关注微信公众号实现自动回复功能

接入微信公众平台开发，开发者需要按照如下步骤完成：

1.填写服务器配置

关注微信公众号实现自动回复功能

2.创建CoreServlet文件

package com.jlc.action;

import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Map;
import java.util.Random;

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

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.context.support.SpringBeanAutowiringSupport;

import com.jlc.bean.longya.WXCode;
import com.jlc.service.WXCodeService;
import com.jlc.util.wxsms.MessageUtil;
import com.jlc.util.wxsms.SignUtil;

/**
* 核心请求处理类
*
*/
public class CoreServlet extends HttpServlet {
@Override
public void init(ServletConfig config) throws ServletException {
SpringBeanAutowiringSupport.processInjectionBasedOnServletContext(this, config.getServletContext());
}
   @Autowired
   private WXCodeService wXCodeService;

   private static final long serialVersionUID = 4440739483644821986L;

   /**
   * 确认请求来自微信服务器
   */
   public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       // 微信加密签名
       String signature = request.getParameter("signature");
       // 时间戳
       String timestamp = request.getParameter("timestamp");
       // 随机数
       String nonce = request.getParameter("nonce");
       // 随机字符串
       String echostr = request.getParameter("echostr");

       PrintWriter out = response.getWriter();
       // 通过检验signature对请求进行校验，若校验成功则原样返回echostr，表示接入成功，否则接入失败
       if (SignUtil.checkSignature(signature, timestamp, nonce)) {
           out.print(echostr);
       }
       out.close();
       out = null;
   }

   /**
   * 处理微信服务器发来的消息
   */
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
System.out.println("进入doPost方法==========================");

   req.setCharacterEncoding("UTF-8");
resp.setCharacterEncoding("UTF-8");
PrintWriter out = resp.getWriter();
try {
Map<String,String> map = MessageUtil.xmlToMap(req);
String toUserName = map.get("ToUserName");
String fromUserName = map.get("FromUserName");
String msgType = map.get("MsgType");
String content = map.get("Content");
String message = "123456";
//判断请求是否事件类型 event
if(MessageUtil.MESSAGE_EVENT.equals(msgType)){
String eventType = map.get("Event");
//若是关注事件 subscribe
if(MessageUtil.EVENT_SUB.equals(eventType)){
// String mycontent = MessageUtil.menuText();
   String mycontent ="验证码:"+getRandom();
   System.out.println(mycontent);
   WXCode wxCode = new WXCode();
           wxCode.setCode(getRandom());
           wXCodeService.insert(getRandom());
message = MessageUtil.initText(toUserName, fromUserName, mycontent);
}
}
out.print(message);
System.out.println("doPost方法结束-------------");
} catch (Exception e) {
   e.printStackTrace();
out.close();
}

}

   //生成5位随机数
   public static String getRandom(){
SimpleDateFormat simpleDateFormat;
simpleDateFormat=new SimpleDateFormat("yyyyMMdd");
String date=simpleDateFormat.format(new Date());
Random random=new Random();
int rannum= (int)(random.nextDouble()*(99999-10000 + 1))+ 10000;
return rannum+"";
}

}

3.创建 MessageUtil 文件

package com.jlc.util.wxsms;

import java.io.IOException;
import java.io.InputStream;
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.jlc.common.message.request.TextMessage;
import com.thoughtworks.xstream.XStream;

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 EVENT_SUB = "subscribe";
public static final String EVENT_UNSUB = "unsubscribe";
public static final String EVENT_CLICK = "CLICK";
public static final String EVENT_VIEW = "VIEW";

/**
* xml转为map
* @param request
* @return
* @throws DocumentException
* @throws IOException
*/
public static Map<String, String> xmlToMap(HttpServletRequest request ) throws DocumentException, IOException
{
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 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 textMessageToXml(text);
}

public static String menuText(){
StringBuffer sb = new StringBuffer();
sb.append(" 你关注，\n");
return sb.toString();
}
}

4.创建 SignUtil 文件

package com.jlc.util.wxsms;

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

/**
* 请求校验工具类
*
* @date 2013-05-18
*/
public class SignUtil {
   // 与接口配置信息中的Token要一致
   private static String token = "immco";

   /**
   * 验证签名
   *
   * @param signature
   * @param timestamp
   * @param nonce
   * @return
   */
   public static boolean checkSignature(String signature, String timestamp, String nonce) {
       String[] arr = new String[] { token, timestamp, nonce };
       // 将token、timestamp、nonce三个参数进行字典序排序
       Arrays.sort(arr);
       StringBuilder content = new StringBuilder();
       for (int i = 0; i < arr.length; i++) {
           content.append(arr[i]);
       }
       MessageDigest md = null;
       String tmpStr = null;

       try {
           md = MessageDigest.getInstance("SHA-1");
           // 将三个参数字符串拼接成一个字符串进行sha1加密
           byte[] digest = md.digest(content.toString().getBytes());
           tmpStr = byteToStr(digest);
       } catch (NoSuchAlgorithmException e) {
           e.printStackTrace();
       }

       content = null;
       // 将sha1加密后的字符串可与signature对比，标识该请求来源于微信
       return tmpStr != null ? tmpStr.equals(signature.toUpperCase()) : false;
   }

   /**
   * 将字节数组转换为十六进制字符串
   *
   * @param byteArray
   * @return
   */
   private static String byteToStr(byte[] byteArray) {
       String strDigest = "";
       for (int i = 0; i < byteArray.length; i++) {
           strDigest += byteToHexStr(byteArray[i]);
       }
       return strDigest;
   }

   /**
   * 将字节转换为十六进制字符串
   *
   * @param mByte
   * @return
   */
   private static String byteToHexStr(byte mByte) {
       char[] Digit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
       char[] tempArr = new char[2];
       tempArr[0] = Digit[(mByte >>> 4) & 0X0F];
       tempArr[1] = Digit[mByte & 0X0F];

       String s = new String(tempArr);
       return s;
   }
}

5.CoreServlet在web.xml中的配置

<servlet>
       <servlet-name>coreServlet</servlet-name>
       <servlet-class>
           com.jlc.action.CoreServlet
       </servlet-class>
   </servlet>

   
   <servlet-mapping>
       <servlet-name>coreServlet</servlet-name>
       <url-pattern>/coreServlet</url-pattern>
</servlet-mapping>

6.参考地址

1. https://blog.****.net/Santiago_M/article/details/79111364?utm_source=blogkpcl15&utm_medium=distribute.pc_relevant_download.none-task-blog-baidujs-4.nonecase&depth_1-utm_source=distribute.pc_relevant_download.none-task-blog-baidujs-4.nonecase

2. https://blog.****.net/coco2d_x2014/article/details/78045527

关注微信公众号实现自动回复功能

相关推荐