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package com.alan344happyframework.util;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * @author AlanSun
 */
public final class MD5Util {
    /**
     * 对字符串md5加密
     *
     * @param str str
     * @return 加密后的字符串
     */
    public static String MD5(String str) throws NoSuchAlgorithmException {
        // 生成一个MD5加密计算摘要
        MessageDigest md = MessageDigest.getInstance("MD5");
        // 计算md5函数
        md.update(str.getBytes());
        // digest()最后确定返回md5 hash值,返回值为8为字符串。因为md5 hash值是16位的hex值,实际上就是8位的字符
        // BigInteger函数则将8位的字符串转换成16位hex值,用字符串来表示;得到字符串形式的hash值
        return new BigInteger(1, md.digest()).toString(16);
    }
}




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