引入依赖
<dependency><groupId>com.auth0</groupId><artifactId>java-jwt</artifactId><version>4.2.1</version>
</dependency>生成和解析token
@SpringBootTest
class DemoApplicationTests {@Test//生成jwt令牌void genToken() {JWTCreator.Builder builder = JWT.create();Map<String, Object> headers=new HashMap<>();headers.put("typ","jwt");headers.put("alg","hs256");Map<String, Object> claims=new HashMap<>();claims.put("id",1);claims.put("username","张三");String token=builder.withHeader(headers).withClaim("user",claims).withExpiresAt(new Date(System.currentTimeMillis()+1000*60*60*12))//设置失效日期，12小时后过期.sign(Algorithm.HMAC256("mykey"));//加密时所用的密钥System.out.println(token);}//解析并验证jwt令牌，验证不通过则抛出异常@Testvoid parseToken(){//将genToken打印的字符串复制到这里String token="*****.*****.******";JWTVerifier verifier = JWT.require(Algorithm.HMAC256("mykey"))//算法HMAC256要与上面的相同，mykey也要一样.build();DecodedJWT decodedJWT = verifier.verify(token);//验证tokenMap<String, Object> user = decodedJWT.getClaim("user").asMap();//将放入token的键为user的数据取出来System.out.println(user.get("username"));}
}