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微信公众平台Token验证

2015-12-16 19:31 本站整理 浏览(28)

1. 首先给出测试项目的整体目录:


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
[code]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
[code]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。
[code]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

[code]<?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/javaeehttp://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

[code]<%@ 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">
<!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
</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。

8.源码地址