Pull 解析/生成 XML文档

Android内置的XML解析器，运行方式与SAX类似，提供了如开始元素和结束元素等事件。
使用parser.next()可进入下一个元素并触发相应事件，可使用一个switch对感兴趣的事件进行选择和处理。
调用parser.nextText()获取下一个Text类型元素的值。
可在www.xmlpull.org下载Pull解析器源码和文档。
【特点】结构简单（一个借口，一个例外，一个工厂组成）；
简单易用（只用一个重要方法next()检索下一个事件，
5个事件：START_DOCUMENT,START_TAG,TEXT,END_TAG,END_DOCUMENT）；
多功能性，最小的需求
使用步骤：
①：针对从XML中获取到的信息，需对其建立一个对象（例：Person）,存放相关信息
②：由Xml.newPullParser()创建XmlPullParser
③：设置资源并指定解析编码 pullParser.setInput(is,"UTF-8");
④：测试需要，建立一个person.xml文件，内容如下：
<?xml version="1.0" encoding="UTF-8" ?>
<persons>
<person id="23">
<name>Test</name>
<age>21</age>
</person>
</persons>
⑤：在应用中通过
InputStream is = MainActivity.class.getClassLoader().getResourceAsStream("person.xml");
加载需要解析的文件

*****************************
⑥：生成（保存）xml文档：
通过Xml.newSerializer()获取XmlSerializer序列生成器
设置编码：xSerializer.setOutput(outputStream,"UTF-8");
xSerializer.startDocument("UTF-8",true);
建立File，以OutputStream形式进行生成

【附】：android应用单元测试方法
①：在AndroidManifest.xml中添加节点
<uses-library android:name="android.test.runner" />
<instrumentation android:name="android.test.InstrumentationTestRunner"
android:targetPackage="cn.gzu.xmlparsertest" />
②：建立测试类继承AndroidTestCase

【源代码如下：】
*/
/****************************************【源码】START**************************************************/

//1.Person.java

public class Person {
	private Integer id;
	private String name;
	private short age;
	
	public Person() {
		super();
	}
	public Person(String name,short age) {
		super();
		this.name = name;
		this.age = age;
	}
	public Person(Integer id,String name,short age) {
		super();
		this.id = id;
		this.name = name;
		this.age = age;
	}
	// getter and setter ...
}

//2.PullParseService.java

public class PullParseService {
	/** Pull 解析Xml文档 */
	public static List<Person> getPersons(InputStream is) throws Exception{
		List<Person> persons = null;
		Person person = null;
		
		 XmlPullParser pullParser = Xml.newPullParser();
		 pullParser.setInput(is,"UTF-8");
		 
		 int eventType = pullParser.getEventType();
		 while(eventType!=XmlPullParser.END_DOCUMENT){
			 switch(eventType){
			 case XmlPullParser.START_DOCUMENT:
				 persons = new ArrayList<Person>();
				 
				 break;
			 case XmlPullParser.START_TAG:
				 if("person".equals(pullParser.getName())){
					 int id = Integer.valueOf(pullParser.getAttributeValue(0));
					 person = new Person();
					 person.setId(id);
				 }
				 if(person != null){
					 if("name".equals(pullParser.getName())){
						 person.setName(pullParser.nextText());
					 }
					 if("age".equals(pullParser.getName())){
						 person.setAge(new Short(pullParser.nextText()));
					 }
				 }
				 
				 break;
			 case XmlPullParser.END_TAG:
				 if("person".equals(pullParser.getName())){
					 persons.add(person);
					 person = null;
				 }
				 
				 break;
			 }
			 
			 eventType = pullParser.next();
		 }
		
		return persons;
	}
}

//3.单元测试类 SAXParserTest.java

public class SAXParserTest extends AndroidTestCase {
	private static final String TAG = "SAXParserTest";
	
	public void testPullGetPerson() throws Throwable{
		InputStream is = this.getClass().getClassLoader().getResourceAsStream("person.xml");
		List<Person> persons = PullParseService.getPersons(is);
		String text = "";
		for(Person p:persons){
			text = text + "ID: "+p.getId()+" Name: "+p.getName()+" Age: "+p.getAge()+"\n";
		}
		Log.i(TAG,text);
	}
}

//4.MainActivity.java

public class MainActivity extends Activity {
 
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		TextView main = (TextView) findViewById(R.id.main_content);
		
		InputStream is = MainActivity.class.getClassLoader().getResourceAsStream("person.xml");
		try {
			List<Person> persons = testPull(is);
			String text = "Pull ";
			for(Person p:persons){
				text = text + "ID: "+p.getId()+" Name: "+p.getName()+" Age: "+p.getAge()+"\n";
			}
			main.setText(text);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
 
	private List<Person> testPull(InputStream is) throws Exception{
		return DomParserService.getPersons(is);
	}
	
}

//6.AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="cn.gzu.xmlparsertest"
    android:versionCode="1"
    android:versionName="1.0" >
 
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />
 
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <uses-library android:name="android.test.runner" />
        
        <activity
            android:name="cn.gzu.xmlparsertest.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
 
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
    
    <instrumentation android:name="android.test.InstrumentationTestRunner"
        android:targetPackage="cn.gzu.xmlparsertest" />
 
</manifest>

//7.xml生成方法（PullParseService.java中）
/** Pull 保存Xml文档 */

public static void save(List<Person> persons,OutputStream os) throws Exception{
		XmlSerializer xSerializer = Xml.newSerializer();
		xSerializer.setOutput(os,"UTF-8");
		xSerializer.startDocument("UTF-8",true);
		xSerializer.startTag(null,"persons");
		
		for(Person person : persons){
			xSerializer.startTag(null,"person");
			xSerializer.attribute(null,"id",person.getId().toString());
			
			xSerializer.startTag(null,"name");
			xSerializer.text(person.getName());
			xSerializer.endTag(null,"name");
			
			xSerializer.startTag(null,"age");
			xSerializer.text(String.valueOf(person.getAge()));
			xSerializer.endTag(null,"age");
			
			xSerializer.endTag(null,"person");
		}
		
		xSerializer.endTag(null,"persons");
		xSerializer.endDocument();
		
		os.flush();
		os.close();
	}

//8.测试生成类方法 public void testPullSavePerson() throws Throwable{ File file = new File(this.getContext().getFilesDir(),"persons.xml"); FileOutputStream outputStream = new FileOutputStream(file); List<Person> persons = new ArrayList<Person>(); persons.add(new Person(101,"张五常",(short)21)); persons.add(new Person(102,"刘丽",(short)20)); persons.add(new Person(103,"吴雪雪",(short)19)); persons.add(new Person(104,"莉莉",(short)23)); PullParseService.save(persons,outputStream); Log.i(TAG,"***************** testPullSavePerson **************"); } //9.生成结果 persons.xml <?xml version='1.0' encoding='UTF-8' standalone='yes' ?> <persons> <person id="101"> <name>张五常</name> <age>21</age> </person> <person id="102"> <name>刘丽</name> <age>20</age> </person> <person id="103"> <name>吴雪雪</name> <age>19</age> </person> <person id="104"> <name>莉莉</name> <age>23</age> </person> </persons> /****************************************【源码】END**************************************************/

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