Java 在servlet上发送编码参数时出现问题

我使用这个类进行编码/解码：

public class enc_dec {
public static Cipher dcipher, ecipher;

 public  enc_dec() {

          byte[] salt = { (byte) 0xA9, (byte) 0x9B, (byte) 0xC8, (byte) 0x32,
                       (byte) 0x56, (byte) 0x34, (byte) 0xE3, (byte) 0x03 };

          int iterationCount = 19;
try {
                 // Generate a temporary key. In practice, you would save this key
                 // Encrypting with DES Using a Pass Phrase
                 KeySpec keySpec = new PBEKeySpec("".toCharArray(), salt,iterationCount);
                 SecretKey key = SecretKeyFactory.getInstance("PBEWithMD5AndDES")
                              .generateSecret(keySpec);

                 ecipher = Cipher.getInstance(key.getAlgorithm());
                 dcipher = Cipher.getInstance(key.getAlgorithm());

                 // Prepare the parameters to the cipthers
                 AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt,
                              iterationCount);

                 ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
                 dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);

          } catch (Exception e) { }
    }

   // Encrpt Password
   @SuppressWarnings("unused")
   public String encrypt(String str) {
          try {
                 // Encode the string into bytes using utf-8
                 byte[] utf8 = str.getBytes("UTF8");
                 // Encrypt
                 byte[] enc = ecipher.doFinal(utf8);
                 // Encode bytes to base64 to get a string
                 return new sun.misc.BASE64Encoder().encode(enc);

          } catch (Exception e) {
          }
          return null;
   }

   // Decrpt password
   // To decrypt the encryted password
   public String decrypt(String str) {
          Cipher dcipher = null;
          try {
                 byte[] salt = { (byte) 0xA9, (byte) 0x9B, (byte) 0xC8, (byte) 0x32,
                              (byte) 0x56, (byte) 0x34, (byte) 0xE3, (byte) 0x03 };
                 int iterationCount = 19;
                 try {
                       String passPhrase = "";
                       KeySpec keySpec = new PBEKeySpec(passPhrase.toCharArray(),
                                     salt, iterationCount);
                       SecretKey key = SecretKeyFactory
                                     .getInstance("PBEWithMD5AndDES")
                                     .generateSecret(keySpec);
                       dcipher = Cipher.getInstance(key.getAlgorithm());
                       // Prepare the parameters to the cipthers
                       AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt,
                                     iterationCount);
                       dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
                 } catch (Exception e) {}


                 // Decode base64 to get bytes
                 byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(str);
                 // Decrypt
                 byte[] utf8 = dcipher.doFinal(dec);
                 // Decode using utf-8
                 return new String(utf8, "UTF8");
          } catch (Exception e) {
          }
          return null;
    }  

这是我从JSP页面发送的URL：

http://localhost:8080/Sample_Project/send_encode.ENC?type=M0z7jTCb8PPfSZxfAdhw3Q==&payment=UxCU5BdZh4U=&sr_no=eN1X3XOeYuI=

这是我的发送编码servlet：

 protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
         HttpSession session=request.getSession(false);
 if(session.getAttribute("session_set")!=null)
 {
 classes.enc_dec enc=new classes.enc_dec();
 response.setContentType("text/html;charset=UTF-8");
  PrintWriter out=response.getWriter();
  String type=enc.decrypt(request.getParameter("type"));
  String payment=enc.decrypt(request.getParameter("payment"));
  long sr_no=Long.parseLong(request.getParameter("sr_no"));
  try{
  RequestDispatcher comprd = getServletContext().getRequestDispatcher("/new_page.jsp?type="+enc.encrypt(type)+"&payment="+enc.encrypt(payment)+"");
  comprd.include(request, response);
  }
  catch(Exception e)
  {
      System.out.println("The ecxeption is "+e);
  }
  }

我面临的例外是：

WARNING:   StandardWrapperValve[send_encode]: Servlet.service() for servlet send_encode threw exception
java.lang.NumberFormatException: For input string: "eN1X3XOeYuI="
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Long.parseLong(Long.java:441)
at java.lang.Long.parseLong(Long.java:483)
at controller.send_encode.doGet(send_encode.java:30)

我已经将编码设置为UTF-8，但我仍然得到了例外。我还尝试了其他问题，但无法获得任何帮助。

---

提前感谢

堆栈跟踪显示异常是通过调用send_encode.doGet（）中的Long.parseLong（）引发的。您发布的代码没有此类说明。向我们展示真实、适当的代码。此外，请遵守Java命名约定。并且不要假设密码生成的字节是有效的UTFD8字符。他们不是。使用base-64或十六进制编码将字节数组转换为可打印字符。好的，谢谢您的帮助