MD5加密工具 MD5Utils

 1 public class MD5Utils {
 2     private static final int    SIGNUM      = 1;
 3     /**
 4      * hex值
 5      */
 6     private static final int    HEX_FLAG    = 16;
 7     /**
 8      * 签名的长度
 9      */
10     private static final int    SIGN_LENGTH = 32;
11     /**
12      * 填充值
13      */
14     private static final String FILL_CHAR   = "0";
15     /**
16      * md5 32位加密方法
17      *
18      * @param input
19      * @return
20      */
21     public static String getMd5(String input) {
22         try {
23             MessageDigest md = MessageDigest.getInstance("MD5");
24             byte[] messageDigest = md.digest(input.getBytes(Charset.forName("UTF-8")));
25             BigInteger number = new BigInteger(SIGNUM, messageDigest);
26             String hashtext = number.toString(HEX_FLAG);
27             while (hashtext.length() < SIGN_LENGTH) {
28                 hashtext = FILL_CHAR + hashtext;
29             }
30             return hashtext.toUpperCase();
31         } catch (NoSuchAlgorithmException e) {
32             throw new RuntimeException(e);
33         }
34     }
35 
36     public static void main(String[] args) {
37 
38         // 方式一: 使用自定义的MD5加密工具类
39         String password = MD5Utils.getMd5("abc123ABC");
40         System.out.println("password："+ password);
41 
42         // 加盐，随机生成6位数字和字母混合的字符串
43         String salt = RandomStringUtils.randomAlphanumeric(6);
44         System.out.println("salt：" + salt);
45 
46         String saltPassword = MD5Utils.getMd5("abc123ABC" + salt);
47         System.out.println("saltPassword：" + saltPassword);
48 
49         // 方式二: 使用springboot自带的MD5加密封装类DigestUtils
50         String pwd = DigestUtils.md5DigestAsHex("abc123ABC".getBytes());
51         System.out.println("pwd：" + pwd.toUpperCase());
52     }
53 }