springSecurity：实现登入获取token与解析token

import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
import io.jsonwebtoken.*;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.function.Function;
import java.util.stream.Collectors;
 
public class JwtTokenUtil {
    private static final String AUTHORITIES_KEY = "auth";
 
    private String secretKey;
    private long tokenValidityInMilliseconds;
    private long tokenValidityInMillisecondsForRememberMe;
 
    public JwtTokenUtil(String secretKey, long tokenValidityInSeconds, long tokenValidityInSecondsForRememberMe) {
        this.secretKey = secretKey;
 
        this.tokenValidityInMilliseconds = tokenValidityInSeconds * 1000;
        this.tokenValidityInMillisecondsForRememberMe = tokenValidityInSecondsForRememberMe * 1000;
    }
 
    public String createToken(Authentication authentication, boolean rememberMe) {
        String authorities = authentication.getAuthorities().stream()
                .map(GrantedAuthority::getAuthority)
                .collect(Collectors.joining(","));
 
        long now = (new Date()).getTime();
        Date validity;
        if (rememberMe) {
            validity = new Date(now + this.tokenValidityInMillisecondsForRememberMe);
        } else {
            validity = new Date(now + this.tokenValidityInMilliseconds);
        }
 
        return Jwts.builder()
                .setSubject(authentication.getName())
                .claim(AUTHORITIES_KEY, authorities)
                .signWith(SignatureAlgorithm.HS512, secretKey)
                .setExpiration(validity)
                .compact();
    }
 
    public Authentication getAuthentication(String token) {
        Claims claims = Jwts.parser()
                .setSigningKey(secretKey)
                .parseClaimsJws(token)
                .getBody();
 
        Collection<? extends GrantedAuthority> authorities =
                Arrays.stream(claims.get(AUTHORITIES_KEY).toString().split(","))
                        .map(Authority::new)
                        .collect(Collectors.toList());
 
        UserDetails principal = new User(claims.getSubject(), "", authorities);
 
        return new UsernamePasswordAuthenticationToken(principal, token, authorities);
    }
 
    public boolean validateToken(String a