public class CoreServlet1 extends HttpServlet {
 private static final long serialVersionUID = 4440739483644821986L;
 String sToken = "weixinCourse";
 String sCorpID = "wxe510946434680dab";
 String sEncodingAESKey = "DjlyZxgKiWRESIW2VnV9dSr7HsS7usWDfnwA8Q1ove1";
 
 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 
  WXBizMsgCrypt wxcpt;
 
   try {
 wxcpt = new WXBizMsgCrypt(sToken, sEncodingAESKey, sCorpID); 
 
 String sVerifyMsgSig = request.getParameter("msg_signature");
 
 String sVerifyTimeStamp = request.getParameter("timestamp"); 
 
 String sVerifyNonce = request.getParameter("nonce"); 
 
 String sVerifyEchoStr = request.getParameter("echostr");  
 String sEchoStr;
 
 sEchoStr = wxcpt.VerifyURL(sVerifyMsgSig, sVerifyTimeStamp,
   sVerifyNonce, sVerifyEchoStr);
 System.out.println("verifyurl echostr: " + sEchoStr);
 PrintWriter out = response.getWriter();
 out.print(sEchoStr); 
 out.close();
 out = null;
 
 } catch (AesException e1) {
 
 e1.printStackTrace();
 }
 
  }
}

 /**
 * 對公眾平臺發(fā)送給公眾賬號的消息加解密示例代碼.
 * 
 * @copyright Copyright (c) 1998-2014 Tencent Inc.
 */

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

/**
 * 針對org.apache.commons.codec.binary.Base64，
 * 需要導(dǎo)入架包commons-codec-1.9（或commons-codec-1.8等其他版本）
 * 官方下載地址：http://commons.apache.org/proper/commons-codec/download_codec.cgi
 */
package com.qq.weixin.mp.aes;

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

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

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

/**
 * 提供接收和推送給公眾平臺消息的加解密接口(UTF8編碼的字符串).
 * <ol>
 * <li>第三方回復(fù)加密消息給公眾平臺</li>
 * <li>第三方收到公眾平臺發(fā)送的消息，驗證消息的安全性，并對消息進(jìn)行解密。</li>
 * </ol>
 * 說明：異常java.security.InvalidKeyException:illegal Key Size的解決方案
 * <ol>
 * <li>在官方網(wǎng)站下載JCE無限制權(quán)限策略文件（JDK7的下載地址：
 *   http://www.oracle.com/technetwork/java/javase/downloads/jce-7-download-432124.html</li>
 * <li>下載后解壓，可以看到local_policy.jar和US_export_policy.jar以及readme.txt</li>
 * <li>如果安裝了JRE，將兩個jar文件放到%JRE_HOME%\lib\security目錄下覆蓋原來的文件</li>
 * <li>如果安裝了JDK，將兩個jar文件放到%JDK_HOME%\jre\lib\security目錄下覆蓋原來文件</li>
 * </ol>
 */
public class WXBizMsgCrypt {
 static Charset CHARSET = Charset.forName("utf-8");
 Base64 base64 = new Base64();
 byte[] aesKey;
 String token;
 String corpId;

 /**
 * 構(gòu)造函數(shù)
 * @param token 公眾平臺上，開發(fā)者設(shè)置的token
 * @param encodingAesKey 公眾平臺上，開發(fā)者設(shè)置的EncodingAESKey
 * @param corpId 企業(yè)的corpid
 * 
 * @throws AesException 執(zhí)行失敗，請查看該異常的錯誤碼和具體的錯誤信息
 */
 public WXBizMsgCrypt(String token, String encodingAesKey, String corpId) throws AesException {
 if (encodingAesKey.length() != 43) {
  throw new AesException(AesException.IllegalAesKey);
 }

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

 
 

 /**
 * 對密文進(jìn)行解密.
 * 
 * @param text 需要解密的密文
 * @return 解密得到的明文
 * @throws AesException aes解密失敗
 */
 String decrypt(String text) throws AesException {
 byte[] original;
 try {
  // 設(shè)置解密模式為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對密文進(jìn)行解碼
  byte[] encrypted = Base64.decodeBase64(text);

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

 String xmlContent, from_corpid;
 try {
  // 去除補(bǔ)位字符
  byte[] bytes = PKCS7Encoder.decode(original);

  // 分離16位隨機(jī)字符串,網(wǎng)絡(luò)字節(jié)序和corpId
  byte[] networkOrder = Arrays.copyOfRange(bytes, 16, 20);

  int xmlLength = recoverNetworkBytesOrder(networkOrder);

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

 // corpid不相同的情況
 if (!from_corpid.equals(corpId)) {
  throw new AesException(AesException.ValidateCorpidError);
 }
 return xmlContent;

 }


 /**
 * 驗證URL
 * @param msgSignature 簽名串，對應(yīng)URL參數(shù)的msg_signature
 * @param timeStamp 時間戳，對應(yīng)URL參數(shù)的timestamp
 * @param nonce 隨機(jī)串，對應(yīng)URL參數(shù)的nonce
 * @param echoStr 隨機(jī)串，對應(yīng)URL參數(shù)的echostr
 * 
 * @return 解密之后的echostr
 * @throws AesException 執(zhí)行失敗，請查看該異常的錯誤碼和具體的錯誤信息
 */
 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;
 }

}
 /**
 * 對公眾平臺發(fā)送給公眾賬號的消息加解密示例代碼.
 * 
 * @copyright Copyright (c) 1998-2014 Tencent Inc.
 */

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

package com.qq.weixin.mp.aes;

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

/**
 * SHA1 class
 *
 * 計算公眾平臺的消息簽名接口.
 */
class SHA1 {

 /**
 * 用SHA1算法生成安全簽名
 * @param token 票據(jù)
 * @param timestamp 時間戳
 * @param nonce 隨機(jī)字符串
 * @param encrypt 密文
 * @return 安全簽名
 * @throws 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[i]);
  }
  String str = sb.toString();
  // SHA1簽名生成
  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[i] & 0xFF);
  if (shaHex.length() < 2) {
   hexstr.append(0);
  }
  hexstr.append(shaHex);
  }
  return hexstr.toString();
 } catch (Exception e) {
  e.printStackTrace();
  throw new AesException(AesException.ComputeSignatureError);
 }
 }
}

 class PKCS7Encoder {
 static Charset CHARSET = Charset.forName("utf-8");
 static int BLOCK_SIZE = 32;
/**
 * 刪除解密后明文的補(bǔ)位字符
 * 
 * @param decrypted 解密后的明文
 * @return 刪除補(bǔ)位字符后的明文
 */
 static byte[] decode(byte[] decrypted) {
 int pad = (int) decrypted[decrypted.length - 1];
 if (pad < 1 || pad > 32) {
  pad = 0;
 }
 return Arrays.copyOfRange(decrypted, 0, decrypted.length - pad);
 }
}