package com.hxzkmonitor.util;
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import io.jsonwebtoken.Claims;
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import io.jsonwebtoken.JwtBuilder;
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import io.jsonwebtoken.Jwts;
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import io.jsonwebtoken.SignatureAlgorithm;
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import org.bouncycastle.util.encoders.Base64;
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import javax.crypto.SecretKey;
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import javax.crypto.spec.SecretKeySpec;
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import java.util.Date;
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/**
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*
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* jwt工具类
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*
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**/
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public class JwtUtil {
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/**
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* 签发JWT
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* @param subject 可以是JSON数据 尽可能少
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* @param ttlMillis token有效时间
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* @return String
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*
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*/
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public static String createJWT(String subject, long ttlMillis) {
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SignatureAlgorithm signatureAlgorithm = SignatureAlgorithm.HS256;
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long nowMillis = System.currentTimeMillis();
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Date now = new Date(nowMillis);
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SecretKey secretKey = generalKey();
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JwtBuilder builder = Jwts.builder()
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// .setId(IdUtils.simpleUUID()) //唯一性
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.setSubject(subject) // 主题
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.setIssuer("admin") // 签发者
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.setIssuedAt(now) // 签发时间
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.signWith(signatureAlgorithm, secretKey); // 签名算法以及密匙
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if (ttlMillis >= 0) {
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long expMillis = nowMillis + ttlMillis;
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Date expDate = new Date(expMillis);
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builder.setExpiration(expDate); // 过期时间
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}
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return builder.compact();
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}
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/**
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* 密钥
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* @return
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*/
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public static SecretKey generalKey() {
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byte[] encodedKey = Base64.decode("xxxxxxxx"); //自定义密钥, 不能外泄
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SecretKey key = new SecretKeySpec(encodedKey, 0, encodedKey.length, "AES");
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return key;
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}
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/**
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*
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* 解析JWT字符串
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* @param jwt
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* @return
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* @throws Exception
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*/
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public static Claims parseJWT(String jwt) throws Exception {
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SecretKey secretKey = generalKey();
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return Jwts.parser()
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.setSigningKey(secretKey)
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.parseClaimsJws(jwt)
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.getBody();
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}
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/**
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* 获取用户
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* @param token
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* @return
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* @throws Exception
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*/
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// public synchronized static WxUser getUser(String token) {
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// WxUser user = null;
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// String subject = null;
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// try {
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// subject = parseJWT(token).getSubject();
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// } catch (Exception e) {
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// e.printStackTrace();
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// }
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// WxUser userModel = JsonListUtil.jsonToBean(subject, WxUser.class);
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// if (ObjectUtil.isNotEmpty(userModel)) {
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// user = SpringUtil.getBean(WxUserMapper.class).selectWxUserById(userModel.getId());
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// }
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// return user;
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// }
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}
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