Android实现XML解析技术

   privatestaticfinallong serialVersionUID = 1L; 
    private String name;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getLength() {
        return length;
    }
    public void setLength(int length) {
        this.length = length;
    }
    public String getIntroduction() {
        return introduction;
    }
    public void setIntroduction(String introduction) {
        this.introduction = introduction;
    }
    public String getImageurl() {
        return imageurl;
    }
    public void setImageurl(String imageurl) {
        this.imageurl = imageurl;
    }
    private int length;
    private String introduction;
    private String imageurl; 
}

   /**   

     * 参数fileName：为xml文档路径
     */
    public List<River> getRiversFromXml(String fileName){
        List<River> rivers=new ArrayList<River>();
        DocumentBuilderFactory factory=null;
        DocumentBuilder builder=null;
        Document document=null;
        InputStream inputStream=null;
        //首先找到xml文件
        factory=DocumentBuilderFactory.newInstance();
        try {
            //找到xml，并加载文档
            builder=factory.newDocumentBuilder();
            inputStream=this.context.getResources().getAssets().open(fileName);
            document=builder.parse(inputStream);
            //找到根Element
             Element root=document.getDocumentElement();
             NodeList nodes=root.getElementsByTagName(RIVER);
            //遍历根节点所有子节点,rivers 下所有river
             River river=null;
             for(int i=0;i<nodes.getLength();i++){
                     river=new River(); 
                     //获取river元素节点
                     Element riverElement=(Element)(nodes.item(i));
                     //获取river中name属性值
                     river.setName(riverElement.getAttribute(NAME));
                     river.setLength(Integer.parseInt(riverElement.getAttribute(LENGTH)));
                     //获取river下introduction标签
                     Element introduction=(Element)riverElement.getElementsByTagName(INTRODUCTION).item(0);
                     river.setIntroduction(introduction.getFirstChild().getNodeValue());
                     Element imageUrl=(Element)riverElement.getElementsByTagName(IMAGEURL).item(0);
                     river.setImageurl(imageUrl.getFirstChild().getNodeValue()); 
                 rivers.add(river);
             }
        }catch (IOException e){
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        }
         catch (ParserConfigurationException e) {
            e.printStackTrace();
        }finally{
            try {
                inputStream.close();
            } catch (IOException e) {    
                e.printStackTrace();
            }
        }
        return rivers;
    }

List<River> rivers=null;
        SAXParserFactory factory=SAXParserFactory.newInstance();
        try {
            SAXParser parser=factory.newSAXParser();
            //获取事件源
            XMLReader xmlReader=parser.getXMLReader();
            //设置处理器
            RiverHandler handler=new RiverHandler();
            xmlReader.setContentHandler(handler);
            //解析xml文档
            //xmlReader.parse(new InputSource(new URL(xmlPath).openStream()));
            xmlReader.parse(new InputSource(this.context.getAssets().open(xmlPath)));
            rivers=handler.getRivers();    
        } catch (ParserConfigurationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SAXException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        
        return rivers;
    }

        publicvoid startElement (String uri, String localName, String qName, Attributes attributes){ 
         String tagName=localName.length()!=0?localName:qName;
         tagName=tagName.toLowerCase().trim();
         //如果读取的是river标签开始，则实例化River
         if(tagName.equals(RIVER)){
             isRiver=true;
             river=new River();
                /**导航到river开始节点后**/
                river.setName(attributes.getValue(NAME));
                river.setLength(Integer.parseInt(attributes.getValue(LENGTH)));
         }
         //然后读取其他节点
          if(isRiver){ 
              if(tagName.equals(INTRODUCTION)){
                 xintroduction=true;
             }else if(tagName.equals(IMAGEURL)){
                 ximageurl=true;
             }  
         }  
        }
        
        /**导航到结束标签触发**/
        public void endElement (String uri, String localName, String qName){
         String tagName=localName.length()!=0?localName:qName;
         tagName=tagName.toLowerCase().trim();
         
        //如果读取的是river标签结束，则把River添加进集合中
         if(tagName.equals(RIVER)){
             isRiver=true;
             rivers.add(river);
         }
         //然后读取其他节点
          if(isRiver){ 
              if(tagName.equals(INTRODUCTION)){
                 xintroduction=false;
             }else if(tagName.equals(IMAGEURL)){
                 ximageurl=false;
             } 
          }   
        } 
        
        //这里是读取到节点内容时候回调
        public void characters (char[] ch, int start, int length){
            //设置属性值
                if(xintroduction){
                     //解决null问题
                     river.setIntroduction(river.getIntroduction()==null?"":river.getIntroduction()+new String(ch,start,length));
                 }else if(ximageurl){
                     //解决null问题
                     river.setImageurl(river.getImageurl()==null?"":river.getImageurl()+new String(ch,start,length));
                 }    
        } 

List<River> rivers=new ArrayList<River>();
        River river=null;
        InputStream inputStream=null;    
        //获得XmlPullParser解析器
        XmlPullParser xmlParser = Xml.newPullParser();   
        try {
            //得到文件流，并设置编码方式
            inputStream=this.context.getResources().getAssets().open(xmlPath);
            xmlParser.setInput(inputStream, "utf-8");
            //获得解析到的事件类别，这里有开始文档，结束文档，开始标签，结束标签，文本等等事件。
            int evtType=xmlParser.getEventType();
         //一直循环，直到文档结束    
         while(evtType!=XmlPullParser.END_DOCUMENT){ 
            switch(evtType){ 
            case XmlPullParser.START_TAG:
                String tag = xmlParser.getName(); 
                //如果是river标签开始，则说明需要实例化对象了
                if (tag.equalsIgnoreCase(RIVER)) { 
                   river = new River(); 
                  //取出river标签中的一些属性值
                  river.setName(xmlParser.getAttributeValue(null, NAME));
                  river.setLength(Integer.parseInt(xmlParser.getAttributeValue(null, LENGTH)));
                }else if(river!=null){
                    //如果遇到introduction标签，则读取它内容
                    if(tag.equalsIgnoreCase(INTRODUCTION)){
                    river.setIntroduction(xmlParser.nextText());
                    }else if(tag.equalsIgnoreCase(IMAGEURL)){
                        river.setImageurl(xmlParser.nextText());
                    }
                }
                break;
                
           case XmlPullParser.END_TAG:
             //如果遇到river标签结束，则把river对象添加进集合中
               if (xmlParser.getName().equalsIgnoreCase(RIVER) && river != null) { 
                   rivers.add(river); 
                   river = null; 
               }
                break; 
                default:break;
            }
            //如果xml没有结束，则导航到下一个river节点
            evtType=xmlParser.next();
         }
        } catch (XmlPullParserException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        } 
        return rivers; 

 }