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微信公众平台Token验证

2015-12-16 19:31 609 查看

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

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">
<!--
<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
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