MD5加密算法

来源：互联网发布：nginx配置server详解编辑：程序博客网时间：2024/05/29 18:55

import java.security.NoSuchAlgorithmException;
import java.security.MessageDigest;

public abstract class MD5EncryptUtils {

    private MD5EncryptUtils() {
    }

    public static String MD5Encode(String origin) {
        MessageDigest md = null;
        try {
            md = MessageDigest.getInstance("MD5");
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return byteArrayToString(md.digest(origin.getBytes()));
    }

     /**
     * 转换字节数组为16进制字符串或者全数组字符串
     * @param b 字节数组
     * @return 16进制字串
     */
    private static String byteArrayToString(byte[] b) {
        StringBuffer resultSb = new StringBuffer();
        for (int i = 0;i<b.length;i++) {
            byte aB = b[i];
            resultSb.append(byteToHexString(aB));
        }
        return resultSb.toString();
    }

    /**
     * 转换字节数组为十六进制字符串
     * @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];
    }

    /**
     * 十六进制字符
     */
    private final static String[] hexDigits = {
            "0", "1", "2", "3", "4", "5", "6","7",
            "8", "9", "a", "b", "c", "d", "e","f"};

    public static void main(String[] args) {
        System.out.println("-------->"+MD5Encode("123"));
    }
}