JWT初学-生成与解密

╰半橙微兮° 2022-04-21 22:54 218阅读 0赞

[JWT初学-简单了解一下][JWT_-]

[demo代码git地址][demo_git]

**jwt的maven依赖**

<dependency>
                <groupId>io.jsonwebtoken</groupId>
                <artifactId>jjwt</artifactId>
                <version>0.9.0</version>
            </dependency>

json和实体类互转的依赖

<dependency>
                <groupId>com.google.code.gson</groupId>
                <artifactId>gson</artifactId>
                <version>2.8.5</version>
            </dependency>

--------------------

首先生成加密的秘钥

public SecretKey generalKey(){
            SecretKey secretKey = new SecretKeySpec(secret.getBytes(),SignatureAlgorithm.HS256.getJcaName());
            return secretKey;
        }

**创建jwt（加密算法+过期时间+实体内容+秘钥）**

public String createJWT(String id,String subject){
            //加密算法
            SignatureAlgorithm signatureAlgorithm = SignatureAlgorithm.HS256;
            //设置时间
            Calendar calendar = Calendar.getInstance();
            Date date = calendar.getTime();
            //过期时间
            calendar.setTimeInMillis(date.getTime()+millis);
            Date expirationDate = calendar.getTime();
            SecretKey secretKey = generalKey();
            JwtBuilder builder = Jwts.builder()
                    .setId(id)
                    .setIssuedAt(date)
                    .setSubject(subject)
                    .signWith(signatureAlgorithm,secretKey)
                    .setExpiration(expirationDate);
            return builder.compact();
        }

**解码jwt**

public String parseJWT(String jwt){
            SecretKey secretKey = generalKey();
            return Jwts.parser().setSigningKey(secretKey).parseClaimsJws(jwt).getBody().getSubject();
        }

获取过期时间

public Date expirateTime(String jwt){
            SecretKey secretKey = generalKey();
            return Jwts.parser().setSigningKey(secretKey).parseClaimsJws(jwt).getBody().getExpiration();
        }

--------------------

**我们在操作jwt时，传入参数和返回的参数都是json字符串**

public class Json {
    
        /**
         * 将对象转化成json字符串
         * @param object
         * @return
         */
        public String objetcToJson(Object object){
            Gson gson = new Gson();
            return gson.toJson(object);
        }
    
        public Object jsonToObject(String json,Class beanClass){
            Gson gson = new Gson();
            return gson.fromJson(json,beanClass);
        }
    }

实体类对象

public class UserPo {
        private String id;
        private String name;
        private int age;
        private boolean isMan;
    
        public String getId() {
            return id;
        }
    
        public void setId(String id) {
            this.id = id;
        }
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public int getAge() {
            return age;
        }
    
        public void setAge(int age) {
            this.age = age;
        }
    
        public boolean isMan() {
            return isMan;
        }
    
        public void setMan(boolean man) {
            isMan = man;
        }
    }

[JWT_-]: https://blog.csdn.net/qq_34819372/article/details/83588356
[demo_git]: http://github.com/jwt.git