导入依赖

<dependency><groupId>io.jsonwebtoken</groupId><artifactId>jjwt</artifactId><version>0.9.1</version>
</dependency>
<dependency><groupId>javax.xml.bind</groupId><artifactId>jaxb-api</artifactId>
</dependency>

yml配置

jwt:token:tokenExpiration: 120 #有效时间,单位分钟tokenSignKey: $_$112233445566 #当前程序签名秘钥 自定义

 工具类

import io.jsonwebtoken.*;
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;import java.util.Date;@Data
@Component
@ConfigurationProperties(prefix = "jwt.token")
public class JwtUtil {private  long tokenExpiration; //有效时间,单位毫秒 1000毫秒 == 1秒private  String tokenSignKey;  //当前程序签名秘钥//生成token字符串public  String createToken(String userId) {String token = Jwts.builder().setSubject("YYGH-USER").setExpiration(new Date(System.currentTimeMillis() + tokenExpiration*1000*60)) //单位分钟.claim("userId", userId).signWith(SignatureAlgorithm.HS512, tokenSignKey).compressWith(CompressionCodecs.GZIP).compact();return token;}//从token字符串获取useridpublic  String getUserId(String token) {if(StringUtils.isEmpty(token)) {return null;}Jws<Claims> claimsJws = Jwts.parser().setSigningKey(tokenSignKey).parseClaimsJws(token);Claims claims = claimsJws.getBody();String userId = (String)claims.get("userId");return userId;}//判断token是否有效public  boolean isExpiration(String token){try {boolean isExpire = Jwts.parser().setSigningKey(tokenSignKey).parseClaimsJws(token).getBody().getExpiration().before(new Date());//没有过期，有效，返回falsereturn isExpire;}catch(Exception e) {//过期出现异常，返回truereturn true;}}
}