JWT极简入门-案例演示

╰+哭是因爲堅強的太久メ 2022-09-04 12:43 140阅读 0赞

环境：IDEA开发工具，JDK8  
pom

<dependency>
                <groupId>io.jsonwebtoken</groupId>
                <artifactId>jjwt</artifactId>
                <version>0.9.1</version>
            </dependency>

Java测试代码

import io.jsonwebtoken.Claims;
    import io.jsonwebtoken.Jws;
    import io.jsonwebtoken.JwsHeader;
    import io.jsonwebtoken.JwtBuilder;
    import io.jsonwebtoken.JwtParser;
    import io.jsonwebtoken.Jwts;
    import io.jsonwebtoken.SignatureAlgorithm;
    import org.junit.jupiter.api.Test;
    
    import java.util.Date;
    import java.util.UUID;
    
    private  long time = 1000*60*60*24;
        private  String signature="secret";
        @Test
        public void jwt(){ 
            JwtBuilder builder = Jwts.builder();
            String jwtToken = builder
                    //header
                    .setHeaderParam("typ","JWT")
                    .setHeaderParam("alg","HS256")
                    //payload
                    .claim("username","tom")
                    .claim("role","admin")
                    .setSubject("admin-test")
                    .setExpiration(new Date(System.currentTimeMillis()+time))
                    .setId(UUID.randomUUID().toString())
                    //signature
                    .signWith(SignatureAlgorithm.HS256,signature)
                    .compact();
            System.out.println(jwtToken);
        }
    
        @Test
        public void parse(){ 
            String token = "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJ1c2VybmFtZSI6InRvbSIsInJvbGUiOiJhZG1pbiIsInN1YiI6ImFkbWluLXRlc3QiLCJleHAiOjE2Mjg5NDkwNTksImp0aSI6ImZkZDUxYWM5LTUyNTAtNGY0NC04NTc4LWMwNTU0MmMzY2Q4YyJ9.8HwfUWvRRbUGwV-UTIQHsateZTlUfwhg859C2WP2Gvg";
            JwtParser parser = Jwts.parser();
            Jws<Claims> claimsJws = parser.setSigningKey(signature).parseClaimsJws(token);
            Claims claims = claimsJws.getBody();
            System.out.println("username:"+claims.get("username"));
            System.out.println("role:"+claims.get("role"));
            System.out.println("ID:"+claims.getId());
            System.out.println("Subject:"+claims.getSubject());
            System.out.println("Expiration:"+claims.getExpiration());
            String signature = claimsJws.getSignature();
            System.out.println("signature:"+signature);
            JwsHeader header = claimsJws.getHeader();
            System.out.println("typ:"+header.get("typ"));
            System.out.println("alg:"+header.get("alg"));
        }