1、5 写注册的后台并写前台html&密码加密&id 随机

1     public void save(Student student) {
         // TODO Auto-generated method stub
       student.setSid(UUID.randomUUID().toString());
         student.setPwd(MD5Util.md5(student.getPwd()));
         studentRepository.save(student);
     }

在保存之前对密码加密，下面是加密的工具类

 package com.bw.utils;

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

 public class MD5Util {

     public static String md5(String passwd) {
         StringBuffer md5Str = new StringBuffer();
         try {
             MessageDigest md5 = MessageDigest.getInstance("MD5");
             byte[] digest = md5.digest(passwd.getBytes());
             for (byte b : digest) {
                 md5Str.append(String.format("%02x", b));
             }
         } catch (NoSuchAlgorithmException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         return md5Str.toString();
     }
 }