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;
     }
 }