微信公众号开发一：接入指南

1.新建一个web project，我取的项目名称是weixin，使用8080端口，新建一个WeiXinServlet，web.xml如下

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">  <display-name></display-name>    <servlet>    <servlet-name>WeiXinServlet</servlet-name>    <servlet-class>com.gf.web.controller.WeiXinServlet</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>WeiXinServlet</servlet-name>    <url-pattern>/weiXinServlet</url-pattern>  </servlet-mapping>      <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list></web-app>

项目运行之后，我们就可以通过http://localhost:8080/weixin/weiXinServlet访问该servlet

2.下载ngrok，下载之后双击打开，在命令窗口输入ngrok http 8080回车

我马赛克注释掉的就是映射的外网访问地址，和后面的localhsot:8080访问一样。

http://注释掉/weixin/weiXinServlet和http://localhost:8080/weixin/weiXinServlet访问的是刚才新建的WeiXinServlet

3.登录微信公众号，我是申请的测试账号，左侧菜单“开发”下“基本配置”，配置如下

4.WeiXinServlet代码如下

package com.gf.web.controller;import java.io.IOException;import java.io.UnsupportedEncodingException;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import java.util.Arrays;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class WeiXinServlet extends HttpServlet {private static String token = "pangpang";public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String signature = request.getParameter("signature");String timestamp = request.getParameter("timestamp");String nonce = request.getParameter("nonce");String echostr = request.getParameter("echostr");System.out.println(signature);//System.out.println(timestamp);//System.out.println(nonce);//System.out.println(echostr);if(checkSignature(signature, timestamp, nonce)){            response.getWriter().print(echostr);        }}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {}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 content = new StringBuffer();for (int i = 0; i < arr.length; i++) {content.append(arr[i]);}// sha1加密String temp = getSha1(content.toString());System.out.println(temp);return temp.equals(signature);}public static String getSha1(String str) {if (null == str || 0 == str.length()) {return null;}char[] hexDigits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9','a', 'b', 'c', 'd', 'e', 'f' };try {MessageDigest mdTemp = MessageDigest.getInstance("SHA1");mdTemp.update(str.getBytes("UTF-8"));byte[] md = mdTemp.digest();int j = md.length;char[] buf = new char[j * 2];int k = 0;for (int i = 0; i < j; i++) {byte byte0 = md[i];buf[k++] = hexDigits[byte0 >>> 4 & 0xf];buf[k++] = hexDigits[byte0 & 0xf];}return new String(buf);} catch (NoSuchAlgorithmException e) {e.printStackTrace();return null;} catch (UnsupportedEncodingException e) {e.printStackTrace();return null;}}}

5.提交第三步的配置，bingo。