分享到 新浪微博騰訊微博收藏+13 踩 頂 0 SAX是一種佔用記憶體少且解析速度快的解析器,它採用的是事件啟動,它不需要解析完整個文檔,而是按照內容順序 看文檔某個部分是否符合xml語法,如果符合就觸發相應的事件,所謂的事件就是些回檔方法(callback),這些方法 定義在ContentHandler中,下面是其主要方法:



startDocument:當遇到文檔的時候就觸發這個事件 調用這個方法 可以在其中做些預處理工作
startElement: (String namespaceURI,String localName,String qName,Attributes atts)當遇開始標籤的時候就會觸發這個方法。
endElement(String uri,String localName,String name):當遇到結束標籤時觸發這個事件,調用此法可以做些善後工作。
charachers(char [] ch,int start,int length):當遇到xml內容時觸發這個方法,用new String(ch,start,length)可以接受內容。



首先在 res目錄下新建一個raw資料夾,然後再裡面麼新建一個student.xml

student.xml

01 <?xml version="1.0" encoding="utf-8"?>    
02 <stundets>  
03   <student id="2009081315">  
04     <name>饶伟</name>  
05     <speciality>计算机科学与技术</speciality>  
06     <qq>812200157</qq>  
07   </student>  
08     
09     <student id="2009081316">  
10     <name>小伟</name>  
11     <speciality>网络工程</speciality>  
12     <qq>812200156</qq>  
13   </student>  
14     <student id="2009081318">  
15     <name>伟哥</name>  
16     <speciality>软件工程</speciality>  
17     <qq>812200158</qq>  
18   </student>  
19     
20 </stundets>

[代码] Student.java

01 public class Student {  
02   
03 long Id;  
04 String Name;  
05 String Speciality;  
06 long QQ;  
07     
08 public Student(long id, String name, String speciality, longqQ) {  
09     super();  
10     Id = id;  
11     Name = name;  
12     Speciality = speciality;  
13     QQ = qQ;  
14 }  
15   
16 public Student() {  
17     super();  
18 }  
19   
20     
21 public long getId() {  
22     return Id;  
23 }  
24   
25 public String getName() {  
26     return Name;  
27 }  
28   
29 public long getQQ() {  
30     return QQ;  
31 }  
32   
33 public String getSpeciality() {  
34     return Speciality;  
35 }  
36   
37 public void setId(long id) {  
38     Id = id;  
39 }  
40   
41 public void setName(String name) {  
42     Name = name;  
43 }  
44   
45 public void setQQ(long qQ) {  
46     QQ = qQ;  
47 }  
48   
49 public void setSpeciality(String speciality) {  
50     Speciality = speciality;  
51 }  
52   
53 }

[代码] StudentHandler.java

01 package rw.Xml_SAX;  
02     
03 import java.util.List;  
04     
05 import org.xml.sax.Attributes;  
06 import org.xml.sax.SAXException;  
07 import org.xml.sax.helpers.DefaultHandler;  
08     
09 import Android.util.Log;  
10     
11 public class StudentHandler extends DefaultHandler {  
12     
13     
14     private String preTAG;    
15     private List<Student> ListStudent;  
16     private Student stu;  
17         
18     public StudentHandler() {  
19         super();  
20     }  
21     
22     public StudentHandler(List<Student> listStudent) {  
23         super();  
24         ListStudent = listStudent;  
25     }  
26     
27     
28     public void startDocument() throws SAXException {  
29         // TODO Auto-generated method stub   
30     Log.i("------>""文档开始");  
31         super.startDocument();  
32     }  
33     
34     public void startElement(String uri, String localName, String qName,  
35             Attributes attributes) throws SAXException {  
36     
37     
38         Log.i("localName-------->", localName);  
39         preTAG=localName;  
40         if ("student".equals(localName)) {  
41             stu=new Student();  
42             stu.setId(Long.parseLong(attributes.getValue(0)));  
43                 
44         for (int i = 0; i < attributes.getLength(); i++) {  
45             //Log.i("attributes-------->", attributes.getValue(i));   
46             Log.i("attributes-------->",String.valueOf(stu.getId()));  
47         }  
48     }  
49         super.startElement(uri, localName, qName, attributes);  
50     }  
51     
52     public void endDocument() throws SAXException {  
53         
54         Log.i("------>""文档结束");  
55         super.endDocument();  
56     }  
57     
58     public void endElement(String uri, String localName, String qName)  
59             throws SAXException {  
60         preTAG="";  
61         if ("student".equals(localName)) {  
62         ListStudent.add(stu);  
63         Log.i("-------->""一个元素解析完成");  
64         }  
65         super.endElement(uri, localName, qName);  
66     }  
67         
68         
69 public void characters(char[] ch, int start, int length)  
70         throws SAXException {  
71         
72         String dateString;  
73        if ("name".equals(preTAG)) {  
74             dateString=new String(ch,start,length);  
75             stu.setName(dateString);  
76             Log.i("name=", stu.getName());  
77         }else if ("speciality".equals(preTAG)) {  
78             dateString=new String(ch,start,length);  
79             stu.setSpeciality(dateString);  
80             Log.i("speciality=", stu.getSpeciality());  
81         }else if ("qq".equals(preTAG)) {  
82             dateString=new String(ch,start,length);  
83             stu.setQQ(Long.parseLong((dateString)));  
84             Log.i("QQ=", String.valueOf(stu.getQQ()));  
85         }  
86     
87         super.characters(ch, start, length);  
88 }  
89     
90                 
91 public List<Student> getListStudent() {  
92     return ListStudent;  
93 }  
94     
95 public void setListStudent(List<Student> listStudent) {  
96     ListStudent = listStudent;  
97 }  
98     
99 }

[代码] XMl_Sax1Activity.java

01 import java.util.ArrayList;  
02 import java.util.Iterator;  
03 import java.util.List;  
04   
05 import javax.xml.parsers.SAXParserFactory;  
06   
07 import org.xml.sax.InputSource;  
08 import org.xml.sax.XMLReader;  
09   
10   
11 import Android.app.Activity;  
12 import Android.os.Bundle;  
13 import Android.util.Log;  
14 import Android.view.View;  
15 import Android.view.View.OnClickListener;  
16 import Android.widget.Adapter;  
17 import Android.widget.ArrayAdapter;  
18 import Android.widget.Button;  
19 import Android.widget.ListView;  
20 import Android.widget.TextView;  
21   
22 public class XMl_Sax1Activity extends Activity {  
23   private Button button;  
24   private TextView textView;  
25   private ListView listView;  
26   private List<String> list=new ArrayList<String>();  
27 public void onCreate(Bundle savedInstanceState) {  
28     super.onCreate(savedInstanceState);  
29     setContentView(R.layout.main);  
30     button=(Button)findViewById(R.id.button1);  
31     textView=(TextView)findViewById(R.id.textView1);  
32     listView=(ListView) findViewById(R.id.listView1);  
33     //InputSource xMLResourceString=new InputSource(XMl_Sax1Activity.this.getResources().openRawResource(R.raw.student));   
34     button.setOnClickListener(new ButtonListener());  
35 }  
36   
37 class ButtonListener implements OnClickListener{  
38   
39     @Override  
40     public void onClick(View v) {  
41            
42        List<Student> students=parserXMl();  
43        for (Iterator iterator = students.iterator(); iterator.hasNext();) {  
44        Student student = (Student) iterator.next();  
45         list.add(String.valueOf(student.getId())+" "+student.getName()+" "+student.getSpeciality()+" "+String.valueOf((student.getQQ())));  
46     }  
47        
48        ArrayAdapter<String> adapter=new ArrayAdapter<String>(getApplicationContext(), Android.R.layout.simple_list_item_1, list);  
49        listView.setAdapter(adapter);  
50     }  
51         
52 }  
53     
54 private List<Student> parserXMl()  
55 {  
56     SAXParserFactory factory=SAXParserFactory.newInstance();  
57     List<Student>students=null;  
58     Student student=null;  
59     try {  
60     XMLReader reader=factory.newSAXParser().getXMLReader();  
61     students=new ArrayList<Student>();  
62     reader.setContentHandler(new StudentHandler(students));  
63     reader.parse(newInputSource(XMl_Sax1Activity.this.getResources().openRawResource(R.raw.student)));  
64     for (Iterator iterator = students.iterator(); iterator.hasNext();) {  
65          student = (Student) students.iterator();     
66     }  
67     students.add(student);  
68     catch (Exception e) {  
69     // TODO: handle exception   
70     }  
71     return students;  
72 }  
73 }

[代码] 布局文件main.xml

01 <?xml version="1.0" encoding="utf-8"?>  
02 <LinearLayoutxmlns:Android="http://schemas.android.com/apk/res/android"  
03     Android:orientation="vertical"  
04     Android:layout_width="fill_parent"  
05     Android:layout_height="fill_parent"  
06     >  
07     
08 <Button Android:text="SAX解析" android:id="@+id/button1"android:layout_height="wrap_content"android:layout_width="match_parent"></Button>  
09 <TextView Android:text="" android:id="@+id/textView1"android:layout_width="wrap_content"android:layout_height="wrap_content"></TextView>  
10 <ListView Android:layout_height="wrap_content"android:id="@+id/listView1"android:layout_width="match_parent"></ListView>  
11 </LinearLayout>
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