JWT基本使用方法

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactid>spring-boot-starter-security</artifactid>
</dependency>

public class JWTUtils {

    private static final String SING="12345678";
    //生成token
    public static String getToken(Map<String,String> map){
        Calendar instance = Calendar.getInstance();
        instance.add(Calendar.SECOND, 30);//过期

        JWTCreator.Builder builder = JWT.create();
        map.forEach((k,v)->{
            builder.withClaim(k,v);
            });
        String token = builder.withExpiresAt(instance.getTime())
                .sign(Algorithm.HMAC256(SING));
        return token;
    }
        //验证token合法性
        public static DecodedJWT verify(String token){
                return JWT.require(Algorithm.HMAC256(SING)).build().verify(token);
        }

}

public class JWTInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,Object handler) throws IOException {
        Map<String,Object> map = new HashMap<>();
        //获取请求头中令牌
        String token = request.getHeader("token");
        try {
            JWTUtils.verify(token);
            return true;
        }catch (SignatureVerificationException e){
            e.printStackTrace();
            map.put("msg","无效签名!");
        }catch (TokenExpiredException e){
            e.printStackTrace();
            map.put("msg","token过期!");
            }catch (AlgorithmMismatchException e) {
            e.printStackTrace();
            map.put("msg", "token算法不一致!");
        }
        catch (Exception e) {
            e.printStackTrace();
            map.put("msg", "token无效");
        }
            map.put("state",false);//设置状态
            //将map 专为json jackson
            String json = new ObjectMapper().writeValueAsString(map);
            response.setContentType("application/json;charset=UTF-8");
            response.getWriter().println(json);
            return false;
    }
}

@Component
public class JWTConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry){
        registry.addInterceptor(new JWTInterceptor())
                .addPathPatterns("/**")
                .excludePathPatterns("/jc/login");
    }
}

Map<String,String> map=new HashMap<>();
map.put("uname", userm.getName());
String token=JWTUtils.getToken(map);

String token=request.getHeader("token");
DecodedJWT verify= JWTUtils.verify(token);
String uname=verify.getClaim("uname").asString();