依赖
<dependency><groupId>io.jsonwebtoken</groupId><artifactId>jjwt</artifactId><version>0.9.1</version></dependency>
JwtUtil.java
package com.nnutc.common.utils;import io.jsonwebtoken.Claims;
import io.jsonwebtoken.JwtBuilder;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;import java.util.Date;
import java.util.HashMap;
import java.util.Map;public class JwtUtil {private static final String SECRET_KEY = "1ost"; private static final long EXPIRATION_TIME = 3600000; public static String generateToken(String subject) {Map<String, Object> claims = new HashMap<>();JwtBuilder builder = Jwts.builder().setClaims(claims).setSubject(subject).setIssuedAt(new Date(System.currentTimeMillis())).setExpiration(new Date(System.currentTimeMillis() + EXPIRATION_TIME)).signWith(SignatureAlgorithm.HS512, SECRET_KEY);return builder.compact();}public static boolean validateToken(String token) {try {Jwts.parser().setSigningKey(SECRET_KEY).parseClaimsJws(token);return true;} catch (Exception e) {return false;}}public static String getSubjectFromToken(String token) {Claims claims = Jwts.parser().setSigningKey(SECRET_KEY).parseClaimsJws(token).getBody();return claims.getSubject();}
}