微信消息处理JAXP-dom解析

 package cn.lihainan.test;
 import java.io.BufferedReader;
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.PrintWriter;
 import java.text.SimpleDateFormat;

 import javax.servlet.ServletException;
 import javax.servlet.ServletRequest;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import javax.xml.parsers.DocumentBuilder;
 import javax.xml.parsers.DocumentBuilderFactory;
 import javax.xml.parsers.ParserConfigurationException;

 import org.dom4j.io.SAXReader;
 import org.dom4j.io.XMLWriter;

 import org.w3c.dom.Document;
 import org.w3c.dom.Node;

 public class Demo1 extends HttpServlet {
     public void doPost(HttpServletRequest request, HttpServletResponse response)
     throws ServletException, IOException {
         try {    // 将请求、响应的编码均设置为UTF-8（防止中文乱码）
         request.setCharacterEncoding("utf-8");
         response.setContentType("textml;charset=utf-8");
         InputStream inputStream = request.getInputStream();

         String result = readFromInputStream(inputStream);

         PrintWriter out = response.getWriter();

         out.println("原始消息：");

         out.println(result);

         //解析 建立document解析
         DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
         DocumentBuilder builder;
         builder = factory.newDocumentBuilder();

         InputStream xmlStream = new ByteArrayInputStream(result.getBytes("UTF-8"));
         Document document =  builder.parse(xmlStream);
         //定义节点    根据节点从document中找到要输出的
         Node ToUserName = document.getElementsByTagName("ToUserName").item(0);
         System.out.println(ToUserName.getTextContent());

         Node FromUserName = document.getElementsByTagName("FromUserName").item(0);
         System.out.println(FromUserName.getTextContent());

         Node MsgType= document.getElementsByTagName("MsgType").item(0);
         System.out.println(MsgType.getTextContent());

         Node Content = document.getElementsByTagName("Content").item(0);
         System.out.println(Content.getTextContent());

         Node MsgId= document.getElementsByTagName("MsgId").item(0);
         System.out.println(MsgId.getTextContent());

         out.println();
         //输出
         out.println("解析结果：");
         out.print("FromUserName(来自):");
         out.println(FromUserName.getTextContent());
         out.print("ToUserName(发送至):");
         out.println(ToUserName.getTextContent());
         out.print("CreateTime(时间):");

         Node createTime= document.getElementsByTagName("CreateTime").item(0);
         int t = Integer.parseInt(createTime.getTextContent());
         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(MsgType.getTextContent());
         out.print("Content(文本内容):");
         out.println(Content.getTextContent());
         out.print("MsgId(文件消息标识号):");
         out.println(MsgId.getTextContent());
         } catch (ParserConfigurationException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
         } catch (Exception e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
         }
     }

     //将输入流InputStream变为String
     public String readFromInputStream(InputStream in) throws IOException {
         ByteArrayOutputStream baos = new ByteArrayOutputStream();
         byte[] buffer = new byte[1024];
         int len = -1;
         while ((len = in.read(buffer)) != -1) {
             baos.write(buffer, 0, len);
         }
         baos.close();
         in.close();
         // 解析内容     看网上更改 输出中文乱码  但是未解决  已知输入流为gbk  输出为utf-8  求如何转换
         byte[] lens = baos.toByteArray();
         String result = new String(lens,"UTF-8");

         return result;

     }
 }