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

import com.auth0.jwt.JWT;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.interfaces.Claim;
import com.itbaizhan.shopping_common.exception.BusException;
import com.itbaizhan.shopping_common.pojo.ShoppingUser;
import com.itbaizhan.shopping_common.result.CodeEnum;
import java.util.Date;
public class JWTUtil {
    //token過(guò)期時(shí)間，一天
    private static final Long EXPIRE_DATE = 1000*60*60*24L;
    // 秘鑰
    private static final String SECRET = "jackie";
    // 簽發(fā)者
    private static final String ISSUER = "JACKIE";
    /**
     * 簽名生成
     * @param shoppingUser
     * @return
     */
    public static String sign(ShoppingUser shoppingUser){
        String token = JWT.create()
                .withIssuer(ISSUER) // 簽發(fā)者
                .withIssuedAt(new Date()) // 簽發(fā)時(shí)間
                .withExpiresAt(new Date(new Date().getTime() + EXPIRE_DATE)) // 過(guò)期時(shí)間
                .withSubject(shoppingUser.getUsername()) // 保存用戶名
                .withClaim("userId",shoppingUser.getId()) // 保存用戶id
                .sign(Algorithm.HMAC256(SECRET)); // 秘鑰
        return token;
    }
    /**
     * 簽名解析
     * @param token 簽名字符串
     * @return 解析得出的用戶名
     */
    public static String verify(String token){
        try {
            String username = JWT
                    .require(Algorithm.HMAC256(SECRET))
                    .withIssuer(ISSUER)
                    .build()
                    .verify(token)
                    .getSubject();
            return username;
        } catch (Exception e){
            throw new BusException(CodeEnum.VERIFY_TOKEN_ERROR);
        }
    }
    /**
     * 簽名解析，獲取用戶id
     * @param token 簽名字符串
     * @return 用戶id
     */
    public static Long getId(String token){
        try {
            Long userId = JWT
                    .require(Algorithm.HMAC256(SECRET))
                    .withIssuer(ISSUER)
                    .build()
                    .verify(token)
                    .getClaim("userId")
                    .asLong();
            return userId;
        } catch (Exception e){
            throw new BusException(CodeEnum.VERIFY_TOKEN_ERROR);
        }
    }
}

 @Override
    public String loginPassword(String username, String password) {
        // 1.驗(yàn)證用戶名
        QueryWrapper<ShoppingUser> queryWrapper = new QueryWrapper();
        queryWrapper.eq("username",username);
        ShoppingUser shoppingUser = shoppingUserMapper.selectOne(queryWrapper);
        if (shoppingUser == null){
            throw new BusException(CodeEnum.LOGIN_NAME_PASSWORD_ERROR);
        }
        // 2.驗(yàn)證密碼
        boolean verify = Md5Util.verify(password, shoppingUser.getPassword());
        if (!verify){
            throw new BusException(CodeEnum.LOGIN_NAME_PASSWORD_ERROR);
        }
        // 3.生成JWT令牌，返回令牌
        String sign = JWTUtil.sign(shoppingUser);
        return sign;
    }

 /**
     * 用戶名密碼登錄
     * @param shoppingUser 用戶對(duì)象
     * @return 登錄結(jié)果
     */
    @PostMapping("/loginPassword")
    public BaseResult loginPassword(@RequestBody ShoppingUser shoppingUser){
        String sign = shoppingUserService.loginPassword(shoppingUser.getUsername(), shoppingUser.getPassword());
        return BaseResult.ok(sign);
    }

// 攔截器，驗(yàn)證令牌
public class JWTInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 獲取請(qǐng)求頭中的token
        String token = request.getHeader("token");
        // 驗(yàn)證令牌
        JWTUtil.verify(token);
        return true;
    }
}

// 攔截器配置
@Configuration
public class InterceptorConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new JWTInterceptor())
                .addPathPatterns("/**") // 攔截的接口
                .excludePathPatterns(
                       "填寫(xiě)需要放行的接口url"
                ); //放行的接口
    }
}