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导入坐标

<dependency>
    <groupId>io.jsonwebtoken</groupId>
    <artifactId>jjwt</artifactId>
    <version>0.9.1</version>
</dependency>

生成token

@Test
    public void test2(){
        //添加构成JWT的参数
        Map<String, Object> headMap = new HashMap();
        headMap.put("alg", SignatureAlgorithm.HS256.getValue());//使用HS256签名算法
        headMap.put("typ", "JWT");

        Map body = new HashMap();
        body.put("userId","1");
        body.put("username","xiaoming");
        body.put("role","admin");

        String jwt = Jwts.builder()
                        .setHeader(headMap)
                        .setClaims(body)
                        .setId("jwt001")
            			.signWith(SignatureAlgorithm.HS256,"smallmq")
            			.compact();
        System.out.println(jwt);

        //解析jwt
        Jwt result = Jwts.parser().setSigningKey("smallmq").parse(jwt);
        Object jwtBody = result.getBody();
        Header header = result.getHeader();

        System.out.println(result);
        System.out.println(jwtBody);
        System.out.println(header);
    }