Android 开发工具类 20_DOMPersonService

xml 文件

 <?xml version="1.0" encoding="UTF-8"?>
 <persons>
     <person id = "23">
         <name>NEwii</name>
         <age>21</age>
     </person>
     <person id = "20">
         <name>WiiWill</name>
         <age>25</age>
     </person>
 </persons>

DOM 格式

DOM 解析 XML

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

 import javax.xml.parsers.DocumentBuilder;
 import javax.xml.parsers.DocumentBuilderFactory;

 import org.w3c.dom.Document;
 import org.w3c.dom.Element;
 import org.w3c.dom.Node;
 import org.w3c.dom.NodeList;

 import com.wangjialin.domain.Person;

 public class DOMPersonService {

     public static List<Person> getPersons(InputStream inStream) throws Exception{

         List<Person> persons = new ArrayList<Person>();
         DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
         DocumentBuilder builder = factory.newDocumentBuilder();
         Document document = builder.parse(inStream);
         Element root = document.getDocumentElement();
         NodeList personNodes = root.getElementsByTagName("person");

         for(int i=0; i < personNodes.getLength() ; i++){

             Element personElement = (Element)personNodes.item(i);
             int id = new Integer(personElement.getAttribute("id"));
             Person person = new Person();
             person.setId(id);
             NodeList childNodes = personElement.getChildNodes();

             for(int y=0; y < childNodes.getLength(); y++){
                 if(childNodes.item(y).getNodeType() == Node.ELEMENT_NODE){
                     if("name".equals(childNodes.item(y).getNodeName())){
                         String name = childNodes.item(y).getFirstChild().getNodeValue();
                         person.setName(name);
                     }else if("age".equals(childNodes.item(y).getNodeName())){
                         String age = childNodes.item(y).getFirstChild().getNodeValue();
                         person.setAge(new Short(age));
                     }
                 }
             }
             persons.add(person);
         }
         inStream.close();
         return persons;
     }
 }

Person.java

 public class Person {

     private Integer id;
     private String name;
     private Short age;

     public Person(){}

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

     public Person(String name, Short age) {
         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 "id=" + id + ",name=" + name+ ",age=" + age;
     }

 }

JUnit 测试

 public void testDOMgetPersons() throws Throwable{

         InputStream inStream = this.getClass().getClassLoader().getResourceAsStream("wangjialin.xml");
         List<Person> persons = DOMPersonService.getPersons(inStream);

         for(Person person : persons){
             Log.i(TAG, person.toString());
         }
     }