package com.mes.common.utils;
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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 javax.crypto.SecretKey;
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import javax.crypto.spec.SecretKeySpec;
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import java.util.Base64;
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import java.util.Date;
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import java.util.UUID;
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/**
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* @Author : zhoush
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* @Date: 2024/4/9 19:15
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* @Description:
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*/
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public class JwtUtil {
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//有效期为
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public static final Long JWT_TTL = 60 * 60 * 1000L;// 60 * 60 *1000 一个小时
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//设置秘钥明文
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public static final String JWT_KEY = "sangeng";
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public static String getUUID() {
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String token = UUID.randomUUID().toString().replaceAll("-", "");
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return token;
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}
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/**
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* 生成jtw
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*
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* @param subject token中要存放的数据（json格式）
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* @return
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*/
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public static String createJWT(String subject) {
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JwtBuilder builder = getJwtBuilder(subject, null, getUUID());// 设置过期时间
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return builder.compact();
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}
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/**
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* 生成jtw
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*
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* @param subject token中要存放的数据（json格式）
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* @param ttlMillis token超时时间
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* @return
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*/
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public static String createJWT(String subject, Long ttlMillis) {
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JwtBuilder builder = getJwtBuilder(subject, ttlMillis, getUUID());// 设置过期时间
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return builder.compact();
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}
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private static JwtBuilder getJwtBuilder(String subject, Long ttlMillis, String uuid) {
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SignatureAlgorithm signatureAlgorithm = SignatureAlgorithm.HS256;
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SecretKey secretKey = generalKey();
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long nowMillis = System.currentTimeMillis();
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Date now = new Date(nowMillis);
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if (ttlMillis == null) {
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ttlMillis = JwtUtil.JWT_TTL;
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}
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long expMillis = nowMillis + ttlMillis;
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Date expDate = new Date(expMillis);
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return Jwts.builder()
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.setId(uuid) //唯一的ID
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.setSubject(subject) // 主题 可以是JSON数据
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.setIssuer("sg") // 签发者
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.setIssuedAt(now) // 签发时间
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.signWith(signatureAlgorithm, secretKey) //使用HS256对称加密算法签名, 第二个参数为秘钥
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.setExpiration(expDate);
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}
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/**
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* 创建token
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*
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* @param id
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* @param subject
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* @param ttlMillis
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* @return
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*/
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public static String createJWT(String id, String subject, Long ttlMillis) {
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JwtBuilder builder = getJwtBuilder(subject, ttlMillis, id);// 设置过期时间
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return builder.compact();
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}
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public static void main(String[] args) throws Exception {
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String token = "eyJhbGciOiJIUzI1NiJ9.eyJqdGkiOiJjYWM2ZDVhZi1mNjVlLTQ0MDAtYjcxMi0zYWEwOGIyOTIwYjQiLCJzdWIiOiJzZyIsImlzcyI6InNnIiwiaWF0IjoxNjM4MTA2NzEyLCJleHAiOjE2MzgxMTAzMTJ9.JVsSbkP94wuczb4QryQbAke3ysBDIL5ou8fWsbt_ebg";
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Claims claims = parseJWT(token);
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System.out.println(claims);
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}
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/**
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* 生成加密后的秘钥 secretKey
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*
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* @return
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*/
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public static SecretKey generalKey() {
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byte[] encodedKey = Base64.getDecoder().decode(JwtUtil.JWT_KEY);
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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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* 解析
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*
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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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