源码

/**
 * 类名：      MD5Digest<br>
 * 说明：   用来进行密码加密的md5公用参数<br>
 * 编写日期：  2001/03/05<br>
 * 修改者：    <br>
 * 修改信息：  <br>
 * @author     edgarlo edgarlo@china.com
 * @version    1.0<br>
 */
 
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5Digest
{

    private MessageDigest __md5 = null;
    private StringBuffer __digestBuffer = null;

    public MD5Digest()
        throws NoSuchAlgorithmException
    {
        __md5 = MessageDigest.getInstance("MD5");
        __digestBuffer = new StringBuffer();
    }

    public String md5crypt(String s)
    {
        __digestBuffer.setLength(0);
        byte abyte0[] = __md5.digest(s.getBytes());
        for(int i = 0; i < abyte0.length; i++)
            __digestBuffer.append(toHex(abyte0[i]));

        return __digestBuffer.toString();
    }
    public String toHex(byte one){
   String HEX="0123456789ABCDEF";
   char[] result=new char[2];
   result[0]=HEX.charAt((one & 0xf0) >> 4);
   result[1]=HEX.charAt(one & 0x0f);
   String mm=new String(result);
   return mm;
  }
}

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