架构师训练营 0 期 11 周

package com.data;import java.security.MessageDigest;import java.security.NoSuchAlgorithmException;import java.util.Objects;

public class Md5Test {    /***     * 当前用户ID     */    static String cUserId = "zhangsan";
    public static void main(String[] args) {       Boolean flag = checkPW("zhangsan","123456","e10adc3949ba59abbe56e057f20f883e");       if(flag){           System.out.println("用户名密码相同");       }else{           System.out.println("用户名密码不同");       }    }    /**     * 密码校验函数     * @param userId 用户ID     * @param pwd 密码明文     * @param security  密码密文     * @return     */    public static Boolean checkPW(String userId,String pwd, String security){        if(Objects.equals(userId,cUserId) && Objects.equals(getMD5(pwd),security)){            return true;        }else{            return false;        }    }
    /**     * 获取MD5     * @param plainText 元字符串     * @return 返回字符串     */    public static String getMD5(String plainText) {        try {            MessageDigest md = MessageDigest.getInstance("MD5");//获取MD5实例            md.update(plainText.getBytes());//此处传入要加密的byte类型值            byte[] digest = md.digest();//此处得到的是md5加密后的byte类型值            int i;            StringBuilder sb = new StringBuilder();            for (int offset = 0; offset < digest.length; offset++) {                i = digest[offset];                if (i < 0)                    i += 256;                if (i < 16)                    sb.append(0);                sb.append(Integer.toHexString(i));//通过Integer.toHexString方法把值变为16进制            }            return sb.toString();        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();            return null;        }    }}