引入依賴：

        <dependency>
            <groupId>com.auth0</groupId>
            <artifactId>java-jwt</artifactId>
            <version>3.4.0</version>
        </dependency>

生成token程式碼：

    public static void main(String[] args) throws IOException {
        Calendar calendar = Calendar.getInstance();
        calendar.add(Calendar.SECOND, 90);
        HashMap<String, Object> map = new HashMap<>();
        String sign = JWT.create().withHeader(map).withClaim("username", "name").withClaim("authority", "admin").withExpiresAt(calendar.getTime()).sign(Algorithm.HMAC256("VcXsdn!AG#R#a+d@asda&*HJKASD"));
        System.out.println(sign);
    }
 

工具類：

public class JWTUtils {
    private static final String SALT = "ASD$123*X7m";

    public static String getToken(Map<String, String> map) {
        JWTCreator.Builder builder = JWT.create();
        map.forEach((k, v) -> {
            builder.withClaim(k, v);
        });
        Calendar calendar = Calendar.getInstance();
        calendar.add(Calendar.MINUTE, 2);
        builder.withExpiresAt(calendar.getTime());
        return builder.sign(Algorithm.HMAC256(SALT));
    }

    public static DecodedJWT verify(String token) {
        JWTVerifier verifier = JWT.require(Algorithm.HMAC256(SALT)).build();
        return verifier.verify(token);
    }
}