工具代码（一）：MD5加密

来源：互联网发布：四川大学软件学院考研编辑：程序博客网时间：2024/06/06 21:07

别人的代码

import java.security.MessageDigest;/** * User: rizenguo * Date: 2014/10/23 * Time: 15:43 */public class MD5 {    private final static String[] hexDigits = {"0", "1", "2", "3", "4", "5", "6", "7",            "8", "9", "a", "b", "c", "d", "e", "f"};    /**     * 转换字节数组为16进制字串     * @param b 字节数组     * @return 16进制字串     */    public static String byteArrayToHexString(byte[] b) {        StringBuilder resultSb = new StringBuilder();        for (byte aB : b) {            resultSb.append(byteToHexString(aB));        }        return resultSb.toString();    }    /**     * 转换byte到16进制     * @param b 要转换的byte     * @return 16进制格式     */    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];    }    /**     * MD5编码     * @param origin 原始字符串     * @return 经过MD5加密之后的结果     */    public static String MD5Encode(String origin) {        String resultString = null;        try {            resultString = origin;            MessageDigest md = MessageDigest.getInstance("MD5");            resultString = byteArrayToHexString(md.digest(resultString.getBytes()));        } catch (Exception e) {            e.printStackTrace();        }        return resultString;    }}

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