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android(14)_解析xml文件1_pull

編輯：關於Android編程

除了可以使用 SAX和DOM解析XML文件，大家也可以使用Android內置的Pull解析器解析XML文件。

Pull解析器的運行方式與 SAX 解析器相似。

它提供了類似的事件，如：開始元素和結束元素事件，使用parser.next()可以進入下一個元素並觸發相應事件。

事件將作為數值代碼被發送，因此可以使用一個switch對感興趣的事件進行處理。

當元素開始解析時，調用parser.nextText()方法可以獲取下一個Text類型元素的值。

Strings.xml
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<?xml version="1.0" encoding="utf-8"?>
<resources>

 <string name="app_name">lession03_xml</string>
 <string name="action_settings">Settings</string>
 <string name="hello_world">Hello world!</string>
 <string name="btn_sax">采用sax解析xml文件</string>
 <string name="btn_dom">采用dom解析方式解析</string>
 <string name="btn_pull">采用pull解析方式解析</string>
 <string name="btn_cpull">采用pull解析生成xml文件</string>

</resources>

<?xml version="1.0" encoding="utf-8"?>
<resources>

<string name="app_name">lession03_xml</string>
 <string name="action_settings">Settings</string>
 <string name="hello_world">Hello world!</string>
 <string name="btn_sax">采用sax解析xml文件</string>
 <string name="btn_dom">采用dom解析方式解析</string>
 <string name="btn_pull">采用pull解析方式解析</string>
 <string name="btn_cpull">采用pull解析生成xml文件</string>

</resources>

activity_xml.xml
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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=".XmlActivity" >

 <Button
 android:id="@+id/button_cpull"
 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="20dp"
 android:text="@string/btn_cpull" />

 <Button
 android:id="@+id/btn_sax"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_alignParentLeft="true"
 android:layout_alignParentRight="true"
 android:text="@string/btn_sax" />

 <Button
 android:id="@+id/btn_pull"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_alignLeft="@+id/btn_dom"
 android:layout_alignRight="@+id/btn_dom"
 android:layout_below="@+id/btn_dom"
 android:layout_marginTop="68dp"
 android:text="@string/btn_pull" />

 <Button
 android:id="@+id/btn_dom"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_alignLeft="@+id/btn_sax"
 android:layout_alignRight="@+id/btn_sax"
 android:layout_below="@+id/btn_sax"
 android:layout_marginTop="60dp"
 android:text="@string/btn_dom" />

</RelativeLayout>

</RelativeLayout>

Person.java
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package com.example.lession03_xml.domain;

import java.io.Serializable;

/**
* 創建一個javabean存儲xml解析的數據
*
* @author chenhj
*
*/
public class Person implements Serializable {

    /**
         *
         */
    private static final long serialVersionUID = 1L;
    private int id;
    private String name;
    private short age;

    public Person() {
        super();
        // TODO Auto-generated constructor stub
    }

    public Person(int id, String name, short age) {
        super();
        this.id = id;
        this.name = name;
        this.age = 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;
    }

}

package com.example.lession03_xml.domain;

import java.io.Serializable;

/**
* 創建一個javabean存儲xml解析的數據
*
* @author chenhj
*
*/
public class Person implements Serializable {

/**
*
*/
private static final long serialVersionUID = 1L;
private int id;
private String name;
private short age;

public Person() {
super();
// TODO Auto-generated constructor stub
}

public Person(int id, String name, short age) {
  super();
  this.id = id;
  this.name = name;
  this.age = 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;
}

}

XMLPullService.java
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package com.example.lession03_xml.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.R.bool;
import android.os.Environment;
import android.provider.ContactsContract.CommonDataKinds.Event;
import android.util.Xml;

import com.example.lession03_xml.domain.Person;

/**
* 采用pull解析xml文件事件驅動開始,結束元素事件產生的事件是一個數字,通過switch語句體現
*
* @author zhaoyazhi
*
*/
public class XMLPullService {
 public List<Person> getPerson(InputStream inputStream) throws Exception {
 List<Person> persons = null;
 Person person = null;

 // android提供一個類XmlPullParser,得到pull解析器
 XmlPullParser pullParser = Xml.newPullParser();
 // 設置要進行解析的內容,不是立刻發生,調用才發生
 pullParser.setInput(inputStream, "utf-8");

 /* <?xml version="1.0" encoding="UTF-8"?> */
 // 觸發第一個事件用數字形式表示開始文檔事件
 int event = pullParser.getEventType();
 // 不等於文檔的結束時間
 while (event != XmlPullParser.END_DOCUMENT) {
 // 屬於開始文檔事件
 switch (event) {

 case XmlPullParser.START_DOCUMENT:
 persons = new ArrayList<Person>();
 break;

 case XmlPullParser.START_TAG:
 /* <persons> */
 if ("person".equals(pullParser.getName())) {
 /* <person id="23"> */
 int id = new Integer(pullParser.getAttributeValue(0));
 person = new Person();
 person.setId(id);
 }
 if (person != null) {
 /* <name> */
 if ("name".equals(pullParser.getName())) {
 // 返回文本的值
 /* 李明 */
 person.setName(pullParser.nextText());
 }
 /* <age> */

 if ("age".equals(pullParser.getName())) {
 /* 30 */person.setAge(new Short(pullParser.nextText()));
 }
 }

 break;

 // 結束元素事件
 /* </persons> */
 case XmlPullParser.END_TAG:
 // 當前解析器指向的節點為person
 if ("person".equals(pullParser.getName())) {
 persons.add(person);
 person = null;
 }
 break;
 }
 // 解析器向後解析
 event = pullParser.next();
 }

 return persons;

 }

 

}

package com.example.lession03_xml.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.R.bool;
import android.os.Environment;
import android.provider.ContactsContract.CommonDataKinds.Event;
import android.util.Xml;

import com.example.lession03_xml.domain.Person;

/**
* 采用pull解析xml文件事件驅動開始,結束元素事件產生的事件是一個數字,通過switch語句體現
*
* @author zhaoyazhi
*
*/
public class XMLPullService {
public List<Person> getPerson(InputStream inputStream) throws Exception {
List<Person> persons = null;
Person person = null;

  // android提供一個類XmlPullParser,得到pull解析器
  XmlPullParser pullParser = Xml.newPullParser();
  // 設置要進行解析的內容,不是立刻發生,調用才發生
  pullParser.setInput(inputStream, "utf-8");

/* <?xml version="1.0" encoding="UTF-8"?> */
 // 觸發第一個事件用數字形式表示開始文檔事件
 int event = pullParser.getEventType();
 // 不等於文檔的結束時間
 while (event != XmlPullParser.END_DOCUMENT) {
 // 屬於開始文檔事件
 switch (event) {

case XmlPullParser.START_DOCUMENT:
 persons = new ArrayList<Person>();
 break;

case XmlPullParser.START_TAG:
 /* <persons> */
 if ("person".equals(pullParser.getName())) {
 /* <person id="23"> */
 int id = new Integer(pullParser.getAttributeValue(0));
 person = new Person();
 person.setId(id);
 }
 if (person != null) {
 /* <name> */
 if ("name".equals(pullParser.getName())) {
 // 返回文本的值
 /* 李明 */
 person.setName(pullParser.nextText());
 }
 /* <age> */

     if ("age".equals(pullParser.getName())) {
      /* 30 */person.setAge(new Short(pullParser.nextText()));
     }
    }

break;

// 結束元素事件
 /* </persons> */
 case XmlPullParser.END_TAG:
 // 當前解析器指向的節點為person
 if ("person".equals(pullParser.getName())) {
 persons.add(person);
 person = null;
 }
 break;
 }
 // 解析器向後解析
 event = pullParser.next();
 }

return persons;

}

XmlActivity.java
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package com.example.lession03_xml;

import java.io.InputStream;
import java.util.List;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import com.example.lession03_xml.domain.Person;
import com.example.lession03_xml.service.XMLContentHandlerService;
import com.example.lession03_xml.service.XMLDomService;
import com.example.lession03_xml.service.XMLPullService;

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 XmlActivity extends Activity {
 // 聲明控件
 public Button btn_sax, btn_dom, btn_pull, btn_cpull;
 public XMLDomService xmlDomService;
 public XMLPullService xmlPullService;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 // 設置顯示的視圖
 setContentView(R.layout.activity_xml);

 // 實例化
 xmlDomService = new XMLDomService();
 xmlPullService = new XMLPullService();

 // 通過findViewById方法獲取控件對象
 btn_sax = (Button) findViewById(R.id.btn_sax);
 btn_dom = (Button) findViewById(R.id.btn_dom);
 btn_pull = (Button) findViewById(R.id.btn_pull);
 btn_cpull = (Button) findViewById(R.id.button_cpull);

 // 給按鈕注冊事件
 btn_sax.setOnClickListener(new MyClickListener());
 btn_dom.setOnClickListener(new MyClickListener());
 btn_pull.setOnClickListener(new MyClickListener());
 btn_cpull.setOnClickListener(new MyClickListener());
 }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
 // Inflate the menu; this adds items to the action bar if it is present.
 getMenuInflater().inflate(R.menu.xml, menu);
 return true;
 }

 class MyClickListener implements View.OnClickListener {

 @Override
 public void onClick(View v) {

 // 獲取組件的id
 int id = v.getId();

 switch (id) {
 case R.id.btn_sax:
 Toast.makeText(XmlActivity.this, "采用sax解析xml文件案例",
 Toast.LENGTH_LONG).show();

 // sax解析的工廠對象
 SAXParserFactory factory = SAXParserFactory.newInstance();
 try {
 // 得到sax的解析器
 SAXParser saxParser = factory.newSAXParser();
 // 創建handler對象
 XMLContentHandlerService handlerService = new XMLContentHandlerService();
 // 獲取到了 asserts目錄中 csdn.xml文件
 InputStream is = getAssets().open("csdn.xml");
 // 直接解析 InputStream的流對象
 saxParser.parse(is, handlerService);
 // 通過 handlerService對象
 Toast.makeText(XmlActivity.this,
 "---" + handlerService.getPersons().size(),
 Toast.LENGTH_LONG).show();
 } catch (Exception e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
 }
 break;
 case R.id.btn_dom:
 InputStream is = null;
 try {
 // 獲取讀取文件的輸入流對象
 is = getAssets().open("csdn.xml");
 // 采用
 List<Person> persons = xmlDomService.parseXML(is);
 //
 Toast.makeText(XmlActivity.this,
 "" + persons.get(0).getName(), Toast.LENGTH_LONG)
 .show();

 } catch (Exception e) {
 e.printStackTrace();
 }

 break;

 case R.id.btn_pull:
 List<Person> persons = null;
 try {
 persons = xmlPullService.getPerson(getAssets().open(
 "csdn.xml"));

 } catch (Exception e) {
 e.printStackTrace();
 }
 if (persons != null) {
 Toast.makeText(
 XmlActivity.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.button_cpull:
 
 break;

 default:
 break;

 }

 }
 }
}

package com.example.lession03_xml;

import java.io.InputStream;
import java.util.List;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import com.example.lession03_xml.domain.Person;
import com.example.lession03_xml.service.XMLContentHandlerService;
import com.example.lession03_xml.service.XMLDomService;
import com.example.lession03_xml.service.XMLPullService;

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 XmlActivity extends Activity {
// 聲明控件
public Button btn_sax, btn_dom, btn_pull, btn_cpull;
public XMLDomService xmlDomService;
public XMLPullService xmlPullService;

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  // 設置顯示的視圖
  setContentView(R.layout.activity_xml);

  // 實例化
  xmlDomService = new XMLDomService();
  xmlPullService = new XMLPullService();

  // 通過findViewById方法獲取控件對象
  btn_sax = (Button) findViewById(R.id.btn_sax);
  btn_dom = (Button) findViewById(R.id.btn_dom);
  btn_pull = (Button) findViewById(R.id.btn_pull);
  btn_cpull = (Button) findViewById(R.id.button_cpull);

  // 給按鈕注冊事件
  btn_sax.setOnClickListener(new MyClickListener());
  btn_dom.setOnClickListener(new MyClickListener());
  btn_pull.setOnClickListener(new MyClickListener());
  btn_cpull.setOnClickListener(new MyClickListener());
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.xml, menu);
  return true;
}

class MyClickListener implements View.OnClickListener {

@Override
public void onClick(View v) {

// 獲取組件的id
int id = v.getId();

   switch (id) {
   case R.id.btn_sax:
    Toast.makeText(XmlActivity.this, "采用sax解析xml文件案例",
      Toast.LENGTH_LONG).show();

// sax解析的工廠對象
 SAXParserFactory factory = SAXParserFactory.newInstance();
 try {
 // 得到sax的解析器
 SAXParser saxParser = factory.newSAXParser();
 // 創建handler對象
 XMLContentHandlerService handlerService = new XMLContentHandlerService();
 // 獲取到了 asserts目錄中 csdn.xml文件
 InputStream is = getAssets().open("csdn.xml");
 // 直接解析 InputStream的流對象
 saxParser.parse(is, handlerService);
 // 通過 handlerService對象
 Toast.makeText(XmlActivity.this,
 "---" + handlerService.getPersons().size(),
 Toast.LENGTH_LONG).show();
 } catch (Exception e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
 }
 break;
 case R.id.btn_dom:
 InputStream is = null;
 try {
 // 獲取讀取文件的輸入流對象
 is = getAssets().open("csdn.xml");
 // 采用
 List<Person> persons = xmlDomService.parseXML(is);
 //
 Toast.makeText(XmlActivity.this,
 "" + persons.get(0).getName(), Toast.LENGTH_LONG)
 .show();

    } catch (Exception e) {
     e.printStackTrace();
    }

break;

case R.id.btn_pull:
 List<Person> persons = null;
 try {
 persons = xmlPullService.getPerson(getAssets().open(
 "csdn.xml"));

    } catch (Exception e) {
     e.printStackTrace();
    }
    if (persons != null) {
     Toast.makeText(
       XmlActivity.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.button_cpull:

    break;

default:
break;

}

}
}
}

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