使用SAX解析xml文件
通常解析xml文件我们主要用到的时候利用第三方的jar包如:jdom,dom4j来解析xml文件，但是这里使用的是jdk自带的解析类库，使用jdk自带的类库SAX方式解析的话，解析效率会比较高:
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?当我们使用jdk自带的解析类库的话，我们必须要继承DefaultHandler.java的类库：
xml事件处理类:
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解析类:
/** * */package com.sandy.xml.parse;import java.io.ByteArrayInputStream;import java.io.IOException;import java.io.InputStream;import java.util.Map;import java.util.Set;import javax.xml.parsers.ParserConfigurationException;import javax.xml.parsers.SAXParser;import javax.xml.parsers.SAXParserFactory;import org.xml.sax.SAXException;import com.sandy.xml.util.XMLHandler;/** * @author sandy * */public class ParseXML {private Map<String, Object> props=null;private void parse(InputStream in) throws IOException {XMLHandler handler = new XMLHandler();SAXParserFactory factory = SAXParserFactory.newInstance();SAXParser parser = null;try {try {parser = factory.newSAXParser();parser.parse(in, handler);props = handler.getProps();} catch (ParserConfigurationException e) {System.out.println("ParserConfigurationException");e.printStackTrace();} catch (SAXException e) {System.out.println("SAXException");e.printStackTrace();}} finally {factory = null;parser = null;handler = null;}}/** * @return the props */public Map<String, Object> getProps() {return props;}public static void main(String[] args) {ParseXML xml = new ParseXML();String xmlString="<ROOT type='request'>"+"<stdmsgtype>0100</stdmsgtype>"+"<std400trcd>201101</std400trcd>"+"<stdprocode>201101</stdprocode>"+"<std400aqid>N</std400aqid>"+"<std400tlno>0279</std400tlno>"+"<stdlocdate>20100423</stdlocdate>"+"<stdloctime>110541</stdloctime>"+"<std400autl></std400autl>"+"<stdauthid></stdauthid>"+"<stdadddtap></stdadddtap>"+"<stdibsdate></stdibsdate>"+"<stdrefnum></stdrefnum>"+"<stdsetdate></stdsetdate>"+"<std400trno></std400trno>"+"<std400mgid></std400mgid>"+"<std400acur></std400acur>"+"<stdmercno>010100099970014</stdmercno>"+"<M_CODE>000000000000000025</M_CODE>"+"<M_CODETYPE>0</M_CODETYPE>"+"</ROOT>";try {xml.parse(new ByteArrayInputStream(xmlString.getBytes()));Map<String,Object> m=xml.getProps();Set<Map.Entry<String, Object>> s=m.entrySet();for(Object o:s){System.out.println(o);}} catch (IOException e) {System.out.println("解析xml出错!");e.printStackTrace();}}}?
说明:这种解析方式是基于事件驱动的，运用的是基于观察者的设计模式.
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