束

serializer.endTag(null, "person");

}

// persons标签的结束

serializer.endTag(null, "persons");

// 文件的结束

serializer.endDocument();

fos.flush();

fos.close();

return true;

} catch (Exception e) {

e.printStackTrace();

}

}

return false;

}

}

五、在MainActivity中调用测试

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package com.example.lession04_pull;

import java.util.List;

import com.example.lession04_pull.domain.Person;

import com.example.lession04_pull.service.PullXmlService;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.view.View;

import android.widget.Button;

import android.widget.Toast;

public class MainActivity extends Activity {

public Button btn_pull,btn_write;

public PullXmlService pullXmlService;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

//实例化

pullXmlService=new PullXmlService();

btn_pull=(Button) findViewById(R.id.btn_pull);

btn_write=(Button) findViewById(R.id.btn_write);

btn_pull.setOnClickListener(new MyOnClickListener());

btn_write.setOnClickListener(new MyOnClickListener());

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

class MyOnClickListener implements View.OnClickListener{

@Override

public void onClick(View v) {

int id=v.getId();

switch (id) {

case R.id.btn_pull:

List<Person> persons=null;

try{

persons=pullXmlService.readXml(getAssets().open("csdn.xml"));

}catch(Exception e){

e.printStackTrace();

}

if(persons!=null){

Toast.makeText(MainActivity.this, "采用pull解析xml文件"+persons.get(0).getName()+"--"+persons.get(1).getName(),

Toast.LENGTH_LONG).show();

}

break;

case R.id.btn_write:

try{

List<Person> pers=pullXmlService.readXml(getAssets().open("csdn.xml"));

//重新生成一个xml文件 mysdcare.xml

boolean flag=pullXmlService.write(pers);

if(flag){

Toast.makeText(MainActivity.this, "采用pull解析生产xml文件成功",

Toast.LENGTH_LONG).show();

}else{

Toast.makeText(MainActivity.this, "采用pull解析生产xml文件失败",

Toast.LENGTH_LONG).show();

}

}catch(Exception e){

e.printStackTrace();

}

break;

}

}

}

}

http://blog.csdn.net/xueshuangshuang123/article/details/9016161