Jwt工具类

在开发中，我们可能会用到JWT去做编码与解码问题，下面就是简单的jwt相关编解码工具类。

1. 引入jwt依赖

   compile group: 'io.jsonwebtoken', name: 'jjwt', version: '0.9.1'
   

2. demo工具

   @Slf4j
   public class JwtUtil {
   
       public static String encode(String key, Map param, String salt){
           if(salt!=null){
               key+=salt;
           }
           JwtBuilder jwtBuilder = Jwts.builder().signWith(SignatureAlgorithm.HS256,key);
   
           jwtBuilder = jwtBuilder.setClaims(param);
   
           String token = jwtBuilder.compact();
           return token;
   
       }
   
   
       public  static Map decode(String token , String key, String salt){
           Claims claims=null;
           if (salt!=null){
               key+=salt;
           }
           try {
               claims= Jwts.parser().setSigningKey(key).parseClaimsJws(token).getBody();
           } catch ( JwtException e) {
               log.error("JWT解码出现异常，e:", e);
               return null;
           }
           return  claims;
       }
   
       public static void main(String[] args) {
           String key = "token_key";
           String ip="192.168.1.1";
           Map map = new HashMap();
           map.put("userId","1001");
           map.put("nickName","tony");
           String token = JwtUtil.encode(key, map, ip);
           Map decode = JwtUtil.decode(token, key, "192.168.1.1");
           System.out.println(token);
           System.out.println(decode);
   
       }
   }