JAVA做微信后台开发——微信接入验证

微信接入验证

package weixin;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.weixin.common.SignUtil;

import com.weixin.process.WechatProcess;

import java.io.BufferedReader;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

/**

* Servlet implementation class WechatServlet

*/

@WebServlet("/WechatServlet")

public class WechatServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

/**

* @see HttpServlet#HttpServlet()

*/

public WechatServlet() {

super();

// TODO Auto-generated constructor stub

}

/**

* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

*/

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

// TODO Auto-generated method stub

request.setCharacterEncoding("UTF-8");

response.setCharacterEncoding("UTF-8");

// 微信加密签名

String signature = request.getParameter("signature");

// 时间戮

String timestamp = request.getParameter("timestamp");

// 随机数

String nonce = request.getParameter("nonce");

// 随机字符串

String echostr = request.getParameter("echostr");

/** 读取接收到的xml消息 */

StringBuffer sb = new StringBuffer();

InputStream is = request.getInputStream();

InputStreamReader isr = new InputStreamReader(is, "UTF-8");

BufferedReader br = new BufferedReader(isr);

String s = "";

while ((s = br.readLine()) != null) {

sb.append(s);

}

String xml = sb.toString(); //次即为接收到微信端发送过来的xml数据

String result = "";

/** 判断是否是微信接入激活验证，只有首次接入验证时才会收到echostr参数，此时需要把它直接返回 */

if (SignUtil.checkSignature(signature, timestamp, nonce)) {

result = echostr;

} else {

//正常的微信处理流程

result = new WechatProcess().processWechatMag(xml);

}

try {

OutputStream os = response.getOutputStream();

os.write(result.getBytes("UTF-8"));

os.flush();

os.close();

} catch (Exception e) {

e.printStackTrace();

}

}

/**

* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

*/

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

// TODO 处理用户请求

}

}

验证帮助类

package com.weixin.common;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

import java.util.Arrays;

public class SignUtil {

/**

* 与接口配置信息中的 token 要一致，这里赋予什么值，在接口配置信息中的Token就要填写什么值，

* 两边保持一致即可

*/

private static String token = "weixintest";

/**

* 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 shal 加密

byte[] digest = md.digest(content.toString().getBytes());

tmpStr = byteToStr(digest);

} catch (NoSuchAlgorithmException e) {

// TODO Auto-generated catch block

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 digest

* @return

*/

private static String byteToStr(byte[] digest) {

// TODO Auto-generated method stub

String strDigest = "";

for(int i = 0; i < digest.length; i++){

strDigest += byteToHexStr(digest[i]);

}

return strDigest;

}

/**

* 将字节转换为十六进制字符串

* @param b

* @return

*/

private static String byteToHexStr(byte b) {

// TODO Auto-generated method stub

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[(b >>> 4) & 0X0F];

tempArr[1] = Digit[b & 0X0F];

String s = new String(tempArr);

return s;

}

}