初识微信公众号开发

项目和软件地址：http://pan.baidu.com/s/1miRNZXe

外网映射工具：ngrok

命令行切换到ngrok目录，我的在D:\ngrok在命令行输入

d:

cd ngrok

ngrok -config ngrok.cfg -subdomain weixincs 8080

weixincs是你要使用的映射网址项目名，重复时记得更改.会等到以下内容

登陆微信公众平台，点击“基本配置”，配置如下内容

代码结构如下：

WeixinServlet代码：

package com.yql.servlet;

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;

import com.yql.po.TextMessage;
import com.yql.util.CheckUtil;
import com.yql.util.MessageUtil;

public class WeixinServlet extends HttpServlet {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		String signature = req.getParameter("signature");
		String timestamp = req.getParameter("timestamp");
		String nonce = req.getParameter("nonce");
		String echostr = req.getParameter("echostr");
		
		PrintWriter out = resp.getWriter();
		if(CheckUtil.checkSignature(signature, timestamp, nonce)){
			out.print(echostr);
		}
	}
	
	@Override
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");
		response.setCharacterEncoding("UTF-8");
		PrintWriter out = response.getWriter();
		try {
			Map map = MessageUtil.xmlToMap(request);
			String fromUserName = map.get("FromUserName");
			String toUserName = map.get("ToUserName");
			String msgType = map.get("MsgType");
			String content = map.get("Content");

			String message = null;

			if (MessageUtil.MESSAGE_TEXT.equals(msgType)) {
				if ("1".equals(content)) {
					message = MessageUtil.initText(toUserName, fromUserName,
							MessageUtil.firstMenu());
				} else if ("2".equals(content)) {
					message = MessageUtil.initText(toUserName, fromUserName,
							MessageUtil.secondMenu());
				} else if ("?".equals(content) || "？".equals(content)) {
					message = MessageUtil.initText(toUserName, fromUserName,
							MessageUtil.menuText());
				}
			} else if (MessageUtil.MESSAGE_EVENT.equals(msgType)) {
				String eventType = map.get("Event");
				if (MessageUtil.MESSAGE_SUBSCRIBE.equals(eventType)) {
					message = MessageUtil.initText(toUserName, fromUserName,
							MessageUtil.menuText());
				}
			}
			System.out.println(message);
			out.print(message);
		} catch (DocumentException e) {
			e.printStackTrace();
		} finally {
			out.close();
		}
	}
}

TextMessage.java

package com.yql.po;

public class TextMessage {
	private String ToUserName;
	private String FromUserName;
	private long CreateTime;
	private String MsgType;
	private String Content;
	private String MsgId;


	public String getToUserName() {
		return ToUserName;
	}

	public void setToUserName(String toUserName) {
		ToUserName = toUserName;
	}

	public String getFromUserName() {
		return FromUserName;
	}

	public void setFromUserName(String fromUserName) {
		FromUserName = fromUserName;
	}

	public long getCreateTime() {
		return CreateTime;
	}

	public void setCreateTime(long createTime) {
		CreateTime = createTime;
	}

	public String getMsgType() {
		return MsgType;
	}

	public void setMsgType(String msgType) {
		MsgType = msgType;
	}

	public String getContent() {
		return Content;
	}

	public void setContent(String content) {
		Content = content;
	}

	public String getMsgId() {
		return MsgId;
	}

	public void setMsgId(String msgId) {
		MsgId = msgId;
	}
}

CheckUtil.java

package com.yql.util;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;

public class CheckUtil {
private static final String TOKEN ="xxxxx";
	
	public static boolean checkSignature(String signature,String timestamp,String nonce){
		String[] arr = new String[]{TOKEN,timestamp,nonce};
		//排序
		Arrays.sort(arr);
		//生成字符串
		StringBuffer sb = new StringBuffer();
		for(int i=0;i>> 4 & 0xf];
	            buf[k++] = hexDigits[byte0 & 0xf];
	        }
	        return new String(buf);
	    } catch (NoSuchAlgorithmException e) {
	        e.printStackTrace();
	    } catch (UnsupportedEncodingException e) {
	        e.printStackTrace();
	    }
		return "";
	}
}

MessageUtil.java

package com.yql.util;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import com.thoughtworks.xstream.XStream;
import com.yql.po.TextMessage;

public class MessageUtil {
	
	public static final String MESSAGE_TEXT = "text";
	public static final String MESSAGE_IMAGE = "image";
	public static final String MESSAGE_VOICE = "voice";
	public static final String MESSAGE_VIDEO = "video";
	public static final String MESSAGE_LINK = "link";
	public static final String MESSAGE_LOCATION = "location";
	public static final String MESSAGE_EVENT = "event";
	public static final String MESSAGE_SUBSCRIBE = "subscribe";
	public static final String MESSAGE_UNSUBSCRIBE = "unsubscribe";
	public static final String MESSAGE_CLICK = "CLICK";
	public static final String MESSAGE_VIEW = "VIEW";
	
	@SuppressWarnings("unchecked")
	public static Map xmlToMap(HttpServletRequest request ) throws IOException, DocumentException{
		SAXReader reader = new SAXReader();
		Map map = new HashMap();
		
		InputStream input = request.getInputStream();
		Document doc = reader.read(input);
		
		List list = new ArrayList();
		
		Element root = doc.getRootElement();
		
		list = root.elements();
		
		for(Element e: list){
			map.put(e.getName(), e.getText());
		}
		input.close();
		return map;
	}
	
	public static String initText(String toUserName, String fromUserName,
			String content) {
		TextMessage text = new TextMessage();
		text.setFromUserName(toUserName);
		text.setToUserName(fromUserName);
		text.setMsgType(MESSAGE_TEXT);
		text.setCreateTime(new Date().getTime());
		text.setContent(content);
		return MessageUtil.textMessageToXml(text);
	}

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

	/**
	 * 主菜单
	 * 
	 * @return
	 */
	public static String menuText() {
		StringBuffer sb = new StringBuffer();
		sb.append("欢迎你的关注，请按照菜单提示操作：\n\n");
		sb.append("1、近期好看的电影\n");
		sb.append("2、87届奥斯卡获奖电影\n");
		sb.append("回复？调出帮助菜单");
		return sb.toString();
	}

	/**
	 * 回复1的菜单
	 * @return
	 */
	public static String firstMenu() {
		StringBuffer sb = new StringBuffer();
		sb.append("近期口碑不错的电影推荐——《大圣归来》，很不错，建议体验一下哦~");
		return sb.toString();
	}

	/**
	 * 回复2的菜单
	 * @return
	 */
	public static String secondMenu() {
		StringBuffer sb = new StringBuffer();
		sb.append("《消失的爱人》——87届奥斯卡最佳女主角获奖电影，爱情悬疑类型电影迷的最爱。");
		return sb.toString();
	}
	
}

web.xml

  
    weixinServlet
    com.yql.servlet.WeixinServlet
  
  
    weixinServlet
    /wx.do