微信公众平台Token验证

客官°小女子只卖身不卖艺 2022-08-18 11:56 202阅读 0赞

## 1. 首先给出测试项目的整体目录： ##

![：][20151216185752872]

## 2. CoreServlet类： ##

当get请求的时候会执行get方法，post请求的时候会执行post方法，分别来处理不同的请求

package com.zjn.servlet;
    
    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;
    
    import com.zjn.util.SignUtil;
    
    /** * 核心请求处理类 * */
    @SuppressWarnings("serial")
    public class CoreServlet extends HttpServlet { 
    
    
        /** * 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);
                System.out.println("微信服务验证成功！");
            }
            out.close();
            out = null;
        }
    
        /** * 处理微信服务器发来的消息 */
        public void doPost(HttpServletRequest request, HttpServletResponse response)
                throws ServletException, IOException {
        }
    
    }

## 3. SignUtil类： ##

上面类中用到了SignUtil 类，用来验证签名

package com.zjn.util;
    
    import java.security.MessageDigest;
    import java.security.NoSuchAlgorithmException;
    import java.util.Arrays;
    
    import com.zjn.constants.Constant;
    
    
    /** * 请求校验工具类 * */
    public class SignUtil { 
    
        /** * 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[] { Constant.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;
        }
    }

## 4.Constant.java ##

我们看到 checkSignature 这个方法里使用到了Constant.TOKEN ，这个token，我声明的一个常量，放在Constant.java这个类里面， 要与微信配置接口里面的token值一样。

package com.zjn.constants;
    
    public class Constant { 
        // 与接口配置信息中的Token要一致
        public final static String TOKEN = "tongchema163";
    }

## 5.web.xml的配置 ##

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

## 6.index.jsp ##

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
    <% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %>
    
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
    <head>
    <base href="<%=basePath%>">
    
    <title>微信公共平台开发者接口</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    
    </head>
    
    <body>
    <h1>仝家班微信公共平台开发者接口</h1>
    </body>
    </html>

## 7.测试 ##

我们的代码已经写完了，现在访问请求地址试试，如果报错如下，说明代码没问题了，然后需要将代码发布到外网上，再把上面填的Token，和外网的URL在微信公众平台进行配置就好了。  
![20151216192229249][]

8.源码地址  
[https://download.csdn.net/download/jianyuerensheng/9362227][https_download.csdn.net_download_jianyuerensheng_9362227]

[20151216185752872]: /images/20220731/44eb4ba8cf104736b27c392c5cd8254b.png
[20151216192229249]: /images/20220731/0d6a461a886f4dc1b19ff602c1ac4b9a.png
[https_download.csdn.net_download_jianyuerensheng_9362227]: https://download.csdn.net/download/jianyuerensheng/9362227