java 微信公众号开发入门 DEMO 可直接跑起来的

package com; import java.io.IOException; import java.io.PrintWriter; import java.util.Date; import java.util.Map; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.dom4j.DocumentException; /** *  * Servlet implementation class WeiXinServlet   */ public class WeiXinServlet extends HttpServlet { private static final long serialVersionUID = 1L; public WeiXinServlet() { super(); } // 接入doGet protected void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { System.out.println("---------------------111------------"); String signature = req.getParameter("signature"); String timestamp = req.getParameter("timestamp"); String nonce = req.getParameter("nonce"); String echostr = req.getParameter("echostr"); System.out.println("---------------------222------------"); PrintWriter out = res.getWriter(); // 校验成功返回echostr if (CheckUtil.checkSignature(signature, timestamp, nonce)) { out.print(echostr); } } /** * 接收并处理微信客户端发送的请求 */ 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(); } } }