java微信公众号开发入门(3)--简单消息回复

为什么需要这俩工具类 因为传输方式为XMl

/**
	 * XML转map集合
	 * @param request
	 * @return
	 * @throws IOException
	 * @throws DocumentException
	 */
	public static Map<String, String> xmlToMap(HttpServletRequest request) throws IOException, DocumentException{
		Map<String, String> map = new HashMap<String, String>();
		SAXReader reader = new SAXReader();
		
		InputStream ins = request.getInputStream();
		Document doc = reader.read(ins);
		
		Element root = doc.getRootElement();
		List<Element> list = root.elements();
		
		for (Element e : list) {
			map.put(e.getName(), e.getText());			
		}
		
		ins.close();
		return map;
	}

	public static String textMessageToXml(TextMessage textMessage){
		XStream xstream = new XStream();
		xstream.alias("xml", textMessage.getClass());
		return xstream.toXML(textMessage);
	}

public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
 
        request.setCharacterEncoding("utf-8");
        response.setContentType("text/xml;charset=utf-8");
        PrintWriter out = response.getWriter();
        try {
            Map<String, String> map = MessageUtil.xmlToMap(request);
            String toUserName = map.get("ToUserName");
            String fromUserName = map.get("FromUserName");
            String msgType = map.get("MsgType");
            String content = map.get("Content");
             
            String message = null;
            if ("text".equals(msgType)) {                // 对文本消息进行处理
                TextMeaasge text = new TextMeaasge();
                text.setFromUserName(toUserName);         // 发送和回复是反向的
                text.setToUserName(fromUserName);
                text.setMsgType("text");
                text.setCreateTime(new Date().getTime());
                text.setContent("你发送的消息是：" + content);
                message = MessageUtil.textMessageToXML(text);
                System.out.println(message);            
            }
            out.print(message);                            // 将回应发送给微信服务器
        } catch (DocumentException e) {
            e.printStackTrace();
        }finally{
            out.close();
        }
    }