用Java加密和解密字符串

    public String encrypt(String str) {        try { // Enpre the string into bytes using utf-8 byte[] utf8 = str.getBytes("UTF8"); // Encrypt byte[] enc = ecipher.doFinal(utf8); // Enpre bytes to base64 to get a string return new sun.misc.base64Enprer().enpre(enc);        } catch (javax.crypto.BadPaddingException e) {        } catch (IllegalBlockSizeException e) {        } catch (UnsupportedEncodingException e) {        } catch (java.io.IOException e) {        }        return null;    }    public String decrypt(String str) {        try { // Depre base64 to get bytes byte[] dec = new sun.misc.base64Deprer().depreBuffer(str); // Decrypt byte[] utf8 = dcipher.doFinal(dec); // Depre using utf-8 return new String(utf8, "UTF8");        } catch (javax.crypto.BadPaddingException e) {        } catch (IllegalBlockSizeException e) {        } catch (UnsupportedEncodingException e) {        } catch (java.io.IOException e) {        }        return null;    }}

这是使用该类的示例：

try {    // Generate a temporary key. In practice, you would save this key.    // See also Encrypting with DES Using a Pass Phrase.    SecretKey key = KeyGenerator.getInstance("DES").generateKey();    // Create encrypter/decrypter class    DesEncrypter encrypter = new DesEncrypter(key);    // Encrypt    String encrypted = encrypter.encrypt("Don't tell anybody!");    // Decrypt    String decrypted = encrypter.decrypt(encrypted);} catch (Exception e) {}