基于Java语言MD5加密Base64转换方法

本文提供了基于MD5加密16位和32位的方法，具体内容如下

import java.io.IOException;import java.math.BigInteger;import java.security.MessageDigest;import java.security.NoSuchAlGorithmException;import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;public class EncodeUtil{  public static void main(String[] args) throws Exception  {    System.out.println(md5Encrypt16("需要进行MD5加密的字符串"));  }    public static String md5Encrypt16(String encryptStr)  {    return md5Encrypt32(encryptStr).substring(8, 24);  }    public static String md5Encrypt32(String encryptStr)  {    MessageDigest md5;    try    {      md5 = MessageDigest.getInstance("MD5");      byte[] md5Bytes = md5.digest(encryptStr.getBytes());      StringBuffer hexValue = new StringBuffer();      for (int i = 0; i < md5Bytes.length; i++)      {        int val = (md5Bytes[i]) & 0xff;        if (val < 16)        {          hexValue.append("0");        }        hexValue.append(Integer.toHexString(val));      }      return hexValue.toString().toLowerCase();    } catch (Exception e)    {      throw new RuntimeException(e);    }  }    public static String md5EncryptBase64(String msg) throws Exception  {    return msg == null ? null : base64Encode(md5(msg));  }    public static String binary(byte[] bytes, int radix)  {    return new BigInteger(1, bytes).toString(radix);// 这里的1代表正数   }    public static String base64Encode(byte[] bytes)  {    return new BASE64Encoder().encode(bytes);  }    public static byte[] base64Decode(String base64Code)  {    try    {      return base64Code == null ? null : new BASE64Decoder().decodeBuffer(base64Code);    } catch (IOException e)    {      throw new RuntimeException("报错内容", e);    }  }    public static byte[] md5(byte[] bytes)  {    MessageDigest md;    try    {      md = MessageDigest.getInstance("MD5");    } catch (NoSuchAlgorithmException e)    {      throw new RuntimeException("报错内容", e);    }    md.update(bytes);    return md.digest();  }    public static byte[] md5(String msg)  {    return msg == null ? null : md5(msg.getBytes());  }}