使用Pull解析器生成XML文件和读取xml文件

1. package com.example.lession04_pull.domain;  
2.   
3. import java.io.Serializable;  
4.   
5. public class Person implements Serializable{  
6.   
7.     /** 
8.      *  
9.      */  
10.     private static final long serialVersionUID = 1L;  
11.     private int id;  
12.     private String name;  
13.     private short age;  
14.     public int getId() {  
15.         return id;  
16.     }  
17.     public void setId(int id) {  
18.         this.id = id;  
19.     }  
20.     public String getName() {  
21.         return name;  
22.     }  
23.     public void setName(String name) {  
24.         this.name = name;  
25.     }  
26.     public short getAge() {  
27.         return age;  
28.     }  
29.     public void setAge(short age) {  
30.         this.age = age;  
31.     }  
32.     public Person(int id, String name, short age) {  
33.         super();  
34.         this.id = id;  
35.         this.name = name;  
36.         this.age = age;  
37.     }  
38.     public Person() {  
39.         super();  
40.         // TODO Auto-generated constructor stub  
41.     }  
42.       
43.       
44. }  

1. package com.example.lession04_pull.service;  
2.   
3. import java.io.File;  
4. import java.io.FileOutputStream;  
5. import java.io.InputStream;  
6. import java.util.ArrayList;  
7. import java.util.List;  
8.   
9. import org.xmlpull.v1.XmlPullParser;  
10. import org.xmlpull.v1.XmlSerializer;  
11. import android.os.Environment;  
12. import android.util.Xml;  
13.   
14. import com.example.lession04_pull.domain.Person;  
15.   
16. public class PullXmlService {  
17.       
18.     public Person currentPerson;  
19.   
20.     public List<Person> readXml(InputStream is){  
21.         //声明返回值  
22.         List<Person> persons=null;  
23.         //首先利用Xml.newPullParser()获取解析对象  
24.         XmlPullParser xmlPullParser=Xml.newPullParser();  
25.         try{  
26.             // 解析文件  
27.             xmlPullParser.setInput(is, "UTF-8");  
28.             //获取解析的事件类型  
29.             int eventType=xmlPullParser.getEventType();  
30.             //判断文件解析的是否完毕  
31.             while(eventType!=XmlPullParser.END_DOCUMENT){  
32.                 switch (eventType) {  
33.                 case XmlPullParser.START_DOCUMENT:  
34.                     persons=new ArrayList<Person>();  
35.                     break;  
36.   
37.                 case XmlPullParser.START_TAG:  
38.                     String tagName=xmlPullParser.getName();  
39.                     if("person".equals(tagName)){  
40.                         //创建person对象  
41.                         currentPerson=new Person();  
42.                         currentPerson.setId(Integer.parseInt(xmlPullParser  
43.                                 .getAttributeValue(null, "id")));  
44.                     }else if("name".equals(tagName)){  
45.                         currentPerson.setName(xmlPullParser.nextText());  
46.                     }else if("age".equals(tagName)){  
47.                         currentPerson.setAge(new Short(xmlPullParser.nextText()));  
48.                     }  
49.                     break;  
50.                 case XmlPullParser.END_TAG:  
51.                     if("person".equals(xmlPullParser.getName()) && currentPerson!=null){  
52.                         //把person对象放到集合中去  
53.                         persons.add(currentPerson);  
54.                         currentPerson=null;  
55.                     }  
56.                     break;  
57.                 }  
58.                 eventType=xmlPullParser.next();  
59.             }  
60.             is.close();  
61.         }catch(Exception e){  
62.             e.printStackTrace();  
63.         }  
64.         return persons;  
65.     }  
66.       
67.       
68.       
69.     // 写入  
70.         public boolean write(List<Person> persons) {  
71.             // 采用pull解析进行实现  
72.   
73.             if (Environment.getExternalStorageState().equals(  
74.                     Environment.MEDIA_MOUNTED)) {  
75.   
76.                 // 获取sdcard目录 文件对象  
77.                 File sdCardDir = Environment.getExternalStorageDirectory();  
78.                 // 创建文件  
79.                 File file = new File(sdCardDir, "mycsdn.xml");  
80.   
81.                 XmlSerializer serializer = Xml.newSerializer();  
82.   
83.                 FileOutputStream fos = null;  
84.                 try {  
85.                     // 根据文件对象创建一个文件的输出流对象  
86.                     fos = new FileOutputStream(file);  
87.                     // 设置输出的流及编码  
88.                     serializer.setOutput(fos, "UTF-8");  
89.                     // 设置文件的开始  
90.                     serializer.startDocument("UTF-8", true);  
91.                     // persons标签开始  
92.                     serializer.startTag(null, "persons");  
93.                     for (Person person : persons) {  
94.                         // person标签的开始  
95.                         serializer.startTag(null, "person");  
96.                         // 设置person标签的属性  
97.                         serializer.attribute("null", "id", person.getId() + "");  
98.   
99.                         // 设置person标签的子标签 name  
100.                         serializer.startTag(null, "name");  
101.                         serializer.text(person.getName());  
102.                         serializer.endTag(null, "name");  
103.   
104.                         // 设置person标签的子标签的age  
105.                         serializer.startTag(null, "age");  
106.                         serializer.text(person.getAge() + "");  
107.                         serializer.endTag(null, "age");  
108.   
109.                         // person标签的结束  
110.                         serializer.endTag(null, "person");  
111.                     }  
112.   
113.                     // persons标签的结束  
114.                     serializer.endTag(null, "persons");  
115.                     // 文件的结束  
116.                     serializer.endDocument();  
117.   
118.                     fos.flush();  
119.                     fos.close();  
120.                     return true;  
121.                 } catch (Exception e) {  
122.                     e.printStackTrace();  
123.                 }  
124.   
125.             }  
126.   
127.             return false;  
128.         }  
129.   
130. }  

1. package com.example.lession04_pull;  
2.   
3. import java.util.List;  
4.   
5. import com.example.lession04_pull.domain.Person;  
6. import com.example.lession04_pull.service.PullXmlService;  
7.   
8. import android.os.Bundle;  
9. import android.app.Activity;  
10. import android.view.Menu;  
11. import android.view.View;  
12. import android.widget.Button;  
13. import android.widget.Toast;  
14.   
15. public class MainActivity extends Activity {  
16.   
17.     public Button btn_pull,btn_write;  
18.     public PullXmlService pullXmlService;  
19.     @Override  
20.     protected void onCreate(Bundle savedInstanceState) {  
21.         super.onCreate(savedInstanceState);  
22.         setContentView(R.layout.activity_main);  
23.         //实例化  
24.         pullXmlService=new PullXmlService();  
25.           
26.         btn_pull=(Button) findViewById(R.id.btn_pull);  
27.         btn_write=(Button) findViewById(R.id.btn_write);  
28.           
29.         btn_pull.setOnClickListener(new MyOnClickListener());  
30.         btn_write.setOnClickListener(new MyOnClickListener());  
31.     }  
32.   
33.     @Override  
34.     public boolean onCreateOptionsMenu(Menu menu) {  
35.         // Inflate the menu; this adds items to the action bar if it is present.  
36.         getMenuInflater().inflate(R.menu.main, menu);  
37.         return true;  
38.     }  
39.       
40.     class MyOnClickListener implements View.OnClickListener{  
41.   
42.         @Override  
43.         public void onClick(View v) {  
44.             int id=v.getId();  
45.             switch (id) {  
46.             case R.id.btn_pull:  
47.                 List<Person> persons=null;  
48.                 try{  
49.                     persons=pullXmlService.readXml(getAssets().open("csdn.xml"));  
50.                 }catch(Exception e){  
51.                     e.printStackTrace();  
52.                 }  
53.                 if(persons!=null){  
54.                     Toast.makeText(MainActivity.this, "采用pull解析xml文件"+persons.get(0).getName()+"--"+persons.get(1).getName(),  
55.                             Toast.LENGTH_LONG).show();  
56.                 }  
57.                 break;  
58.   
59.             case R.id.btn_write:  
60.                 try{  
61.                     List<Person> pers=pullXmlService.readXml(getAssets().open("csdn.xml"));  
62.                     //重新生成一个xml文件  mysdcare.xml  
63.                     boolean flag=pullXmlService.write(pers);  
64.                     if(flag){  
65.                         Toast.makeText(MainActivity.this, "采用pull解析生产xml文件成功",  
66.                                 Toast.LENGTH_LONG).show();  
67.                     }else{  
68.                         Toast.makeText(MainActivity.this, "采用pull解析生产xml文件失败",  
69.                                 Toast.LENGTH_LONG).show();  
70.                           
71.                     }  
72.                 }catch(Exception e){  
73.                     e.printStackTrace();  
74.                 }  
75.                 break;  
76.             }  
77.               
78.         }  
79.           
80.     }  
81.   
82. }  

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