keygentools.java

羽量级数据持久层开发框架

package org.speedframework.utilities;

//~--- non-JDK imports --------------------------------------------------------

import org.speedframework.exception.SpeedFrameworkException;

//~--- JDK imports ------------------------------------------------------------

import java.security.MessageDigest;

/**
 * create the unique id of sql bean
 *
 * @author victorching
 */
public class KeyGenTools
 {

    /** 属性描述信息 */
    private final static String[] hexDigits = {
        "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"
    };

    /**
     * @param b byte[]00
     * @return String
     */
    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();
    }

    /**
     * do something
     *
     * @param b byte
     * @return String
     */
    private static String byteToHexString(byte b) {
        int n = b;

        if (n < 0) {
            n = 256 + n;
        }

        int d1 = n / 16;
        int d2 = n % 16;

        return hexDigits[d1] + hexDigits[d2];
    }

    /**
     * 方法描述信息，
     * 描述方法是做什么的，
     * 如何调用，最好给出调用代码示例。
     *
     * @param origin
     *
     * @return
     *
     * @throws SpeedFrameworkException
     */
    public static String MD5Encode(String origin) throws SpeedFrameworkException {
        String resultString = null;

        try {
            resultString = new String(origin);

            MessageDigest md = MessageDigest.getInstance("MD5");

            resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
        } catch (Exception ex) {
            throw new SpeedFrameworkException(ex);
        }

        return resultString;
    }
}