jwt看这一段就够用了

package com.gzz.jwt;

import java.util.Base64;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.JwtBuilder;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;

public class TestJwt {
    private static Logger logger = LoggerFactory.getLogger(TestJwt.class);

    private static Long timeLimit = 1000 * 60 * 60 * 24l;// 1天
    public static final String PRIVATEKEY = "privateKey";// 私钥

    public static void main(String[] args) {
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("userName", "张三");
        String userid = "01";
        String subject = "subject";
        
        
        String token = TestJwt.createToken(userid, subject, map);
        logger.info(token);
        Claims parseJWT = TestJwt.parseToken(token);

        for (Entry<String, Object> entry : parseJWT.entrySet()) {
            logger.info("key={},value={}", entry.getKey(), entry.getValue());
        }

    }

    public static String createToken(String userid, String subject, Map<String, Object> map) {
        SignatureAlgorithm signature = SignatureAlgorithm.HS256;
        Date now = new Date();
        long expMillis = now.getTime() + timeLimit;
        Date expDate = new Date(expMillis);

        JwtBuilder builder = Jwts.builder().setId(userid)// UUID
                .setSubject(subject) // 主题
                .setIssuer("Java1234") // 签发者
                .setIssuedAt(now) // 签发时间
                .signWith(signature, generalKey()) // 签名算法以及密匙
                .setExpiration(expDate); // 过期时间
        for (String key : map.keySet()) {
            builder.claim(key, map.get(key));
        }
        return builder.compact();
    }

    private static SecretKey generalKey() {
        byte[] encodedKey = Base64.getDecoder().decode(PRIVATEKEY);
        SecretKey key = new SecretKeySpec(encodedKey, 0, encodedKey.length, "AES");
        return key;
    }

    public static Claims parseToken(String jwt) {
        Claims claims = Jwts.parser().setSigningKey(generalKey()).parseClaimsJws(jwt).getBody();
        return claims;
    }

}