Java实现DES加密解密代码

好的，我可以为您提供Java实现DES加密解密代码。以下是示例代码：

import javax.crypto.*;
import javax.crypto.spec.*;
import java.security.*;

public class DesEncrypter {
   Cipher ecipher;
   Cipher dcipher;

   public DesEncrypter(SecretKey key) throws Exception {
      ecipher = Cipher.getInstance("DES");
      dcipher = Cipher.getInstance("DES");
      ecipher.init(Cipher.ENCRYPT_MODE, key);
      dcipher.init(Cipher.DECRYPT_MODE, key);
   }

   public byte[] encrypt(String str) throws Exception {
      // Convert the string to bytes using UTF-8 encoding
      byte[] utf8 = str.getBytes("UTF8");

      // Encrypt
      byte[] enc = ecipher.doFinal(utf8);

      return enc;
   }

   public String decrypt(byte[] enc) throws Exception {
      // Decrypt
      byte[] utf8 = dcipher.doFinal(enc);

      // Convert bytes to string using UTF-8 encoding
      String str = new String(utf8, "UTF8");

      return str;
   }

   public static void main(String[] args) throws Exception {
      // Generate a key
      KeyGenerator keygenerator = KeyGenerator.getInstance("DES");
      SecretKey myDesKey = keygenerator.generateKey();

      // Initialize the encrypter/decrypter
      DesEncrypter encrypter = new DesEncrypter(myDesKey);

      // Encrypt
      String encrypted = new String(encrypter.encrypt("Hello World"));

      // Decrypt
      String decrypted = encrypter.decrypt(encrypted.getBytes());

      System.out.println("Original String: " + "Hello World");
      System.out.println("Encrypted String: " + encrypted);
      System.out.println("Decrypted String: " + decrypted);
   }
}

请注意，此示例代码为简单示例，实际环境中可能需要更严格的安全性措施。