JWT使用方法

jwt是什么？也是一种加密的方式，生成token,解析token

1.maven地址：

<dependency>
    <groupId>io.jsonwebtoken</groupId>
    <artifactId>jjwt</artifactId>
    <version>0.9.1</version>
</dependency>

2.代码demo

package pttl.order.utils;

import cn.hutool.core.collection.CollUtil;
import io.jsonwebtoken.*;
import org.springframework.stereotype.Component;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;

@Component
public class JwtUtil {

   // @Value("${jwt.secretKey}")
    private static String secretKey = "ak47";

    /**
     *
     * @param id
     * @param subject 主题
     * @param ttlMillis 过期时间-(毫秒)
     * @param map 数据
     * @return
     * @throws Exception
     */
    public static String createJWT(String id, String subject, long ttlMillis, Map<String, Object> map) throws Exception {
        JwtBuilder builder = Jwts.builder()
                .setId(id)
                .setSubject(subject) // 发行者
                .setIssuedAt(new Date()) // 发行时间
                .signWith(SignatureAlgorithm.HS256, secretKey) // 签名类型 与 密钥
                .compressWith(CompressionCodecs.DEFLATE);// 对载荷进行压缩
        if (!CollUtil.isEmpty(map)) {
            builder.setClaims(map);
        }
        if (ttlMillis > 0) {
            builder.setExpiration(new Date(System.currentTimeMillis() + ttlMillis));
        }
        return builder.compact();
    }

    public static Claims parseJWT(String jwtString) {
        return Jwts.parser().setSigningKey(secretKey)
                .parseClaimsJws(jwtString)
                .getBody();
    }

    public static void main(String[] args) throws Exception {
        Map<String, Object> map = new HashMap<>();
        map.put("name","孙悟空");
        String login = createJWT(UUID.randomUUID().toString(), "login", 30000, map);
        System.out.println(login);
        Claims claims = parseJWT(login);
        String name = claims.get("name", String.class);
        System.out.println(name);
    }
}