微信公众号开发java版-消息回复（普通文字消息和语音消息）

夏日清荷 發表於 2019-7-23 11:39:00

微信公众号开发java版-消息回复（普通文字消息和语音消息）

<pre>本文介绍微信公众号消息自动回复功能的开发，开发语言 java 话不多说，直接上代码 1.控制器代码</pre>
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<pre>package webapp.controller;

import org.springframework.context.annotation.Scope;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import webapp.ext.WechatSignUtil;
import webapp.ext.wechat.AuthProcess;
import webapp.ext.wechat.MessageUtil;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

@Scope("prototype")
@RestControllerpublic class NotifyController {

@RequestMapping(value = "notify",method = { RequestMethod.GET, RequestMethod.POST })
@ResponseBody
public String wechatNotify(HttpServletRequest request, HttpServletResponse response, String signature, String timestamp,
 String nonce, String echostr) throws IOException {

 boolean isGet = request.getMethod().toLowerCase().equals("get");
 if (isGet) {
 boolean isOk = WechatSignUtil.checkSignature(signature, timestamp, nonce);
 if (isOk)

 return echostr;
 else
 return null;
 } else {
 String resp = "";
 request.setCharacterEncoding("UTF-8");
 response.setCharacterEncoding("UTF-8");
 try {
 Map<String,String> map = MessageUtil.xmlToMap(request);
 String xml = "<xml><ToUserName>"+map.get("ToUserName")+"</ToUserName><Encrypt>" +map.get("Encrypt")+
 "</Encrypt></xml>";
 String result = AuthProcess.decryptMsg(request, xml);
 Map<String, Object> req = MessageUtil.xmlStr2Map(result);

 boolean hasEvent = req.containsKey("Event");

 String respXml = "";
 if (hasEvent) {
 String event = req.get("Event").toString();
 if ("subscribe".equals(event)) {
 //用户订阅公众号行为
 HashMap<String, Object> mapXml = new HashMap<>();
 mapXml.put("ToUserName",req.get("FromUserName"));
 mapXml.put("FromUserName",req.get("ToUserName"));
 mapXml.put("CreateTime",req.get("CreateTime"));
 mapXml.put("MsgType","text");
 mapXml.put("Content","感谢关注");
 respXml = MessageUtil.map2Xmlstring(mapXml);
 }
 } else {
 String msgType = req.get("MsgType").toString();
 String receive = "";
 if ("text".equals(msgType)){
 //普通文字消息
 receive = req.get("Content").toString();
 } else if ("voice".equals(msgType)){
 //语音消息
 //注意：这里Recognition拿到的直接就是语音消息转化之后的文字内容！！！直接用就好了
 receive = req.get("Recognition").toString();
 }
 respXml = sendMsg(req,receive);
 }

 resp = AuthProcess.encryptMsg(request, respXml.trim());
 return resp;
 } catch (Exception e) {
 e.printStackTrace();
 }
 return resp;
 }
}

private String sendMsg(Map<String, Object> req,String receive) {
 HashMap<String, Object> mapXml = new HashMap<>();

 mapXml.put("ToUserName",req.get("FromUserName"));
 mapXml.put("FromUserName",req.get("ToUserName"));
 mapXml.put("CreateTime",req.get("CreateTime"));
 mapXml.put("MsgType","text");
 //根据receive组装回复的内容
 mapXml.put("Content","回复的消息内容");
 return MessageUtil.map2Xmlstring(mapXml);
}
}</pre>
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2.杂七杂八的一些类，上面控制器用到的
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<pre>package webapp.ext.wechat;

@SuppressWarnings("serial")
public class AesException extends Exception {

public final static int OK = 0;
public final static int ValidateSignatureError = -40001;
public final static int ParseXmlError = -40002;
public final static int ComputeSignatureError = -40003;
public final static int IllegalAesKey = -40004;
public final static int ValidateAppidError = -40005;
public final static int EncryptAESError = -40006;
public final static int DecryptAESError = -40007;
public final static int IllegalBuffer = -40008;
//public final static int EncodeBase64Error = -40009;
//public final static int DecodeBase64Error = -40010;
//public final static int GenReturnXmlError = -40011;

private int code;

private static String getMessage(int code) {
 switch (code) {
 case ValidateSignatureError:
 return "签名验证错误";
 case ParseXmlError:
 return "xml解析失败";
 case ComputeSignatureError:
 return "sha加密生成签名失败";
 case IllegalAesKey:
 return "SymmetricKey非法";
 case ValidateAppidError:
 return "appid校验失败";
 case EncryptAESError:
 return "aes加密失败";
 case DecryptAESError:
 return "aes解密失败";
 case IllegalBuffer:
 return "解密后得到的buffer非法";
// case EncodeBase64Error:
// return "base64加密错误";
// case DecodeBase64Error:
// return "base64解密错误";
// case GenReturnXmlError:
// return "xml生成失败";
 default:
 return null; // cannot be
 }
}

public int getCode() {
 return code;
}

AesException(int code) {
 super(getMessage(code));
 this.code = code;
}

}</pre>
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<pre>package webapp.ext.wechat;

import javax.servlet.http.HttpServletRequest;

public class AuthProcess {
/**
* 将加密后的原文进行解密重新封装
* @param request
* @param originalXml 原xml
* @return 重新解密后的xml
*/
public static StringdecryptMsg(HttpServletRequest request,String originalXml) {
 // 微信加密签名
 //String sVerifyMsgSig = request.getParameter("signature");
 String msgSignature = request.getParameter("msg_signature");
 // 时间戳
 String timestamp = request.getParameter("timestamp");
 // 随机数
 String nonce = request.getParameter("nonce");
 try {
 WXBizMsgCrypt pc = new WXBizMsgCrypt("your token", "your EncodingAESKey", "your appid");
 return pc.decryptMsg(msgSignature, timestamp, nonce, originalXml);
 } catch (AesException e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
 }
 return null;
}

/**
* 对需要回复的原文进行加密重新封装
* @param request
* @param replyXml 需要回复的xml
* @return 重新加密后的xml
*/
public static StringencryptMsg(HttpServletRequest request, String replyXml) {
 // 时间戳
 String timestamp = request.getParameter("timestamp");
 // 随机数
 String nonce = request.getParameter("nonce");
 try {
 WXBizMsgCrypt pc = new WXBizMsgCrypt("your token", "your EncodingAESKey", "your appid");
 return pc.encryptMsg(replyXml, timestamp, nonce);
 } catch (AesException e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
 }
 return null;
}

}</pre>
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<pre>package webapp.ext.wechat;

import java.util.ArrayList;

class ByteGroup {
ArrayList<Byte> byteContainer = new ArrayList<Byte>();

public byte[] toBytes() {
 byte[] bytes = new byte;
 for (int i = 0; i < byteContainer.size(); i++) {
 bytes = byteContainer.get(i);
 }
 return bytes;
}

public ByteGroup addBytes(byte[] bytes) {
 for (byte b : bytes) {
 byteContainer.add(b);
 }
 return this;
}

public int size() {
 return byteContainer.size();
}
}</pre>
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<pre>package webapp.ext.wechat;

import com.thoughtworks.xstream.XStream;
import org.apache.http.util.TextUtils;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.io.InputStream;
import java.util.*;

public class MessageUtil {

public static final String MESSAGE_TEXT = "text";
public static final String MESSAGE_IMAGE = "image";
public static final String MESSAGE_VOICE = "voice";
public static final String MESSAGE_VIDEO = "video";
public static final String MESSAGE_LINK = "link";
public static final String MESSAGE_LOCATION = "location";
public static final String MESSAGE_EVENT = "event";

public static final String EVENT_SUB = "subscribe";
public static final String EVENT_UNSUB = "unsubscribe";
public static final String EVENT_CLICK = "CLICK";
public static final String EVENT_VIEW = "VIEW";

/**
* xml转为map
* @param request
* @return
* @throws DocumentException
* @throws IOException
*/
public static Map<String, String> xmlToMap(HttpServletRequest request ) throws DocumentException, IOException
{
 Map<String,String> map = new HashMap<String, String>();

 SAXReader reader = new SAXReader();

 InputStream ins = request.getInputStream();
 Document doc = reader.read(ins);

 Element root = doc.getRootElement();
 List<Element> list = root.elements();
 for (Element e : list) {
 map.put(e.getName(), e.getText());
 }
 ins.close();
 return map;
}

public static String textMessageToXml(TextMessage textMessage){
 XStream xstream = new XStream();
 xstream.alias("xml", textMessage.getClass());
 return xstream.toXML(textMessage);

}

public static Map<String,Object> xmlStr2Map(String xmlStr){
 Map<String,Object> map = new HashMap<String,Object>();
 Document doc;
 try {
 doc = DocumentHelper.parseText(xmlStr);
 Element root = doc.getRootElement();
 List children = root.elements();
 if(children != null && children.size() > 0) {
 for(int i = 0; i < children.size(); i++) {
 Element child = (Element)children.get(i);
 map.put(child.getName(), child.getTextTrim());
 }
 }
 } catch (DocumentException e) {
 e.printStackTrace();
 }
 return map;
}

public static String map2Xmlstring(Map<String,Object> map){
 StringBuffer sb = new StringBuffer("");
 sb.append("<xml>");

 Set<String> set = map.keySet();
 for(Iterator<String> it = set.iterator(); it.hasNext();){
 String key = it.next();
 Object value = map.get(key);
 sb.append("<").append(key).append(">");
 sb.append(value);
 sb.append("</").append(key).append(">");
 }
 sb.append("</xml>");
 return sb.toString();
}

public static String map2XmlstringWithHead(Map<String,Object> map,String head){
 StringBuffer sb = new StringBuffer("");

 if (!TextUtils.isEmpty(head)) {
 sb.append("<"+head+">");
 }
 Set<String> set = map.keySet();
 for(Iterator<String> it = set.iterator(); it.hasNext();){
 String key = it.next();
 Object value = map.get(key);
 sb.append("<").append(key).append(">");
 sb.append(value);
 sb.append("</").append(key).append(">");
 }
 if (!TextUtils.isEmpty(head)) {
 sb.append("</"+head+">");
 }
 return sb.toString();
}

}</pre>
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<pre>/**
* 对公众平台发送给公众账号的消息加解密示例代码.
*
* @copyright Copyright (c) 1998-2014 Tencent Inc.
*/

// ------------------------------------------------------------------------

package webapp.ext.wechat;

import java.nio.charset.Charset;
import java.util.Arrays;

/**
* 提供基于PKCS7算法的加解密接口.
*/
class PKCS7Encoder {
static Charset CHARSET = Charset.forName("utf-8");
static int BLOCK_SIZE = 32;

/**
* 获得对明文进行补位填充的字节.
*
* @param count 需要进行填充补位操作的明文字节个数
* @return 补齐用的字节数组
*/
static byte[] encode(int count) {
 // 计算需要填充的位数
 int amountToPad = BLOCK_SIZE - (count % BLOCK_SIZE);
 if (amountToPad == 0) {
 amountToPad = BLOCK_SIZE;
 }
 // 获得补位所用的字符
 char padChr = chr(amountToPad);
 String tmp = new String();
 for (int index = 0; index < amountToPad; index++) {
 tmp += padChr;
 }
 return tmp.getBytes(CHARSET);
}

/**
* 删除解密后明文的补位字符
*
* @param decrypted 解密后的明文
* @return 删除补位字符后的明文
*/
static byte[] decode(byte[] decrypted) {
 int pad = (int) decrypted;
 if (pad < 1 || pad > 32) {
 pad = 0;
 }
 return Arrays.copyOfRange(decrypted, 0, decrypted.length - pad);
}

/**
* 将数字转化成ASCII码对应的字符，用于对明文进行补码
*
* @param a 需要转化的数字
* @return 转化得到的字符
*/
static char chr(int a) {
 byte target = (byte) (a & 0xFF);
 return (char) target;
}

}</pre>
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<pre>/**
* 对公众平台发送给公众账号的消息加解密示例代码.
*
* @copyright Copyright (c) 1998-2014 Tencent Inc.
*/

// ------------------------------------------------------------------------

package webapp.ext.wechat;

import java.security.MessageDigest;
import java.util.Arrays;

/**
* SHA1 class
*
* 计算公众平台的消息签名接口.
*/
class SHA1 {

/**
* 用SHA1算法生成安全签名
* @param token 票据
* @param timestamp 时间戳
* @param nonce 随机字符串
* @param encrypt 密文
* @return 安全签名
* @throws com.qq.weixin.mp.aes.AesException
*/
public static String getSHA1(String token, String timestamp, String nonce, String encrypt) throws AesException
 {
 try {
 String[] array = new String[] { token, timestamp, nonce, encrypt };
 StringBuffer sb = new StringBuffer();
 // 字符串排序
 Arrays.sort(array);
 for (int i = 0; i < 4; i++) {
 sb.append(array);
 }
 String str = sb.toString();
 // SHA1签名生成
 MessageDigest md = MessageDigest.getInstance("SHA-1");
 md.update(str.getBytes());
 byte[] digest = md.digest();

 StringBuffer hexstr = new StringBuffer();
 String shaHex = "";
 for (int i = 0; i < digest.length; i++) {
 shaHex = Integer.toHexString(digest & 0xFF);
 if (shaHex.length() < 2) {
 hexstr.append(0);
 }
 hexstr.append(shaHex);
 }
 return hexstr.toString();
 } catch (Exception e) {
 e.printStackTrace();
 throw new AesException(AesException.ComputeSignatureError);
 }
}
}</pre>
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<pre>package webapp.ext.wechat;

public class TextMessage {

public String ToUserName;
public String FromUserName;
public int CreateTime;
public String MsgType;
public String Content;

public String getToUserName() {
 return ToUserName;
}

public void setToUserName(String toUserName) {
 ToUserName = toUserName;
}

public String getFromUserName() {
 return FromUserName;
}

public void setFromUserName(String fromUserName) {
 FromUserName = fromUserName;
}

public int getCreateTime() {
 return CreateTime;
}

public void setCreateTime(int createTime) {
 CreateTime = createTime;
}

public String getMsgType() {
 return MsgType;
}

public void setMsgType(String msgType) {
 MsgType = msgType;
}

public String getContent() {
 return Content;
}

public void setContent(String content) {
 Content = content;
}
}</pre>
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<pre>/**
* 对公众平台发送给公众账号的消息加解密示例代码.
*
* @copyright Copyright (c) 1998-2014 Tencent Inc.
*/

// ------------------------------------------------------------------------

/**
* 针对org.apache.commons.codec.binary.Base64，
* 需要导入架包commons-codec-1.9（或commons-codec-1.8等其他版本）
* 官方下载地址：http://commons.apache.org/proper/commons-codec/download_codec.cgi
*/
package webapp.ext.wechat;

import org.apache.commons.codec.binary.Base64;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.Charset;
import java.util.Arrays;
import java.util.Random;

/**
* 提供接收和推送给公众平台消息的加解密接口(UTF8编码的字符串).
* <ol>
* <li>第三方回复加密消息给公众平台</li>
* <li>第三方收到公众平台发送的消息，验证消息的安全性，并对消息进行解密。</li>
* </ol>
* 说明：异常java.security.InvalidKeyException:illegal Key Size的解决方案
* <ol>
* <li>在官方网站下载JCE无限制权限策略文件（JDK7的下载地址：
* http://www.oracle.com/technetwork/java/javase/downloads/jce-7-download-432124.html</li>
* <li>下载后解压，可以看到local_policy.jar和US_export_policy.jar以及readme.txt</li>
* <li>如果安装了JRE，将两个jar文件放到%JRE_HOME%\lib\security目录下覆盖原来的文件</li>
* <li>如果安装了JDK，将两个jar文件放到%JDK_HOME%\jre\lib\security目录下覆盖原来文件</li>
* </ol>
*/
public class WXBizMsgCrypt {
static Charset CHARSET = Charset.forName("utf-8");
Base64 base64 = new Base64();
byte[] aesKey;
String token;
String appId;

/**
* 构造函数
* @param token 公众平台上，开发者设置的token
* @param encodingAesKey 公众平台上，开发者设置的EncodingAESKey
* @param appId 公众平台appid
*
* @throws AesException 执行失败，请查看该异常的错误码和具体的错误信息
*/
public WXBizMsgCrypt(String token, String encodingAesKey, String appId) throws AesException {
 if (encodingAesKey.length() != 43) {
 throw new AesException(AesException.IllegalAesKey);
 }

 this.token = token;
 this.appId = appId;
 aesKey = Base64.decodeBase64(encodingAesKey + "=");
}

// 生成4个字节的网络字节序
byte[] getNetworkBytesOrder(int sourceNumber) {
 byte[] orderBytes = new byte;
 orderBytes[3] = (byte) (sourceNumber & 0xFF);
 orderBytes[2] = (byte) (sourceNumber >> 8 & 0xFF);
 orderBytes[1] = (byte) (sourceNumber >> 16 & 0xFF);
 orderBytes[0] = (byte) (sourceNumber >> 24 & 0xFF);
 return orderBytes;
}

// 还原4个字节的网络字节序
int recoverNetworkBytesOrder(byte[] orderBytes) {
 int sourceNumber = 0;
 for (int i = 0; i < 4; i++) {
 sourceNumber <<= 8;
 sourceNumber |= orderBytes & 0xff;
 }
 return sourceNumber;
}

// 随机生成16位字符串
 String getRandomStr() {
 String base = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
 Random random = new Random();
 StringBuffer sb = new StringBuffer();
 for (int i = 0; i < 16; i++) {
 int number = random.nextInt(base.length());
 sb.append(base.charAt(number));
 }
 return sb.toString();
}

/**
* 对明文进行加密.
*
* @param text 需要加密的明文
* @return 加密后base64编码的字符串
* @throws AesException aes加密失败
*/
String encrypt(String randomStr, String text) throws AesException {
 ByteGroup byteCollector = new ByteGroup();
 byte[] randomStrBytes = randomStr.getBytes(CHARSET);
 byte[] textBytes = text.getBytes(CHARSET);
 byte[] networkBytesOrder = getNetworkBytesOrder(textBytes.length);
 byte[] appidBytes = appId.getBytes(CHARSET);

 // randomStr + networkBytesOrder + text + appid
 byteCollector.addBytes(randomStrBytes);
 byteCollector.addBytes(networkBytesOrder);
 byteCollector.addBytes(textBytes);
 byteCollector.addBytes(appidBytes);

 // ... + pad: 使用自定义的填充方式对明文进行补位填充
 byte[] padBytes = PKCS7Encoder.encode(byteCollector.size());
 byteCollector.addBytes(padBytes);

 // 获得最终的字节流, 未加密
 byte[] unencrypted = byteCollector.toBytes();

 try {
 // 设置加密模式为AES的CBC模式
 Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
 SecretKeySpec keySpec = new SecretKeySpec(aesKey, "AES");
 IvParameterSpec iv = new IvParameterSpec(aesKey, 0, 16);
 cipher.init(Cipher.ENCRYPT_MODE, keySpec, iv);

 // 加密
 byte[] encrypted = cipher.doFinal(unencrypted);

 // 使用BASE64对加密后的字符串进行编码
 String base64Encrypted = base64.encodeToString(encrypted);

 return base64Encrypted;
 } catch (Exception e) {
 e.printStackTrace();
 throw new AesException(AesException.EncryptAESError);
 }
}

/**
* 对密文进行解密.
*
* @param text 需要解密的密文
* @return 解密得到的明文
* @throws AesException aes解密失败
*/
String decrypt(String text) throws AesException {
 byte[] original;
 try {
 // 设置解密模式为AES的CBC模式
 Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
 SecretKeySpec key_spec = new SecretKeySpec(aesKey, "AES");
 IvParameterSpec iv = new IvParameterSpec(Arrays.copyOfRange(aesKey, 0, 16));
 cipher.init(Cipher.DECRYPT_MODE, key_spec, iv);

 // 使用BASE64对密文进行解码
 byte[] encrypted = Base64.decodeBase64(text);

 // 解密
 original = cipher.doFinal(encrypted);
 } catch (Exception e) {
 e.printStackTrace();
 throw new AesException(AesException.DecryptAESError);
 }

 String xmlContent, from_appid;
 try {
 // 去除补位字符
 byte[] bytes = PKCS7Encoder.decode(original);

 // 分离16位随机字符串,网络字节序和AppId
 byte[] networkOrder = Arrays.copyOfRange(bytes, 16, 20);

 int xmlLength = recoverNetworkBytesOrder(networkOrder);

 xmlContent = new String(Arrays.copyOfRange(bytes, 20, 20 + xmlLength), CHARSET);
 from_appid = new String(Arrays.copyOfRange(bytes, 20 + xmlLength, bytes.length),
 CHARSET);
 } catch (Exception e) {
 e.printStackTrace();
 throw new AesException(AesException.IllegalBuffer);
 }

 // appid不相同的情况
 if (!from_appid.equals(appId)) {
 throw new AesException(AesException.ValidateAppidError);
 }
 return xmlContent;

}

/**
* 将公众平台回复用户的消息加密打包.
* <ol>
* <li>对要发送的消息进行AES-CBC加密</li>
* <li>生成安全签名</li>
* <li>将消息密文和安全签名打包成xml格式</li>
* </ol>
*
* @param replyMsg 公众平台待回复用户的消息，xml格式的字符串
* @param timeStamp 时间戳，可以自己生成，也可以用URL参数的timestamp
* @param nonce 随机串，可以自己生成，也可以用URL参数的nonce
*
* @return 加密后的可以直接回复用户的密文，包括msg_signature, timestamp, nonce, encrypt的xml格式的字符串
* @throws AesException 执行失败，请查看该异常的错误码和具体的错误信息
*/
public String encryptMsg(String replyMsg, String timeStamp, String nonce) throws AesException {
 // 加密
 String encrypt = encrypt(getRandomStr(), replyMsg);

 // 生成安全签名
 if (timeStamp == "") {
 timeStamp = Long.toString(System.currentTimeMillis());
 }

 String signature = SHA1.getSHA1(token, timeStamp, nonce, encrypt);

 // System.out.println("发送给平台的签名是: " + signature.toString());
 // 生成发送的xml
 String result = XMLParse.generate(encrypt, signature, timeStamp, nonce);
 return result;
}

/**
* 检验消息的真实性，并且获取解密后的明文.
* <ol>
* <li>利用收到的密文生成安全签名，进行签名验证</li>
* <li>若验证通过，则提取xml中的加密消息</li>
* <li>对消息进行解密</li>
* </ol>
*
* @param msgSignature 签名串，对应URL参数的msg_signature
* @param timeStamp 时间戳，对应URL参数的timestamp
* @param nonce 随机串，对应URL参数的nonce
* @param postData 密文，对应POST请求的数据
*
* @return 解密后的原文
* @throws AesException 执行失败，请查看该异常的错误码和具体的错误信息
*/
public String decryptMsg(String msgSignature, String timeStamp, String nonce, String postData)
 throws AesException {

 // 密钥，公众账号的app secret
 // 提取密文
 Object[] encrypt = XMLParse.extract(postData);

 // 验证安全签名
 String signature = SHA1.getSHA1(token, timeStamp, nonce, encrypt.toString());

 // 和URL中的签名比较是否相等
 // System.out.println("第三方收到URL中的签名：" + msg_sign);
 // System.out.println("第三方校验签名：" + signature);
 if (!signature.equals(msgSignature)) {
 throw new AesException(AesException.ValidateSignatureError);
 }

 // 解密
 String result = decrypt(encrypt.toString());
 return result;
}

/**
* 验证URL
* @param msgSignature 签名串，对应URL参数的msg_signature
* @param timeStamp 时间戳，对应URL参数的timestamp
* @param nonce 随机串，对应URL参数的nonce
* @param echoStr 随机串，对应URL参数的echostr
*
* @return 解密之后的echostr
* @throws AesException 执行失败，请查看该异常的错误码和具体的错误信息
*/
public String verifyUrl(String msgSignature, String timeStamp, String nonce, String echoStr)
 throws AesException {
 String signature = SHA1.getSHA1(token, timeStamp, nonce, echoStr);

 if (!signature.equals(msgSignature)) {
 throw new AesException(AesException.ValidateSignatureError);
 }

 String result = decrypt(echoStr);
 return result;
}

}</pre>
</div>
View Code</div>
<div class="cnblogs_code"><img id="code_img_closed_ebab45dc-c785-4c61-b152-40c87713fa49" class="code_img_closed" src="https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif" alt=""><img id="code_img_opened_ebab45dc-c785-4c61-b152-40c87713fa49" class="code_img_opened" style="display: none" src="https://images.cnblogs.com/OutliningIndicators/ExpandedBlockStart.gif" alt="">
<div id="cnblogs_code_open_ebab45dc-c785-4c61-b152-40c87713fa49" class="cnblogs_code_hide">
<pre>/**
* 对公众平台发送给公众账号的消息加解密示例代码.
*
* @copyright Copyright (c) 1998-2014 Tencent Inc.
*/

// ------------------------------------------------------------------------

package webapp.ext.wechat;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import java.io.StringReader;

/**
* XMLParse class
*
* 提供提取消息格式中的密文及生成回复消息格式的接口.
*/
class XMLParse {

/**
* 提取出xml数据包中的加密消息
* @param xmltext 待提取的xml字符串
* @return 提取出的加密消息字符串
* @throws com.qq.weixin.mp.aes.AesException
*/
public static Object[] extract(String xmltext) throws AesException {
 Object[] result = new Object;
 try {
 DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
 dbf.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
 dbf.setFeature("http://xml.org/sax/features/external-general-entities", false);
 dbf.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
 dbf.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
 dbf.setXIncludeAware(false);
 dbf.setExpandEntityReferences(false);
 DocumentBuilder db = dbf.newDocumentBuilder();
 StringReader sr = new StringReader(xmltext);
 InputSource is = new InputSource(sr);
 Document document = db.parse(is);

 Element root = document.getDocumentElement();
 NodeList nodelist1 = root.getElementsByTagName("Encrypt");
 NodeList nodelist2 = root.getElementsByTagName("ToUserName");
 result[0] = 0;
 result[1] = nodelist1.item(0).getTextContent();
 result[2] = nodelist2.item(0).getTextContent();
 return result;
 } catch (Exception e) {
 e.printStackTrace();
 throw new AesException(AesException.ParseXmlError);
 }
}

/**
* 生成xml消息
* @param encrypt 加密后的消息密文
* @param signature 安全签名
* @param timestamp 时间戳
* @param nonce 随机字符串
* @return 生成的xml字符串
*/
public static String generate(String encrypt, String signature, String timestamp, String nonce) {

 String format = "<xml>\n" + "<Encrypt><!]></Encrypt>\n"
 + "<MsgSignature><!]></MsgSignature>\n"
 + "<TimeStamp>%3$s</TimeStamp>\n" + "<Nonce><!]></Nonce>\n" + "</xml>";
 return String.format(format, encrypt, signature, timestamp, nonce);

}
}</pre>
</div>
View Code</div>
<div class="cnblogs_code"><img id="code_img_closed_35562cb7-42e5-494d-bb7a-bcb54bacf450" class="code_img_closed" src="https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif" alt=""><img id="code_img_opened_35562cb7-42e5-494d-bb7a-bcb54bacf450" class="code_img_opened" style="display: none" src="https://images.cnblogs.com/OutliningIndicators/ExpandedBlockStart.gif" alt="">
<div id="cnblogs_code_open_35562cb7-42e5-494d-bb7a-bcb54bacf450" class="cnblogs_code_hide">
<pre>package webapp.ext;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;

/**
* @Author:Fei.chu
* @Date:Created in 21:52 2018/08/17
* @Description:微信签名校验
*/
public class WechatSignUtil {

/**
* 校验签名
* @param signature 微信加密签名.
* @param timestamp 时间戳.
* @param nonce 随机数.
* @return
*/
public static boolean checkSignature(String signature, String timestamp, String nonce) {
 // 对token、timestamp、和nonce按字典排序.
 String[] paramArr = new String[] {"your token", timestamp, nonce};
 Arrays.sort(paramArr);

 // 将排序后的结果拼接成一个字符串.
 String content= paramArr.concat(paramArr).concat(paramArr);

 String ciphertext = null;
 try {
 MessageDigest md = MessageDigest.getInstance("SHA-1");
 // 对拼接后的字符串进行sha1加密.
 byte[] digest = md.digest(content.toString().getBytes());
 ciphertext = byteToStr(digest);
 } catch (NoSuchAlgorithmException e) {
 e.printStackTrace();
 }

 // 将sha1加密后的字符串与signature进行对比.
 return ciphertext != null ? ciphertext.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);
 }
 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;
 tempArr[0] = Digit[(mByte >>> 4) & 0X0F];
 tempArr[1] = Digit;

 String s = new String(tempArr);
 return s;
}

// //获取token
// public static String getToken() throws Exception{
// String token = DbGhostApi.tokenIsValid();
// if (token != null) {
// return token;
// } else {
// Date now = new Date();
// String rsp = HttpUtil.getString("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + Config.appid + "&secret=" + Config.secret);
// JSONObject obj = JSONObject.parseObject(rsp);
// String access_token = obj.getString("access_token");
// int expires_in = obj.getIntValue("expires_in");
// DbGhostApi.updateToken(access_token, DateUtil.dateAddSecond(now,expires_in));
// return access_token;
// }
// }
}</pre>
</div>
View Code</div>
 
注意：语音消息识别需要在公众号后台开启相应功能
<img src="https://img2018.cnblogs.com/blog/1221763/201907/1221763-20190723132306040-1738972109.png" alt="" width="1183" height="483"> 
来源：https://www.cnblogs.com/vicF/p/11230837.html

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微信公众号开发java版-消息回复（普通文字消息和语音消息）