【fastweixin框架教程1】一分钟快速搭建微信公众平台JAVA服务器

  目前网上有很多，一分钟微信公众平台教程，但很少有快速搭建微信公众平台服务器教程。

  本文以fastweixin框架作为基础，以微信公众平台企业号作为目标，快速搭建微信公众平台服务器。

  本文目标：

  1.极其方便的实现微信公众平台服务端开发

  2、完成服务器绑定

  3、实现用户消息监听

  本文技术要求：要求大家熟悉JAVA基本语言和servlet

  很多大学同学可能对servlet不太熟悉，推荐大家学习书：《head first servlets and jsp》，除此之外不要求swing awt这些知识。

  首先这个框架已经为我们实现基本结构，但本人从实践中发现里面有很多需要自己扩充修改BUG的地方，本人使用完全自己实现自己的WeixinServletSupport方式。

  0、修改JDK：

  微信企业号均使用消息安全模式，安全模式都是AES加密，AES是米国政府采用的加密，所以强加密算法在早期是出口限制，同时在  jdk中有所限制，导致想使用安全模式，必须修改jdk内部的jar包替换为  JCE Unlimited Strength。

  否则你会收到异常java.security.InvalidKeyException:illegal Key Size

下面代码修改自WeixinServletSupport

说明：

1、里面有个MyMessageUtil，后续文章会讲述，修改适应weblogic的，如果不需要可以换回原框架MessageUtil

2、用户发来所有信息都可以处理，可以自行修改代码。

3、bindServer进行修改处理判断没有参数调用情况。

package com.luozhuang;

import com.github.sd4324530.fastweixin.company.handle.QYEventHandle;
import com.github.sd4324530.fastweixin.company.handle.QYMessageHandle;
import com.github.sd4324530.fastweixin.company.message.req.QYBaseEvent;
import com.github.sd4324530.fastweixin.company.message.req.QYBaseReq;
import com.github.sd4324530.fastweixin.company.message.req.QYBaseReqMsg;
import com.github.sd4324530.fastweixin.company.message.req.QYBatchJobEvent;
import com.github.sd4324530.fastweixin.company.message.req.QYEnterAgentEvent;
import com.github.sd4324530.fastweixin.company.message.req.QYEventType;
import com.github.sd4324530.fastweixin.company.message.req.QYImageReqMsg;
import com.github.sd4324530.fastweixin.company.message.req.QYLocationEvent;
import com.github.sd4324530.fastweixin.company.message.req.QYLocationReqMsg;
import com.github.sd4324530.fastweixin.company.message.req.QYMenuEvent;
import com.github.sd4324530.fastweixin.company.message.req.QYReqType;
import com.github.sd4324530.fastweixin.company.message.req.QYScanCodeEvent;
import com.github.sd4324530.fastweixin.company.message.req.QYSendPicInfoEvent;
import com.github.sd4324530.fastweixin.company.message.req.QYTextReqMsg;
import com.github.sd4324530.fastweixin.company.message.req.QYVideoReqMsg;
import com.github.sd4324530.fastweixin.company.message.req.QYVoiceReqMsg;
import com.github.sd4324530.fastweixin.company.message.resp.QYBaseRespMsg;
import com.github.sd4324530.fastweixin.company.message.resp.QYTextRespMsg;

import com.qq.weixin.mp.aes.AesException;
import com.qq.weixin.mp.aes.WXBizMsgCrypt;

import com.github.sd4324530.fastweixin.servlet.QYWeixinSupport;

import com.github.sd4324530.fastweixin.util.BeanUtil;

import com.github.sd4324530.fastweixin.util.CollectionUtil;

import com.github.sd4324530.fastweixin.util.StrUtil;

import com.fastwixinextend.MyMessageUtil;

import java.io.IOException;
import java.io.PrintWriter;

import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class MainServernSupport {
	private static final Logger LOG = LoggerFactory.getLogger(QYWeixinSupport.class);
	private static final Object LOCK = new Object();
	protected String fromUserName, toUserName;

	/**
	 * 微信消息处理器列表
	 */
	private static List<QYMessageHandle> messageHandles;

	/**
	 * 子类重写，加入自定义的微信消息处理器，细化消息的处理
	 *
	 * @return 微信消息处理器列表
	 */
	protected List<QYMessageHandle> initMessageHandles() {
		return null;
	}

	/**
	 * 子类重写，加入自定义的微信事件处理器，细化消息的处理
	 *
	 * @return 微信事件处理器列表
	 */
	protected List<QYEventHandle> initEventHandles() {
		return null;
	}

	/**
	 * 微信事件处理器列表
	 */
	private static List<QYEventHandle> eventHandles;

	public MainServernSupport() {
		super();
	}

	/**
	 * @return 你的回调token
	 */
	public static String getToken() {
		return "luozhuang";
	}

	/**
	 * @return "这里填写你的企业corpid"
	 */
	public static String getCropId() {
		return "luozhuang";
	}

	public static String getAgentID() {
		return "luozhuang";
	}

	/**
	 * @return "你的回调encodingAesKey "
	 */
	public static String getAESKey() {
		return "luozhuang";
	}

	public static String getAPPSecret() {
		return "luozhuang";
	}

	/**
     * 绑定服务器的方法
     * @param request
     * @param response
     */
    public void bindServer(HttpServletRequest request,
                           HttpServletResponse response) {
        PrintWriter pw = null;
        try {
            pw = response.getWriter();
        } catch (IOException e) {
            LOG.debug(e);
        }
        if (StrUtil.isBlank(getToken()) || StrUtil.isBlank(getAESKey()) ||
            StrUtil.isBlank(getCropId())) {
            pw.write("成功");
            pw.flush();
            pw.close();
            return;
        }
        if (StrUtil.isBlank(request.getParameter("echostr")) || StrUtil.isBlank(request.getParameter("msg_signature")) || StrUtil.isBlank(request.getParameter("timestamp")) ||
                StrUtil.isBlank(request.getParameter("nonce"))) {
                pw.write("成功");
                pw.flush();
                pw.close();
                return;
            }
        try {
            WXBizMsgCrypt pc =
                new WXBizMsgCrypt(getToken(), getAESKey(), getCropId());
            String echoStr =
                pc.VerifyURL(request.getParameter("msg_signature"),
                             request.getParameter("timestamp"),
                             request.getParameter("nonce"),
                             request.getParameter("echostr"));
            pw.write(echoStr);
            pw.flush();
            pw.close();
        } catch (AesException e) {
        	if (StrUtil.isNotBlank(e.OrginexceptionMessage)) {
        	      LOG.debug(e.OrginexceptionMessage);
			}
            LOG.debug("msg_signature",request.getParameter("msg_signature"));
            LOG.debug("timestamp",request.getParameter("timestamp"));
            LOG.debug("nonce",request.getParameter("nonce"));
            LOG.debug("echostr",request.getParameter("echostr"));
            LOG.debug(e);
        }
        finally
        {
            pw.write("");
            pw.flush();
            pw.close();
        }
       
    }

	/**
	 * 处理微信服务器发来的请求方法
	 *
	 * @param request
	 *            http请求对象
	 * @return 处理消息的结果，已经是接口要求的XML的报文了
	 */
	public String processRequest(HttpServletRequest request) {

		try {
			Map<String, Object> reqMap = MyMessageUtil.parseXml(request, getToken(), getCropId(), getAESKey());
			fromUserName = (String) reqMap.get("FromUserName");
			toUserName = (String) reqMap.get("ToUserName");

			String result = ProcessMessage(request, reqMap);
			return result;
		} catch (Exception e) {
			LOG.debug(e);
		}
		return null;
	}

	/**
	 * 处理微信传来信息
	 * 
	 * @param request
	 * @param reqMap
	 * @return
	 */
	public String ProcessMessage(HttpServletRequest request, Map<String, Object> reqMap) {
		String msgType = (String) reqMap.get("MsgType");

		LOG.debug("收到消息，消息类型：{}", msgType);

		QYBaseRespMsg msg = null;
		/// BUG修改：equalsIgnoreCase代替equals，因为微信传来的Type不分大小写
		if (msgType.equalsIgnoreCase(QYReqType.EVENT)) {
			String eventType = (String) reqMap.get("Event");
			if (QYEventType.SUBSCRIBE.equals(eventType)) {
				QYBaseEvent event = new QYBaseEvent();
				buildBasicEvent(reqMap, event);
				msg = handleSubScribe(event);
				if (BeanUtil.isNull(msg)) {
					msg = processEventHandle(event);
				}

			} else if (QYEventType.UNSUBSCRIBE.equalsIgnoreCase(eventType)) {
				QYBaseEvent event = new QYBaseEvent();
				buildBasicEvent(reqMap, event);
				msg = handleUnsubscribe(event);
				if (BeanUtil.isNull(msg)) {
					msg = processEventHandle(event);
				}
			} else if (QYEventType.CLICK.equalsIgnoreCase(eventType)) {
				String eventKey = (String) reqMap.get("EventKey");
				LOG.debug("eventKey:{}", eventKey);
				QYMenuEvent event = new QYMenuEvent(eventKey);
				buildBasicEvent(reqMap, event);
				msg = handleMenuClickEvent(event);
				if (BeanUtil.isNull(msg)) {
					msg = processEventHandle(event);
				}
			} else if (QYEventType.VIEW.equalsIgnoreCase(eventType)) {
				String eventKey = (String) reqMap.get("EventKey");
				LOG.debug("eventKey:{}", eventKey);
				QYMenuEvent event = new QYMenuEvent(eventKey);
				buildBasicEvent(reqMap, event);
				msg = handleMenuViewEvent(event);
				if (BeanUtil.isNull(msg)) {
					msg = processEventHandle(event);
				}
			} else if (QYEventType.LOCATION.equalsIgnoreCase(eventType)) {
				double latitude = Double.parseDouble((String) reqMap.get("Latitude"));
				double longitude = Double.parseDouble((String) reqMap.get("Longitude"));
				double precision = Double.parseDouble((String) reqMap.get("Precision"));
				QYLocationEvent event = new QYLocationEvent(latitude, longitude, precision);
				buildBasicEvent(reqMap, event);
				msg = handleLocationEvent(event);
				if (BeanUtil.isNull(msg)) {
					msg = processEventHandle(event);
				}
			} else if (QYEventType.SCANCODEPUSH.equalsIgnoreCase(eventType)
					|| QYEventType.SCANCODEWAITMSG.equalsIgnoreCase(eventType)) {
				String eventKey = (String) reqMap.get("EventKey");
				Map<String, Object> scanCodeInfo = (Map<String, Object>) reqMap.get("ScanCodeInfo");
				String scanType = (String) scanCodeInfo.get("ScanType");
				String scanResult = (String) scanCodeInfo.get("ScanResult");
				QYScanCodeEvent event = new QYScanCodeEvent(eventKey, scanType, scanResult);
				buildBasicEvent(reqMap, event);
				msg = handleScanCodeEvent(event);
				if (BeanUtil.isNull(msg)) {
					msg = processEventHandle(event);
				}
			} else if (QYEventType.PICPHOTOORALBUM.equalsIgnoreCase(eventType)
					|| QYEventType.PICSYSPHOTO.equalsIgnoreCase(eventType)
					|| QYEventType.PICWEIXIN.equalsIgnoreCase(eventType)) {
				String eventKey = (String) reqMap.get("EventKey");
				Map<String, Object> sendPicsInfo = (Map<String, Object>) reqMap.get("SendPicsInfo");
				int count = Integer.parseInt((String) sendPicsInfo.get("Count"));
				List<Map> picList = (List) sendPicsInfo.get("PicList");
				QYSendPicInfoEvent event = new QYSendPicInfoEvent(eventKey, count, picList);
				buildBasicEvent(reqMap, event);
				msg = handleSendPicsInfoEvent(event);
				if (BeanUtil.isNull(msg)) {
					msg = processEventHandle(event);
				}
			} else if (QYEventType.ENTERAGENT.equalsIgnoreCase(eventType)) {
				QYEnterAgentEvent event = new QYEnterAgentEvent();
				buildBasicEvent(reqMap, event);
				msg = handleEnterAgentEvent(event);
				if (BeanUtil.isNull(msg)) {
					msg = processEventHandle(event);
				}
			} else if (QYEventType.BATCHJOBRESULT.equalsIgnoreCase(eventType)) {
				Map<String, Object> batchJob = (Map<String, Object>) reqMap.get("BatchJob");
				String jobId = (String) batchJob.get("JobId");
				String jobType = (String) batchJob.get("JobType");
				int errCode = (Integer) batchJob.get("ErrCode");
				String errMsg = (String) batchJob.get("ErrMsg");
				QYBatchJobEvent event = new QYBatchJobEvent(jobId, jobType, errCode, errMsg);
				buildBasicEvent(reqMap, event);
				msg = handleBatchJobEvent(event);
				if (BeanUtil.isNull(msg)) {
					msg = processEventHandle(event);
				}
			}
		} else {
			if (QYReqType.TEXT.equalsIgnoreCase(msgType)) {
				String content = (String) reqMap.get("Content");
				LOG.debug("文本消息内容：{}", content);
				QYTextReqMsg textReqMsg = new QYTextReqMsg(content);
				buildBasicReqMsg(reqMap, textReqMsg);
				msg = handleTextMsg(textReqMsg);
				if (BeanUtil.isNull(msg)) {
					msg = processMessageHandle(textReqMsg);
				}
			} else if (QYReqType.IMAGE.equalsIgnoreCase(msgType)) {
				String picUrl = (String) reqMap.get("PicUrl");
				String mediaId = (String) reqMap.get("MediaId");
				QYImageReqMsg imageReqMsg = new QYImageReqMsg(picUrl, mediaId);
				buildBasicReqMsg(reqMap, imageReqMsg);
				msg = handleImageMsg(imageReqMsg);
				if (BeanUtil.isNull(msg)) {
					msg = processMessageHandle(imageReqMsg);
				}
			} else if (QYReqType.VOICE.equalsIgnoreCase(msgType)) {
				String format = (String) reqMap.get("Format");
				String mediaId = (String) reqMap.get("MediaId");
				QYVoiceReqMsg voiceReqMsg = new QYVoiceReqMsg(mediaId, format);
				buildBasicReqMsg(reqMap, voiceReqMsg);
				msg = handleVoiceMsg(voiceReqMsg);
				if (BeanUtil.isNull(msg)) {
					msg = processMessageHandle(voiceReqMsg);
				}
			} else if (QYReqType.VIDEO.equalsIgnoreCase(msgType)) {
				String thumbMediaId = (String) reqMap.get("ThumbMediaId");
				String mediaId = (String) reqMap.get("MediaId");
				QYVideoReqMsg videoReqMsg = new QYVideoReqMsg(mediaId, thumbMediaId);
				buildBasicReqMsg(reqMap, videoReqMsg);
				msg = handleVideoMsg(videoReqMsg);
				if (BeanUtil.isNull(msg)) {
					msg = processMessageHandle(videoReqMsg);
				}
			} else if (QYReqType.SHORT_VIDEO.equalsIgnoreCase(msgType)) {
				String thumbMediaId = (String) reqMap.get("ThumbMediaId");
				String mediaId = (String) reqMap.get("MediaId");
				QYVideoReqMsg videoReqMsg = new QYVideoReqMsg(mediaId, thumbMediaId);
				buildBasicReqMsg(reqMap, videoReqMsg);
				msg = handleShortVideoMsg(videoReqMsg);
				if (BeanUtil.isNull(msg)) {
					msg = processMessageHandle(videoReqMsg);
				}
			} else if (QYReqType.LOCATION.equalsIgnoreCase(msgType)) {
				double locationX = Double.parseDouble((String) reqMap.get("Location_X"));
				double locationY = Double.parseDouble((String) reqMap.get("Location_Y"));

				// BUG：Scale是首字母大写
				int scale = Integer.parseInt((String) reqMap.get("Scale"));
				String label = (String) reqMap.get("Label");
				// BUG：locationY 写成locationX
				QYLocationReqMsg locationReqMsg = new QYLocationReqMsg(locationX, locationY, scale, label);
				buildBasicReqMsg(reqMap, locationReqMsg);
				msg = handleLocationMsg(locationReqMsg);
				if (BeanUtil.isNull(msg)) {
					msg = processMessageHandle(locationReqMsg);
				}
			}
		}

		String result = "";
		if (BeanUtil.nonNull(msg)) {
			msg.setFromUserName(toUserName);
			msg.setToUserName(fromUserName);
			result = msg.toXml();
			/// BUG:缺少这个标签
			result = "<xml>" + result + "</xml>";
			LOG.debug("回复内容：{}", result);
			try {
				WXBizMsgCrypt pc = new WXBizMsgCrypt(getToken(), getAESKey(), getCropId());
				result = pc.EncryptMsg(result, request.getParameter("timestamp"), request.getParameter("nonce"));
				LOG.debug("加密后密文：{}", result);
			} catch (AesException e) {
				LOG.error("加密异常", e);
			}
		}
		return result;
	}

	/**
	 * 处理文本消息，有需要时子类重写
	 *
	 * @param msg
	 *            请求消息对象
	 * @return 响应消息对象
	 */
	protected QYBaseRespMsg handleTextMsg(QYTextReqMsg msg) {
		return new QYTextRespMsg("感谢您发送文本");
	}

	/**
	 * 处理图片消息，有需要时子类重写
	 *
	 * @param msg
	 *            请求消息对象
	 * @return 响应消息对象
	 */
	protected QYBaseRespMsg handleImageMsg(QYImageReqMsg msg) {
		return new QYTextRespMsg("感谢您上报图片");
	}

	/**
	 * 处理语音消息，有需要时子类重写
	 *
	 * @param msg
	 *            请求消息对象
	 * @return 响应消息对象
	 */
	protected QYBaseRespMsg handleVoiceMsg(QYVoiceReqMsg msg) {
		return new QYTextRespMsg("感谢您上报语音");
	}

	/**
	 * 处理视频消息，有需要时子类重写
	 *
	 * @param msg
	 *            请求消息对象
	 * @return 响应消息对象
	 */
	protected QYBaseRespMsg handleVideoMsg(QYVideoReqMsg msg) {
		return new QYTextRespMsg("感谢您上报视频");
	}

	/**
	 * 处理小视频消息，有需要时子类重写
	 *
	 * @param msg
	 *            请求消息对象
	 * @return 响应消息对象
	 */
	protected QYBaseRespMsg handleShortVideoMsg(QYVideoReqMsg msg) {
		return new QYTextRespMsg("感谢您上报视频");
	}

	/**
	 * 处理地理位置消息，有需要时子类重写
	 *
	 * @param msg
	 *            请求消息对象
	 * @return 响应消息对象
	 */
	protected QYBaseRespMsg handleLocationMsg(QYLocationReqMsg msg) {
		return new QYTextRespMsg("感谢您上报地理位置");
	}

	/**
	 * 处理地理位置事件，有需要时子类重写
	 *
	 * @param event
	 *            地理位置事件对象
	 * @return 响应消息对象
	 */
	protected QYBaseRespMsg handleLocationEvent(QYLocationEvent event) {
		return new QYTextRespMsg("感谢您上报地理位置");
	}

	/**
	 * 处理菜单点击事件，有需要时子类重写
	 *
	 * @param event
	 *            菜单点击事件对象
	 * @return 响应消息对象
	 */
	protected QYBaseRespMsg handleMenuClickEvent(QYMenuEvent event) {

		String eventKey = event.getEventKey();
		QYTextRespMsg textMessage = new QYTextRespMsg();
		// 根据key值判断用户点击的按钮
		if (eventKey.equals("登录")) {
			textMessage
					.setContentBuilder("登录");

		}
		
		return textMessage;
	}

	/**
	 * 处理菜单跳转事件，有需要时子类重写
	 *
	 * @param event
	 *            菜单跳转事件对象
	 * @return 响应消息对象
	 */
	protected QYBaseRespMsg handleMenuViewEvent(QYMenuEvent event) {
		return new QYTextRespMsg("感谢菜单跳转");
	}

	/**
	 * 处理菜单扫描推事件，有需要时子类重写
	 * 
	 * @param event
	 * @return
	 */
	protected QYBaseRespMsg handleScanCodeEvent(QYScanCodeEvent event) {
		return new QYTextRespMsg("感谢您扫描二维码");
	}

	/**
	 * 处理菜单弹出相册事件，有需要时子类重写
	 *
	 * @param event
	 *            菜单弹出相册事件
	 * @return 响应的消息对象
	 */
	protected QYBaseRespMsg handleSendPicsInfoEvent(QYSendPicInfoEvent event) {
		return handleDefaultEvent(event);
	}

	/**
	 * 处理用户进入应用事件，有需要时子类重写
	 *
	 * @param event
	 *            添加应用事件对象
	 * @return 响应的消息对象
	 */
	protected QYBaseRespMsg handleEnterAgentEvent(QYEnterAgentEvent event) {
		return new QYTextRespMsg("感谢进入应用");
	}

	/**
	 * 处理异步任务通知事件，有需要时子类重写
	 *
	 * @param event
	 *            添加通知事件对象
	 * @return 响应的消息对象
	 */
	protected QYBaseRespMsg handleBatchJobEvent(QYBatchJobEvent event) {
		return handleDefaultEvent(event);
	}

	/**
	 * 处理添加关注事件，有需要时子类重写
	 *
	 * @param event
	 *            添加关注事件对象
	 * @return 响应消息对象
	 */
	protected QYBaseRespMsg handleSubScribe(QYBaseEvent event) {
		return new QYTextRespMsg("感谢您的关注");
	}

	/**
	 * 处理取消关注事件，有需要时子类重写
	 *
	 * @param event
	 *            取消关注事件对象
	 * @return 响应消息对象
	 */
	protected QYBaseRespMsg handleUnsubscribe(QYBaseEvent event) {
		return null;
	}

	protected QYBaseRespMsg handleDefaultMsg(QYBaseReqMsg msg) {
		return null;
	}

	protected QYBaseRespMsg handleDefaultEvent(QYBaseEvent event) {
		return null;
	}

	/**
	 * 自定义的消息事件处理
	 * 
	 * @param msg
	 *            微信消息
	 * @return
	 */
	private QYBaseRespMsg processMessageHandle(QYBaseReqMsg msg) {
		if (CollectionUtil.isEmpty(messageHandles)) {
			synchronized (LOCK) {
				messageHandles = this.initMessageHandles();
			}
		}
		if (CollectionUtil.isNotEmpty(messageHandles)) {
			for (QYMessageHandle messageHandle : messageHandles) {
				QYBaseRespMsg resultMsg = null;
				boolean result;
				try {
					result = messageHandle.beforeHandle(msg);
				} catch (Exception e) {
					result = false;
				}
				if (result) {
					resultMsg = messageHandle.handle(msg);
				}
				if (BeanUtil.nonNull(resultMsg)) {
					return resultMsg;
				}
			}
		}
		return null;
	}

	/**
	 * 自定义的消息事件处理
	 * 
	 * @param event
	 * @return
	 */
	private QYBaseRespMsg processEventHandle(QYBaseEvent event) {
		if (CollectionUtil.isEmpty(eventHandles)) {
			synchronized (LOCK) {
				eventHandles = this.initEventHandles();
			}
		}
		if (CollectionUtil.isNotEmpty(eventHandles)) {
			for (QYEventHandle eventHandle : eventHandles) {
				QYBaseRespMsg resultMsg = null;
				boolean result;
				try {
					result = eventHandle.beforeHandle(event);
				} catch (Exception e) {
					result = false;
				}
				if (result) {
					resultMsg = eventHandle.handle(event);
				}
				if (BeanUtil.nonNull(resultMsg)) {
					return resultMsg;
				}
			}
		}
		return null;
	}

	private void buildBasicReqMsg(Map<String, Object> reqMap, QYBaseReqMsg reqMsg) {
		addBasicReqParams(reqMap, reqMsg);
		reqMsg.setMsgId((String) reqMap.get("MsgId"));
	}

	private void buildBasicEvent(Map<String, Object> reqMap, QYBaseEvent event) {
		addBasicReqParams(reqMap, event);
		event.setEvent((String) reqMap.get("Event"));
	}

	private void addBasicReqParams(Map<String, Object> reqMap, QYBaseReq req) {
		req.setMsgType((String) reqMap.get("MsgType"));
		req.setFromUserName((String) reqMap.get("FromUserName"));
		req.setToUserName((String) reqMap.get("ToUserName"));
		req.setCreateTime(Long.parseLong((String) reqMap.get("CreateTime")));
	}

}

package com.luozhuang;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 请求处理的核心类
 *
 */
public class CoreServletDemo extends HttpServlet {

    private static final long serialVersionUID = 4440739483644821986L;
    MainServernSupport support = new MainServernSupport();

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");
        support.bindServer(request, response);
    }

    /**
     * 重写servlet中的post方法，用于接收微信服务器发来的消息，置为final方法，用户已经无需重写这个方法啦
     *
     * @param request http请求对象
     * @param response http响应对象
     * @throws ServletException servlet异常
     * @throws IOException IO异常
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 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.setCharacterEncoding("UTF-8");
        String resp = support.processRequest(request);
        PrintWriter out = response.getWriter();
        out.print(resp);
        out.close();
    }
}