sax解析XML文件

要解析的persons.xml文件內容如下：

<?xml version="1.0" encoding="UTF-8"?>

<persons>

<person id="1">

         <name>張三</name>

<age>34</age>

</person>

        <person id ="2">

                <name>李四</name>

                <age>24</age>

</person>

</persons>

程序代碼文件MyHandler.java

public class MyHandler extends DefaultHandler {
	
	private HashMap<String, String> map = null;//存儲單個解析的完整對象
	private List<HashMap<String,String>> list =null;//存儲所有的解析對象
	private String currentTag = null;//正在解析的元素的標籤
	private String currentValue = null;//解析當前元素的值
	private String nodeName = null;//解析當前的節點名稱
	
	public MyHandler(String nodeName) {
		// TODO Auto-generated constructor stub
		this.nodeName = nodeName;
	}
	@Override
	public void startDocument() throws SAXException {
		// TODO Auto-generated method stub
		//當讀到第一個開始標籤的時候，會觸發這個方法
		//System.out.println("當讀到第一個開始標籤的時候，會觸發這個方法");
		list = new ArrayList<HashMap<String,String>>();
		
	}
	@Override
	public void startElement(String uri, String localName, String qName,
			Attributes attributes) throws SAXException {
		//System.out.println("當遇到文檔的開頭的時候，調用這個方法");
		//當遇到文檔的開頭的時候，調用這個方法
		//System.out.println("qName="+qName +"    nodeName="+nodeName);
		if(qName.equals(nodeName)){
			map = new HashMap<String, String>();
			
		}
		if(attributes != null && map != null){
			for(int i = 0;i<attributes.getLength();i++){
				map.put(attributes.getQName(i), attributes.getValue(i));
				
			}
		}
		currentTag = qName;
		
		
	}
	@Override
	public void characters(char[] ch, int start, int length)
			throws SAXException {
		//System.out.println("這個方法是用來處理xml文件所讀取到的內容");
		//這個方法是用來處理xml文件所讀取到的內容
		if(currentTag!=null&&map!=null){
			
			currentValue = new String(ch,start,length);
			
			if(currentValue !=null && !currentValue.trim().equals("") && !currentValue.trim().equals("\n")){
				map.put(currentTag, currentValue);
				
			}
		}
		currentTag = null;//把當前的節點的對應的值和標籤設置爲空
		currentValue = null;
		
	}
	@Override
	public void endElement(String uri, String localName, String qName)
			throws SAXException {
		//System.out.println("遇到結束標記的時候，會調用這個方法");
		//遇到結束標記的時候，會調用這個方法
		if(qName.equals(nodeName)){
			list.add(map);
			map = null;
		}
		// TODO Auto-generated method stub
		super.endElement(uri, localName, qName);
	}
	
	public List<HashMap<String,String>> getList() {
		return list;
	}

saxService.java

public class saxService {

	public saxService() {
		// TODO Auto-generated constructor stub
	}
	public static List<HashMap<String,String>> readXML(InputStream inputStream,String nodeName){
		System.out.println("進入readXML");
		
		List<HashMap<String,String>> list =null;
		try {
			//創建一個解析xml的工廠對象
			//會對XML文件的每一個字符逐一讀取並出發相應事件
			SAXParserFactory spf = SAXParserFactory.newInstance();
			SAXParser parser = spf.newSAXParser();//解析xml
			MyHandler handler = new MyHandler(nodeName);
			parser.parse(inputStream, handler);
			inputStream.close();
			return handler.getList();
		} catch (Exception e) {
			// TODO: handle exception
		}
		return list;
	}
}

HttpUtils.java

public class HttpUtils {

	public HttpUtils() {
		// TODO Auto-generated constructor stub
	}
	public static InputStream getXML(String path){
		System.out.println("進到httpUtils");
		InputStream inputStream = null;
		try {
			URL url = new URL(path);
			System.out.println("url="+url.toString());
			if(url != null){
				HttpURLConnection connection = (HttpURLConnection) url.openConnection();
				connection.setConnectTimeout(3000);//延時時間3秒
				connection.setDoInput(true);// 設置是否從httpUrlConnection讀入，默認情況下是true; 
				connection.setRequestMethod("GET");
				int code = connection.getResponseCode();//驗證連接服務器是否成功，沒有密碼時，返回200爲成功，有密碼時返回401爲成功
				System.out.println("code="+code);
				if(code == 200){
					inputStream =  connection.getInputStream();
				}
			}
		} catch (Exception e) {
			// TODO: handle exception
		}
		return inputStream;
	}
}

測試類Test.java

public class Test {

	public Test() {
		// TODO Auto-generated constructor stub
	}

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String path="http://chinese-1c71864:8080/android_sax_xml/person.xml";
		//連接服務器，取回xml文件內容
		InputStream inputStream = HttpUtils.getXML(path);
		try {
			//
			List<HashMap<String,String>> list = saxService.readXML(inputStream, "person");
			//遍歷循環讀書list裏的內容
			for(HashMap<String,String> map : list){
				System.out.println(map.toString());
				
			}
		} catch (Exception e) {
			// TODO: handle exception
		}

	}

}