jwtUtils顾名思意

 1 package com.pipihao.blog.util;
 2 import java.util.Date;
 3   
 4 import javax.crypto.SecretKey;
 5 import javax.crypto.spec.SecretKeySpec;
 6   
 7 import org.apache.commons.codec.binary.Base64;
 8   
 9 import com.alibaba.fastjson.JSONObject;
10 import io.jsonwebtoken.Claims;
11 import io.jsonwebtoken.ExpiredJwtException;
12 import io.jsonwebtoken.JwtBuilder;
13 import io.jsonwebtoken.Jwts;
14 import io.jsonwebtoken.MalformedJwtException;
15 import io.jsonwebtoken.SignatureAlgorithm;
16 import io.jsonwebtoken.SignatureException;
17 import io.jsonwebtoken.UnsupportedJwtException;
18   
19 /**
20  * JWTUtils工具类,生成jwt和解析jwt
21  * JSON WEB TOKEN 结构组成:
22  * (1)Header(头部):包含加密算法,通常直接使用 HMAC SHA256
23  * (2)Payload(负载):存放有效信息,比如消息体、签发者、过期时间、签发时间等
24  * (3)Signature(签名):由header(base64后的)+payload(base64后的)+secret(秘钥)三部分组合,然后通过head中声明的算法进行加密
25  * @author sixmonth
26  * @date 2019年3月20日
27  *
28  */
29 public class JWTUtils {
30      
31     static String SECRETKEY = "KJHUhjjJYgYUllVbXhKDHXhkSyHjlNiVkYzWTBac1Yxkjhuad";
32   
33     /**
34      * 由字符串生成加密key
35      * @return
36      */
37     public static SecretKey generalKey(String stringKey) {
38         byte[] encodedKey = Base64.decodeBase64(stringKey);
39         SecretKey key = new SecretKeySpec(encodedKey, 0, encodedKey.length, "AES");
40         return key;
41     }
42   
43     /**
44      * 创建jwt
45      * @param uuid 唯一id,uuid即可
46      * @param subject json形式字符串或字符串,增加用户非敏感信息存储,如用户id或用户账号,与token解析后进行对比,防止乱用
47      * @param expirationDate  生成jwt的有效期,单位秒
48      * @return jwt token
49      * @throws Exception
50      */
51     public static String createJWT(String uuid, String subject, long expirationDate) throws Exception {
52         SignatureAlgorithm signatureAlgorithm = SignatureAlgorithm.HS256;
53         long nowMillis = System.currentTimeMillis();
54         Date now = new Date(nowMillis);
55         SecretKey key = generalKey(SECRETKEY);
56         JwtBuilder builder = Jwts.builder().setIssuer("").setId(uuid).setIssuedAt(now).setSubject(subject)
57                 .signWith(signatureAlgorithm, key);
58         if (expirationDate >= 0) {
59             long expMillis = nowMillis + expirationDate*1000;
60             Date exp = new Date(expMillis);
61             builder.setExpiration(exp);
62         }
63         return builder.compact();
64     }
65   
66     /**
67      * 解密jwt,获取实体
68      * @param jwt
69      */
70     public static Claims parseJWT(String jwt) throws ExpiredJwtException, UnsupportedJwtException,
71             MalformedJwtException, SignatureException, IllegalArgumentException {
72         SecretKey key = generalKey(SECRETKEY);
73         Claims claims = Jwts.parser().setSigningKey(key).parseClaimsJws(jwt).getBody();
74         return claims;
75     }
76   
77     /**
78     * 实例演示
79     */
80     public static void main(String[] args) {
81         try {
82             JSONObject subject = new JSONObject(true);
83             subject.put("tem", "哈哈哈");
84             subject.put("userName", "sixmonth");
85             String token = createJWT(UUIDUtils.getUUID(), subject.toJSONString(), 10);//10秒过期
86             //System.out.println(token);
87             Claims claims = parseJWT(token);
88             System.out.println("解析jwt:"+claims.getSubject());
89             JSONObject tem = JSONObject.parseObject(claims.getSubject());
90             System.out.println("获取json对象内容:"+tem.getString("userName"));   
91             System.out.println(claims.getExpiration()+"///"+claims.getExpiration().getTime());
92         } catch (Exception e) {
93             e.printStackTrace();
94         }
95     }
96 }
97  

 

posted @ 2020-09-05 09:24  皮豪  阅读(714)  评论(1编辑  收藏  举报