记springmvc集成jwt鉴权

jwt鉴权就不多说了,自行百度...
网上关于springmvc集成的jwt的文章不少,但是都稍显复杂了一点..

1.引入jjwt

JJWT aims to be the easiest to use and understand library for creating and verifying JSON Web Tokens (JWTs) on the JVM.

maven pom.xml

      io.jsonwebtoken
      jjwt
      0.9.0

2.写个工具类简单封装一下创建和鉴权步骤
注意:jwt标准注册声明中比较重要的就是exp字段,用于判断token是否过期,其他的可以按照个人喜好情况自行添加.

public class Jwt {
    private static String key = "WkskpDhSkuBUOP*ITB*123123123";
    public  static  String createJwt(String userId){
        //默认签发有效期24小时的token
        return createJwt(userId,"subject","issure",86400000);
    }
    public static String createJwt(String id, String subject, String issure, long till) {
        JwtBuilder jwtBuilder = Jwts.builder().setId(id)
                .signWith(SignatureAlgorithm.HS256, new SecretKeySpec(DatatypeConverter.parseBase64Binary(key), SignatureAlgorithm.HS256.getJcaName()))
                .setIssuer(issure)
                .setSubject(subject)
                .setExpiration(new Date(System.currentTimeMillis() + till));
        return jwtBuilder.compact();
    }

    public static Claims parseJwt(String token) throws Exception {
        Claims claims = Jwts.parser().setSigningKey(DatatypeConverter.parseBase64Binary(key)).parseClaimsJws(token).getBody();
        return claims;


    }
}

3.拦截器使用鉴权
注意:这里我们只判断token是否伪造和过期,不在拦截器里面判断用户权限信息.
这里token我们默认加上bearer加空格前缀。。。

public class ApiInterceptor extends HandlerInterceptorAdapter {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String authorization=request.getHeader("Authorization");
        if(authorization == null || ! authorization.startsWith("Bearer ")){
            this.setErrorResponse(response,"未携带token");
            return false;
        }
        String token=authorization.substring(7);
        try {
            request.setAttribute("user",Jwt.parseJwt(token));
        }catch(Exception e) {
            this.setErrorResponse(response,e.getMessage());
            return  false;
        }
        return  true;
    }
    protected void setErrorResponse(HttpServletResponse response,String message) throws IOException {
        response.setHeader("Content-type", "text/html;charset=UTF-8");
        response.setCharacterEncoding("UTF-8");
        response.getWriter().write(message);
        response.getWriter().flush();
        response.getWriter().close();
        
    }
}

4.配置拦截器
springmvc-xml