import java.io.IOException;  import java.io.Serializable;  import java.security.InvalidKeyException;  import java.security.NoSuchAlgorithmException;    import javax.crypto.BadPaddingException;  import javax.crypto.Cipher;  import javax.crypto.IllegalBlockSizeException;  import javax.crypto.KeyGenerator;  import javax.crypto.NoSuchPaddingException;  import javax.crypto.SealedObject;  import javax.crypto.SecretKey;    public class EncryptDecryptObjectWithDES {        private static Cipher ecipher;      private static Cipher dcipher;        private static SecretKey key;        public static void main(String[] args) {            try {                // generate secret key using DES algorithm              key = KeyGenerator.getInstance("DES").generateKey();                ecipher = Cipher.getInstance("DES");              dcipher = Cipher.getInstance("DES");                // initialize the ciphers with the given key              ecipher.init(Cipher.ENCRYPT_MODE, key);              dcipher.init(Cipher.DECRYPT_MODE, key);                // create a sealed object              SealedObject sealed = new SealedObject(new SecretObject("My secret message"), ecipher);                // get the algorithm with the object has been sealed              String algorithm = sealed.getAlgorithm();              System.out.println("Algorithm " + algorithm);                // unseal (decrypt) the object              SecretObject o = (SecretObject) sealed.getObject(dcipher);                System.out.println("Original Object: " + o);            }          catch (NoSuchAlgorithmException e) {              System.out.println("No Such Algorithm:" + e.getMessage());              return;          }          catch (NoSuchPaddingException e) {              System.out.println("No Such Padding:" + e.getMessage());              return;          }          catch (BadPaddingException e) {              System.out.println("Bad Padding:" + e.getMessage());              return;          }          catch (InvalidKeyException e) {              System.out.println("Invalid Key:" + e.getMessage());              return;          }          catch (IllegalBlockSizeException e) {              System.out.println("Illegal Block:" + e.getMessage());              return;          }          catch (ClassNotFoundException e) {              System.out.println("Class Not Found:" + e.getMessage());              return;          }          catch (IOException e) {              System.out.println("I/O Error:" + e.getMessage());              return;          }        }        public static class SecretObject implements Serializable {            private static final long serialVersionUID = -1335351770906357695L;            private final String message;            public SecretObject(String message) {              this.message = message;          }            @Override          public String toString() {              return "SecretObject [message=" + message + "]";          }        }    }  

输出：

Algorithm DES  Original Object: SecretObject [message=My secret message]