微信消息处理JAXP-sax解析

package cn.zhaokai.sax;

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;

public class Demo1 extends HttpServlet {

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

    try {
            //解决乱码问题
            request.setCharacterEncoding("UTF-8");
            response.setContentType("text/html;charset=UTF-8"); 
            //得到输入流
            InputStream inputStream = request.getInputStream();
            //A single input source for an XML entity
            InputSource input = new InputSource(inputStream);
            
           //5步 sax解析
            //1创建工厂
            SAXParserFactory factory = SAXParserFactory.newInstance();
           //得到解析器
            SAXParser sp= factory.newSAXParser();     
           //3.得到读取器
            XMLReader reader = sp.getXMLReader();        
            //4.设置内容处理器，TagValueHandler是单独写的函数
           TagValueHandler handler= new TagValueHandler();
           reader.setContentHandler(handler); 
           //5.读取xml文档内容
           reader.parse(input); 
           //返回识别结果
           List list = handler.getList();
           
           //定义输出对象，输出到response
           PrintWriter out = response.getWriter();
           
           //输出原始消息
           String content1 = "<xml><ToUserName><![CDATA[gh_1c586f95bd68]]></ToUserName><FromUserName><![CDATA[ogNtkuMTj4uOx-DCvLfu8mUDmubM]]></FromUserName><CreateTime>1403313142</CreateTime><MsgType><![CDATA[text]]></MsgType><Content><![CDATA[软件孵化实验室]]></Content><MsgId>6027184051137754303</MsgId></xml>";
           String content2 = "<xml><ToUserName><![CDATA[gh_1c586f95bd68]]></ToUserName><FromUserName><![CDATA[ogNtkuMTj4uOx-DCvLfu8mUDmubM]]></FromUserName><CreateTime>1403313091</CreateTime><MsgType><![CDATA[event]]></MsgType><Event><![CDATA[CLICK]]></Event><EventKey><![CDATA[I_SDUT_SIL]]></EventKey></xml>";
           out.println("原始消息:");
           if(list.get(3).equals("text"))
           {
               out.println(content1);
                out.println("解析结果:");
                out.print("FromUserName(来自)：");
                out.println(list.get(1));
                out.print("ToUserName(发送至)：");
                out.println(list.get(0));
                out.print("CreateTime(时间)：");
                 
                //时间转换
                int t = Integer.parseInt((String) list.get(2));
                SimpleDateFormat format = new SimpleDateFormat("yyyy/MM/dd hh:mm:ss");
                out.println(format.format((long)t*1000L));

                out.print("MsgType(消息类型)：");
                out.println(list.get(3));
                out.print("Content(文本内容)：");
                out.println(list.get(4));
                out.print("MsgId(文本消息标识号)：");
                out.println(list.get(5));
           }
           else
           {
               out.println(content2);
                out.println("解析结果:");
                out.print("FromUserName(来自)：");
                out.println(list.get(1));
                out.print("ToUserName(发送至)：");
                out.println(list.get(0));
                out.print("CreateTime(时间)：");
                 
                //时间转换
                int t = Integer.parseInt((String) list.get(2));
                SimpleDateFormat format = new SimpleDateFormat("yyyy/MM/dd hh:mm:ss");
                out.println(format.format((long)t*1000L));
                out.print("MsgType(消息类型)：");
                out.println(list.get(3));
                out.print("Event(事件)：");
                out.println(list.get(4));
                out.print("EventKey(事件值)：");
                out.println(list.get(5));
               
           }
    
           
            
        } catch (ParserConfigurationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SAXException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }    
    }
}
//解析xml文档
class TagValueHandler extends DefaultHandler{
    
    List <String> list = new ArrayList();

    private String currentTag;  //记住当前解析到的是什么标签
    @Override
    public void startElement(String uri, String localName, String qName,
            Attributes attributes) throws SAXException {
        
        currentTag = qName;
    }
    @Override
    public void endElement(String uri, String localName, String qName)
            throws SAXException {
        currentTag = null;
    }
    @Override
    public void characters(char[] ch, int start, int length)
            throws SAXException {
        
        if("ToUserName".equals(currentTag)){
         list.add(new String(ch,start,length));
        }
        if("FromUserName".equals(currentTag)){
            list.add(new String(ch,start,length));
           }
        if("CreateTime".equals(currentTag)){
            list.add(new String(ch,start,length));
           }
        if("MsgType".equals(currentTag)){
            list.add(new String(ch,start,length));
           }
        if("Content".equals(currentTag)){
            list.add(new String(ch,start,length));
           }
        else if("Event".equals(currentTag)){
            list.add(new String(ch,start,length));
        }
        if("MsgId".equals(currentTag)){
            list.add(new String(ch,start,length));
           }
        else if("EventKey".equals(currentTag))
        {
            list.add(new String(ch,start,length));
        }
    } 
   
    public List getList() {
        return list;
    }
}