{
	"typ": "JWT", // TOKEN TYPE ,token類型
	"alg": "HS256"  //ALGORITHM，算法 哈希256
}

{
"uid": "1234567890" // 自定義數(shù)據(jù)
}

<!-- jwt -->
<dependency>
    <groupId>com.auth0</groupId>
    <artifactId>java-jwt</artifactId>
    <version>3.8.1</version>
</dependency>

coisini:
  security:
    jwt-key: coisini
    # 過期時(shí)間
    token-expired-in: 86400000

import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.exceptions.JWTVerificationException;
import com.auth0.jwt.interfaces.Claim;
import com.auth0.jwt.interfaces.DecodedJWT;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import java.util.*;

/**
 * @Description JWT工具類
 * @author coisini
 * @date Aug 18, 2021
 * @Version 1.0
 */
@Component
public class JwtUtil {

    /**
     * key
     */
    private static String jwtKey;

    /**
     * 過期時(shí)間
     */
    private static Integer expiredTimeIn;

    /**
     * JWT KEY
     * @param jwtKey
     */
    @Value("${coisini.security.jwt-key}")
    public void setJwtKey(String jwtKey) {
        JwtUtil.jwtKey = jwtKey;
    }

    /**
     * 過期時(shí)間
     * @param expiredTimeIn
     */
    @Value("${coisini.security.token-expired-in}")
    public void setExpiredTimeIn(Integer expiredTimeIn) {
        JwtUtil.expiredTimeIn = expiredTimeIn;
    }

    /**
     * 生成令牌
     * @param uid 用戶id
     * @return
     */
    public static String makeToken(Long uid) {
        return JwtUtil.getToken(uid);
    }

    /**
     * 獲取令牌
     * @param uid 用戶id
     * @param scope 權(quán)限分級(jí)數(shù)字
     * @return
     */
    private static String getToken(Long uid) {
        // 指定算法
        Algorithm algorithm = Algorithm.HMAC256(JwtUtil.jwtKey);

        Map<String, Date> dateMap = JwtUtil.calculateExpiredIssues();

        /**
         * withClaim(） 寫入自定義數(shù)據(jù)
         * withExpiresAt() 設(shè)置過期時(shí)間
         * withIssuedAt() 設(shè)置當(dāng)前時(shí)間
         * sign() 簽名算法
         */
        return JWT.create()
                    .withClaim("uid", uid)
                    .withExpiresAt(dateMap.get("expiredTime"))
                    .withIssuedAt(dateMap.get("now"))
                    .sign(algorithm);
    }

    /**
     * 獲取自定義數(shù)據(jù)
     * @param token
     * @return
     */
    public static Optional<Map<String, Claim>> getClaims(String token) {
        DecodedJWT decodedJWT;

        // 指定算法
        Algorithm algorithm = Algorithm.HMAC256(JwtUtil.jwtKey);
        JWTVerifier jwtVerifier = JWT.require(algorithm).build();

        try {
            decodedJWT = jwtVerifier.verify(token);
        } catch (JWTVerificationException e) {
            return Optional.empty();
        }

        return Optional.of(decodedJWT.getClaims());
    }

    /**
     * 驗(yàn)證Token
     * @param token
     * @return
     */
    public static boolean verifyToken(String token) {
        try {
            Algorithm algorithm = Algorithm.HMAC256(JwtUtil.jwtKey);
            JWTVerifier jwtVerifier = JWT.require(algorithm).build();
            jwtVerifier.verify(token);
        } catch (JWTVerificationException e) {
            return false;
        }

        return true;
    }

    /**
     * 計(jì)算過期時(shí)間
     * @return
     */
    private static Map<String, Date> calculateExpiredIssues() {
        Map<String, Date> map = new HashMap<>();
        Calendar calendar = Calendar.getInstance();
        Date now = calendar.getTime();
        calendar.add(Calendar.SECOND, JwtUtil.expiredTimeIn);
        // 當(dāng)前時(shí)間
        map.put("now", now);
        // 過期時(shí)間
        map.put("expiredTime", calendar.getTime());
        return map;
    }
}

@RestController
@RequestMapping("/jwt")
public class JwtController {

    /**
     * 獲取Token
     * @param id
     * @return
     */
    @GetMapping(value = "/get")
    public String getToken(@RequestParam Long id) {
        return JwtUtil.makeToken(id);
    }

    /**
     * 驗(yàn)證Token
     * @param token
     * @return
     */
    @PostMapping("/verify")
    public Map<String, Boolean> verify(@RequestParam String token) {
        Map<String, Boolean> map = new HashMap<>();
        Boolean valid = JwtUtil.verifyToken(token);
        map.put("is_valid", valid);
        return map;
    }

}