JWT 和MD5加密工具类的封装是使用

jwt

  1 package com.atguigu.common.jwt;
  2 
  3 import io.jsonwebtoken.*;
  4 import org.springframework.util.StringUtils;
  5 
  6 import java.util.Date;
  7 
  8 //jwt工具类
  9 public class JwtHelper {
 10 
 11     private static long tokenExpiration = 60 * 60 * 24;
 12     private static String tokenSignKey = "123456";
 13 
 14     //根据用户id和用户名称生成token字符串
 15     public static String createToken(Long userId, String username) {
 16         String token = Jwts.builder()
 17                 //分类
 18                 .setSubject("AUTH-USER")
 19 
 20                 //设置token有效时长
 21                 .setExpiration(new Date(System.currentTimeMillis() + tokenExpiration))
 22 
 23                 //设置主体部分
 24                 .claim("userId", userId)
 25                 .claim("username", username)
 26 
 27                 //签名部分
 28                 .signWith(SignatureAlgorithm.HS512, tokenSignKey)
 29                 .compressWith(CompressionCodecs.GZIP)
 30                 .compact();
 31         return token;
 32     }
 33 
 34     //从生成token字符串获取用户id
 35     public static Long getUserId(String token) {
 36         try {
 37             if (StringUtils.isEmpty(token)) {
 38                 return null;
 39             }
 40 
 41             Jws<Claims> claimsJws = Jwts.parser().setSigningKey(tokenSignKey).parseClaimsJws(token);
 42             Claims claims = claimsJws.getBody();
 43             Integer userId = (Integer) claims.get("userId");
 44             return userId.longValue();
 45         } catch (Exception e) {
 46             e.printStackTrace();
 47             return null;
 48         }
 49     }
 50 
 51     //从生成token字符串获取用户名称
 52     public static String getUsername(String token) {
 53         try {
 54             if (StringUtils.isEmpty(token)) return "";
 55 
 56             Jws<Claims> claimsJws = Jwts.parser().setSigningKey(tokenSignKey).parseClaimsJws(token);
 57             Claims claims = claimsJws.getBody();
 58             return (String) claims.get("username");
 59         } catch (Exception e) {
 60             e.printStackTrace();
 61             return null;
 62         }
 63     }
 64 
 65     public static void sleepUtil(int time){
 66         try {
 67             Thread.sleep(time);
 68         } catch (InterruptedException e) {
 69             e.printStackTrace();
 70         }
 71     }
 72 
 73     public static void sleepUtil(){
 74         sleepUtil(200);
 75     }
 76 
 77     /**
 78      * 判断token是否过期
 79      * @return true: 过期    false: 没有过期
 80      */
 81     public static boolean isExpiration(String token){
 82 
 83 //        sleepUtil();
 84 
 85 
 86 
 87         if(StringUtils.isEmpty(token)){
 88             System.out.println("不是合法token");
 89             return true;
 90         }
 91 
 92         try {
 93             Jws<Claims> claim = Jwts.parser().setSigningKey(tokenSignKey).parseClaimsJws(token);
 94             Claims body = claim.getBody();
 95             Date expiration = body.getExpiration();
 96 
 97             long expirationTime = expiration.getTime();
 98 
 99             long now = System.currentTimeMillis();
100 
101             if(now - expirationTime < 0){
102                 return false;
103             }
104         } catch (Exception e) {
105             System.out.println("已经过期了");
106             return true;
107         }
108 
109         return false;
110     }
111 
112     public static void main(String[] args) {
113         String token = createToken(1l, "admin");
114 
115         System.out.println(isExpiration(token));
116     }
117 }

md5  特点是单向加密，无法还原

代码

package com.atguigu.common.utils;

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


public final class MD5 {

    public static String encrypt(String strSrc) {
        try {
            char hexChars[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8',
                    '9', 'a', 'b', 'c', 'd', 'e', 'f' };
            byte[] bytes = strSrc.getBytes();
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(bytes);
            bytes = md.digest();
            int j = bytes.length;
            char[] chars = new char[j * 2];
            int k = 0;
            for (int i = 0; i < bytes.length; i++) {
                byte b = bytes[i];
                chars[k++] = hexChars[b >>> 4 & 0xf];
                chars[k++] = hexChars[b & 0xf];
            }
            return new String(chars);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            throw new RuntimeException("MD5加密出错！！+" + e);
        }
    }

    public static void main(String[] args) {
        System.out.println(MD5.encrypt("111111"));
    }
}