Android 解析xml 之DOM

<span style="font-size: 16px;">DOM解析器是通过将XML文档解析成树状模型并将其放入内存来完成解析工作的，而后对文档的操作都是在这个树状模型上完成的。这个在内存中的文档树将是文档实际大小的几倍。这样做的好处是结构清除、操作方便，而带来的麻烦就是极其耗费系统资源。而SAX正好克服了DOM的缺点，分析能够立即开始，而不是等待所有的数据被处理。而且，由于应用程序只是在读取数据时检查数据，因此不需要将数据存储在内存中，这对于大型文档来说是个巨大的优点。事实上，应用程序甚至不必解析整个文档；它可以在某个条件得到满足时停止解析。</span>

<span style="font-size: 24px; color: #ff0000;">文件配置和pull,sax解析一样</span>

package rw.dom;

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

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

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;


import android.app.Activity;
import android.content.res.AssetManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;

public class XML_DomActivity extends Activity {
    /** Called when the activity is first created. */
	private Button button;
	private ListView listView;
	private Student student;
	private List<Student> lisStudents=new ArrayList<Student>();
	private List<String> list=new ArrayList<String>();
	private String Result="";
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        button=(Button) findViewById(R.id.button1);
        button.setOnClickListener(new ButtonListener());
        listView=(ListView)findViewById(R.id.listView1);
    }
    class ButtonListener implements OnClickListener{

		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
			AssetManager assetManager=getAssets();
			
			DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();
			try {
				InputStream inputStream=assetManager.open("student.xml");
				DocumentBuilder builder=factory.newDocumentBuilder();
				Document document=builder.parse(inputStream);
				Element element= document.getDocumentElement();//获取文档的根元素
				NodeList nodeList=element.getElementsByTagName("student");  //获取rootElement的所有子节点（不包括属性节点），返回一个NodeList对象  
				for (int i = 0; i < nodeList.getLength(); i++) {
					student=new Student();
					Element element2=(Element)nodeList.item(i);
					student.setId(Integer.parseInt(element2.getAttribute("id")));
					Log.i("------->", element2.getAttribute("id"));
					NodeList nodeList2=element2.getChildNodes();
				     for (int j = 0; j <nodeList2.getLength(); j++) {
				    	 Log.i("---------->", String.valueOf(j));
						Node node=nodeList2.item(j);
						if (node.getNodeType()==Node.ELEMENT_NODE) {
							Element element3 =(Element)node;
							String elString=element3.getNodeName();
							String string=element3.getFirstChild().getNodeValue();
							if (elString.equals("name")) {
								student.setName(string);
							}else if (elString.equals("speciality")) {
								student.setSpeciality(string);
							}else if (elString.equals("qq")) {
								student.setQQ(Integer.parseInt(string));
							}
						}
						}
				     lisStudents.add(student);
						}
	
				
			} catch (ParserConfigurationException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (SAXException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			
			for (Student stu : lisStudents) {
				
			   list.add(stu.toString());
			}
			 ArrayAdapter<String> adapter=new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1,list);
             listView.setAdapter(adapter);
		}
    	
    }
    public class Student {

    	long Id;
    	String Name;
    	String Speciality;
    	long QQ;
    	
    	public Student(long id, String name, String speciality, long qQ) {
    		super();
    		Id = id;
    		Name = name;
    		Speciality = speciality;
    		QQ = qQ;
    	}

    	public Student() {
    		super();
    	}

    	
    	public long getId() {
    		return Id;
    	}

    	public String getName() {
    		return Name;
    	}

    	public long getQQ() {
    		return QQ;
    	}

    	public String getSpeciality() {
    		return Speciality;
    	}

    	public void setId(long id) {
    		Id = id;
    	}

    	public void setName(String name) {
    		Name = name;
    	}

    	public void setQQ(long qQ) {
    		QQ = qQ;
    	}

    	public void setSpeciality(String speciality) {
    		Speciality = speciality;
    	}
    	public String toString() {
    		return (this.getId()+" "+this.getName()+" "+this.getSpeciality()+" "+this.getQQ())+"\n";
		}
    }
}