解析xml 几种方法

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Dom解析xml

package com.example.domresovler;

import java.io.InputStream;

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 android.app.Activity;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends Activity {

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);



   }


   public void btnDomResolver(View v){


       try {
           //step1:得到一个dom解析器的工厂
           DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
           //step2:通过工厂实例对象生成一个document解析器对象
           DocumentBuilder db = factory.newDocumentBuilder();
           //step3:开始解析xml
           InputStream is = getAssets().open("Books.xml");
           //返回的是一个文档对象
           Document document = db.parse(is);
           //得到根节点 Books
           Element root = document.getDocumentElement();
           //得到Books根节点下所有的子节点 Book元素
           NodeList nodeList = root.getElementsByTagName("Book");

           //创建要给容器
           StringBuffer sb = new StringBuffer();

           //遍历子节点
           for (int i = 0; i < nodeList.getLength(); i++) {
               //Book
               Element element = (Element) nodeList.item(i);
               String name = element.getElementsByTagName("name").item(0).getTextContent();//得到name值
               String price = element.getElementsByTagName("price").item(0).getTextContent();
               String author = element.getElementsByTagName("author").item(0).getTextContent();

               sb.append("书名 : "+name+"   价格 : "+price+" 作者 : "+author+"\n");

           }


           System.out.println("--->"+sb.toString());


       } catch (Exception e) {
           e.printStackTrace();
       }

   }

}

Pull解析

package com.example.pullresolver;

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

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;

import android.app.Activity;
import android.os.Bundle;
import android.util.Xml;
import android.view.View;

public class MainActivity extends Activity {

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
   }



   public void btnPullResolver(View v){


       List<Book> books = pullResolverXml();
       System.out.println("哈哈哈 : "+books.toString());

   }

   /**
   * 使用Pull解析xml文档
   */
   private List<Book> pullResolverXml(){
       try {
           //step1:创建一个pull解析器对象
           XmlPullParser parser = Xml.newPullParser();
           //step2:开始解析xml
           InputStream is = getAssets().open("Books.xml");
           parser.setInput(is, "utf-8");
           int type = parser.getEventType();//0 != 1 true   0 != 0 false
           List<Book> books = null;
           Book book = null;

           //判断是否已经读取xml文档的结尾
           while(type != XmlPullParser.END_DOCUMENT){

               switch (type) {
               case XmlPullParser.START_TAG:
               {

                   if("Books".equals(parser.getName())){
                       //创建集合
                       books = new ArrayList<Book>();
                   }else if("Book".equals(parser.getName())){
                       //创建Book对象
                       book = new Book();
                   }else if("name".equals(parser.getName())){
                       //取出name标签里面的内容
                       String name = parser.nextText();
                       book.setName(name);
                   }else if("price".equals(parser.getName())){
                       String price = parser.nextText();
                       book.setPrice(price);
                   }else if("author".equals(parser.getName())){
                       String author = parser.nextText();
                       book.setAuthor(author);
                   }

               }
                   break;

               case XmlPullParser.END_TAG://结束标签
                   if("Book".equals(parser.getName())){
                       //添加到集合
                       books.add(book);
                   }

                   break;
               }



               //让pull解析器对象往下移动一行
               type = parser.next();

           }


           return books;

       } catch (Exception e) {
           e.printStackTrace();
       }

       return null;


   }

}

book

package com.example.pullresolver;

public class Book {

   private String name;
   private String price;
   private String author;
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public String getPrice() {
       return price;
   }
   public void setPrice(String price) {
       this.price = price;
   }
   public String getAuthor() {
       return author;
   }
   public void setAuthor(String author) {
       this.author = author;
   }
   @Override
   public String toString() {
       return "Book [name=" + name + ", price=" + price + ", author=" + author
               + "]";
   }

}

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