学步园

1:androidmanifest.xml的内容：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="cn.itcast.xml"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
     <uses-library android:name="android.test.runner" />
        <activity android:name=".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>
    <uses-sdk android:minSdkVersion="8" />
     <instrumentation android:name="android.test.InstrumentationTestRunner"
     android:targetPackage="cn.itcast.xml" android:label="Tests for My App" />
    
</manifest> 

其中对其测试环境进行了搭建

2：要读取的xml文件的内容为：test.xml

<?xml version="1.0" encoding="UTF-8"?>
<persons>
    <person id="28">
        <name>bo</name>
        <age>28</age>
    </person>
    <person id="29">
         <name>xiaohong</name>
         <age>21</age>
    </person>
</persons>

3：使用DOM技术读取xml文件的程序XMLService

public class XMLService {
	
	public List<Person> getPerson(InputStream inStream) throws Throwable {
		List<Person> persons = new ArrayList<Person>();
		
		DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
		DocumentBuilder builder = factory.newDocumentBuilder();
		Document document = builder.parse(inStream);
		
		/*
		 * <persons>
              <person id="28">
                   <name>zhangbo</name>
                   <age>28</age>
               </person>
               <person id="29">
                   <name>xiaohong</name>
                   <age>21</age>
              </person>
            </persons>
		 */
		Element element = document.getDocumentElement();    //获得根结点
		NodeList personNodes = element.getElementsByTagName("person");  //根据person获得结点
		for(int i = 0; i<personNodes.getLength(); i++) {
			Person person = new Person();
			Element personElement = (Element) personNodes.item(i);
			person.setId(new Integer(personElement.getAttribute("id")));
			
			NodeList childNodes = personElement.getChildNodes();
			
			for(int j = 0; j<childNodes.getLength(); j++) {
				if(childNodes.item(j).getNodeType() == Node.ELEMENT_NODE) {  //判断当前结点是否是元素结点
					Element childElement = (Element)childNodes.item(j);
					if("name".equals(childElement.getNodeName())) {
						person.setName(childElement.getFirstChild().getNodeValue());
					} else if("age".equals(childElement.getNodeName())) {
					    person.setAge(new Short(childElement.getFirstChild().getNodeValue()));	
					}
				}
			}
			persons.add(person);
		}
		return persons;
	}
}

4：使用到的Person类

public class Person {
	
	private Integer id;
	private String name;
	private Short age;
	
	public Person(){}

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

	public Integer getId() {
		return id;
	}

	public void setId(Integer 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;
	}

	@Override
	public String toString() {
		return "Person [age=" + age + ", id=" + id + ", name=" + name + "]";
	}

}

4：测试类XMLTest

public class XMLTest extends AndroidTestCase {
	private static final String TAG = "XMLTest";

	public void testDomGetPersons() {
		XMLService xmlService = new XMLService();
		InputStream inputStream = getClass().getClassLoader().getResourceAsStream("test.xml");
		try {
			List<Person> persons = xmlService.getPerson(inputStream);
			for(Person person : persons) {
				Log.i(TAG, person.toString());
			}	
		} catch (Throwable e) {
			e.printStackTrace();
		}
	}
}

5：测试结果

在控制台输出Person[age=28, id=28, name=bo]

                       Person[age=21, id=29, name=xiaohong]