Spring boot 使用JWT

引入pom.xml依赖

    io.jsonwebtoken
    jjwt
    0.9.1

jdk1.8以上还需要引入3个辅助包

编写代码：

@SpringBootTest
class JwtApplicationTests {

    private long time=1000*60*24;//1天的时间
    private String singature="admin";//签名的key
    @Test
    void contextLoads() {
        JwtBuilder builder = Jwts.builder();
        String jwtToken=builder
                        //header
                        .setHeaderParam("typ","JWT")
                        .setHeaderParam("alg","HS256")
                        //payload
                        .claim("username","tom") //用户名
                        .claim("role","admin")//用户身份
                        .setSubject("admin-test")//主题，随便写的
                        .setExpiration(new Date(System.currentTimeMillis()+time))//过期时间，设置1天
                        .setId(UUID.randomUUID().toString())//id
                        .signWith(SignatureAlgorithm.HS256,singature).compact();//使用HS256加密并拼接

        System.out.println(jwtToken);
    }


    @Test
    void parseToken(){//解密token
        String token="eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJ1c2VybmFtZSI6InRvbSIsInJvbGUiOiJhZG1pbiIsInN1YiI6ImFkbWluLXRlc3QiLCJleHAiOjE2Mzc4MjI5MTMsImp0aSI6IjM3YjgyZGU4LWU5M2EtNGE4MC05NTRiLWRjZTI0YzQ0ZDM3ZCJ9.S6FZ77bLtpZJXF15QT3xWr8X06PJbW5QQz8wshkLULI";
        JwtParser jwtParser=Jwts.parser();
        jwtParser.setSigningKey(singature);
        Jws claimsJwt = jwtParser.parseClaimsJws(token);
        Claims body = claimsJwt.getBody();

        body.get("username");//获取用户名
        body.getExpiration();//过期时间

        Iterator> iterator = body.entrySet().iterator();
        while (iterator.hasNext()){
            System.out.println(iterator.next().getValue());
        }
    }

}