Des encryption and decryption algorithm implemented by Java

Package Encrypt;import java.security.*;  Import javax.crypto.*;       Import sun.misc.*;/** * Using DES encryption and decryption, the byte[],string type can be encrypted and decrypted * ciphertext can be stored using string,byte[]. * Method: * void GetKey (string strkey) generates a key from strkey Note * String getencstring (string strming) to encrypt strming , returns a string cipher * string getdesstring (string strmi) to decrypt the strmin, returning a string plaintext * byte[] Getenccode (byte[] byteS) byte[  ] Type of encryption * byte[] Getdescode (byte[] byted) byte[] Type decryption */public class encrypt{private key key;  Private byte[] Bytemi = null;  Private byte[] byteming = null;  Private String strmi= "";   Private String strm= ""; Generate key public void Setkey (String strkey) According to the parameters {try{Keygenerator _generator = Keygenerator.getinstance ("          DES ");          _generator.init (New SecureRandom (Strkey.getbytes ()));          This.key = _generator.generatekey ();        _generator=null;     } catch (Exception e) {e.printstacktrace (); }}//Encrypt string plaintext outputInput, string ciphertext output public void setencstring (string strming) {Base64encoder base64en = new Base64encoder ();        try {this.byteming = strming.getbytes ("UTF8");        This.bytemi = This.getenccode (this.byteming);     This.strmi = Base64en.encode (This.bytemi);     } catch (Exception e) {e.printstacktrace ();        } finally {this.byteming = null;      This.bytemi = null;      }}//Encrypt with byte[] plaintext input, byte[] ciphertext output private byte[] Getenccode (byte[] byteS) {byte[] Bytefina = null;      Cipher Cipher;        try {cipher = cipher.getinstance ("DES");        Cipher.init (Cipher.encrypt_mode,key);      Bytefina = Cipher.dofinal (ByteS);      } catch (Exception e) {e.printstacktrace ();     } finally {cipher = NULL;  } return Bytefina; }//decryption: Input in string cipher, string plaintext output public void setdesstring (string strmi) {Base64decoder base64de = new Base64decoder (       ); try {This.bytemi = Base64de.decodebuffer (strMi);        this.byteming = This.getdescode (Bytemi);        THIS.STRM = new String (byteming, "UTF8");      } catch (Exception e) {e.printstacktrace ();        } finally {base64de = null;        byteming = null;      Bytemi = null;      }}//Decrypt with byte[] ciphertext input, byte[] plaintext output private byte[] Getdescode (byte[] byted) {Cipher Cipher;      Byte[] Bytefina=null;        try{cipher = cipher.getinstance ("DES");        Cipher.init (Cipher.decrypt_mode,key);      Bytefina = Cipher.dofinal (byted);      } catch (Exception e) {e.printstacktrace ();      } finally {cipher=null;  } return Bytefina;  }//Returns encrypted ciphertext Strmi public String Getstrmi () {return strmi;  }//Returns the decrypted plaintext public String GETSTRM () {return strM;   } }