sax解析XML文件

来源：互联网发布：vs code php开发环境编辑：程序博客网时间：2024/06/06 07:03

要解析的persons.xml文件内容如下：

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

</person>

</person>

</persons>

程序代码文件MyHandler.java

public class MyHandler extends DefaultHandler {private HashMap<String, String> map = null;//存储单个解析的完整对象private List<HashMap<String,String>> list =null;//存储所有的解析对象private String currentTag = null;//正在解析的元素的标签private String currentValue = null;//解析当前元素的值private String nodeName = null;//解析当前的节点名称public MyHandler(String nodeName) {// TODO Auto-generated constructor stubthis.nodeName = nodeName;}@Overridepublic void startDocument() throws SAXException {// TODO Auto-generated method stub//当读到第一个开始标签的时候，会触发这个方法//System.out.println("当读到第一个开始标签的时候，会触发这个方法");list = new ArrayList<HashMap<String,String>>();}@Overridepublic void startElement(String uri, String localName, String qName,Attributes attributes) throws SAXException {//System.out.println("当遇到文档的开头的时候，调用这个方法");//当遇到文档的开头的时候，调用这个方法//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;}@Overridepublic void characters(char[] ch, int start, int length)throws SAXException {//System.out.println("这个方法是用来处理xml文件所读取到的内容");//这个方法是用来处理xml文件所读取到的内容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;//把当前的节点的对应的值和标签设置为空currentValue = null;}@Overridepublic void endElement(String uri, String localName, String qName)throws SAXException {//System.out.println("遇到结束标记的时候，会调用这个方法");//遇到结束标记的时候，会调用这个方法if(qName.equals(nodeName)){list.add(map);map = null;}// TODO Auto-generated method stubsuper.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("进入readXML");List<HashMap<String,String>> list =null;try {//创建一个解析xml的工厂对象//会对XML文件的每一个字符逐一读取并出发相应事件SAXParserFactory spf = SAXParserFactory.newInstance();SAXParser parser = spf.newSAXParser();//解析xmlMyHandler 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("进到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);//延时时间3秒connection.setDoInput(true);// 设置是否从httpUrlConnection读入，默认情况下是true; connection.setRequestMethod("GET");int code = connection.getResponseCode();//验证连接服务器是否成功，没有密码时，返回200为成功，有密码时返回401为成功System.out.println("code="+code);if(code == 200){inputStream =  connection.getInputStream();}}} catch (Exception e) {// TODO: handle exception}return inputStream;}}

测试类Test.java

public class Test {public Test() {// TODO Auto-generated constructor stub}/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubString path="http://chinese-1c71864:8080/android_sax_xml/person.xml";//连接服务器，取回xml文件内容InputStream inputStream = HttpUtils.getXML(path);try {//List<HashMap<String,String>> list = saxService.readXML(inputStream, "person");//遍历循环读书list里的内容for(HashMap<String,String> map : list){System.out.println(map.toString());}} catch (Exception e) {// TODO: handle exception}}}

0 0