SpringBoot使用jwt

引入依赖

<!-- JWT依赖 -->
<dependency>
  <groupId>io.jsonwebtoken</groupId>
  <artifactId>jjwt</artifactId>
  <version>0.7.0</version>
</dependency>
<dependency>
  <groupId>javax.xml.bind</groupId>
  <artifactId>jaxb-api</artifactId>
  <version>2.3.1</version>
</dependency>

JWT工具类：

/**
 * JWT工具类
 */
public class JwtUtil {

    //有效期为
    public static final Long JWT_TTL = 60 * 60 *1000L;// 60 * 60 *1000  一个小时
    //设置秘钥明文
    public static final String JWT_KEY = "sangeng";

    public static String getUUID(){
        String token = UUID.randomUUID().toString().replaceAll("-", "");
        return token;
    }
    
    /**
     * 生成jtw
     * @param subject token中要存放的数据（json格式）
     * @return
     */
    public static String createJWT(String subject) {
        JwtBuilder builder = getJwtBuilder(subject, null, getUUID());// 设置过期时间
        return builder.compact();
    }




    /**
     * 生成jtw
     * @param subject token中要存放的数据（json格式）
     * @param ttlMillis token超时时间
     * @return
     */
    public static String createJWT(String subject, Long ttlMillis) {
        JwtBuilder builder = getJwtBuilder(subject, ttlMillis, getUUID());// 设置过期时间
        return builder.compact();
    }

    private static JwtBuilder getJwtBuilder(String subject, Long ttlMillis, String uuid) {
        SignatureAlgorithm signatureAlgorithm = SignatureAlgorithm.HS256;
        SecretKey secretKey = generalKey();
        long nowMillis = System.currentTimeMillis();
        Date now = new Date(nowMillis);
        if(ttlMillis==null){
            ttlMillis=JwtUtil.JWT_TTL;
        }
        long expMillis = nowMillis + ttlMillis;
        Date expDate = new Date(expMillis);
        return Jwts.builder()
                .setId(uuid)              //唯一的ID
                .setSubject(subject)   // 主题  可以是JSON数据
                .setIssuer("sg")     // 签发者
                .setIssuedAt(now)      // 签发时间
                .signWith(signatureAlgorithm, secretKey) //使用HS256对称加密算法签名, 第二个参数为秘钥
                .setExpiration(expDate);
    }

    /**
     * 创建token
     * @param id
     * @param subject
     * @param ttlMillis
     * @return
     */
    public static String createJWT(String id, String subject, Long ttlMillis) {
        JwtBuilder builder = getJwtBuilder(subject, ttlMillis, id);// 设置过期时间
        return builder.compact();
    }

    public static void main(String[] args) throws Exception {
//        String jwt = createJWT("1234");
//        System.out.println(jwt);
        Claims claims = parseJWT("eyJhbGciOiJIUzI1NiJ9.eyJqdGkiOiI1YjcxOTBhYzFiYTE0MTBjYmYyZjJhZWMxYzc0NmFhMyIsInN1YiI6IjMiLCJpc3MiOiJzZyIsImlhdCI6MTY2MDQ3MDc3NywiZXhwIjoxNjYwNDc0Mzc3fQ.sx7R9aoQoAjJBYyDg3olcewQH3FUf5tXyUTRSC0661c");
        String subject = claims.getSubject();
        System.out.println(subject);
    }

    /**
     * 生成加密后的秘钥 secretKey
     * @return
     */
    public static SecretKey generalKey() {
        byte[] encodedKey = Base64.getDecoder().decode(JwtUtil.JWT_KEY);
        SecretKey key = new SecretKeySpec(encodedKey, 0, encodedKey.length, "AES");
        return key;
    }
    
    /**
     * 解析
     *
     * @param jwt
     * @return
     * @throws Exception
     */
    public static Claims parseJWT(String jwt) throws Exception {
        SecretKey secretKey = generalKey();
        return Jwts.parser()
                .setSigningKey(secretKey)
                .parseClaimsJws(jwt)
                .getBody();
    }


}

注意：

​ Springboot2.6以后将SpringMVC 默认路径匹配策略从AntPathMatcher 更改为PathPatternParser，会报
Failed to start bean ‘documentationPluginsBootstrapper’; nested exception is java.lang.NullPointerException 错。

需要在配置文件加入：

spring:
  mvc:
    pathmatch:
      matching-strategy: ant_path_matcher

或

spring.mvc.pathmatch.matching-strategy=ANT_PATH_MATCHER