Java项目中用到的md5加密

Java项目中字符串加密技术源码：

import java.security.MessageDigest;

public class MD5 {
    private static final String[] hexDigits = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d",
            "e", "f" };

public static String byteArrayToHexString(byte[] b) {
        StringBuffer resultSb = new StringBuffer();
        for (int i = 0; i < b.length; ++i)
            resultSb.append(byteToHexString(b[i]));

return resultSb.toString();
    }

private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0)
            n += 256;
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }

public static String MD5Encode(String origin) {

String resultString = null;
        try {
            resultString = new String(origin);
            MessageDigest md = MessageDigest.getInstance("MD5");
            resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
        }
        catch (java.lang.Exception md) {
        }
        return resultString + resultString.substring(0, 3).toLowerCase();
    }

public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.print(MD5Encode("1"));
    }
}