md5和base64加密解密

import java.io.IOException;

import java.security.MessageDigest;

import sun.misc.BASE64Encoder;

import sun.misc.BASE64Decoder;

public class MD5Util {

    /**

     * MD5加密

     */

     public static String md5Encryption(String str)  {

          MessageDigest md5 = null;

          try {

           md5 = MessageDigest.getInstance("MD5");

          } catch (Exception e) {

           System.out.println(e.toString());

           e.printStackTrace();

           return "";

          }

          char[] charArray = str.toCharArray();

          byte[] byteArray = new byte[charArray.length];   

          for (int i = 0; i < charArray.length; i++)

           byteArray[i] = (byte) charArray[i];   

          byte[] md5Bytes = md5.digest(byteArray);   

          StringBuffer hexValue = new StringBuffer();   

          for (int i = 0; i < md5Bytes.length; i++) {

           int val = ((int) md5Bytes[i]) & 0xff;

           if (val < 16)

            hexValue.append("0");

           hexValue.append(Integer.toHexString(val));

          }   

          return hexValue.toString();

    }

     /**

      * base64加密

      */

     public static String base64Encryption(String str)  {

        if (str == null) return null;

        String encodeStr = "";

        try {

            BASE64Encoder b64Encoder = new BASE64Encoder();

            encodeStr = b64Encoder.encode(str.getBytes());

        } catch (Exception e) {

            e.printStackTrace();

        }

        return encodeStr;

    }

     /**

      * base64解密

      */

     public static String base64Dcrypt(String str)  {

        if (str == null) return null;

        String decoderStr = "";

        try {

            BASE64Decoder decoder = new BASE64Decoder();

            byte[] b = decoder.decodeBuffer(str);

            decoderStr = new String(b);

        } catch (IOException e) {

            e.printStackTrace();

            return null;

        }

        return decoderStr;

    }

}

md5和base64加密解密的相关教程结束。