JWT 生成token

创建一个springboot项目

导包

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

创建 一个jwt工具类

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import io.jsonwebtoken.Claims; import io.jsonwebtoken.Jwts; import io.jsonwebtoken.SignatureAlgorithm;   import java.util.Date;   /**  * @Author: xhj  * @Date: 2023/10/19/21:13  * @Description:  */ public class JwtUtil {       /**      * 定义过期时间      */     private static final long EXPIRATION_TIME = 86400000L;       /**      * 生成token      * @param subject      * @return      */     public static String generateToken(String subject,String secretKey){ //secretKey 密钥         return Jwts.builder()                 .setSubject(subject)  //表示JWT的主题，通常用于标识请求的发起者或用户                 .setIssuedAt(new Date())  //设置JWT的发行时间为当前时间                 .setExpiration(new Date(System.currentTimeMillis()+EXPIRATION_TIME)) //设置JWT的过期时间为当前时间加上预定义的EXPIRATION_TIME                 .signWith(SignatureAlgorithm.HS512,secretKey)  //使用HS512算法和传入的secretKey对JWT进行签名，以确保其安全性                 .compact();  //将JWT对象转换为紧凑的字符串表示形式     }     /**      * 解析token,获取用户名      * @param token      * @return      */     public static String getSubjectFromToken(String token,String secretKey){         Claims claims = Jwts.parser()                 .setSigningKey(secretKey)  //secretKey 密钥                 .parseClaimsJws(token) //生成的token                 .getBody();         return claims.getSubject();     }   }

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1	创建一个controller类

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import com.xhj.auth.util.JwtUtil; import lombok.RequiredArgsConstructor; import org.springframework.beans.factory.annotation.Value; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController;   import javax.servlet.http.Cookie; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;   /**  * @Author: xhj  * @Date: 2023/10/19/20:44  * @Description:  */ @RestController @RequiredArgsConstructor @RequestMapping("/token") public class TokenController {       /**      * 获取密钥      */     @Value("${name}")     private String SECRET_KEY;       /**      * 生成token      * @param request      * @param response      * @return      */     @GetMapping("/getToken")     public String token(HttpServletRequest request,HttpServletResponse response){         // 生成token         String token = JwtUtil.generateToken("xhj",SECRET_KEY);         // 放入session         request.getSession().setAttribute("token",token); //        Cookie cookie = new Cookie("token",token); //        response.addCookie(cookie);         return token;     }       /**      * 解析token 获取用户名      * @param request      * @return      */     @GetMapping("/analyzeToken")     public String analyzeToken(HttpServletRequest request){         String name = null;         String token = (String) request.getSession().getAttribute("token");         if (token!=null){             name = JwtUtil.getSubjectFromToken(token,SECRET_KEY);         }         return name;     }   }