DefaultJwtParser:如何简单地解码JWT？(无密钥，无验证)

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.security.Keys;

public class JwtDecoder {
    public static void main(String[] args) {
        String jwt = "your_jwt_string_here";
        
        // 创建DefaultJwtParser对象
        DefaultJwtParser jwtParser = Jwts.parserBuilder().build();
        
        // 解码JWT
        Claims claims = jwtParser.parseClaimsJwt(jwt).getBody();
        
        // 获取JWT的声明信息
        String username = claims.getSubject();
        String role = claims.get("role", String.class);
        
        System.out.println("Username: " + username);
        System.out.println("Role: " + role);
    }
}